前后端分离之VueJS前端

代码：https://github.com/jimolonely/vue-jwt-demo

前言

前端用什么框架都可以，这里选择小巧的vuejs。

要实现的功能很简单： 

1、登录功能，成功将服务器返回的token存在本地 

2、使用带token的header访问服务器的一个资源

本次实验环境：

"dependencies": {
"vue": "^2.2.1"
},
"devDependencies": {
"babel-core": "^6.0.0",
"babel-loader": "^6.0.0",
"babel-preset-latest": "^6.0.0",
"cross-env": "^3.0.0",
"css-loader": "^0.25.0",
"file-loader": "^0.9.0",
"vue-loader": "^11.1.4",
"vue-template-compiler": "^2.2.1",
"webpack": "^2.2.0",
"webpack-dev-server": "^2.2.0"
}

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开发IDE：Atom

首先建一个项目

使用webpack构建

/Atom# vue init webpack-simple vue-jwt-demo
...
/Atom# cd vue-jwt-demo/
/Atom/vue-jwt-demo# cnpm install
/Atom/vue-jwt-demo# npm run dev

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安装插件

/Atom/vue-jwt-demo# cnpm install vue-router

/Atom/vue-jwt-demo# cnpm install vue-resource

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整体目录

auth.js

完成token的存取

const SERVER_URL = 'http://localhost:8081'
const LOGIN_URL = SERVER_URL+'/login2'

export default{
data:{
authenticated:false
},
login(context,info){
context.$http.post(LOGIN_URL,info).then(function(data){
console.log(data.bodyText)
localStorage.setItem('token',data.bodyText);
this.authenticated = true
//跳到home页
this.$router.push('home')
},function(err){
console.log(err+","+err.body.message)
context.error = err.body.message
})
},
getAuthHeader(){
return {
'Authorization':'Bearer '+localStorage.getItem('token')
}
},
checkAuth(){
var token = localStorage.getItem('token')
if(token){
this.authenticated = true
}else{
this.authenticated = false
}
}
}

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main.js

程序入口：完成路由和初始化

import Vue from 'vue'
import App from './App.vue'
import Login from './component/Login.vue'
import Home from './component/Home.vue'
import VueRouter from 'vue-router'
import VueResource from 'vue-resource'
import auth from './auth/auth'

Vue.use(VueRouter)
Vue.use(VueResource)

//在启动APP时进行校验是否有token
auth.checkAuth()

const routes= [
{
path:'/',redirect:'/login'
},
{
path:'/login',component:Login
},
{
path:'/home',component:Home
}
]

const router = new VueRouter({
routes
})
new Vue({
router,
render: h => h(App)
}).$mount('#app')

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App.vue

页面载体

<template>
<div id="app">
<h1>{{msg}}</h1>
<router-view></router-view>
</div>
</template>

<script>
export default {
name: 'app',
data () {
return {
msg: 'Vue前后端分离demo'
}
}
}
</script>

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Login.vue

登录页面

<template>
<div>
<h2>登录</h2>
<p>{{ error }}</p>
<div>
<input
type="text"
placeholder="Enter your username"
v-model="info.username"
>
</div>
<div>
<input
type="password"
placeholder="Enter your password"
v-model="info.password"
>
</div>
<button @click="submit()">登录</button>
</div>
</template>

<script>
import auth from '../auth/auth'

export default {

data() {
return {
info: {
username: '',
password: ''
},
error: ''
}
},
methods: {
submit() {
var info = {
username: this.info.username,
password: this.info.password
}
auth.login(this, info)
}
}
}
</script>

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效果：丑是丑了点

Home.vue

主页面，访问一个获取邮箱的请求

<template>
<div id="home">
<h1>{{msg}}</h1>
<button @click="getEmail()">Get Email</button>
<h2>Email:{{email}}</h2>
</div>
</template>

<script>
import auth from '../auth/auth'

export default {
name: 'home',
data () {
return {
msg: '欢迎您登录成功',
email:''
}
},
beforeCreate(){
//如果没有token的话需要重新登录
if(!auth.authenticated){
this.$router.push('login')
}
},
methods:{
getEmail(){
this.$http.get('http://localhost:8081/user/getEmail',{
headers:auth.getAuthHeader()
}).then(function(re){
this.email = re.bodyText
},function(){
console.log("get email error")
})
}
}
}
</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;
}

h1, h2 {
font-weight: normal;
}

a {
color: #42b983;
}
</style>

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对应在服务端：

@GetMapping("/getEmail")
public String getEmail() {
return "xxxx@qq.com";
}

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可看到浏览器的本地存储：



参考： 
https://github.com/auth0-blog/vue-jwt-authentication（基于vue1.x） 
https://router.vuejs.org/zh-cn/essentials/getting-started.html