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 = "https://www.jb51.net/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 = "https://www.jb51.net/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 = "https://www.jb51.net/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 = "https://www.jb51.net/"; 
 // 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"); 
 } 
}