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 }