安卓GET与POST网络请求的三种方式

http://image.baidu.com/search/index?tn=baiduimage&ipn=r&ct=201326592&cl=2&lm=-1&st=-1&fm=index&fr=&sf=1&fmq=&pv=&ic=0&nc=1&z=&se=1&showtab=0&fb=0&width=&height=&face=0&istype=2&ie=utf-8&word=%E5%8A%A8%E6%BC%AB，

  //1. URL    URL url = new URL("http://image.baidu.com/search/index?tn=baiduimage&ipn=r&ct=201326592&cl=2&lm=-1&st=-1&fm=index&fr=&sf=1&fmq=&pv=&ic=0&nc=1&z=&se=1&showtab=0&fb=0&width=&height=&face=0&istype=2&ie=utf-8&word=%E5%8A%A8%E6%BC%AB");    //2. HttpURLConnection    HttpURLConnection conn=(HttpURLConnection)url.openConnection();    //3. set(GET)    conn.setRequestMethod("GET");    //4. getInputStream    InputStream is = conn.getInputStream();    //5. 解析is，获取responseText，这里用缓冲字符流    BufferedReader reader = new BufferedReader(new InputStreamReader(is));    StringBuilder sb = new StringBuilder();    String line = null;    while((line=reader.readLine()) != null){      sb.append(line);    }    //获取响应文本    String responseText = sb.toString();

//1. URL    URL url = new URL("http://image.baidu.com/search/index");    //2. HttpURLConnection    HttpURLConnection conn = (HttpURLConnection)url.openConnection();    //3. POST    conn.setRequestMethod("POST");    //4. Content-Type,这里是固定写法，发送内容的类型    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");    //5. output，这里要记得开启输出流，将自己要添加的参数用这个输出流写进去，传给服务端，这是socket的基本结构    conn.setDoOutput(true);    OutputStream os = conn.getOutputStream();    String param = "tn=baiduimage&ipn=r&ct=201326592&cl=2&lm=-1&st=-1&fm=index&fr=&sf=1&fmq=&pv=&ic=0&nc=1&z=&se=1&showtab=0&fb=0&width=&height=&face=0&istype=2&ie=utf-8&word=%E5%8A%A8%E6%BC%AB";    //一定要记得将自己的参数转换为字节，编码格式是utf-8    os.write(param.getBytes("utf-8"));    os.flush();    //6. is    InputStream is = conn.getInputStream();    //7. 解析is，获取responseText    BufferedReader reader = new BufferedReader(new InputStreamReader(is));    StringBuilder sb = new StringBuilder();    String line = null;    while((line=reader.readLine()) != null){      sb.append(line);    }    //获取响应文本    String responseText = sb.toString();

  //1. 创建RequestQueue,这是一个请求队列，相当于消息机制处理  private RequestQueue  mQueue = Volley.newRequestQueue(this);    //2. StringRequest    String url = "http://www.baidu.com";    StringRequest req = new StringRequest(url,         new Listener<String>() {          //请求成功后回调 在主线程中执行          public void onResponse(String responseText) {            //解析json 封装结果数据            Gson gson = new Gson();            //这里用的Gson解析JSON字符串                  User result=gson.fromJson(responseText,RequestResult.class);                      }        }, new ErrorListener() {          //请求出错时 执行回调 在主线程中执行          public void onErrorResponse(VolleyError error) {            error.printStackTrace();          }        });  //把req 添加到 请求队列中，一定要记得这一步，不然就相当于没有发送请求    mQueue.add(req);

private RequestQueue mQueue; //post请求要用commonRequest请求实现  String url="www.baidu.com";  CommonRequest request = new CommonRequest(Request.Method.POST,url,new Response.Listener<String>() {      public void onResponse(String response) {        try {        //这里是请求成功后调用的接口，用JSON工具解析数据          JSONObject obj = new JSONObject(response);        } catch (JSONException e) {          e.printStackTrace();        }      }    },new Response.ErrorListener() {      public void onErrorResponse(VolleyError error) {      }    }){      //如果用POST请求，要添加参数，一定要重写这个方法来添加参数      @Override      protected Map<String, String> getParams() throws AuthFailureError {        Map<String, String> resultMap = new HashMap<String, String>();        //这里的添加的具体参数   resultMap.put("username",user.getName());        resultMap.put("userAge",user.getAge());        resultMap.put("userGender",user.getGender());resultMap.put("userSchool",user.getSchool());        return resultMap;      }    };    mQueue.add(request);  }

//第一步，新建一个请求参数对象RequestParams params=new RequestParams("www.baidu.com?inm=2");//直接调用x.http().get()方法，这里注意x是要用全局MyApplication中初始化后才可以使用，初始化方法为x.Ext.init(this)    x.http().get(params, new Callback.CommonCallback<String>() {      @Override      public void onCancelled(CancelledException arg0) {      }      @Override      public void onError(Throwable arg0, boolean arg1) {        Log.i("hap.zhu", "http_on_error,请求网络数据失败");      }      @Override      public void onFinished() {      }      @Override      public void onSuccess(String result) {        Log.i("hap.zhu", "请求数据结果为:"+result);        Gson gson=new Gson();        Result result=gson.fromJson(result,Result.class);        Log.i("hap.zhu", "加载结果为:"+result.toString());    }    });

//方法同GET，就是这么简单，网络请求成功会回调监听器里的success接口，直接处理数据结果就行  RequestParams params=new RequestParams("www.baidu.com");    params.addBodyParameter("email", username);    params.addBodyParameter("password", password);    x.http().post(params, new CommonCallback<String>() {      @Override      public void onCancelled(CancelledException arg0) {      }      @Override      public void onError(Throwable arg0, boolean arg1) {        //网络错误也会提示错误        callback.Error(arg0.toString());      }      @Override      public void onFinished() {      }      @Override      public void onSuccess(String result) {        Gson gson=new Gson();      LoginResult loginResult=gson.fromJson(result, LoginResult.class);