安卓GET與POST網(wǎng)絡(luò)請(qǐng)求的三種方式

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，獲取responseText，這里用緩沖字符流
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();
    String line = null;
    while((line=reader.readLine()) != null){
      sb.append(line);
    }
    //獲取響應(yīng)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,這里是固定寫法，發(fā)送內(nèi)容的類型
    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    //5. output，這里要記得開啟輸出流，將自己要添加的參數(shù)用這個(gè)輸出流寫進(jìn)去，傳給服務(wù)端，這是socket的基本結(jié)構(gòu)
    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";
    //一定要記得將自己的參數(shù)轉(zhuǎn)換為字節(jié)，編碼格式是utf-8
    os.write(param.getBytes("utf-8"));
    os.flush();
    //6. is
    InputStream is = conn.getInputStream();
    //7. 解析is，獲取responseText
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();
    String line = null;
    while((line=reader.readLine()) != null){
      sb.append(line);
    }
    //獲取響應(yīng)文本
    String responseText = sb.toString();

  //1. 創(chuàng)建RequestQueue,這是一個(gè)請(qǐng)求隊(duì)列，相當(dāng)于消息機(jī)制處理
  private RequestQueue  mQueue = Volley.newRequestQueue(this);
    //2. StringRequest
    String url = "http://www.baidu.com";
    StringRequest req = new StringRequest(url, 
        new Listener<String>() {
          //請(qǐng)求成功后回調(diào) 在主線程中執(zhí)行
          public void onResponse(String responseText) {
            //解析json 封裝結(jié)果數(shù)據(jù)
            Gson gson = new Gson();
            //這里用的Gson解析JSON字符串      
            User result=gson.fromJson(responseText,RequestResult.class);
                      }
        }, new ErrorListener() {
          //請(qǐng)求出錯(cuò)時(shí) 執(zhí)行回調(diào) 在主線程中執(zhí)行
          public void onErrorResponse(VolleyError error) {
            error.printStackTrace();
          }
        });
  //把req 添加到 請(qǐng)求隊(duì)列中，一定要記得這一步，不然就相當(dāng)于沒有發(fā)送請(qǐng)求
    mQueue.add(req);

private RequestQueue mQueue; 
//post請(qǐng)求要用commonRequest請(qǐng)求實(shí)現(xiàn)
  String url="www.baidu.com";
  CommonRequest request = new CommonRequest(Request.Method.POST,url,new Response.Listener<String>() {
      public void onResponse(String response) {
        try {
        //這里是請(qǐng)求成功后調(diào)用的接口，用JSON工具解析數(shù)據(jù)
          JSONObject obj = new JSONObject(response);
        } catch (JSONException e) {
          e.printStackTrace();
        }
      }
    },new Response.ErrorListener() {
      public void onErrorResponse(VolleyError error) {
      }
    }){
      //如果用POST請(qǐng)求，要添加參數(shù)，一定要重寫這個(gè)方法來添加參數(shù)
      @Override
      protected Map<String, String> getParams() throws AuthFailureError {
        Map<String, String> resultMap = new HashMap<String, String>();
        //這里的添加的具體參數(shù)   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，新建一個(gè)請(qǐng)求參數(shù)對(duì)象
RequestParams params=new RequestParams("www.baidu.com?inm=2");
//直接調(diào)用x.http().get()方法，這里注意x是要用全局MyApplication中初始化后才可以使用，初始化方法為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,請(qǐng)求網(wǎng)絡(luò)數(shù)據(jù)失敗");
      }
      @Override
      public void onFinished() {
      }
      @Override
      public void onSuccess(String result) {
        Log.i("hap.zhu", "請(qǐng)求數(shù)據(jù)結(jié)果為:"+result);
        Gson gson=new Gson();
        Result result=gson.fromJson(result,Result.class);
        Log.i("hap.zhu", "加載結(jié)果為:"+result.toString());
    }
    });

//方法同GET，就是這么簡(jiǎn)單，網(wǎng)絡(luò)請(qǐng)求成功會(huì)回調(diào)監(jiān)聽器里的success接口，直接處理數(shù)據(jù)結(jié)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) {
        //網(wǎng)絡(luò)錯(cuò)誤也會(huì)提示錯(cuò)誤
        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);