Android應用經常會和伺服器端交互，這就需要手機用戶端發送網路請求，下麵介紹四種常用網路請求方式，
java.net包中的HttpURLConnection類
Get方式：
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// 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物件
URL url = new URL(path);
// 打開一個HttpURLConnection連接
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
// 設置連接逾時時間
urlConn.setConnectTimeout(5 * 1000);
// 開始連接
urlConn.connect();
// 判斷請求是否成功
if (urlConn.getResponseCode() == HTTP_200) {
// 獲取返回的資料
byte[] data = readStream(urlConn.getInputStream());
Log.i(TAG_GET, "Get方式請求成功，返回資料如下：");
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：
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// Post方式請求
public static void requestByPost() throws Throwable {
String path = "https://reg.163.com/logins.jsp";
// 請求的參數轉換為byte陣列
String params = "id=" + URLEncoder.encode("helloworld", "UTF-8")
+ "&pwd=" + URLEncoder.encode("android", "UTF-8");
byte[] postData = params.getBytes();
// 新建一個URL物件
URL url = new URL(path);
// 打開一個HttpURLConnection連接
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
// 設置連接逾時時間
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) {
// 獲取返回的資料
byte[] data = readStream(urlConn.getInputStream());
Log.i(TAG_POST, "Post請求方式成功，返回資料如下：");
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：
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// HttpGet方式請求
public static void requestByHttpGet() throws Exception {
String path = "https://reg.163.com/logins.jsp?id=helloworld&pwd=android";
// 新建HttpGet物件
HttpGet httpGet = new HttpGet(path);
// 獲取HttpClient物件
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) {
// 獲取返回的資料
String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
Log.i(TAG_HTTPGET, "HttpGet方式請求成功，返回資料如下：");
Log.i(TAG_HTTPGET, result);
} else {
Log.i(TAG_HTTPGET, "HttpGet方式請求失敗");
}
}
Post方式：
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// HttpPost方式請求
public static void requestByHttpPost() throws Exception {
String path = "https://reg.163.com/logins.jsp";
// 新建HttpPost物件
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"));
// 設置字元集
HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);
// 設置參數實體
httpPost.setEntity(entity);
// 獲取HttpClient物件
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) {
// 獲取返回的資料
String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
Log.i(TAG_HTTPGET, "HttpPost方式請求成功，返回資料如下：");
Log.i(TAG_HTTPGET, result);
} else {
Log.i(TAG_HTTPGET, "HttpPost方式請求失敗");
}
}
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