SpringBoot3 + Vue3 由浅入深的交互基础交互教学

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/db_demo
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 1234

server:
  port: 8080

1.2前端配置：

要创建utils、api、router、views文件夹

1.2.1安装相应的依赖:

npm install axios

npm install element-plus --save

npm install vue-router@4

1.2.2utils/request.js:

import axios from "axios";
 
const baseURL = '/api';
 
const instance = axios.create({baseURL})
 
instance.interceptors.response.use(
    result=>{
        return result.data;
    },
    err=>{
        alert('服务错误');
        return Promise.reject(err);
    }
 
)
 
export default instance;

1.2.3api/user.js:

注意：api里的js文件名和文件内容，要根据实际的接口文档写，这里先写了一个打印功能的接口，方便教学

import request from '@/utils/request.js'

export const userHelloService = ()=>{
    return request.get('/user/hello')
}

1.2.4router/index.js:

注意：别忘记在views文件夹下创建Login.vue和Layout.vue（本次教学没用到）

import { createRouter,createWebHistory } from "vue-router";
 
import LoginVue from '@/views/Login.vue'
import LayoutVue from '@/views/Layout.vue'

//定义路由关系
const routes = [
    { path:'/login',component:LoginVue},
    { path:'/',component:LayoutVue}
]
 
//创建路由器
const router = createRouter({
    history: createWebHistory(),
    routes: routes
})
 
export default router

1.2.5main.js:

import './assets/main.css'

import { createApp } from 'vue'
import App from './App.vue'
import router from '@/router'
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'

const app = createApp(App);
app.use(router)
app.use(ElementPlus)
app.mount('#app')

1.2.6vite.config.js:

注意：target里的url要根据后端的端口号进行修改

import { fileURLToPath, URL } from 'node:url'

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    vue(),
  ],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    }
  },
  server:{
    proxy:{
      '/api':{
        target:'http://localhost:8080',
        changeOrigin:true,
        rewrite:(path)=>path.replace(/^\/api/,'')
      }
    }
  }
})

二、从打印一个字符串开始

2.1 后端：

2.1.1 Controller:

启动该SpringBoot项目后，通过Get方式访问locahost:8080/user/hello，就会返回"Hello World! 2024 year"字符串

package com.example.test_demo.Controller;


import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("user")
public class UserController {

    @GetMapping("/hello")
    public String hello(){
        return "Hello World! 2024 year";
    }
    

}

2.2前端：

2.2.1api/user.js:

import request from '@/utils/request.js'

export const userHelloService = ()=>{
    return request.get('/user/hello')
}

2.2.2App.vue:

为了方便演示，我直接在App.vue（Vue.js 项目的入口文件）中输出后端传递的字符串

<script setup>
import {ref} from 'vue'

import { userHelloService } from './api/user.js';

const variable1 = ref('')
const hello = async()=>{
  let result = await userHelloService();
  variable1.value = result
 
}

function clear(){
  variable1.value = ''
}
</script>

<template>
  <el-button type="default" @click="hello" style="margin-top:10px">Hello</el-button>
  <el-button type="primary" @click="clear" style="margin-top:10px">清空</el-button>
  <h1>输出:{{variable1}}</h1>
</template>

<style scoped>

</style>

2.3 实现效果：

点击Hello按钮时，打印后端返回的字符串"Hello World! 2024 year"

三、实现登录功能（多个参数的传递）

想要实现登录功能，那么在页面输入的username（用户名）和password（密码）信息要传递到后端，这样后端才能调用数据库进行验证该用户信息是否存在

3.1后端：

3.1.1 Controller:

package com.example.test_demo.Controller;


import com.example.test_demo.pojo.User;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("user")
public class UserController {

    @GetMapping("/hello")
    public String hello(){
        return "Hello World! 2024 year";
    }

    @PostMapping("/login")
    public String login(String username,String password){
        System.out.println("用户名:"+username);
        System.out.println("密码:"+password);

        return "用户名:"+username+"\n密码:"+password;
    }

}

3.2前端：

3.2.1api/user.js:

import request from '@/utils/request.js'

export const userHelloService = ()=>{
    return request.get('/user/hello')
}

export const userLoginService = (loginData)=>{
    const params = new URLSearchParams();
    for(let key in loginData){
        params.append(key,loginData[key])
    }
    return request.post('/user/login',params)
}

3.2.2App.vue:

<script setup>
import {ref} from 'vue'

import { userHelloService, userLoginService } from './api/user.js';

const variable1 = ref('')
const hello = async()=>{
  let result = await userHelloService();
  variable1.value = result
 
}

function clear(){
  variable1.value = ''
}



 const loginData = ref({
    username: '',
    password: ''
   
})

const login = async()=>{
  let result = await userLoginService(loginData.value);
  alert(result)
  
}


</script>

<template>
  <el-button type="default" @click="hello" style="margin-top:10px">Hello</el-button>
  <el-button type="primary" @click="clear" style="margin-top:10px">清空</el-button>
  <h1>输出:{{variable1}}</h1>
  <el-input v-model="loginData.username" placeholder="Please username" />
  <el-input v-model="loginData.password" placeholder="Please password" />
  <el-button type="primary" @click="login" style="margin-top:10px">登录</el-button>
  <h1>username:{{loginData.username}}</h1>
  <h1>password:{{loginData.password}}</h1>

</template>

<style scoped>

.el-input{
  width: 200px;
  display: flex;
  justify-items: flex-start;
}
</style>

3.3 实现效果：

在页面输入用户名和密码后点击登录按钮，弹出登录用户信息后点击确认

后端显示：

可以看到后端接收到页面输入的登录信息了

四、单个参数传递

我们常常需要获取单个参数进行查询或者校验，例如，我们想通过获取id来查询信息，或者获取某一类的名字来查询该类的内容，这时候就需要传递单个参数信息了

4.1后端：

4.1.1 Controller:

package com.example.test_demo.Controller;


import com.example.test_demo.pojo.User;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("user")
public class UserController {

    @GetMapping("/hello")
    public String hello(){
        return "Hello World! 2024 year";
    }

    @PostMapping("/login")
    public String login(String username,String password){
        System.out.println("用户名:"+username);
        System.out.println("密码:"+password);

        return "用户名:"+username+"\n密码:"+password;
    }

    @DeleteMapping("/{id}")
    public String delete(@PathVariable Integer id){
        System.out.println("获取删除的id="+id);
        return "删除 id="+id+"的用户信息";
    }
}

4.2 前端：

4.2.1api/user.js:

import request from '@/utils/request.js'

export const userHelloService = ()=>{
    return request.get('/user/hello')
}

export const userLoginService = (loginData)=>{
    const params = new URLSearchParams();
    for(let key in loginData){
        params.append(key,loginData[key])
    }
    return request.post('/user/login',params)
}

export const userDeletService = (id)=>{
    return request.delete('user/'+id)
}

4.2.2App.vue:

<script setup>
import {ref} from 'vue'

import { userDeletService, userHelloService, userLoginService } from './api/user.js';

const variable1 = ref('')
const hello = async()=>{
  let result = await userHelloService();
  variable1.value = result
 
}

function clear(){
  variable1.value = ''
}



 const loginData = ref({
    username: '',
    password: ''
   
})

const login = async()=>{
  let result = await userLoginService(loginData.value);
  
}

const id = ref()
const deleteById = async()=>{
  let result = await userDeletService(id.value);
  id.value = result
}


</script>

<template>
  <el-button type="default" @click="hello" style="margin-top:10px">Hello</el-button>
  <el-button type="primary" @click="clear" style="margin-top:10px">清空</el-button>
  <h1>输出:{{variable1}}</h1>
  <el-input v-model="loginData.username" placeholder="Please username" />
  <el-input v-model="loginData.password" placeholder="Please password" />
  <el-button type="primary" @click="login" style="margin-top:10px">登录</el-button>
  <h1>username:{{loginData.username}}</h1>
  <h1>password:{{loginData.password}}</h1>
  输入删除的ID:<el-input v-model="id" placeholder="Please deleteId" />
  <el-button type="danger" @click="deleteById" style="margin-top:10px">删除</el-button>
  <h1>deleteById:{{id}}</h1>

</template>

<style scoped>

.el-input{
  width: 200px;
  display: flex;
  justify-items: flex-start;
}
</style>

SpringBoot3 + Vue3 由浅入深的交互 基础交互教学

一、创建一个SpringBoot3项目的和Vue3项目并进行配置

1.1后端配置:

1.1.1application.yml: