Springboot+vue combination, back-end learning front-end (1)

As the saying goes, back-end engineers eventually become full-stack engineers...

Build the front-end project

Build a new vue project, see the link for details

Build the backend project

There was a little mistake here, and I couldn’t connect to the spring website. Later, I found that even this website was intermittent... I changed the url as shown in the picture... I
waited for about 10 minutes

Another problem is that the default dependency jdk is 17 for versions above spring3.0

Login interface development

front direction

Appindex

<template>
  <div>
    Hello World! 进入成功！
  </div>
</template>

<script>
export default {
    
    
  name: 'Appindex'
}
</script>

<style scoped>

</style>

login

<template>
  <div>
    用户名:<input type="text" v-model="loginForm.username" placeholder="请输入用户名"/>
    <br><br>
    密码： <input type="password" v-model="loginForm.password" placeholder="请输入密码"/>
    <br><br>
    <button v-on:click="login">登录</button>
  </div>
</template>

<script>
export default {
    
    
  name: 'Login',
  data () {
    
    
    return {
    
    
      loginForm: {
    
    
        username: '',
        password: ''
      },
      responseResult: []
    }
  },
  // 定义了登录按钮的点击方法,即向后端 /login 接口发送数据，获得成功的响应后，页面跳转到 /index。
  methods: {
    
    
    login () {
    
    
      this.$axios
        .post('/login', {
    
    
          username: this.loginForm.username,
          password: this.loginForm.password
        })
        .then(successResponse => {
    
    
          if (successResponse.data.code === 200) {
    
    
            this.$router.replace({
    
    path: '/index'})
          }
        })
        .catch(failResponse => {
    
    
        })
    }
  }

}
</script>

<style scoped>

</style>

front-end reverse proxy

import Vue from 'vue'
import App from './App'
import router from './router'
// 设置反向代理，前端请求默认发送到 http://localhost:8443/api
var axios = require('axios')
axios.defaults.baseURL = 'http://localhost:8443/api'
// 全局注册，之后可在其他组件中通过 this.$axios 发送数据
Vue.prototype.$axios = axios
Vue.config.productionTip = false

/* eslint-disable no-new */
new Vue({
    
    
  el: '#app',
  router,
  components: {
    
     App },
  template: '<App/>'
})

Because the new module axios is used, you need to enter the project folder and execute npm install --save axios to install this module

Configure page routing

src\router\index.js

import Vue from 'vue'
import Router from 'vue-router'
// 导入刚才编写的组件
import AppIndex from '@/components/home/AppIndex'
import Login from '@/components/Login'

Vue.use(Router)

export default new Router({
    
    
  routes: [
  // 下面都是固定的写法
    {
    
    
      path: '/login',
      name: 'Login',
      component: Login
    },
    {
    
    
      path: '/index',
      name: 'AppIndex',
      component: AppIndex
    }
  ]
})

cross domain support

change into

    proxyTable: {
    
    
      '/api': {
    
    
        target: 'http://localhost:8443',
        changeOrigin: true,
        pathRewrite: {
    
    
          '^/api': ''
        }
      }
    }

Startup project

There is a problem,
F12 on the whiteboard to view the reason Uncaught TypeError: Cannot set properties of undefined (setting 'baseURL')
Use the method of using axios in vue3 to report an error , and finally solve it

Second solution

Note that the address is localhost:8081/#/login, and there is this # in the middle because Vue's routing uses the Hash mode, which is a classic usage of single-page applications and can be solved in the backend

backend page

test login