Android应用开发之Android平台向web应用提交信息

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GET方式

实验：提交视频名称、时长信息

url：

http://192.168.1.102:8080/videoweb/video/manage.do?method=save&name=xxx&timelength=90

资源

 <string name="app_name">VideoClient</string>    <string name="name">视频名称</string>    <string name="timeLength">时长</string>    <string name="save">保存</string>    <string name="success">数据保存成功</string>    <string name="fail">数据保存失败</string>    <string name="error">网络连接失败</string>    <string name="videoFile">视频文件</string>

布局

<TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/name" />     <EditText        android:id="@+id/nameEt"        android:layout_width="match_parent"        android:layout_height="wrap_content" >         <requestFocus />    </EditText>     <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/timeLength" />     <EditText        android:id="@+id/timeLengthEt"        android:layout_width="match_parent"        android:layout_height="wrap_content" >    </EditText>     <Button        android:id="@+id/saveBtn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="save" />

VideoService

public static boolean save(String name, String timeLength) throws Exception {       String path = "http://192.168.1.102:8080/videoweb/video/manage.do";       Map<String, String> params = new HashMap<String, String>();       params.put("name", name);       params.put("timelength", timeLength);       params.put("method", "save");        return sendPostRequestHttpClient(path, params, "UTF-8");    }     private static boolean sendPostRequestHttpClient(String path,           Map<String, String> params, String string) throws Exception {       // http://192.168.1.102:8080/videoweb/video/manage.do?method=save&name=xxx&timelength=90       StringBuilder pathBuilder = new StringBuilder(path);       pathBuilder.append("?");              for (Map.Entry<String, String> entry : params.entrySet()) {           pathBuilder.append(entry.getKey()).append("=")                  .append(entry.getValue()).append("&");       }       pathBuilder.deleteCharAt(pathBuilder.length() - 1);              URL url = new URL(pathBuilder.toString());       HttpURLConnection conn = (HttpURLConnection) url.openConnection();       conn.setRequestMethod("GET");       conn.setConnectTimeout(5000);       if (conn.getResponseCode() == 200) {           return true;       }       return false;    }

测试方法代码

VideoServiceTest

 public void testSave() throws Throwable{       VideoService.save("Sucan", "80");    }

中文字符解决方案：

服务器端代码：

VideoForm formbean = (VideoForm)form;if("GET".equals(request.getMethod())){    String name = new String(request.getParameter("name").getBytes("ISO8859-1"),"UTF-8");    System.out.println("视频名称: "+ name);    System.out.println("时长: "+formbean.getTimelength());}else{    System.out.println("视频名称: "+formbean.getName());    System.out.println("时长: "+formbean.getTimelength());}

客户端的VideoService中

POST方式

修改服务器端代码

Index.jsp

<form action="http://192.168.1.102:8080/videoweb/video/manage.do"method="post" >    <input type="hidden" name="method" value="save"><br/>    视频名称：<input type="text" name="name" value=""><br/>    时长：<input type="text" name="timelength" value=""><br/>        <input type="submit" value="提交"> </form>

利用HttpWatch对post传输进行简单讲解：

POST /videoweb/video/manage.do HTTP/1.1Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*Referer: http://192.168.1.102:8080/videoweb/Accept-Language: zh-cn,en-GB;q=0.5User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727)Content-Type: application/x-www-form-urlencodedAccept-Encoding: gzip, deflateHost: 192.168.1.102:8080Content-Length: 34Connection: Keep-AliveCache-Control: no-cacheCookie: JSESSIONID=AE51607F874103B085624AD38C68CF56 method=save&name=xxxx&timelength=2

编写业务类方法（VideoService）

private static boolean sendPostRequestHttpClient(String path,           Map<String, String> params, String encoding) throws Exception {       /*        * Content-Type: application/x-www-form-urlencoded        * Content-Length: 34        * method=save&name=xxxx&timelength=2        */       StringBuffer sb = new StringBuffer("");       if (params != null && !params.isEmpty()) {           for (Map.Entry<String, String> entry : params.entrySet()) {              sb.append(entry.getKey()).append("=")              // .append(entry.getValue()).append("&");                     .append(URLEncoder.encode(entry.getValue(), encoding)).append('&'); //url编码，解决中文乱码           }           sb.deleteCharAt(sb.length() - 1);       }              byte[] data = sb.toString().getBytes(); //得到实体数据eg. method=save&name=xxxx&timelength=2       URL url = new URL(path);       HttpURLConnection conn = (HttpURLConnection) url.openConnection();       conn.setRequestMethod("POST");       conn.setConnectTimeout(5000);       conn.setDoOutput(true); //允许通过POST方式提交数据，必须允许输出       conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");       conn.setRequestProperty("Content-Length", String.valueOf(data.length));              OutputStream outStream = conn.getOutputStream();       outStream.write(data);       outStream.flush();       outStream.close();              if (conn.getResponseCode() == 200) {           return true;       }       return false;    }

修改save方法

//     return sendGetRequestHttpClient(path, params, "UTF-8");       return sendPostRequest(path, params, "UTF-8");

运行客户端，测试代码，查看服务器后台打印

解释Post方式下中文乱码的处理：服务器端增加过滤器

HttpClient

简介

　　HTTP 协议可能是现在 Internet 上使用得最多、最重要的协议了，越来越多的 Java 应用程序需要直接通过 HTTP 协议来访问网络资源。虽然在 JDK 的 java net包中已经提供了访问 HTTP 协议的基本功能，但是对于大部分应用程序来说，JDK 库本身提供的功能还不够丰富和灵活。HttpClient 是 Apache Jakarta Common 下的子项目，用来提供高效的、最新的、功能丰富的支持 HTTP 协议的客户端编程工具包，并且它支持 HTTP 协议最新的版本和建议。HttpClient 已经应用在很多的项目中，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。现在HttpClient最新版本为 HttpClient 4.1.1

HttpClient 功能介绍

　　以下列出的是 HttpClient 提供的主要的功能，要知道更多详细的功能可以参见 HttpClient 的主页。

　　（1）实现了所有 HTTP 的方法（GET,POST,PUT,HEAD 等）

　　（2）支持自动转向

　　（3）支持 HTTPS 协议

（4）支持代理服务器等

实验步骤

在VideoService中添加方法sendRequestHttpClient

// HTTPS SSL  COOKIE    private static boolean sendRequestHttpClient(String path,           Map<String, String> params, String encoding) throws Exception {              List<NameValuePair> paramPairs = new ArrayList<NameValuePair>();       if(params!=null && !params.isEmpty()){           for(Map.Entry<String, String> entry: params.entrySet()){              BasicNameValuePair param = new BasicNameValuePair(entry.getKey(),entry.getValue());              paramPairs.add(param);           }       }       UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramPairs, encoding);       HttpPost post = new HttpPost(path);       post.setEntity(entity);       DefaultHttpClient client = new DefaultHttpClient(); //浏览器       HttpResponse response = client.execute(post);              /*        * HTTP/1.1 200 OK        * Server: Apache-Coyote/1.1        * Content-Type: text/html;charset=UTF-8        * Content-Length: 14        * Date: Thu, 22 Dec 2011 15:07:38 GMT        *        *淇濆瓨鎴愬        **/              if(response.getStatusLine().getStatusCode() == 200){           return true;       }       return false;    }

修改save方法

//     return sendGetRequestHttpClient(path, params, "UTF-8");//     return sendPostRequest(path, params, "UTF-8");       return sendRequestHttpClient(path, params, "UTF-8");

运行客户端，测试，查看服务器输出