springboot和element-axios如何实现跨域请求（代码）

import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.css'
Vue.use(ElementUI)

/**
　　* 跨域设置
　　* @type {AxiosStatic}
　　*/
　　import axios from 'axios'
　　Vue.prototype.$axios = axios
　　Vue.config.productionTip = false
　　axios.defaults.withCredentials = false//这个默认即为false，如果改为true，可以传递session信息，后端要做相应修改来放行，

<template>
 <el-button @click="post">发送请求</el-button>
</template>

<script>
 import axios from "axios";
 export default {

 data() {
 return {
 activeIndex2: '1'
 };
 },
 methods: {
 handleSelect(key, keyPath) {
 console.log(key, keyPath);
 },
 post(){
 axios.get('http://localhost:8080/test')
 .then(function (response) {
 console.log(response,"已经成功发送请求！");
 })
 .catch(function (error) {
 console.log("请求失败！");
 });
 }


 }
 }
</script>

@Controller
@CrossOrigin
public class TestController {
 @RequestMapping("/test")
 @ResponseBody
 public JsonResponseExt Test(){
 System.out.println("在执行~~~~~~~~~");
 return JsonResponseExt.success("执行");
 }

}

@Configurationpublic class CorsConfig extends WebMvcConfigurerAdapter {

 @Override public void addCorsMappings(CorsRegistry registry) {
 System.out.println("----------------------");
 registry.addMapping("/**")
 .allowedOrigins("*")
 .allowCredentials(true)
 .allowedMethods("GET", "POST", "DELETE", "PUT")
 .maxAge(3600);
 }


}