java调用http接口并返回json对象

 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     //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 }

原文地址：https://www.cnblogs.com/xiaoyue1606bj/p/11577266.html