代码地址:https://github.com/opendingtalk/eapp-isv-quick-start-java/blob/master/src/main/java/com/controller/CallbackController.java
package com.controller;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.config.Constant;
import com.dingtalk.oapi.lib.aes.DingTalkEncryptException;
import com.dingtalk.oapi.lib.aes.DingTalkEncryptor;
import com.dingtalk.oapi.lib.aes.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.spri