SpringBoot结合Vue3实现简单的前后端交互

npm create vue@latest
> cd <your-project-name>
> npm install
> npm run dev

import './assets/main.css'
import { createApp } from 'vue'
import App from './App.vue'
import router  from '@/router'
//import axios from 'axios'
// console.log(App)
const app = createApp(App)
//app.config.globalProperties.$axios = axios
app.use(router)
// app.use(axios)
app.mount('#app')

<template>
    <div id="app">
      <!-- App跟组件 -->
      <router-view></router-view>
    </div>
</template>
<script setup>
    name: 'app'
</script>
<style scoped>
</style>

import { createRouter,createWebHistory } from 'vue-router'
import Login from '../components/Login.vue' //引用Login组件
const routes = [
    {path: '/',redirect: '/login'},
    {path: '/login',component: Login}, //定义访问页面的路由地址
]
const router = createRouter({
    history:createWebHistory(),
    routes,
})
export default router

import axios from 'axios'
//创建axios实例
const axiosInstance = axios.create({
    //api的BaseUrl 
    baseURL : '/aa',
    setTimeout: 5000, //设置超时时间
    responseType: 'json',
    withDefaults : true, //是否允许带cookie这些
    headers: {
        'Content-Type' : 'application/json;charset=utf-8',
        'x-token' : '777'
    }
});
export default axiosInstance

<template>
  <header>
    <img alt="Vue logo" class="logo" src="../assets/logo.svg" width="125" height="125" />
    <div class="wrapper">
        登录组件:
        {{ msg }}
        <button onclick="login"> axios</button>
    </div>
  </header>
</template>
<script>
import axiosInstance from '../utils/Axios'
  export default {
      data(){
          return {
            msg : '开始'
          }
      },
      mounted(){
        axiosInstance.get('login/login')
        .then(response =>{
            //处理响应数据
            console.log(response.data);
            this.msg = response.data;
        })
        .catch(error =>{
            //处理错误消息
            console.error(error);
        })
      }
  }
</script>
<!-- 支持less语法格式 scoped代表样式只在本组件中起作用 lang="less" -->
<style scoped>
</style>

import { fileURLToPath, URL } from 'node:url'
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import path from 'node:path'
// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    vue(),
  ],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    }
  },
  server: {
      proxy: {
        //需要代理的路径
        '/aa': {
            //目标服务器的地址
            target: 'http://localhost:9100/',
            //是否要将请求中的路径重写
            rewrite: path => path.replace(/^\/api/,''),
            //是否要改变代理的源地址
            changeOrigin: true,
            //其他可选的代理配置
        }
      }
  }
})

  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

@RestController
@RequestMapping("/login")
public class Login {
    @RequestMapping("/login")
    public String login(){
        return "登录成功";
    }
}