java中根据调用后台URL得到返回的值(在网页上显示的结果)

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在测试项目的时候，第一次请求会报链接超时，建议换种方式！

java中根据URL得到返回的值:

Junit单元测试代码:

public void test(){//参数StringBuffer sb=new StringBuffer("params=[{");sb.append("categoryId:"+1);sb.append(",moduleId:"+1);sb.append(",package_base_id:"+1);sb.append(",exercise_base_id:"+1);sb.append(",username:"+"test84");sb.append("},{");sb.append("categoryId:"+1);sb.append(",moduleId:"+1);sb.append(",package_base_id:"+1);sb.append(",exercise_base_id:"+2);sb.append(",username:"+"test84");sb.append("}]");String str=sb.toString();//调用地址String path="http://s.wanxue.cn/sls/stemAPIController/getLearningStemList";String msg =TransInterface.getMsg(str, path);//转换成JSONObject对象JSONObject jsonObject = JSONObject.fromObject(msg);System.out.println(jsonObject);}

TransInterface代码:

package com.unionx.wanxue.utils;import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class TransInterface {public static String getMsg(String jsonStr,String path){URL url = null;HttpURLConnection httpurlconnection = null;String str=null;try{url = new URL(path);httpurlconnection = (HttpURLConnection) url.openConnection();httpurlconnection.setDoOutput(true);httpurlconnection.setRequestMethod("POST");String userid = jsonStr;httpurlconnection.getOutputStream().write(userid.getBytes());httpurlconnection.getOutputStream().flush();httpurlconnection.getOutputStream().close();int code = httpurlconnection.getResponseCode();//http状态码，200正常System.out.println("code   " + code);java.io.InputStream in= httpurlconnection .getInputStream();java.io.BufferedReader breader =new BufferedReader(new InputStreamReader(in , "utf-8"));str=breader.readLine();}catch(Exception e){e.printStackTrace();}finally{if(httpurlconnection!=null)httpurlconnection.disconnect();}return str;}}

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