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，下面整理四種常用網絡請求方式。

java.net包中的HttpURLConnection類

Get方式：

// Get方式請求

public static void requestByGet() throws Exception {

String path = "https://reg.163.com/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() throwsThrowable {

String path= "https://reg.163.com/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 = newURL(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 = newDataOutputStream(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() throwsException {

String path= "https://reg.163.com/logins.jsp?id=helloworld&pwd=android";//新建HttpGet對象

HttpGet httpGet = newHttpGet(path);//獲取HttpClient對象

HttpClient httpClient = newDefaultHttpClient();//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() throwsException {

String path= "https://reg.163.com/logins.jsp";//新建HttpPost對象

HttpPost httpPost = newHttpPost(path);//Post參數

List params = new ArrayList();

params.add(new BasicNameValuePair("id", "helloworld"));

params.add(new BasicNameValuePair("pwd", "android"));//設置字符集

HttpEntity entity = newUrlEncodedFormEntity(params, HTTP.UTF_8);//設置參數實體

httpPost.setEntity(entity);//獲取HttpClient對象

HttpClient httpClient = newDefaultHttpClient();//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");

}

}