小程序换取openId

  1 package com.shanxilgong.linxi.controllers;
  2 
  3 import com.alibaba.fastjson.JSON;
  4 import com.alibaba.fastjson.JSONObject;
  5 import com.shanxilgong.linxi.listener.MyTimerTask;
  6 import org.apache.catalina.servlet4preview.http.HttpServletRequest;
  7 import org.apache.http.HttpEntity;
  8 import org.apache.http.HttpResponse;
  9 import org.apache.http.client.HttpClient;
 10 import org.apache.http.client.methods.HttpGet;
 11 import org.apache.http.impl.client.DefaultHttpClient;
 12 import org.apache.http.util.EntityUtils;
 13 import org.slf4j.Logger;
 14 import org.slf4j.LoggerFactory;
 15 import org.springframework.beans.factory.annotation.Value;
 16 import org.springframework.web.bind.annotation.RequestMapping;
 17 import org.springframework.web.bind.annotation.RequestMethod;
 18 import org.springframework.web.bind.annotation.RequestParam;
 19 import org.springframework.web.bind.annotation.RestController;
 20 
 21 import javax.servlet.http.HttpServletResponse;
 22 import javax.servlet.http.HttpSession;
 23 import java.io.IOException;
 24 import java.util.Map;
 25 
 26 import static com.shanxilgong.linxi.tokenManager.TokenManager.tokenManager;
 27 
 28 /**
 29  * 该接口用于换取openId，进行用户状态维护
 30  * 1、在进行参数绑定时，默认是必填参数。
 31  * 2、微信小程序侧在传递参数时，使用Get方法，
 32  *    将wx.login()获取到的临时凭证拼接值url后面
 33  *
 34  * 小程序当前实现逻辑：
 35  *      小程序页签每次进入到“我的”页签都会自动登录。
 36  *
 37  *    返回值： {"session_key":"JHdZspvydvulDWF8BnfUew==","expires_in":7200,"openid":"oGo8D0RMEW4KK55RMOpQR2XaJQA8"}
 38  *    过期时间，单位为秒，1小时=1*60*60  过期时间是2小时
 39  */
 40 @RestController
 41 @RequestMapping(value = {"/login"},method = RequestMethod.GET)
 42 public class LoginGetInfo
 43 {
 44     // Spring boot 里面本身已经集成了 log4j 的jar相关
 45     private static Logger logger = LoggerFactory.getLogger(LoginGetInfo.class);
 46 
 47     @Value("${appid}")
 48     private String appid;
 49 
 50     @Value("${secret}")
 51     private String secret;
 52 
 53     private static final  String URL =
 54             "https://api.weixin.qq.com/sns/jscode2session?" +
 55                     "appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code";
 56 
 57     @RequestMapping(value = {"/getInfo"})
 58     public JSONObject getInfo(@RequestParam(value = "data") String  js_code,
 59                               HttpServletRequest request, HttpServletResponse response)
 60     {
 61 
 62         JSONObject result = new JSONObject();
 63         HttpClient httpClient=new DefaultHttpClient();
 64         HttpGet httpGet = new HttpGet(
 65                 URL.replace("APPID",appid)
 66                         .replace("SECRET",secret)
 67                         .replace("JSCODE",js_code));
 68         try
 69         {
 70             HttpResponse resp =  httpClient.execute(httpGet);
 71             if(200 != resp.getStatusLine().getStatusCode())
 72             {
 73                 logger.error("execute request of get is error.");
 74                 result.put("code","-1");
 75                 result.put("msg","error");
 76                 return result;
 77             }
 78             HttpEntity entity=resp.getEntity();
 79             String msg= EntityUtils.toString(entity,"utf-8");
 80             JSONObject json = JSON.parseObject(msg);
 81             String openId = json.getString("openid"); // 拿到当前用户在微信服务器的唯一凭证
 82 
 83             // 在token缓存中去查看当前用户的凭证是否已经存在
 84             if (!tokenManager.containsKey(openId))
 85             {
 86                 // 添加用户凭证
 87                 tokenManager.put(openId,true);
 88             }
 89         }
 90         catch (IOException e)
 91         {
 92             logger.error("execute request of get is error.");
 93             result.put("code","-1");
 94             result.put("msg","error");
 95             return result;
 96         }
 97         result.put("code","0");
 98         result.put("msg","success");
 99         return result;
100     }
101 }