Android客戶端與服務器端交互方式總結

一、HttpClient 方式：

//第一步：創建一個客戶端實例
HttpClient httpClient = new DefaultHttpClient(); 
//第二步：創建Http請求
HttpPost  httpRequest = new HttpPost(url);  
//第三步： Entity作爲Http的request報文的一部分進行傳輸 
httpRequest.setEntity(new UrlEncodedFormEntity( nameValuePair ));  
//第四步：發送http的請求request，並接受服務器返回的response
HttpResponse response=httpClient.execute(httpRequest);

//第五步： 根據返回狀態碼，若成功（200）則獲取Entity，若失敗，則返回
if(httpResponse.getStatusLine().getStatusCode()==HttpStatus.SC_OK)      
        result=EntityUtils.toString(httpResponse.getEntity(), HTTP.UTF_8);
else
        result="登陸失敗！";  

二、HttpURLConnection方式

For example, to retrieve the webpage at http://www.android.com/:

 URL url = new URL("http://www.android.com/");
   HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
   try {
     InputStream in = new BufferedInputStream(urlConnection.getInputStream());
     readStream(in);
    finally {
     urlConnection.disconnect();
   }
 }