Android：使用HttpUrlConnection發送請求

Question

如何使用HttpUrlConnection發送POST請求？

我已經使用HttpClient嘗試，但它現在已經過時

Answer 1

私有類LoginTask延伸的AsyncTask { ProgressDialog pdLoading =新ProgressDialog（LoginActivity.this）;

@Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 

     pdLoading.setMessage("Logging In ..."); 
     pdLoading.show(); 
    } 

    @Override 
    protected Void doInBackground(Void... params) { 
     try { 
      URL url = new URL(Constants.SERVER_URL); 

      HashMap<String, String> parameters = new HashMap<String, String>(); 
      parameters.put("method", "login"); 
      parameters.put("email", "customer@gmail.com"); 
      parameters.put("password", "customer123"); 
      parameters.put("device_token", "123456"); 
      parameters.put("device_type", "android"); 
      parameters.put("timezone", "Asia/Kolkata"); 

      Set set = parameters.entrySet(); 
      Iterator i = set.iterator(); 
      StringBuilder postData = new StringBuilder(); 

      for (Map.Entry<String, String> param : parameters.entrySet()) { 
       if (postData.length() != 0) { 
        postData.append('&'); 
       } 

       postData.append(URLEncoder.encode(param.getKey(), "UTF-8")); 
       postData.append('='); 
       postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8")); 
      } 

      byte[] postDataBytes = postData.toString().getBytes("UTF-8"); 

      System.setProperty("http.keepAlive", "false"); 
      HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
      conn.setRequestMethod("POST"); 
      conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
      conn.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length)); 
      conn.setUseCaches(false); 
      conn.setConnectTimeout(30000); 
      conn.setDoOutput(true); 
      conn.setDoInput(true); 
      conn.getOutputStream().write(postDataBytes); 
      BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8")); 
      StringBuilder builder = new StringBuilder(); 
      for (String line = null; (line = reader.readLine()) != null;) { 
       builder.append(line).append("\n"); 
      } 
      reader.close(); 
      conn.disconnect(); 
      Log.e(TAG, builder.toString()); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 

    @Override 
    protected void onPostExecute(Void result) { 
     super.onPostExecute(result); 

     pdLoading.dismiss(); 
    } 
}