Android開發中的幾種網絡請求方式詳解

Android應用經常會和服務器端交互，這就需要手機客戶端發送網絡請求，下面介紹四種常用網絡請求方式，我這邊是通過Android單元測試來完成這四種方法的，還不清楚Android的單元測試的同學們請看Android開發技巧總結中的Android單元測試的步驟一文。

Java.NET包中的HttpURLConnection類

Get方式：

// Get方式請求 
public static void requestByGet() throws Exception { 
 String path = "http://www.jb51.net/logins.jsp?id=helloworld&pwd=android"; 
 // 新建一個URL對象 
 URL url = new URL(path); 
 // 打開一個HttpURLConnection連接 
 HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); 
 // 設置連接超時時間 
 urlConn.setConnectTimeout(5 * 1000); 
 // 開始連接 
 urlConn.connect(); 
 // 判斷請求是否成功 
 if (urlConn.getResponseCode() == HTTP_200) { 
  // 獲取返回的數據 
  byte[] data = readStream(urlConn.getInputStream()); 
  Log.i(TAG_GET, "Get方式請求成功，返回數據如下："); 
  Log.i(TAG_GET, new String(data, "UTF-8")); 
 } else { 
  Log.i(TAG_GET, "Get方式請求失敗"); 
 } 
 // 關閉連接 
 urlConn.disconnect(); 
} 

Post方式：

// Post方式請求 
public static void requestByPost() throws Throwable { 
 String path = "http://www.jb51.net/logins.jsp"; 
 // 請求的參數轉換為byte數組 
 String params = "id=" + URLEncoder.encode("helloworld", "UTF-8") 
   + "&pwd=" + URLEncoder.encode("android", "UTF-8"); 
 byte[] postData = params.getBytes(); 
 // 新建一個URL對象 
 URL url = new URL(path); 
 // 打開一個HttpURLConnection連接 
 HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); 
 // 設置連接超時時間 
 urlConn.setConnectTimeout(5 * 1000); 
 // Post請求必須設置允許輸出 
 urlConn.setDoOutput(true); 
 // Post請求不能使用緩存 
 urlConn.setUseCaches(false); 
 // 設置為Post請求 
 urlConn.setRequestMethod("POST"); 
 urlConn.setInstanceFollowRedirects(true); 
 // 配置請求Content-Type 
 urlConn.setRequestProperty("Content-Type", 
   "application/x-www-form-urlencode"); 
 // 開始連接 
 urlConn.connect(); 
 // 發送請求參數 
 DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream()); 
 dos.write(postData); 
 dos.flush(); 
 dos.close(); 
 // 判斷請求是否成功 
 if (urlConn.getResponseCode() == HTTP_200) { 
  // 獲取返回的數據 
  byte[] data = readStream(urlConn.getInputStream()); 
  Log.i(TAG_POST, "Post請求方式成功，返回數據如下："); 
  Log.i(TAG_POST, new String(data, "UTF-8")); 
 } else { 
  Log.i(TAG_POST, "Post方式請求失敗"); 
 } 
} 
 

org.apache.http包中的HttpGet和HttpPost類

Get方式：

// HttpGet方式請求 
public static void requestByHttpGet() throws Exception { 
 String path = "http://www.jb51.net/logins.jsp?id=helloworld&pwd=android"; 
 // 新建HttpGet對象 
 HttpGet httpGet = new HttpGet(path); 
 // 獲取HttpClient對象 
 HttpClient httpClient = new DefaultHttpClient(); 
 // 獲取HttpResponse實例 
 HttpResponse httpResp = httpClient.execute(httpGet); 
 // 判斷是夠請求成功 
 if (httpResp.getStatusLine().getStatusCode() == HTTP_200) { 
  // 獲取返回的數據 
  String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8"); 
  Log.i(TAG_HTTPGET, "HttpGet方式請求成功，返回數據如下："); 
  Log.i(TAG_HTTPGET, result); 
 } else { 
  Log.i(TAG_HTTPGET, "HttpGet方式請求失敗"); 
 } 
} 

Post方式：

// HttpPost方式請求 
public static void requestByHttpPost() throws Exception { 
 String path = "http://www.jb51.net/"; 
 // 新建HttpPost對象 
 HttpPost httpPost = new HttpPost(path); 
 // Post參數 
 List<NameValuePair> params = new ArrayList<NameValuePair>(); 
 params.add(new BasicNameValuePair("id", "helloworld")); 
 params.add(new BasicNameValuePair("pwd", "android")); 
 // 設置字符集 
 HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8); 
 // 設置參數實體 
 httpPost.setEntity(entity); 
 // 獲取HttpClient對象 
 HttpClient httpClient = new DefaultHttpClient(); 
 // 獲取HttpResponse實例 
 HttpResponse httpResp = httpClient.execute(httpPost); 
 // 判斷是夠請求成功 
 if (httpResp.getStatusLine().getStatusCode() == HTTP_200) { 
  // 獲取返回的數據 
  String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8"); 
  Log.i(TAG_HTTPGET, "HttpPost方式請求成功，返回數據如下："); 
  Log.i(TAG_HTTPGET, result); 
 } else { 
  Log.i(TAG_HTTPGET, "HttpPost方式請求失敗"); 
 } 
} 

以上是一些部分代碼，測試的時候在測試類中運行對應的測試方法即可。完整代碼點這裡下載:源碼下載

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