不断更新--Java技巧篇

1.Spring xml配置 添加的 命名空间的键值对 2.hibernate映射文件点击对应实体生成相应的xml映射文件3.Alt+shift +z 对代码块快速 try catch或do while 4.快速模板配置 如: struts2的核心配置.....5. 几个重要的开源软件, httpunit ,httpclient(对于QQ这种提交一个页面跳转好几个页面的怎么登陆) 6. 比如 Apache Jakarta 上很著名的另外两个开源项目 Cactus 和 HTMLUnit 都使用了 HttpClient，7.个人常用文件上传软件，如手机和电脑的互传.8.  //      File file = new File("E:/itext/b.pdf");//      file.getParentFile().mkdirs();9. html 转换为PDF 10.jsoup 也有一个高级作用可以直接过滤所有的html标签，只留下txt文本Elements elements2 = docum.select("#article_content");String content  = elements2.text();Elements elements2 = docum.select("#article_content");String content  = elements2.outerHtml();  //包含  #article_content在内的divString content  = elements2.html();  //#article_content里面的内容10.// 从classpath的根目录中查找a.txt文件this.getClass().getClassLoader().getResourceAsStream("a.txt");// 从classpath的根目录中查找a.txt文件this.getClass().getResourceAsStream("/a.txt");// 从当前类所在的包中查找a.txt文件this.getClass().getResourceAsStream("a.txt");11.动态加载Android布局View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.tab1,null); 由于这个view 没有父布局，故 参数2为 null;12. 多线程下载库，httpunit，压缩解压工具13.图片轮播的小点   ImageView imageView;   ImageView imageviews = new ImageView[advPic.size];  //advPic(ImageView) 是轮播中的图片共4张    for(int i=0;i<4;i++){        imageView = new ImageView(this);        imageView.setLayoutParams(new LayoutParams(20,20));  //设置imageView的宽和高         imageView.setPadding(5,5,5,5); // 设置上下左右的间距         imageviews[i] = imageView;        if(i==0){            imageviews[i].setBackgourndResource(R.drawable.banner_focus);         }        else{            imageviews[i].setBackgourndResource(R.drawable.banner_blur);        }   }14. 切换轮播是通过 Thread.sleep(3000);  休眠时间设置的 15.this.adapter.notifyDataSetChanged();  //更新listView的List<CollectListModel> mcList ;private MyCollectAdapter adapter;protected void onCreate(Bundle saveInstanceState){    super.onCreate(saveInstanceState);    setContentView(R.layout.activity_main);    ListViewCollect mListview = (ListViewCollect)findViewById(R.id.list_del);    mcList = new ArrayList<CollectListModel>();    adapter = new MyColloectAdapter(this.mcList);    mListview.setAdapter(adapter);    setList();}public void setList(){    for(int i=0;i<10;i++){        CollectListModel m = new CollectListModel();        mcList.add(m);    }    adapter.notifyDataSetChanged();  //更新listView}16.类似QQ谈话面板用的是 ListView Adapter使用的是BaseAdapter public View getView(int paramInt, View paramView, ViewGroup paramViewGroup)  {    LayoutInflater localLayoutInflater = LayoutInflater.from(this.context);    if (((TextObject)this.lists.get(paramInt)).getFlag() == 0)   // public static final int reciveFlag = 0;      this.layout = ((RelativeLayout)localLayoutInflater.inflate(R.layout.left, null));    if (((TextObject)this.lists.get(paramInt)).getFlag() == 1)   //Const.java中  public static final int sendFlag = 1;      this.layout = ((RelativeLayout)localLayoutInflater.inflate(R.layout.right, null));    TextView localTextView1 = (TextView)this.layout.findViewById(2131296261);    TextView localTextView2 = (TextView)this.layout.findViewById(2131296259);    localTextView1.setText(((TextObject)this.lists.get(paramInt)).getText().replace("<br>", "\n"));    localTextView2.setText(((TextObject)this.lists.get(paramInt)).getTime());    return this.layout;  }布局 接受者 left.xml<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent"  xmlns:android="http://schemas.android.com/apk/res/android">    <TextView android:gravity="center_horizontal" android:id="@id/time" android:layout_width="fill_parent" android:layout_height="fill_parent" />    <ImageView android:id="@id/iv" android:padding="10.0dip" android:layout_width="70.0dip" android:layout_height="70.0dip" android:src="@drawable/robot" android:layout_below="@id/time" />    <TextView android:id="@id/tv" android:background="@drawable/receive" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="50.0dip" android:layout_toRightOf="@id/iv" android:layout_below="@id/time" /></RelativeLayout>发送者 right.xml <?xml version="1.0" encoding="utf-8"?><RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent"  xmlns:android="http://schemas.android.com/apk/res/android">    <TextView android:gravity="center_horizontal" android:id="@id/time" android:layout_width="fill_parent" android:layout_height="fill_parent" />    <ImageView android:id="@id/iv" android:padding="10.0dip" android:layout_width="70.0dip" android:layout_height="70.0dip" android:src="@drawable/user" android:layout_below="@id/time" android:layout_alignParentRight="true" />    <TextView android:id="@id/tv" android:background="@drawable/send" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="50.0dip" android:layout_toLeftOf="@id/iv" android:layout_below="@id/time" /></RelativeLayout> 17.Android 里面比较常用的 获取文件类一般手机SD卡只有一个 ，现在多数有两个SD卡/mnt/sdcard  /mnt/sdcard2        File sdCardDir = Environment.getExternalStorageDirectory();//   /mnt/sdcard        Environment.getDataDirectory()        Environment.getRootDirectory()        Environment.getDownloadCacheDirectory()18. 获取手机ROM容量和 手机SD卡的容量        File sdCardDir = new File("/mnt/sdcard2");//   /mnt/sdcard        StatFs statFs = new StatFs(sdCardDir.getPath());        long blockCount = statFs.getBlockCount();        long blockSize = statFs.getBlockSize();        long availableBlocks = statFs.getAvailableBlocks();总容量 String totalSize = Formatter.formatFileSize(getApplicationContext(), blockCount*blockSize);可用容量String availableSize = Formatter.formatFileSize(getApplicationContext(), blockSize*availableBlocks);//------------        File path = Environment.getDataDirectory();        StatFs statFs = new StatFs(path.getPath());        long blockCount = statFs.getBlockCount();        long blockSize = statFs.getBlockSize();        long availableBlocks = statFs.getAvailableBlocks();        String totalSize = Formatter.formatFileSize(getApplicationContext(), blockCount*blockSize);        String availableSize = Formatter.formatFileSize(getApplicationContext(), blockSize*availableBlocks);        return "手机Rom总容量:"+totalSize+"\n手机Rom可用容量:"+availableSize;19.在使用 android:layout_weight="1.0" 尤其是LinearLayout  android:orientation="horizontal"水平方向时候其里面的  控件 可以设置 android:layout_width="0.0dip" 为 0 ,由 android:layout_weight="1.0"控制  <EditText        android:id="@+id/send"       android:background="@drawable/edittext_active"        android:layout_width="0.0dip"        android:layout_height="wrap_content"       android:layout_weight="1.0"        />      20. 布局  android:layout_weight="1.0" 设置时候，发现，如果只有一方设置，另一方没有设置的情况下在另一方占 一定位置，剩下的全部 留给被设置的 一方21. 图灵机器人package com.example.robot.Utils;import android.os.AsyncTask;import com.example.robot.Interface.HttpGetUrlDataListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;public class HttpGetRequest extends AsyncTask<String, Void, String>{  private String content;  private HttpEntity entity;  private HttpClient httpCilent;  private HttpGet httpGet;  private HttpGetUrlDataListener httpGetUrlDataListener;  private HttpResponse httpResponse;  private String url = "http://www.tuling123.com/openapi/api?key=c3dbedaa570141b3b0ef68c4e7fdf8ce&info=";  public HttpGetRequest(String paramString, HttpGetUrlDataListener paramHttpGetUrlDataListener)  {    this.content = paramString;    this.httpGetUrlDataListener = paramHttpGetUrlDataListener;  }  protected String doInBackground(String[] paramArrayOfString)  {    String str = null;    try    {      this.httpCilent = new DefaultHttpClient();      this.httpGet = new HttpGet(this.url + this.content);      this.httpResponse = this.httpCilent.execute(this.httpGet);      this.entity = this.httpResponse.getEntity();      BufferedReader localBufferedReader = new BufferedReader(new InputStreamReader(this.entity.getContent()));      StringBuffer localStringBuffer = new StringBuffer();      str = localBufferedReader.readLine();      if (str == null)        return localStringBuffer.toString();      label145: localStringBuffer.append(str);    }    catch (ClientProtocolException localClientProtocolException)    {      localClientProtocolException.printStackTrace();      return str;    }    catch (IOException localIOException)    {      localIOException.printStackTrace();      break label145:    }  }  protected void onPostExecute(String paramString)  {    this.httpGetUrlDataListener.getUrlData(paramString);    super.onPostExecute(paramString);  }}22.    <android.support.v4.view.ViewPager        android:id="@+id/vPager"        android:layout_width="fill_parent"        android:layout_height="fill_parent"         />    <LinearLayout                                 //里面是四个 欢迎的圆点        android:id="@+id/ll"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="5.0dp"          //通过margin 使圆点向上移动了        android:orientation="horizontal" >23. 解释 android:layout_gravity 和 android:gravity区别LinearLayout有"两个"  24.例子1:requestWindowFeature(Window.FEATRUE_NO_TITLE); //等价于满屏(没有图标和标题)getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.main);例子2:requestWindowFeature(Window.FEATURE_LEFT_ICON); //等价于满屏(没有图标和标题)setContentView(R.layout.main);getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,R.drawable.ic_launcher);  //设置 左边图标的 图片 例子3:requestWindowFeature(Window.FEATURE_RIGHT_ICON); setContentView(R.layout.main);getWindow().setFeatureDrawableResource(Window.FEATURE_RIGHT_ICON,R.drawable.ic_launcher);  //设置 right 图标的 图片 25.Android好看的按钮制作，可以使用图片(默认，单击，聚焦，样式都不同)，方法: 在res/drawable/下面 放置一个xml文件名字随意但是需要使用selector 标签<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_enabled="true"        android:drawable="@drawable/dark_dot" />    <item        android:drawable="@drawable/white_dot" /></selector><?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_pressed="true"                  //点击状态        android:drawable="@drawable/pressed" />     <item android:state_focused="true"              //获得焦点状态        android:drawable="@drawable/focused" />      <item android:drawable="@drawable/focused" /> //默认状态</selector>26.button.layout(l, t, r, b); 可以直接给某个空间布局位置27. Pending  直到，即将发生的，待定的PendingIntent28.@Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        // TODO Auto-generated method stub        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {        case 10086:            Uri result = data.getData();            String contactId = result.getLastPathSegment(); //得到uri中的最后一个占位符 如 localhost/dedecms/java/1通过startActivityForResult获取 联系人的方法public void getList(View view){        //获取联系人列表        Intent intent = new Intent();        intent.setAction(Intent.ACTION_PICK);        intent.setData(ContactsContract.Contacts.CONTENT_URI);        startActivityForResult(intent, 10086); //10086 是请求码    }   29.ArrayList和 数组的互转 ArrayList<String> list = new ArrayList<String>();String[] strs = new String[list.size];list.toArray(strs);String []strs = {"a","b","c"};List list = Arrays.asList(strs);30.BitmapFactory 工具类可以直接把R.drawable里面图片转换为bitmap也可以把assets里面图片转为bitmap类型31.SMS发短信实例:public void send(View view){        String message = editText.getText().toString();        //scAddress 服务中心的地址    null(默认为SMSC 3) destinationPort消息的目标端口号        //sentIntent 短息发送成功或失败   后才 调用此Activity  ,ResultCode是  Activity.RESULT_OK表示成功,(RESULT_ERROR_GENERIC_FAILURE,RESULT_ERROR_RADIO_OFF,RESULT_ERROR_NULL_PDU)之一表示错误        //deliveryIntent 短息接收成功  后才调用此Activity        Intent send = new Intent();        send.setClass(MainActivity.this, ShowActivity.class);        PendingIntent sentIntent = PendingIntent.getActivity(MainActivity.this, 1, send, PendingIntent.FLAG_UPDATE_CURRENT);        Intent receiver = new Intent();        receiver.setClass(MainActivity.this, ShowActivity2.class);        PendingIntent deliveryIntent = PendingIntent.getActivity(getApplicationContext(), 2, receiver, PendingIntent.FLAG_UPDATE_CURRENT);        smsManager.sendTextMessage("10086", null, message, sentIntent, deliveryIntent);    }注意权限需要:    <uses-permission android:name="android.permission.SEND_SMS"/>           <uses-permission android:name="android.permission.READ_PHONE_STATE"/>32.无需权限，感觉Android5.0 改了很多，关闭应用，这个全局定时器也无效了;public class MainActivity extends Activity  {    //全局定时器    AlarmManager alarmManager = null;    PendingIntent pendingIntent = null;//  PendingIntent 可以脱离应用程序而存在，系统级别的    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Intent intent = new Intent();        intent.setClass(this, Result.class);        alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);        pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);    }       public void start(View view ){        //开启全局定时器        alarmManager.setRepeating(AlarmManager.RTC, 0, 5000, pendingIntent);    }    public void end(View view ){        alarmManager.cancel(pendingIntent);    }33.PackageManager manager = getPackageManager();这个类很好，可以获取 手机已经安装的应用的图标等等信息    String packageName = "com.gs.file";    List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);    for(int i=0;i<pinfo.size();i++){        PackageInfo p = pinfo.get(i);        String label = packageManager.getApplicationLabel(p.applicationInfo).toString();  //应用程序的名字        if(packageName.equals(label)){            Intent intent = new Intent();            intent = packageManager.getLaunchIntentForPackage(packageName);            startActivity(intent);        }    }    获取某个应用的Intent    Intent intent = manager.getLaunchIntentForPackage(pName);34.JavaScript解析Json<script type="text/javascript">        function getJson(){            $.ajax({                type:"post",                url:"testJson",                data:{"time":Math.random()},                success:function(data){                    var musers = eval("("+data+")");  //{"users":[{"name":"王立","password":1234},{"name":"张华天","password":124551}]} "users"是musers的一个属性，注意  和 [{"name":"王立","password":1234},{"name":"张华天","password":124551}]是不同的                    var array = musers.users;                    //alert(array);                    for(var key in array){     // for(var i=0;i<array.length;i++)                        alert(array[key].name);   // array[key]是每一个对象Object{"name":"王立","password":1234} 此时key表示index   ,如果使用for(var key in array) 遍历{"name":"王立","password":1234}，则key表示对象里面的属性                    }                }            });                             }for(var key in obj){    //注意 key表示 下标(如遍历数组)或 属性(如遍历对象)}35. Properties p = new Properties();p.load(this.getClass().getClassLoader().getResourceAsStream("system.properties"));36. 如果我们希望 某些按钮不显示，可以设置按钮的父容器 不显示 xml属性visiblable=""，当用户触摸屏幕时候显示重写 Activity的onTouchEvent();     public boolean onTouchEvent(MotionEvent event){    if(event.getAction() == MotionEvent.ACTION_DOWN){        btnlayout.setVisibility(ViewGroup.VISIBLE);//ViewGroup.GOON;不可见        reuturn true; //-------------> true Android的事件不再往下 传播  false,事件继续传播    }    return super.onTouchEvent(event);}37.<%@ page import="java.util.Date,java.sql.*" pageEncoding="utf-8" %><html>    <h1>Hello jsp 你好jsp</h1>    <%!        public String info(){            String str = "I love you";            return str;        }    %>    <%=info()%></html>jsp 里面可以直接写方法 <%! 方法体 %> 但是 既然是方法，那么里面就不能直接使用 九大内置对象了，out.write();错误，需要自己创建使用38.google 操作流的 工具包 (简单而强悍，使用nio) CharStreams和ByteStreams com.google.common.collect里还有很多非常有用的工具 BufferedReader buffered = new BufferedReader(reader);  List<String> lines = new ArrayList<String>();  for (;;) {    String line = buffered.readLine();    if (line == null) {      break;    }    lines.add(line);  }  使用Google :1.List<String> lines = CharStreams.readLines(reader);  2.从Readable读取所有内容到一个字符串: String content = CharStreams.toString(reader); 3.用来把整个InputStream的内容全部一次性读到一个byte[]里面.byte[] content = ByteStreams.toByteArray(inputStream)  4.如果你还是需要类似于流一样的操作-比如, 输入的行数太多, 不能一下子都读进来, 那么, 还有一个LineReader可以用. 用起来类似于: Java代码  收藏代码LineReader lineReader = new LineReader(reader);  for (String line = lineReader.readLine(); line != null; line = lineReader.readLine()) {    System.out.println(line);  }  5.用来把所有内容从一个InputStream拷贝到另一个OutputStream. ByteStreams.copy(inputStream, outputStream);39.Guava 中文是石榴的意思，该项目是 Google 的一个开源项目，包含许多 Google 核心的 Java 常用库。目前主要包含：com.google.common.annotationscom.google.common.basecom.google.common.collectcom.google.common.iocom.google.common.netcom.google.common.primitivescom.google.common.util.concurrent40. 几个强大的工具类库 Google的 guava, commons dbutils： JDBC工具类库可以把结果集转换为List  Commons-Compress.jar 文件压缩或解压成tar,zip,bzip2等 Commons-exec : 提供常用方法执行外部进程 httpunit httpclientcommons-io (这里面文件的操作比较方便 )commons-lang   为java.lang提供扩展 ，编程基础类commons-Math  Apache 上 轻量级 数学和统计方法包 包含大多数常用数值算法commons-net 提供FTP等功能，实现了很多 基于Intent协议  支持 ftp/ftps,nntp,smtp,pop3,telnet,tftp,finger,..commons-proxy  封装了java对象代理的一些常用方法commons-validator,jar 验证Email，日期等字符串是否合法dom4j jaxen   xpath库 jsoupjs  用于在java中执行javascript lucene mybatis (前身ibatis)Mina apache Mina(apache 用于开发 高性能的网络应用程序  支持基于NIO ,技术的TCP/UDP 应用 ，串口通讯程序(只在最新预览版中提供))poi  Microsoft office Quartz qrcode  二维码 spring-jdbc Spring 对jdbc的封装 spring-test  Spring对junit的封装 Spring Security   安全认证框架 Spring-module 验证框架 进行表单验证 Html2Image 可以将html存为 GIF ,jpg,png  java-zhconverter  java简体 繁体转换 css Parser css 解析器 commons-tools 时间工具类，数据库连接池工具类，ssh端口映射，文件类，多线程工具类，文件读写，文本关键字查找hutool  也是一个工具类，比commons-tools 依赖更少 ，更多使用功能HttpBuilder 是对httpClient的封装 JCake  ------>字符串处理，日期处理，邮件处理，文件处理，任务调度处理，http请求处理，MD5/AES加密解密处理的一系列工具类Java 反射封装库 Mirror 通用工具类 commonUtils  涵盖 加密，验证，网络，字符串处理，配置，文件处理，异常等工具类 java工具类 FinalGather 日期，字符串，文件，集合，拼音，json，加密，邮件等  控制台输入彩色文字  Jansi  Dao 工具 DaoSupport   对java　ｄａｏ的封装，适合数据库为mysql, 让DaoSupport来帮你管理dao JFinal-commons  是 JFinal2.0 框架的一个基础工具类，集成众多工具， 可以写验证码 JnativeHook   为java程序员提供了全局的键盘和鼠标事件侦听功能 (使用了Jni技术 调用系统方法实现的)验证工具包  mint-validate  轻量级，无第三方依赖， 支持注解java客户库 Google auth library 开源验证客户端库 EasyDBUtils  对DBUtils 的封装 ，简化了事务操作，只需在 业务层接口中需要管理事务 的方法上进行 @StartTransaction 注解即可 部分说明:mint-validate 是一个轻量的 验证工具包，不含源码的jar包 9.4k，含源码的jar包 15k，一共6个java文件，无第三方依赖。validate支持自定义验证规则，并用annotation配置验证规则。它的设计借鉴了javascript 验证工具 的动态性灵活性，并采用java的反射技术实现，所以validate有较强的动态性和灵活性。一个简单实用例子（验证器的定义请参看博文）：package test;import mint.validate.Valid;public class User extends Verifiable{    /*采用正则表达式验证（可配置多个正则表达式）*/    @Valid(tipMsg="邮箱地址不正确", pattern={"^[\\w-]+(\\.[\\w-]+)*@[\\w-]+(\\.[\\w-]+)+$"})    public String email;    /*简单验证器验证*/    @Valid(rule="notnull")    public String username;    /*采用验证器验证，并给验证器传递参数*/    @Valid(rule={"LenLimit"}, params={"6", "32"})    public String password;}实现验证：User u = new User();u.email = "895925636#qq.com";u.password = "passw";/*不写字段名默认验证所有字段，本方法返回一个boolean值，有一个规则验证不通过就返回false，适合在入库前用*/u.validate("email", "password");for(VerificationResult r : u.getValidateResult()){    System.out.println(r);}41.MIME: MIME类型就是设定某种扩展名的文件用一种应用程序 来打开 的方式类型，当该扩展名文件被访问的时候，浏览器 会自动使用指定应用程序来打开。多用于执行一些客户端自定义的文件名，以及一些媒体文件 打开方式 ContentType:text/html;charset=utf-8 浏览器在获取到这种文件时候会自动 调用html解析器对文件进行相应处理 ContentType:text/plain;charset=utf-8  将文件设置为纯文本形式 ，浏览器在获取到这种文件时并不会对其进行处理 42.StringEntity, ByteArrayEntity, InputStreamEntity, and FileEntity.UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, Consts.UTF_8);形式比较单一，只能放入键值对(StringEntity厉害)StringEntity entity = new StringEntity(jsonData.toString(),Consts.UTF_8);File file = new File("somefile.txt");FileEntity entity = new FileEntity(file,ContentType.create("text/plain", "UTF-8"));HttpPost httppost = new HttpPost("http://localhost/action.do");httppost.setEntity(entity);43.布局的技巧 <fragment         android:id="@+id/fragment1"        android:name="com.gs.file.Fragment1"        android:layout_height="fill_parent"        android:layout_width="0dp"        android:layout_weight="1"        />    <fragment         android:id="@+id/fragment2"        android:name="com.gs.file.Fragment2"        android:layout_height="fill_parent"        android:layout_width="wrap_content"        />   这种方式   android:layout_width="0dp"   android:layout_weight="1"   对应  android:layout_width="wrap_content"   表示在 第二个布局 wrap_content的情况下，其他区域都是 布局一的   注意所有布局     android:layout_width=""    android:layout_height=""        都不能省 44.            style="?attr/buttonBarStyle"表示 从当前主题中 取出属性(此属性已经定义好了  值)45.<activity            android:name="com.gs.blog.MainActivity"            android:theme="@android:style/Theme.Wallpaper"Android 自带很多Activity的主题，有对话框.........很多46.    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getSupportMenuInflater().inflate(R.menu.example_list, menu);        return true;    }47.    <Button        android:id="@+id/right"        android:layout_width="200dp"        android:layout_height="200dp"        android:gravity="center"    里面的文字是 上下左右居中的          android:onClick="openMenu"        android:text="右边菜单" />48.下拉试试... ，松开刷新... ，刷新中49.退出提示， 确定要退出程序吗  取消 确定 ,返回按钮的监听50.  按钮点击后 都 换了背景色 ActionBar 上面 左边都有一个返回上一个Activity的按钮  <51. 不需要使用ActionBar ，java代码设置满屏 有点小bug, 此种方式设置直接就是满屏    <activity            android:name="com.gs.xm.MainActivity"            android:label="@string/app_name"            android:theme="@android:style/Theme.NoTitleBar" >    <application        android:icon="@drawable/icon"        android:label="@string/app_name"        android:name="com.renren.android.BaseApplication"        android:theme="@android:style/Theme.NoTitleBar" >   // 最直接的方法是在  <Application中设置，全部的Activity都是 满屏，就不怕ActionBar带来的 版本不一致问题了52.        AlertDialog.Builder builder = new Builder(DesktopActivity.this);        builder.setMessage("您确定要退出吗?");        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {            public void onClick(DialogInterface dialog, int which) {                dialog.dismiss();                finish();                android.os.Process.killProcess(android.os.Process.myPid());                System.exit(0);            }        });        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {            public void onClick(DialogInterface dialog, int which) {                dialog.cancel();            }        });        builder.create().show();    }53. 设置ViewPager的下面图标的背景色 如 4个,默认全部是白色，当前 index是 黑的，      54.FrameLayout 常用来 盛装 Fragment ,  tx.replace(R.layout.frame_layout,fragment1); 没有用到ViewPager中，我记错了55.<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.wl.junittest"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="9" />    <!-- 测试用例步骤2 -->        <instrumentation android:targetPackage="com.wl.junittest"            android:name="android.test.InstrumentationTestRunner"            android:label="AndroidJunit"            />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.wl.junittest.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <!-- 测试用例步骤1 -->     <uses-library android:name="android.test.runner"/>      </application></manifest>56.  回调函数的两种写法方式1:package com.gs.callback;public class Work {    public interface CallBack{        public void list(String str);    }    public void doWork(String str,CallBack back){        back.list(str);   // back 必须实例化 过才能调用其方法    }}直接实现 public class Main implements CallBack{    @Test    public void test(){        Work work = new Work();        work.doWork("输出字符串.......",this);    }    @Override    public void list(String str) {        System.out.println("===============>"+str);    }}方式二:匿名内部类public class Work 回调函数的编写 一样public class Main{    @Test    public void test(){        Work work = new Work();        work.doWork("输出字符串.......",new CallBack() {            @Override            public void list(String str) {                System.out.println("=============>"+str);            }        });    }}方式三:public class Main implements CallBack{    @Test    public void test(){        Work work = new Work();        work.getInstance(new Main());  //实例化CallBack        work.doWork("输出字符串");    }    @Override    public void list(String str) {        System.out.println("=================>"+str);    }}public class Work {    private CallBack callBack;    public interface CallBack{        public void list(String str);    }    public void doWork(String str){        callBack.list(str);    }    public void getInstance(Main main){        callBack = main ;    }}57.登陆用httpClient，拿到session，保存该sessionId。上传用connection，setRequestProperty添加这个session。。58.小结：1、同名Header可以有多个 ，Header[] getHeaders(String name)。2、运行时使用的是第一个， Header getFirstHeader(String name)。3、addHeader，如果同名header已存在，则追加至原同名header后面。4、setHeader，如果同名header已存在，则覆盖一个同名header。public static void main(String[] args) {        HttpGet get = new HttpGet("http://www.baidu.com");        get.addHeader("Cookie", "aa");        get.addHeader("Cookie","bb");        System.out.println("=========================");        Header headers [] = get.getAllHeaders();        for(Header header:headers){            System.out.println(header.getName()+":"+header.getValue());        }    }结果:    =========================Cookie:aaCookie:bb其他方法: Header header_first = httpGet.getFirstHeader("Cookie");   System.out.println(header_first.getName()+"  "+header_first.getValue());59.     3xx (重定向) 要完成请求，需要进一步操作。通常，这些状态码用来重定向{        302 重定向         301(永久移动)请求的网页已永久移动到新位置        302(临时移动)服务器目前从不同位置的网页响应请求    }    404     503 - 服务器超时    2xx (成功) 表示成功处理了请求的状态码。  {     200 HTTP/1.1 200 OK  （包含请求转发也会直接处理 ）     201(已创建)请求成功并且服务器创建了新的资源     202(已接受)服务器已接受请求，但尚未处理。     203(非授权信息)服务器已成功处理了请求，但返回的信息可能来自另一来源     204(无内容)服务器成功处理了请求，但没有返回任何内容     205(重置内容)服务器成功处理了请求，但没有返回任何内容   ::与 204 响应不同，此响应要求请求者重置文档视图(例如，清除表单内容以输入新内容)。      206(部分内容)服务器成功处理了部分 GET 请求    }60.使用HttpClient处理重定向问题神奇现象:用get 的时，如果有重定向，会自动再去访问重定向的内容 。 但用post访问url就不会自动 重定向的内容 。用post访问url是地，我们经常会遇到返回301，302 返回代码，他们代表的是重定向。有两种方法让程序继续访问且 注意这个 重定向指的是 <script> window.location.href=""; </script>服务器端的  return "redirect:result";(重定向)  或 return "list";(请求转发)  HttpClient都会自动处理 public static void main(String[] args) throws Exception, IOException {        HttpClient client = new DefaultHttpClient();//方式1============ > start   //      HttpGet get = new HttpGet("http://localhost:8080/Upload/list");//      HttpResponse response = client.execute(get);   //方式1============ > end   此种方式会自动处理 重定向信息           HttpPost post = new HttpPost("http://localhost:8080/Upload/list");        HttpResponse response = client.execute(post);        int responseCode = response.getStatusLine().getStatusCode();        System.out.println("responseCode:"+responseCode);        System.out.println(EntityUtils.toString(response.getEntity()));        if(responseCode==301||responseCode==302){            System.out.println("重定向了");            Header headers[] = response.getHeaders("Location");            String location = headers[0].getValue();            System.out.println(location);        }    }61. 使用HttpClient完成更高级的功能有时候提交到大网站，发现参数特别多方法:1.先Get获取 到cookie2.然后再次提交 设置cookie为 Response获取到的，并且修改部分字段setHeader();62. @Test    // 设置已获取的cookie，查看需要登录后才能查看的页面    public void testGetinfoByLoginCookie() throws Exception, IOException {        DefaultHttpClient httpclient = new DefaultHttpClient();        CookieStore cookieStore = new BasicCookieStore();        BasicClientCookie cookie1 = new BasicClientCookie("ThinkID","5s4tmqem08gh091v3egoa7sqf7");        cookie1.setDomain(".lashou.com");        BasicClientCookie cookie2 = new BasicClientCookie("city_b","2419");        cookie2.setDomain("lashou.com");        BasicClientCookie cookie3 = new BasicClientCookie("client_key","1425104707wd157b4b24ff70adcb875a");        cookie3.setDomain("lashou.com");        BasicClientCookie cookie4 = new BasicClientCookie("login_name2","testuser007");        cookie4.setDomain("lashou.com");        BasicClientCookie cookie5 = new BasicClientCookie("pwd2","4c88a4062736c26572d3ec382868fa2b");        cookie5.setDomain("lashou.com");        cookieStore.addCookie(cookie1);        cookieStore.addCookie(cookie2);        cookieStore.addCookie(cookie3);        cookieStore.addCookie(cookie4);        cookieStore.addCookie(cookie5);        List<Cookie> cookies = new ArrayList<Cookie>();        httpclient.setCookieStore(cookieStore);        List<Cookie> cookieList = httpclient.getCookieStore().getCookies();        for(int i=0;i<cookieList.size();i++){            System.out.println("cookie"+i+":"+cookieList.get(i));        }        // 设置已登录的cookie        String memberpage = "http://www.lashou.com/account/orders/";        HttpGet httpget = new HttpGet(memberpage);        HttpResponse response = httpclient.execute(httpget); // 必须是同一个HttpClient！        HttpEntity entity = response.getEntity();        entity = response.getEntity();        String html = EntityUtils.toString(entity, "GBK");        httpget.releaseConnection();        System.out.println(html);    }63.简单使用package com.gs.test;import java.io.IOException;import java.net.URL;import java.util.ArrayList;import java.util.List;import java.util.Set;import com.gargoylesoftware.htmlunit.BrowserVersion;import com.gargoylesoftware.htmlunit.HttpMethod;import com.gargoylesoftware.htmlunit.WebClient;import com.gargoylesoftware.htmlunit.WebRequest;import com.gargoylesoftware.htmlunit.html.HtmlPage;import com.gargoylesoftware.htmlunit.util.Cookie;import com.gargoylesoftware.htmlunit.util.NameValuePair;public class Test {    public static void main(String[] args) throws Exception, IOException {        WebClient wc = new WebClient(BrowserVersion.INTERNET_EXPLORER_11);        wc.getOptions().setUseInsecureSSL(true);        wc.getOptions().setCssEnabled(false);        wc.getOptions().setJavaScriptEnabled(true);        // 3 启动客户端重定向          wc.getOptions().setRedirectEnabled(true);         wc.getOptions().setThrowExceptionOnScriptError(false);        wc.getOptions().setTimeout(10000);        wc.getOptions().setDoNotTrackEnabled(false); //设置不跟踪         //----------------------------        //设置Cookies  : 可以用于认证数据        wc.getCookieManager().setCookiesEnabled(true);         Cookie cookie  = new Cookie("baidu.com","key","value");        wc.getCookieManager().addCookie(cookie);        //----------------------------        WebRequest request  = new WebRequest(new URL("http://www.baidu.com"));//      request.setHttpMethod(HttpMethod.GET);        request.setHttpMethod(HttpMethod.POST);        List<NameValuePair> list = new ArrayList<NameValuePair>();        list.add(new NameValuePair("username", "wangli"));        request.setRequestParameters(list);        HtmlPage htmlPage = wc.getPage(request);        System.out.println(htmlPage.asXml());        //----------------------------        //获取cookie         Set<Cookie> ResponseCookies = wc.getCookieManager().getCookies();        for(Cookie c:ResponseCookies){            System.out.println("获取的Cookie是------>"+c.getName()+":"+c.getValue());        }        //----------------------------        /*         *         WebResponse response = htmlPage.getWebResponse();        response.cleanUp(); // 关闭响应流          */    }}64.bottom_bar.xml <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/bottom"    android:layout_width="fill_parent"    android:layout_height="55dp"    android:layout_alignParentBottom="true"    android:background="@drawable/bottom_bar"    >    <TextView         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:textColor="#fff"        android:text="使用include layout 可以使其显示在 主布局的底部"/></RelativeLayout>MainActivity:<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <FrameLayout        android:id="@+id/id_content"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1" >    </FrameLayout>   <include layout="@layout/bottom_bar"/></LinearLayout>65. 布局     <LinearLayout         android:layout_width="fill_parent"        android:layout_height="55dp">        <LinearLayout             android:id="@+id/tab_weixin"            android:layout_width="0dp"            android:layout_height="fill_parent"            android:layout_weight="1"            android:descendantFocusability="beforeDescendants"  //=====================            android:gravity="center"            android:orientation="vertical">            <ImageButton                 android:id="@+id/weixin"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:background="#0000"                android:clickable="false"                android:src="@drawable/tab_weixin_pressed"/>            <TextView                 android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="微信"/>        </LinearLayout>beforeDescendants：viewgroup会优先其子类控件而获取到焦点   afterDescendants：viewgroup只有当其子类控件不需要获取焦点时才获取焦点   blocksDescendants：viewgroup会覆盖子类控件而直接获得焦点   66.WebView 的使用 // 监听 所有点击的链接，如果拦截到我们需要的，就跳转到相对应的页面。private class MyWebViewClient extends WebViewClient {@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {System.out.println("----------------------shouldOverrideUrlLoading 。。 url:" + url);if (url != null && url.contains("/m/phoneRegiste.do")) {Intent intent = new Intent(PublicWebView.this, RegisterByPhone.class);PublicWebView.this.startActivity(intent);finish();return true;}  return super.shouldOverrideUrlLoading(view, url);}67. mWebView.setWebChromeClient(new WebChromeClient(){            public boolean onJsAlert(WebView view, String url, String message, JsResult result) {                //偷懒直接接收JS中传过来的msg                if(message.length() > 15){                    mLoginBackJson = message;                    Log.i(TAG, "mLoginBackJson = " + mLoginBackJson);                    if(parseJson(mLoginBackJson)){//解析传回的json文件，成功的话，进行一次业务的访问                        new MyTask().execute(ConfigUrl.ALL_CONTENT_VIEW);                    }                    //return true;                }                //保存一下cookie，后面httpclient使用                CookieManager cookieManager = CookieManager.getInstance();                CookieStr = cookieManager.getCookie(COOKIE_URL);                return super.onJsAlert(view, url, message, result);             }        });    }68.WebView 处理ajax请求You can use the JavascriptInterface to intercept the AJAX calls along with JQuery methods ajaxStart and ajaxComplete in following way:// our JavascriptInterfacepublic class AjaxHandler {    private static final String TAG = "AjaxHandler";    private final Context context;    public AjaxHandler(Context context) {        this.context = context;    }    public void ajaxBegin() {        Log.w(TAG, "AJAX Begin");        Toast.makeText(context, "AJAX Begin", Toast.LENGTH_SHORT).show();    }    public void ajaxDone() {        Log.w(TAG, "AJAX Done");        Toast.makeText(context, "AJAX Done", Toast.LENGTH_SHORT).show();    }}And here is how the AjaxHandler is used in Activity:    public class MainActivity extends Activity {    private static final String TAG = "MainActivity";    private WebView webView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        // get web view        webView = (WebView) findViewById(R.id.web);         // configure web view         final WebSettings webSettings = webView.getSettings();        webSettings.setBuiltInZoomControls(true);        webSettings.setJavaScriptEnabled(true);        webView.loadUrl("http://foo.com");        // add javascript interface        webView.addJavascriptInterface(new AjaxHandler(this), "ajaxHandler");        // override onPageFinished method of WebViewClient to handle AJAX calls         webView.setWebViewClient(new WebViewClient() {                @Override                public void onPageFinished(WebView view, String url) {                    super.onPageFinished(view, url);                    view.loadUrl("javascript:$(document).ajaxStart(function (event, request, settings) { " +                            "ajaxHandler.ajaxBegin(); " + // Event called when an AJAX call begins                            "});");                    view.loadUrl("javascript:$(document).ajaxComplete(function (event, request, settings) { " +                            "ajaxHandler.ajaxDone(); " + // Event called when an AJAX call ends                            "});");            });    }}69.把 httpClient的Cookie共享给 WebView DefaultHttpClient httpclient=....;String toUrl="https://cap.cityu.edu.hk/studentlan/details.aspx.....";List<Cookie> cookies = httpclient.getCookieStore().getCookies();if (! cookies.isEmpty()){    CookieSyncManager.createInstance(this);    CookieManager cookieManager = CookieManager.getInstance();        //sync all the cookies in the httpclient with the webview by generating cookie string    for (Cookie cookie : cookies){        String cookieString = cookie.getName() + "=" + cookie.getValue() + "; domain=" + cookie.getDomain();        cookieManager.setCookie(toUrl, cookieString);        CookieSyncManager.getInstance().sync();    }}   把WebView的Cookie共享给HttpClient 70.首先android5.0 实现了WebView与 框架的自动cookie同步，无需额外操作Set-Cookie Header     Set-Cookie响应头的格式如下所示：        Set-Cookie: =[; =]...                    [; expires=][; domain=]                    [; path=][; secure][; httponly]//  cookieManager.setCookie(url,cookie);cookieManager.setCookie(cookie.getDomain(),  cookie.getName() + "=" + cookie.getValue() + "; domain=" + cookie.getDomain() + "; path=" + cookie.getPath());CookieSyncManager.getInstance().sync();                 71.键盘事件 switch (event.getAction()) {     case MotionEvent.ACTION_DOWN:     //按钮按下逻辑     break；     case MotionEvent.ACTION_UP:     //按钮弹起逻辑     break； } Fragment 里面没有此方法 //  如果希望浏览的网页后退而不是退出浏览器，需要WebView覆盖URL加载，让它自动生成历史访问记录，那样就可以通过前进或后退访问已访问过的站点。     @Override        public boolean onKeyDown(int keyCode, KeyEvent event) {            // TODO Auto-generated method stub            if(keyCode==KeyEvent.KEYCODE_BACK)            {                if(webView.canGoBack())                {                    webView.goBack();//返回上一页面                    return true;                }                else                {                    System.exit(0);//退出程序                }            }            return super.onKeyDown(keyCode, event);        }72.百度登陆urlhttps://passport.baidu.com/v2/?login&fr=old登陆成功urlhttps://passport.baidu.com/center?_t=144281867673.混合模式更高级的做法是 先通过流获取到整个网页，然后 loadUrl(); 通过java的replace("","");替换 需要登陆的字符串 74.Session捕获 技巧(通用版 )Session什么时候失效？　　1. 服务器会把长时间没有活动的Session从服务器内存中清除，此时Session便失效。Tomcat中Session的默认失效时间为20分钟。　　2. 调用Session的invalidate方法。public class Tab1 extends Fragment{    private WebView webView;    private String loginOKurl = "https://passport.baidu.com/center?_t=1442818676";    private String cookieJsession;    //JavaScript对象     class WebObject {        Context mcontext ;        public WebObject(Context context){            this.mcontext = context;  //这个Context 不是必须的，仅仅是我们Toast等控件需要用这个对象        }        @JavascriptInterface        public void showSession(){            //在android API Level 17及以上的版本中，就会出现js调用不了android的代码，这是版本兼容的问题            CookieManager cookieManager = CookieManager.getInstance();            cookieManager.setAcceptCookie(true);            cookieJsession = cookieManager.getCookie(loginOKurl);  //登录成功url             Toast.makeText(getActivity(),"cookie是:"+cookieJsession, Toast.LENGTH_LONG).show();        }        @JavascriptInterface        public void skip(){            Intent intent = new Intent();            intent.setClass(mcontext, SessionShareActivity.class);            mcontext.startActivity(intent);        }     }    class MyWebViewClient extends WebViewClient{        @Override        public boolean shouldOverrideUrlLoading(WebView view, String url) {//          view.loadUrl(url);            WebObject webObject = new WebObject(getActivity());            webObject.showSession();  //获取到Session后            Intent intent = new Intent();            intent.putExtra("Jsession", cookieJsession);            intent.setClass(getActivity(), SessionShareActivity.class);            startActivity(intent);            return true;        }        //当load有ssl层的https页面时，如https://money.183.com.cn/，如果这个网站的安全证书在Android无法得到认证，WebView就会变成一个空白页        //处理ssl请求(https，需要证书的请求)        @Override        public void onReceivedSslError(WebView view, SslErrorHandler handler,                SslError error) {            //handler.cancel(); 默认的处理方式，WebView变成空白页             handler.proceed(); //接受证书            //handleMessage(Message msg); 其他处理        }    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.tab1, container,false);        webView = (WebView) view.findViewById(R.id.webView);        webView.setWebViewClient(new MyWebViewClient());        webView.getSettings().setJavaScriptEnabled(true);  //注意一定要设置这个哦，否则不会执行js        //设置WebView的缩放功能点       webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);         webView.setHorizontalScrollBarEnabled(false);  //没有水平滚动条         webView.getSettings().setSupportZoom(true);         webView.getSettings().setBuiltInZoomControls(true); //缩放控制条         webView.setInitialScale(70);         webView.setHorizontalScrollbarOverlay(true);  //         //      String data = "<center><h1>欢迎登陆南工</h1><a href='http://61.163.231.194:8080/Lab2.0/'>实验系统</a></center>";//      webView.loadDataWithBaseURL(null, data, "text/html", "utf-8", null);//      webView.loadData(data, "text/html", "UTF-8"); //这种方式是Android的bug         return view;    }    @Override    public void onActivityCreated(Bundle savedInstanceState) {        webView.addJavascriptInterface(new WebObject(getActivity()), "ss");//      webView.loadUrl("file:///android_asset/www/index.html");        webView.loadUrl("https://passport.baidu.com/v2/?login&fr=old");        super.onActivityCreated(savedInstanceState);    }}75.   ScrollView中只能放一个控件，一般都放LinearLayout，orientation属性值为vertica76.经常需要用ListView或者其它显示大量Items的控件实时跟踪或者查看信息，并且希望最新的条目可以自动滚动到可视范围内。通过设置控件transcriptMode属性可以将Android平台的控件（支持ScrollBar）自动滑动到最底部。 源代码： ListView 默认是会滚动的，故 无需设置 <ListView  android:id="@android:id/list"                                android:layout_width="fill_parent"                                 android:layout_height="fill_parent"                                 android:stackFromBottom="true"                                android:transcriptMode="alwaysScroll"               />77.一般来说在工作线程中执行耗时任务，当任务完成时，会返回UI线程，一般是更新UI。这时有两种方法可以达到目的。一种是handler.sendMessage。发一个消息，再根据消息，执行相关任务代码。另一种是handler.post(r)。r是要执行的任务代码。意思就是说r的代码实际是在UI线程执行的。可以写更新UI的代码。（工作线程是不能更新UI的）78.布局高级技术 1.View layout = getLayoutInflater().inflate(R.layout.menu_layout,null);int width = getWindowManager().getDefaultDisplay().getWidth();int height  = getWindowManager().getDefaultDisplay().getHeight();PopupWindow popwindow = new PopupWindow(layout,width,height);popwindow.showAtLocation(layout,Gravity.BOTTOM,0,0);  //显示 popwindow.dismiss();//关闭选项菜单 79.ormlite没有hibernate智能，更新表字段 不会更新数据库字段，数据库的更新只会根据版本号改变才会重新调用那个方法80.根据class 属性得到节点 HtmlElement resultData =  page.getBody();List<HtmlElement> columns = resultData.getElementsByAttribute("tr", "class", "content");//保存网页//rootPage.save(new File("src"));webClient.setAjaxController(new NicelyResynchronizingAjaxController());;//很重要，设置支持AJAX          模拟按钮 执行JavaScript 设置可以使用jQuery          StringBuilder js = new StringBuilder();js.append("$('#u').value='").append(WeiboAccount.USERNAME).append("';");js.append("$('#p').value='").append(WeiboAccount.PASSWORD).append("';");js.append("document.write('Success')");HtmlPage htmlPage = (HtmlPage) page;ScriptResult scriptResult = htmlPage.executeJavaScript(js.toString());HtmlPage downLoadPage = (HtmlPage) scriptResult.getNewPage();  //点击Excel图标，开始下载          ScriptResult downLoadResult = downLoadPage.executeJavaScript("javascript:exportData('/ddp’,'BULKEXCEL');");          //下载Excel文件          InputStream is = downLoadResult.getNewPage().getWebResponse().getContentAsStream();          OutputStream fos = new FileOutputStream("d://test.xls");          byte[] buffer=new byte[1024*30];          int len=-1;          while((len=is.read(buffer))>0){              fos.write(buffer, 0, len);          }          fos.close();          fos.close();          System.out.println("Success!");  81.Httpunit 执行表单点击     WebClient webClient = new WebClient();    HtmlPage page = webClient.getPage(url);    HtmlForm form = page.getForms().get(2);    HtmlSubmitInput button = form.getInputByValue(">");    HtmlPage page2 = button.click();    String originalHtml = page2.refresh().getWebResponse().getContentAsString();Httpunit 执行Ajax请求 82.alternative adj.  替代的; 另类的; 备选的; 其他的; n.  可供选择的事物;//this would cause all ajax calls to be synchronous.webClient.setAjaxController(new NicelyResynchronizingAjaxController());;//很重要，设置支持AJAX//  Alternatively, did you try in your solution to call to "webClient.waitForBackgroundJavaScript(10000)" after tou got the page?//Something like this:HtmlPage page2 = button.click();webClient.waitForBackgroundJavaScript(10000)String originalHtml = page2.asXml();return originalHtml;例子1:ScriptResult scriptResult = page.executeJavaScript("$('#cur a[txt=2]').click();");HtmlPage htmlPage = (HtmlPage) scriptResult.getNewPage();System.out.println(htmlPage.asText());例子2:版本1:public class YoutubeBot {private static final String YOUTUBE = "http://www.youtube.com";public static void main(String[] args) throws FailingHttpStatusCodeException, MalformedURLException, IOException {    WebClient webClient = new WebClient();    webClient.setThrowExceptionOnScriptError(false);    // This is equivalent to typing youtube.com to the adress bar of browser    HtmlPage currentPage = webClient.getPage("http://www.youtube.com/results?search_type=videos&search_query=official+music+video&search_sort=video_date_uploaded&suggested_categories=10%2C24&uni=3");    // Get form where submit button is located    HtmlForm searchForm = (HtmlForm) currentPage.getElementById("masthead-search");    // Get the input field.    HtmlTextInput searchInput = (HtmlTextInput) currentPage.getElementById("masthead-search-term");    // Insert the search term.    searchInput.setText("java");    // Workaround: create a 'fake' button and add it to the form.    HtmlButton submitButton = (HtmlButton) currentPage.createElement("button");    submitButton.setAttribute("type", "submit");    searchForm.appendChild(submitButton);    //Workaround: use the reference to the button to submit the form.     HtmlPage newPage = submitButton.click();    //Find all links on page with given class    final List<HtmlAnchor> listLinks = (List<HtmlAnchor>) currentPage.getByXPath("//a[@class='ux-thumb-wrap result-item-thumb']");          //Print all links to console    for (int i=0; i<listLinks.size(); i++)        System.out.println(YOUTUBE + listLinks.get(i).getAttribute("href"));    }}    HtmlAnchor 控件用于控制 <a> 元素。在 HTML 中，<a> 元素用于创建超链接。超链接可链接到书签或其他网页版本2:public class YoutubeBot {   private static final String YOUTUBE = "http://www.youtube.com";   @SuppressWarnings("unchecked")   public static void main(String[] args) throws FailingHttpStatusCodeException, MalformedURLException, IOException {      WebClient webClient = new WebClient();      webClient.setThrowExceptionOnScriptError(false);      // This is equivalent to typing youtube.com to the adress bar of browser      HtmlPage currentPage = webClient.getPage(YOUTUBE);      // Get form where submit button is located      HtmlForm searchForm = (HtmlForm) currentPage.getElementById("masthead-search");      // Get the input field      HtmlTextInput searchInput = (HtmlTextInput) currentPage.getElementById("masthead-search-term");      // Insert the search term      searchInput.setText("java");      // Workaround: create a 'fake' button and add it to the form      HtmlButton submitButton = (HtmlButton) currentPage.createElement("button");      submitButton.setAttribute("type", "submit");      searchForm.appendChild(submitButton);      // Workaround: use the reference to the button to submit the form.      currentPage = submitButton.click();      // Get the div containing the filters      HtmlElement filterDiv = currentPage.getElementById("search-lego-refinements");      // Select the first link from the filter block (Upload date)      HtmlAnchor sortByDateLink = ((List<HtmlAnchor>) filterDiv.getByXPath("//ul/li/a")).get(0);      // Click the 'Upload date' link      currentPage = sortByDateLink.click();      System.out.println(currentPage.asText());   }}//使用代理  //      WebClient webClient=new WebClient(BrowserVersion.FIREFOX_10,"http://myproxyserver",8000);          WebClient webClient2=new WebClient(BrowserVersion.INTERNET_EXPLORER_10);  注意:       // 模拟浏览器打开一个目标网址          final HtmlPage page = webClient.getPage(url);  //      该方法在getPage()方法之后调用才能生效          webClient.waitForBackgroundJavaScript(1000*3);          webClient.setJavaScriptTimeout(0);                  <input class="logging" type="button" tabindex="5" value="登 录" accesskey="l">        HtmlButtonInput btn  = loginForm.getInputByValue("登 录");//注意 登录中间有括号的情况  （注意这里写成HtmlSubmitInput就会报转换异常了）        HtmlPasswordInput  password = loginForm.getInputByName("password");//不能写成 HtmlTextInput          这里类型 都是根据  <input type="submit" type="text" type="password"一些技巧:    (1) 等待js执行完毕         *             //try 20 times to wait .5 second each for filling the page.            for (int i = 0; i < 20; i++) {                if (condition_to_happen_after_js_execution) {                    break;                }                synchronized (page) {                    page.wait(500);                }            }             */    (2)     ScriptResult scriptResult = page.executeJavaScript("$('#cur a[txt=2]').click();");    HtmlPage htmlPage = (HtmlPage) scriptResult.getNewPage();    System.out.println(htmlPage.asText());      (3) 通过class元素得到 DOM对象         /*             *             List<HtmlElement> columns = resultData.getElementsByAttribute("tr", "class", "content");//          List<HtmlElement> ahref = resultData.getElementsByAttribute("a", "txt", "2");            List<HtmlElement> ahref = resultData.getElementsByAttribute("a", "class", "j_th_tit");//          HtmlPage page2 = ahref.get(0).click();            for(HtmlElement element:ahref){                System.out.println(element.asText());            }             */    (4).    HtmlPage currentPage = webClient.getPage("http://www.google.com/");    HtmlImage imgElement = (HtmlImage)currentPage.getHtmlElementById("logo");    System.out.println(imgElement.getAttribute("src"));    (5).    HttpUnit登录功能     HtmlInput username = page.getHtmlElementById("username");      //注意是 page.getHtmlElementById() 不是 page.getElementById();哦     HtmlInput password = page.getHtmlElementById("password");    HtmlInput btn = page.getFirstByXPath(".//*[@id='vForm']/div[3]/ul/li[6]/div[2]/input");    username.setAttribute("value", "wangli");    password.setAttribute("value", "1234");    HtmlPage result = btn.click();    (6).        例子:采集Demo public class Demo {    public static void main(String[] args) {        LogFactory.getFactory().setAttribute("org.apache.commons.logging.Log","org.apache.commons.logging.impl.NoOpLog");          java.util.logging.Logger.getLogger("net.sourceforge.htmlunit").setLevel(java.util.logging.Level.OFF);          try {            WebClient webClient = new WebClient(BrowserVersion.CHROME);            webClient.getOptions().setThrowExceptionOnScriptError(false);//当JS执行出错的时候是否抛出异常            webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);              webClient.getOptions().setTimeout(30000);//设置“浏览器”的请求超时时间            webClient.getOptions().setJavaScriptEnabled(true);            webClient.getOptions().setCssEnabled(false);            webClient.getCookieManager().setCookiesEnabled(true);            webClient.waitForBackgroundJavaScript(30000);//设置JS后台等待执行时间            //          this would cause all ajax calls to be synchronous.            webClient.setAjaxController(new NicelyResynchronizingAjaxController());;//很重要，设置支持AJAX            //去哪网//          String url = "http://flight.qunar.com/site/oneway_list.htm?searchDepartureAirport=%E4%B8%8A%E6%B5%B7&searchArrivalAirport=%E9%87%8D%E5%BA%86&searchDepartureTime=2015-09-26&searchArrivalTime=2015-09-28&nextNDays=0&startSearch=true&ex_track=ap_20100201";            String url = "http://xinjinqiao.tprtc.com/admin/main/flrpro.do#";//          String url = "http://tieba.baidu.com/f?ie=utf-8&kw=java&fr=search";            HtmlPage page = webClient.getPage(url);            List hrefs = page.getByXPath("//span[@id=\"cur\"]/a");//          HtmlAnchor pre = (HtmlAnchor) hrefs.get(0);   //上一页//          HtmlAnchor next = (HtmlAnchor) hrefs.get(1);  //下一页            int currentPage  = 1;            print(page,currentPage);        } catch (Exception e) {            // TODO: handle exception        }    }    public static void print(HtmlPage page,int flag){        try {            System.out.println("----------->第"+flag+"页");            System.out.println(page.asText());            HtmlAnchor href = page.getAnchorByText("下一页");            page = href.click();   // 不断更改引用             if(flag == 2 ){                return ;            }            flag ++;  //这个 和if判断一定要在自己调用自己之前执行哦            print(page,flag); //调用自己        } catch (Exception e) {            e.printStackTrace();        }    }}HTMLUnit 和 HttpUnit 别弄混了 经典语句:HtmlAnchor submit = page.getFirstByXPath("//form[@id='user-login']/a[1]");  HtmlInput login_name = (HtmlInput) page.getByXPath("//*[@id='loginName']").get(0);HtmlInput login_pass = (HtmlInput) page.getByXPath("//*[@id='loginPass']").get(0);HtmlInput loginInput = page.getHtmlElementById("loginName");HtmlInput passwordInput = page.getHtmlElementById("loginPass"); 例子:================================            HtmlForm loginForm = htmlPage.getForms().get(0);            HtmlTextInput  username = loginForm.getInputByName("username");            HtmlPasswordInput  password = loginForm.getInputByName("password");            HtmlSubmitInput btn  = loginForm.getInputByValue("登 录");//注意 登录中间有括号的情况//          username.setValueAttribute("Working_Harder");//          password.setValueAttribute("burning1223");            username.setValueAttribute("wangli");            password.setValueAttribute("wangli");            HtmlPage result = btn.click();            System.out.println(result.asText());其他参数 HTMLUnit会替我们处理 成功登陆百度云 的例子:public class Baidu {    public static void main(String[] args) {//      LogFactory.getFactory().setAttribute("org.apache.commons.logging.Log","org.apache.commons.logging.impl.NoOpLog");  //        java.util.logging.Logger.getLogger("net.sourceforge.htmlunit").setLevel(java.util.logging.Level.OFF);  //                try {            WebClient wc = new WebClient(BrowserVersion.FIREFOX_38);            wc.getOptions().setJavaScriptEnabled(true);            wc.getOptions().setCssEnabled(false);            wc.getOptions().setThrowExceptionOnScriptError(false);            wc.getOptions().setThrowExceptionOnFailingStatusCode(false);              wc.getCookieManager().setCookiesEnabled(true);            wc.waitForBackgroundJavaScript(3000);//设置JS后台等待执行时间            String url = "http://pan.baidu.com/";            HtmlPage htmlPage = wc.getPage(url);            wc.waitForBackgroundJavaScript(1000);  //这个放在 wc.getPage(url);后面            HtmlForm loginForm = htmlPage.getForms().get(0);            HtmlTextInput  username = loginForm.getInputByName("userName");            HtmlPasswordInput  password = loginForm.getInputByName("password");            HtmlSubmitInput btn  = loginForm.getInputByValue("登录");//注意 登录中间有括号的情况            username.setValueAttribute("burning你的心3");            password.setValueAttribute("454070wap.1223");            HtmlPage result = btn.click();            System.out.println(result.asText());        } catch (Exception e) {            e.printStackTrace();        }    }}83.SpannableString spanStr = new SpannableString("欢迎使用我的博客下载器");//各种span 类型         ForegroundColorSpan span  = new ForegroundColorSpan(Color.BLUE);//说明:  参数1,3 表示对 下标1~3(不包括3)应用样式 ，Spannable.SPAN_EXCLUSIVE_INCLUSIVE这个参数 指定，如果对已经应用了样式的 字符串,再输入(插入)Str,//  原 字符串 的前面或后面是否应用样式 ------->spanStr.setSpan(span, 1, 3, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);editText.setText(spanStr);84.    SpannableString spanStr = new SpannableString("欢迎使用我的博客下载器");        ForegroundColorSpan span  = new ForegroundColorSpan(Color.BLUE); //字体颜色        UnderlineSpan underlineSpan = new UnderlineSpan(); //下划线         StrikethroughSpan strikethroughSpan = new StrikethroughSpan();//删除线        StyleSpan styleSpan = new StyleSpan(Typeface.BOLD_ITALIC); // StyleSpan(粗体和斜体 )        BackgroundColorSpan backgroundColorSpan = new BackgroundColorSpan(Color.YELLOW); //背景色        AbsoluteSizeSpan sizeSpan = new AbsoluteSizeSpan(16); //字体大小        Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());  //means to provide you with the default height or width of that drawable.        ImageSpan imageSpan = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);        spanStr.setSpan(imageSpan, 1, 3, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);        editText.setText(spanStr);85.Android中visibility属性VISIBLE、INVISIBLE、GONE的区别可见（visible)XML文件：android:visibility="visible"Java代码：view.setVisibility(View.VISIBLE);不可见（invisible）XML文件：android:visibility="invisible"Java代码：view.setVisibility(View.INVISIBLE);隐藏（GONE）XML文件：android:visibility="gone"Java代码：view.setVisibility(View.GONE);VISIBLE：设置控件可见INVISIBLE：设置控件不可见GONE：设置控件隐藏而INVISIBLE和GONE的主要区别是：当控件visibility属性为INVISIBLE时，界面保留了view控件所占有的空间；而控件属性为GONE时，界面则不保留view控件所占有的空间。     86.File file = File.createTempFile("capture",".jpg",new File("/sdcard"));fos = new FileOutputStream(file);bitmap.compress(Bitmap.CompressFormat.PNG,90,fos);fos.flush();87.SlideMenu (android-support-v4.jar自带 )侧滑菜单，引用lib则需要 删除自带工程的  88.  彻底删除mysql  C:\program\C:\Documents and Settings\All users\MySQL\MySQL Server 5.1\data\mysql89.