How springboot and element-axios implement cross-domain requests (code)

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1. Initialize element project
1.1: vue init webpage 'Project name'
1.2: npm i element-ui -S
1.3: In main.js Add

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

2. Add axios cross-domain request

Add

/**
　　* 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，

# in main.js

##3. Create a page

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

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

    data() {
      return {
        activeIndex2: &#39;1&#39;
      };
    },
    methods: {
      handleSelect(key, keyPath) {
        console.log(key, keyPath);
      },
      post(){
        axios.get(&#39;http://localhost:8080/test&#39;)
          .then(function (response) {
            console.log(response,"已经成功发送请求！");
          })
          .catch(function (error) {
            console.log("请求失败！");
          });
      }


    }
  }
</script>

4. Create a springboot project

4.1 Add a controller class

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

}

JsonResponseExt is a class encapsulated by myself. You can directly return an object or a string.

In addition, the @CrossOrigin annotation must be added to the controller class, otherwise the front-end return result will report an error

You can also encapsulate a configuration class yourself, for example

@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);
    }


}

5, test results

##Related recommendations:

How axios requests cross domains

vue-cli axios requests and cross-domain

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