android经常使用的http请求

Handler handler = new Handler(new android.os.Handler.Callback() {
     @Override
      public boolean handleMessage(Message msg) {
          switch (msg.arg1) {
             case 1:  // 对获取的数据进行操做

                   break;
              case 2:  // 对获取到数据进行操做

                    break;
              default:

                  break;
            }

          return false;
       }
 });

 

//联网前，检查网络的操做在此省略不写。

 public void sendWebRequest() {
         new Thread(new Runnable() {
              @Override
               public void run() {
                     HttpURLConnection conn = null;
                      try {
                           URL url = new URL("www.baidu.com");
                           conn = (HttpURLConnection) url.openConnection();
                           conn.setRequestMethod("GET");// get请求方式：从服务端读取数据

                         /*
                          * post：将数据提交到服务端。 注意点: 每条数据以键值对形式存在 数据间用 & 分隔
                          * conn.setRequestMethod("POST"); //post：将数据提交到服务端
                          * DataOutputStream dataoutputstream=new DataOutputStream( conn.getOutputStream() );
                          * dataoutputstream.writeBytes("username=haha&password=123456" );

                          //每条数据以键值对形式存在，数据间用 & 分隔
                         */

                             conn.setConnectTimeout(8 * 1000);
                             conn.setReadTimeout(1000 * 8);
                             conn.connect();

                             BufferedReader reader = new BufferedReader(
                                                      new InputStreamReader(conn.getInputStream()));
                             StringBuffer buffer = new StringBuffer(); // 用于存储获取到的数据
                             String line;
                             while ((line = reader.readLine()) != null) {
                                           buffer.append(line);
                              }
                             // 注意点： 子线程不能对UI控件操做，须要到主线程（即UI线程）才能操做ui控件
                            Looper.prepare();
                            Message message = handler.obtainMessage();
                            message.obj = buffer;
                            message.arg1 = 1;
                            handler.sendMessage(message);
                           Looper.loop();

                        } catch (Exception e) {
                              e.printStackTrace();
                       }

                       finally {
                               if (conn != null) {
                                   conn.disconnect();
                                }
                       }

             }
        }).start();

    }

   public void sendhttpconnet() {
           new Thread(new Runnable() {
                   public void run() {
                       try {
                            // HttpClient是一个接口，不能new 自己。 故new 一个默认的httpclient
                           HttpClient httpclient = (HttpClient) new DefaultHttpClient();
                           HttpGet get = new HttpGet("http://www.baidu.com");  // get请求
                           /*
                            * post 请求：提交数据到服务端，或者上传文件到服务端 HttpPost post=new
                            * HttpPost("http://www.baidu.com"); List<NameValuePair>
                            * parameters=new ArrayList<NameValuePair>(); //用来存放数据
                            * parameters.add(new BasicNameValuePair("name", "admin"));
                            * parameters.add(new BasicNameValuePair("pwd", "123456"));
                            * UrlEncodedFormEntity entity1=new UrlEncodedFormEntity(parameters, "utf-8");
                            * post.setEntity(entity1);
                            */

                            HttpResponse respone = httpclient.execute(get);

                           // 判断是否请求成功
                           if (respone.getStatusLine().getStatusCode() == 200) {
                                       HttpEntity entity = respone.getEntity();
                                       String s = EntityUtils.toString(entity, "utf-8"); // 转换成 String 类型

                                       Looper.prepare();
                                       Message message = handler.obtainMessage();
                                       message.obj = s;
                                       message.arg1 = 2;
                                       handler.sendMessage(message);
                                       Looper.loop();

                           }
                       } catch (Exception e) {
                            e.printStackTrace();
                       }

                  }            }).start();   }