java調用http接口並返回json對象

 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     //調用http接口
22     @RequestMapping(value="testInterfaces.htm", method={RequestMethod.GET, RequestMethod.POST})
23     public void testInterfaces(HttpServletRequest request) throws Exception{
24         //傳入中文參數並設置編碼格式
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                // 打開和URL之間的鏈接
33                URLConnection conn = realUrl.openConnection();
34                // 發送POST請求必須設置以下兩行
35                conn.setDoOutput(true);
36                conn.setDoInput(true);
37                // 獲取URLConnection對象對應的輸出流
38                out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(),"UTF-8"));
39                // 發送請求參數
40                out.print(param);          
41                // flush輸出流的緩衝
42                out.flush();
43                // 定義BufferedReader輸入流來讀取URL的響應
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對象
50                JSONObject jsStr = JSONObject.fromObject(result);
51                System.out.println(jsStr.get("firstName"));
52             } catch (Exception e) {
53                e.printStackTrace();
54             }
55     }
56 
57     //所調用的接口
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 }