java调用http接口并返回json对象详解编程语言

 1 import java.io.BufferedReader; 
 2 import java.io.InputStreamReader; 
 3 import java.io.OutputStreamWriter; 
 4 import java.io.PrintWriter; 
 5 import java.net.URL; 
 6 import java.net.URLConnection; 
 7 import java.net.URLEncoder; 
 8 import java.util.HashMap; 
 9 import java.util.Map; 
10  
11 import javax.servlet.http.HttpServletRequest; 
12  
13 import net.sf.json.JSONObject; 
14  
15 import org.springframework.web.bind.annotation.RequestMapping; 
16 import org.springframework.web.bind.annotation.RequestMethod; 
17 import org.springframework.web.bind.annotation.ResponseBody; 
18  
19 public class Test { 
20  
21     //调用http接口 
22     @RequestMapping(value="testInterfaces.htm", method={RequestMethod.GET, RequestMethod.POST}) 
23     public void testInterfaces(HttpServletRequest request) throws Exception{ 
24         //传入中文参数并设置编码格式 
25         String param = "{/"url/":/"中文/"}"; 
26         param = URLEncoder.encode(param, "UTF-8"); 
27             PrintWriter out = null; 
28             BufferedReader in = null; 
29             String result = ""; 
30             try { 
31                URL realUrl = new URL("http://localhost/test.htm"); 
32                // 打开和URL之间的连接 
33                URLConnection conn = realUrl.openConnection(); 
34                // 发送POST请求必须设置如下两行 
35                conn.setDoOutput(true); 
36                conn.setDoInput(true); 
37                // 获取URLConnection对象对应的输出流 
38                out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(),"UTF-8")); 
39                // 发送请求参数 
40                out.print(param);           
41                // flush输出流的缓冲 
42                out.flush(); 
43                // 定义BufferedReader输入流来读取URL的响应 
44                in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8")); 
45                String line; 
46                while ((line = in.readLine()) != null) { 
47                    result += line; 
48                } 
49                //解析json对象 
50                JSONObject jsStr = JSONObject.fromObject(result); 
51                System.out.println(jsStr.get("firstName")); 
52             } catch (Exception e) { 
53                e.printStackTrace(); 
54             } 
55     } 
56  
57     //所调用的接口 
58     @RequestMapping(value = "test.htm", method = { RequestMethod.GET,RequestMethod.POST }) 
59     @ResponseBody 
60     public JSONObject test(HttpServletRequest request)throws Exception {        
61         JSONObject jsonObj = new JSONObject(); 
62         Map<String,Object> map = new HashMap<String,Object>(); 
63         map.put("firstName", "jack"); 
64         jsonObj.putAll(map); 
65         return jsonObj; 
66     } 
67  
68 }