spring boot + vue 前后分离实现登录功能（一）

使用webpack 打包初始化项目

vue init webpack book-vue

---

进入工程目录

cd hello-vue

安装 vue-router

npm install vue-router --save-dev

安装 element-ui

npm i element-ui -S

安装 SASS 加载器

npm install sass-loader node-sass --save-dev

---

下载依赖

npm install

启动工程

npm run dev

---

浏览器输入 http://localhost:8080

---

使用VS Code 打开项目（随便一款IDE打开即可）

---

新建几个目录文件

---

新建 views/Login.vue

<template>
  <div>
    <el-form ref="loginForm" :model="form" :rules="rules" label-width="80px" class="login-box">
      <h3 class="login-title">欢迎登录</h3>
      <el-form-item label="账号" prop="username">
        <el-input type="text" placeholder="请输入账号" v-model="form.username"/>
      </el-form-item>
      <el-form-item label="密码" prop="password">
        <el-input type="password" placeholder="请输入密码" v-model="form.password"/>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" v-on:click="onSubmit('loginForm')">登录</el-button>
      </el-form-item>
    </el-form>

    <el-dialog
      title="温馨提示"
      :visible.sync="dialogVisible"
      width="30%"
      :before-close="handleClose">
      <span>请输入账号和密码</span>
      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="dialogVisible = false">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data() {
      return {
        form: {
          username: '',
          password: ''
        },

        // 表单验证，需要在 el-form-item 元素中增加 prop 属性
        rules: {
          username: [
            {required: true, message: '账号不可为空', trigger: 'blur'}
          ],
          password: [
            {required: true, message: '密码不可为空', trigger: 'blur'}
          ]
        },

        // 对话框显示和隐藏
        dialogVisible: false
      }
    },
    methods: {
      onSubmit(formName) {
        // 为表单绑定验证功能
        this.$refs[formName].validate((valid) => {
          if (valid) {
            // 使用 vue-router 路由到指定页面，该方式称之为编程式导航
            this.$router.push("/main");
          } else {
            this.dialogVisible = true;
            return false;
          }
        });
      }
    }
  }
</script>

<style lang="scss" scoped>
  .login-box {
    border: 1px solid #DCDFE6;
    width: 350px;
    margin: 180px auto;
    padding: 35px 35px 15px 35px;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    box-shadow: 0 0 25px #909399;
  }

  .login-title {
    text-align: center;
    margin: 0 auto 40px auto;
    color: #303133;
  }
</style>

新建 views/Main.vue

<template>
    <div>
      首页
    </div>
</template>

<script>
    export default {
        name: "Main"
    }
</script>

新建 router/index.js

import Vue from 'vue'
import Router from 'vue-router'

import Login from '../views/Login'
import Main from '../views/Main'

Vue.use(Router);

export default new Router({
    
  routes: [
    {
      // 登录页
      path: '/login',
      name: 'Login',
      component: Login
    },
    {
      // 首页
      path: '/main',
      name: 'Main',
      component: Main
    }
  ]
});

修改 App.vue

<template>
  <div id="app">
    <router-view/>
  </div>
</template>

<script>
  export default {
    name: 'App',
  }
</script>

<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

修改 main.js

import Vue from 'vue'
import VueRouter from 'vue-router'
import router from './router'

// 导入 ElementUI
import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.css'

import App from './App'

// 安装路由
Vue.use(VueRouter);

// 安装 ElementUI
Vue.use(ElementUI);

new Vue({
  el: '#app',
  // 启用路由
  router,
  // 启用 ElementUI
  render: h => h(App)
});

浏览器输入 ： http://localhost:8080/#/login

---

未完待续