java WebService接口调用，传JSON参数

1. 转自：http://zheyiw.iteye.com/blog/1571222
   
2. 
   
3. 
   
4. 
   
5. import java.io.IOException;  
6. import java.io.InputStream;  
7. import java.io.OutputStreamWriter;  
8. import java.net.HttpURLConnection;  
9. import java.net.URL;  
10.   
11. public class Copy_2_of_PostDemo {  
12.   
13.     final static String url = "";  
14.     final static String params = "{\"id\":\"12345\"}";  
15.   
16.     /** 
17.      * 发送HttpPost请求 
18.      *  
19.      * @param strURL 
20.      *            服务地址 
21.      * @param params 
22.      *            json字符串,例如: "{ \"id\":\"12345\" }" ;其中属性名必须带双引号<br/> 
23.      * @return 成功:返回json字符串<br/> 
24.      */  
25.     public static String post(String strURL, String params) {  
26.         System.out.println(strURL);  
27.         System.out.println(params);  
28.         try {  
29.             URL url = new URL(strURL);// 创建连接  
30.             HttpURLConnection connection = (HttpURLConnection) url  
31.                     .openConnection();  
32.             connection.setDoOutput(true);  
33.             connection.setDoInput(true);  
34.             connection.setUseCaches(false);  
35.             connection.setInstanceFollowRedirects(true);  
36.             connection.setRequestMethod("POST"); // 设置请求方式  
37.             connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式  
38.             connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式  
39.             connection.connect();  
40.             OutputStreamWriter out = new OutputStreamWriter(  
41.                     connection.getOutputStream(), "UTF-8"); // utf-8编码  
42.             out.append(params);  
43.             out.flush();  
44.             out.close();  
45.             // 读取响应  
46.             int length = (int) connection.getContentLength();// 获取长度  
47.             InputStream is = connection.getInputStream();  
48.             if (length != -1) {  
49.                 byte[] data = new byte[length];  
50.                 byte[] temp = new byte[512];  
51.                 int readLen = 0;  
52.                 int destPos = 0;  
53.                 while ((readLen = is.read(temp)) > 0) {  
54.                     System.arraycopy(temp, 0, data, destPos, readLen);  
55.                     destPos += readLen;  
56.                 }  
57.                 String result = new String(data, "UTF-8"); // utf-8编码  
58.                 System.out.println(result);  
59.                 return result;  
60.             }  
61.         } catch (IOException e) {  
62.             // TODO Auto-generated catch block  
63.             e.printStackTrace();  
64.         }  
65.         return "error"; // 自定义错误信息  
66.     }  
67.   
68.     public static void main(String[] args) {  
69.         post(url, params);  
70.     }  
71.   
72. }