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 }