Android中的几种网络请求方式详解
Android应用经常会和服务器端交互，这就需要手机客户端发送网络请求，下面介绍四种常用网络请求方式，我这边是通过Android单元测试来完成这四种方法的
java.net包中的HttpURLConnection类
Get方式：
1 // Get方式请求 2 public static void requestByGet() throws Exception { 3 String path = "https://reg.163.com/logins.jsp?id=helloworld&pwd=android"; 4 // 新建一个URL对象 5 URL url = new URL(path); 6 // 打开一个HttpURLConnection连接 7 HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); 8 // 设置连接超时时间 9 urlConn.setConnectTimeout(5 * 1000); 10 // 开始连接 11 urlConn.connect(); 12 // 判断请求是否成功 13 if (urlConn.getResponseCode() == HTTP_200) { 14 // 获取返回的数据 15 byte[] data = readStream(urlConn.getInputStream()); 16 Log.i(TAG_GET, "Get方式请求成功，返回数据如下："); 17 Log.i(TAG_GET, new String(data, "UTF-8")); 18 } else { 19 Log.i(TAG_GET, "Get方式请求失败"); 20 } 21 // 关闭连接 22 urlConn.disconnect(); 23 }
Post方式：
1 // Post方式请求 2 public static void requestByPost() throws Throwable { 3 String path = "https://reg.163.com/logins.jsp"; 4 // 请求的参数转换为byte数组 5 String params = "id=" + URLEncoder.encode("helloworld", "UTF-8") 6 + "&pwd=" + URLEncoder.encode("android", "UTF-8"); 7 byte[] postData = params.getBytes(); 8 // 新建一个URL对象 9 URL url = new URL(path); 10 // 打开一个HttpURLConnection连接 11 HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); 12 // 设置连接超时时间 13 urlConn.setConnectTimeout(5 * 1000); 14 // Post请求必须设置允许输出 15 urlConn.setDoOutput(true); 16 // Post请求不能使用缓存 17 urlConn.setUseCaches(false); 18 // 设置为Post请求 19 urlConn.setRequestMethod("POST"); 20 urlConn.setInstanceFollowRedirects(true); 21 // 配置请求Content-Type 22 urlConn.setRequestProperty("Content-Type", 23 "application/x-www-form-urlencode"); 24 // 开始连接 25 urlConn.connect(); 26 // 发送请求参数 27 DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream()); 28 dos.write(postData); 29 dos.flush(); 30 dos.close(); 31 // 判断请求是否成功 32 if (urlConn.getResponseCode() == HTTP_200) { 33 // 获取返回的数据 34 byte[] data = readStream(urlConn.getInputStream()); 35 Log.i(TAG_POST, "Post请求方式成功，返回数据如下："); 36 Log.i(TAG_POST, new String(data, "UTF-8")); 37 } else { 38 Log.i(TAG_POST, "Post方式请求失败"); 39 } 40 }
org.apache.http包中的HttpGet和HttpPost类
Get方式：
1 // HttpGet方式请求 2 public static void requestByHttpGet() throws Exception { 3 String path = "https://reg.163.com/logins.jsp?id=helloworld&pwd=android"; 4 // 新建HttpGet对象 5 HttpGet httpGet = new HttpGet(path); 6 // 获取HttpClient对象 7 HttpClient httpClient = new DefaultHttpClient(); 8 // 获取HttpResponse实例 9 HttpResponse httpResp = httpClient.execute(httpGet); 10 // 判断是够请求成功 11 if (httpResp.getStatusLine().getStatusCode() == HTTP_200) { 12 // 获取返回的数据 13 String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8"); 14 Log.i(TAG_HTTPGET, "HttpGet方式请求成功，返回数据如下："); 15 Log.i(TAG_HTTPGET, result); 16 } else { 17 Log.i(TAG_HTTPGET, "HttpGet方式请求失败"); 18 } 19 }
Post方式：
1 // HttpPost方式请求 2 public static void requestByHttpPost() throws Exception { 3 String path = "https://reg.163.com/logins.jsp"; 4 // 新建HttpPost对象 5 HttpPost httpPost = new HttpPost(path); 6 // Post参数 7 List<NameValuePair> params = new ArrayList<NameValuePair>(); 8 params.add(new BasicNameValuePair("id", "helloworld")); 9 params.add(new BasicNameValuePair("pwd", "android")); 10 // 设置字符集 11 HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8); 12 // 设置参数实体 13 httpPost.setEntity(entity); 14 // 获取HttpClient对象 15 HttpClient httpClient = new DefaultHttpClient(); 16 // 获取HttpResponse实例 17 HttpResponse httpResp = httpClient.execute(httpPost); 18 // 判断是够请求成功 19 if (httpResp.getStatusLine().getStatusCode() == HTTP_200) { 20 // 获取返回的数据 21 String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8"); 22 Log.i(TAG_HTTPGET, "HttpPost方式请求成功，返回数据如下："); 23 Log.i(TAG_HTTPGET, result); 24 } else { 25 Log.i(TAG_HTTPGET, "HttpPost方式请求失败"); 26 } 27 }