support duo datasource

svc-provider/src/main/java/com/nju/svcprovider/controller/Controller.java

 package com.nju.svcprovider.controller;
 
 import com.nju.svcprovider.vo.ResponseVO;
+import org.springframework.web.bind.annotation.CrossOrigin;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RestController;
 
+@CrossOrigin
 @RestController
 public class Controller {