【实战】（一）android模拟qq登录（get和post方法）

get方法来传递数据

一、项目介绍

主要是模拟qq登录，像服务器发送登录数据，如果数据相等，则登录成功。

二、项目架构

客户端Eclipse中

StreamTool.java 主要功能是将返回的数据流转化为数据串的工具类

源码：

MainActivity.java：

package com.lcz.login_in;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import com.lcz.newsclient.utils.StreamTool;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.text.TextUtils;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity implements View.OnClickListener{protected static final int SUCCESS = 0;protected static final int ERROR = 1;private Button login;private EditText ed_number;private EditText ed_pwd;private TextView tv_status;private  String path="http://192.168.43.125:8080/Web/servlet/login?";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        login=(Button) findViewById(R.id.login);        login.setOnClickListener(this);                ed_number=(EditText) findViewById(R.id.ed_number);        ed_pwd=(EditText) findViewById(R.id.ed_pwd);        tv_status=(TextView) findViewById(R.id.login_status);    }   private Handler mHandler=new Handler(){   public void handleMessage(Message msg) {   switch (msg.what) {case SUCCESS:String data=(String) msg.obj;tv_status.setText(data);break;case ERROR:Toast.makeText(MainActivity.this, "连接错误", 0).show();break;default:break;}   };   };   @Overridepublic void onClick(View v) {// TODO Auto-generated method stub//获得qq号码和密码，然后登录final String number = ed_number.getText().toString().trim();final String pwd=ed_pwd.getText().toString().trim();if(TextUtils.isEmpty(number)||(TextUtils.isEmpty(pwd))){Toast.makeText(this, "号码或密码不能为空", 0).show();return;}//走到这里，说明qq号码和密码都输入了，然后需要连接网络new Thread(){public void run() {try {path=path+"number="+URLEncoder.encode(number,"UTF-8")+"&pwd="+URLEncoder.encode(pwd,"UTF-8");URL url=new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);int code = conn.getResponseCode();if(code==200){InputStream in = conn.getInputStream();//流转换为字符串String data = StreamTool.decodeStream(in);Message msg = Message.obtain();msg.what=SUCCESS;msg.obj=data;mHandler.sendMessage(msg);}} catch (Exception e) {// TODO Auto-generated catch blockMessage msg = Message.obtain();msg.what=ERROR;mHandler.sendMessage(msg);e.printStackTrace();}};}.start();}    }

StreamTool.java:

package com.lcz.newsclient.utils;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;public class StreamTool {public static String decodeStream(InputStream in) throws Exception {// TODO Auto-generated method stubByteArrayOutputStream baos=new ByteArrayOutputStream();int len=0;byte[] buf=new byte[1024];while((len=in.read(buf))>0){baos.write(buf,0,len);}return baos.toString();}}

layout中activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"  android:orientation="vertical"    tools:context=".MainActivity" ><ImageView     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:src="@drawable/qq"    android:layout_gravity="center_horizontal"/>   <EditText    android:id="@+id/ed_number"    android:hint="请输入qq号码"         android:layout_width="fill_parent"        android:layout_height="wrap_content"        />  <EditText    android:id="@+id/ed_pwd"    android:hint="请输入qq密码"    android:inputType="textPassword"         android:layout_width="fill_parent"        android:layout_height="wrap_content"        />   <Button    android:id="@+id/login"    android:text="登录"        android:layout_width="fill_parent"        android:layout_height="wrap_content"/>    <TextView    android:id="@+id/login_status"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/></LinearLayout>

同样的添加权限AndroidMainfest.xml中：

<uses-permission android:name="android.permission.INTERNET"/>

服务器端MyEclipse中（这里是新建了一个web project，然后又建立了一个Servlet）

LoginServlet.java 主要是判断传来的账户和密码是否正确

源码：LoginServlet.java源码：

package com.lcz.login;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet {/** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. *  * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//GET方式要手动解决论码String number=request.getParameter("number");number=new String(number.getBytes("iso8859-1"),"UTF-8");String pwd=request.getParameter("pwd");System.out.println("number:"+number+",pwd:"+pwd);//如果qq号码5201314和密码520lczif("5201314".equals(number)&&"520lcz".equals(pwd)){//如果进来，则正确response.getWriter().print("login success");}else{response.getWriter().print("login falied");}}/** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. *  * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String number=request.getParameter("number");number=new String(number.getBytes("iso8859-1"),"UTF-8");String pwd=request.getParameter("pwd");System.out.println("number:"+number+",pwd:"+pwd);//如果qq号码5201314和密码520lczif("5201314".equals(number)&&"520lcz".equals(pwd)){//如果进来，则正确response.getWriter().print("login success");}else{response.getWriter().print("login falied");}}}

这里还需要将这个Web工程添加到服务器中

注意这里的Tomcat服务器是我添加的我本机上的服务器，在window下的preference中可以添加tomcat服务器，如下图

添加好tomcat服务器之后，tomcat服务器右键选择add deployment

之后出现下方图所示，在Project中选择自己的项目，确定就行，这里因为我已经挂载上去了，所以没显示那个web项目

之后还是右键tomcat服务器，启动tomcat服务器，如果再console控制台出现最后一行，表示启动成功

正确的将项目添加到tomcat如下图

三、连接测试
(1)电脑跟真机应该处于同一局域网内，这里我采用的是用手机开热点的方式。
(2)获取电脑的ip地址，cmd命令行下输入ipconfig来知晓
(3)防火墙打开8080端口，具体开启可参考点击打开链接
(4)运行即可。

post方法来传递数据

这里post方法只是在Eclipse中MainActivity中代码中有所不同，下面给出代码

package com.lcz.login_in;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import com.lcz.newsclient.utils.StreamTool;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.text.TextUtils;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity implements View.OnClickListener{protected static final int SUCCESS = 0;protected static final int ERROR = 1;private Button login;private EditText ed_number;private EditText ed_pwd;private TextView tv_status;private  String path="http://192.168.43.125:8080/Web/servlet/login";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        login=(Button) findViewById(R.id.login);        login.setOnClickListener(this);                ed_number=(EditText) findViewById(R.id.ed_number);        ed_pwd=(EditText) findViewById(R.id.ed_pwd);        tv_status=(TextView) findViewById(R.id.login_status);    }   private Handler mHandler=new Handler(){   public void handleMessage(Message msg) {   switch (msg.what) {case SUCCESS:String data=(String) msg.obj;tv_status.setText(data);break;case ERROR:Toast.makeText(MainActivity.this, "连接错误", 0).show();break;default:break;}   };   };   @Overridepublic void onClick(View v) {// TODO Auto-generated method stub//获得qq号码和密码，然后登录final String number = ed_number.getText().toString().trim();final String pwd=ed_pwd.getText().toString().trim();if(TextUtils.isEmpty(number)||(TextUtils.isEmpty(pwd))){Toast.makeText(this, "号码或密码不能为空", 0).show();return;}//走到这里，说明qq号码和密码都输入了，然后需要连接网络new Thread(){public void run() {try {//path=path+"number="+URLEncoder.encode(number,"UTF-8")+"&pwd="+URLEncoder.encode(pwd,"UTF-8");URL url=new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("POST");conn.setConnectTimeout(5000);conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//准备数据String data="number="+URLEncoder.encode(number,"UTF-8")+"&pwd="+URLEncoder.encode(pwd,"UTF-8");conn.setRequestProperty("Content-Length", data.length()+"");//这个地方表示告诉了 加了一个标志，要给服务器写数据了conn.setDoOutput(true);conn.getOutputStream().write(data.getBytes());int code = conn.getResponseCode();if(code==200){InputStream in = conn.getInputStream();//流转换为字符串String data2 = StreamTool.decodeStream(in);Message msg = Message.obtain();msg.what=SUCCESS;msg.obj=data2;mHandler.sendMessage(msg);}} catch (Exception e) {// TODO Auto-generated catch blockMessage msg = Message.obtain();msg.what=ERROR;mHandler.sendMessage(msg);e.printStackTrace();}};}.start();}    }