Android开发中的几种网络请求方式详解

// Get方式请求 public static void requestByGet() throws Exception {  String path = "//www.VeVB.COm/logins.jsp?id=helloworld&pwd=android";  // 新建一个URL对象  URL url = new URL(path);  // 打开一个HttpURLConnection连接  HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();  // 设置连接超时时间  urlConn.setConnectTimeout(5 * 1000);  // 开始连接  urlConn.connect();  // 判断请求是否成功  if (urlConn.getResponseCode() == HTTP_200) {   // 获取返回的数据   byte[] data = readStream(urlConn.getInputStream());   Log.i(TAG_GET, "Get方式请求成功，返回数据如下：");   Log.i(TAG_GET, new String(data, "UTF-8"));  } else {   Log.i(TAG_GET, "Get方式请求失败");  }  // 关闭连接  urlConn.disconnect(); } 

// Post方式请求 public static void requestByPost() throws Throwable {  String path = "//www.VeVB.COm/logins.jsp";  // 请求的参数转换为byte数组  String params = "id=" + URLEncoder.encode("helloworld", "UTF-8")    + "&pwd=" + URLEncoder.encode("android", "UTF-8");  byte[] postData = params.getBytes();  // 新建一个URL对象  URL url = new URL(path);  // 打开一个HttpURLConnection连接  HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();  // 设置连接超时时间  urlConn.setConnectTimeout(5 * 1000);  // Post请求必须设置允许输出  urlConn.setDoOutput(true);  // Post请求不能使用缓存  urlConn.setUseCaches(false);  // 设置为Post请求  urlConn.setRequestMethod("POST");  urlConn.setInstanceFollowRedirects(true);  // 配置请求Content-Type  urlConn.setRequestProperty("Content-Type",    "application/x-www-form-urlencode");  // 开始连接  urlConn.connect();  // 发送请求参数  DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream());  dos.write(postData);  dos.flush();  dos.close();  // 判断请求是否成功  if (urlConn.getResponseCode() == HTTP_200) {   // 获取返回的数据   byte[] data = readStream(urlConn.getInputStream());   Log.i(TAG_POST, "Post请求方式成功，返回数据如下：");   Log.i(TAG_POST, new String(data, "UTF-8"));  } else {   Log.i(TAG_POST, "Post方式请求失败");  } }  

// HttpGet方式请求 public static void requestByHttpGet() throws Exception {  String path = "//www.VeVB.COm/logins.jsp?id=helloworld&pwd=android";  // 新建HttpGet对象  HttpGet httpGet = new HttpGet(path);  // 获取HttpClient对象  HttpClient httpClient = new DefaultHttpClient();  // 获取HttpResponse实例  HttpResponse httpResp = httpClient.execute(httpGet);  // 判断是够请求成功  if (httpResp.getStatusLine().getStatusCode() == HTTP_200) {   // 获取返回的数据   String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");   Log.i(TAG_HTTPGET, "HttpGet方式请求成功，返回数据如下：");   Log.i(TAG_HTTPGET, result);  } else {   Log.i(TAG_HTTPGET, "HttpGet方式请求失败");  } } 

// HttpPost方式请求 public static void requestByHttpPost() throws Exception {  String path = "//www.VeVB.COm/";  // 新建HttpPost对象  HttpPost httpPost = new HttpPost(path);  // Post参数  List<NameValuePair> params = new ArrayList<NameValuePair>();  params.add(new BasicNameValuePair("id", "helloworld"));  params.add(new BasicNameValuePair("pwd", "android"));  // 设置字符集  HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);  // 设置参数实体  httpPost.setEntity(entity);  // 获取HttpClient对象  HttpClient httpClient = new DefaultHttpClient();  // 获取HttpResponse实例  HttpResponse httpResp = httpClient.execute(httpPost);  // 判断是够请求成功  if (httpResp.getStatusLine().getStatusCode() == HTTP_200) {   // 获取返回的数据   String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");   Log.i(TAG_HTTPGET, "HttpPost方式请求成功，返回数据如下：");   Log.i(TAG_HTTPGET, result);  } else {   Log.i(TAG_HTTPGET, "HttpPost方式请求失败");  } }