SPA实现前后台分离之登录

SPA实现前后台分离之登录

  • 前期准备
  • vue项目加入其它内库
  • 重要配置
    • 前端
    • 后台:
  • 后台交互(axios/qs/vue-axios)
  • 测试效果

前期准备

我们需要提前创建一个vue项目,并且下载好elment-ui
执行:npm install element-ui -S
还有准备一个登录界面 Login.vue

博文写的不是很清晰,博主这里准备了一些博文让您跟好的理解。嘻嘻

SPA技术

<template>
	<div class="login-wrap">
		<el-form :model="ruleForm" label-width="100px" class="demo-ruleForm login-container">
			<h2 style="text-align: center;">用户登录</h2>
			<el-form-item label="用户名">
				<el-input v-model="ruleForm.uname"></el-input>
			</el-form-item>

			<el-form-item label="密码">
				<el-input type="password" v-model="ruleForm.pwd"></el-input>
			</el-form-item>

			<el-form-item>
				<el-row>
					<el-col :span="24">
						<div class="grid-content bg-purple-dark">
							<el-button type="primary" @click="doLogin" style="width: 100%;">提交</el-button>
						</div>
					</el-col>
				</el-row>
				<el-row>
					<el-col :span="12">
						<div class="grid-content bg-purple-dark">
							<el-link type="success" @click="toReg">用户注册</el-link>
						</div>
					</el-col>
				</el-row>
				<el-row>
					<el-col :span="12">
						<div class="grid-content bg-purple-dark">
							<el-link type="success">忘记密码</el-link>
						</div>
					</el-col>
				</el-row>
			</el-form-item>
		</el-form>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				ruleForm: {
					uname: '',
					pwd: ''
				}
			};
		},
		methods: {
			toReg() {
				this.$router.push({
					path: '/Reg'
				})
			},
			doLogin() {
				let url = this.axios.urls.SYSTEM_USER_DOLOGIN;
				console.log(url)
				this.axios.get(url, {
					params: this.ruleForm
				}).then((response) => {
					console.log(response);
					if(response.data.code == 1){
						 this.$message({
							  showClose:true,
								message: response.data.msg,
								type: 'success'
							});
					}else{
						this.$message({
							showClose:true,
							message: response.data.msg,
							type: 'error'
						});
					}
					

				}).catch((response) => {
					console.log(response);

				});
			}

		}

	}
</script>

<style scoped>
	.login-wrap {
		box-sizing: border-box;
		width: 100%;
		height: 100%;
		padding-top: 10%;
		background-image: url(data:image/svg+xml;
		base64, <?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg width="1361px" height="609px" viewBox="0 0 1361 609" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 46.2 (44496) - http://www.bohemiancoding.com/sketch -->
    <title>Group 21</title>
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Ant-Design-Pro-3.0" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="账户密码登录-校验" transform="translate(-79.000000, -82.000000)">
            <g id="Group-21" transform="translate(77.000000, 73.000000)">
                <g id="Group-18" opacity="0.8" transform="translate(74.901416, 569.699158) rotate(-7.000000) translate(-74.901416, -569.699158) translate(4.901416, 525.199158)">
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                    </g>
                </g>
                <g id="Group-14" transform="translate(216.294700, 123.725600) rotate(-5.000000) translate(-216.294700, -123.725600) translate(106.294700, 35.225600)">
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                    </g>
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            </g>
        </g>
    </g>
</svg>);
		/* background-color: #112346; */
		background-repeat: no-repeat;
		background-position: center right;
		background-size: 100%;
	}

	.login-container {
		border-radius: 10px;
		margin: 0px auto;
		width: 350px;
		padding: 30px 35px 15px 35px;
		background: #fff;
		border: 1px solid #eaeaea;
		text-align: left;
		box-shadow: 0 0 20px 2px rgba(0, 0, 0, 0.1);
	}

	.title {
		margin: 0px auto 40px auto;
		text-align: center;
		color: #505458;
	}
</style>

加入到路由

import Vue from 'vue'
import Router from 'vue-router'
import HelloWorld from '@/components/HelloWorld'
import Login from '@/views/Login'
import Reg from '@/views/Reg'

Vue.use(Router)

export default new Router({
	routes: [{
			path: '/',
			name: 'Login',
			component: Login
		},
		{
			path: '/Login',
			name: 'Login',
			component: Login,
		},

		{
			path: '/Reg',
			name: 'Reg',
			component: Reg,
		}
	]
})

挂载:

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from 'vue'
import 'element-ui/lib/theme-chalk/index.css'
import App from './App'
import router from './router'
import ElementUI from 'element-ui' 
import axios from '@/api/http' 
import VueAxios from 'vue-axios'

Vue.use(ElementUI)
Vue.use(VueAxios,axios)
Vue.config.productionTip = false

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

查看效果:

SPA实现前后台分离之登录_第1张图片

vue项目加入其它内库

解决跨域问题:npm install axios -S

是在axios基础上扩展的插件:npm install vue-axios -S

qs.js它是一个url参数转化的js库:npm install qs -S

根据上面的流程将这三个js库全部下载

如果下载完毕的话,就会出现在下面,但是没有的话就是没有下载成功

SPA实现前后台分离之登录_第2张图片

重要配置

前端

SPA实现前后台分离之登录_第3张图片

http.js

/**
 * vue项目对axios的全局配置
 */
import axios from 'axios'
import qs from 'qs'

//引入action模块,并添加至axios的类属性urls上
import action from '@/api/action'
axios.urls = action

// axios默认配置
axios.defaults.timeout = 10000; // 超时时间
// axios.defaults.baseURL = 'http://localhost:8080/j2ee15'; // 默认地址
axios.defaults.baseURL = action.SERVER;

//整理数据
// 只适用于 POST,PUT,PATCH,transformRequest` 允许在向服务器发送前,修改请求数据
axios.defaults.transformRequest = function(data) {
	data = qs.stringify(data);
	return data;
};


// 请求拦截器
axios.interceptors.request.use(function(config) {
	// var jwt = window.vm.$store.getters.getJwt;
	// config.headers['jwt'] = jwt;
	return config;
}, function(error) {
	return Promise.reject(error);
});

// 响应拦截器
axios.interceptors.response.use(function(response) {
	// debugger;
	// var jwt = response.headers['jwt'];
	// if(jwt){
	// 	window.vm.$store.commit('setJwt',{jwt:jwt});
	// }
	return response;
}, function(error) {
	return Promise.reject(error);
});

// // 路由请求拦截
// // http request 拦截器
// axios.interceptors.request.use(
// 	config => {
// 		//config.data = JSON.stringify(config.data);  
// 		//config.headers['Content-Type'] = 'application/json;charset=UTF-8';
// 		//config.headers['Token'] = 'abcxyz';
// 		//判断是否存在ticket,如果存在的话,则每个http header都加上ticket
// 		// if (cookie.get("token")) {
// 		// 	//用户每次操作,都将cookie设置成2小时
// 		// 	cookie.set("token", cookie.get("token"), 1 / 12)
// 		// 	cookie.set("name", cookie.get("name"), 1 / 12)
// 		// 	config.headers.token = cookie.get("token");
// 		// 	config.headers.name = cookie.get("name");
// 		// }
// 		return config;
// 	},
// 	error => {
// 		return Promise.reject(error.response);
// 	});

// // 路由响应拦截
// // http response 拦截器
// axios.interceptors.response.use(
// 	response => {
// 		if (response.data.resultCode == "404") {
// 			console.log("response.data.resultCode是404")
// 			// 返回 错误代码-1 清除ticket信息并跳转到登录页面
// 			//      cookie.del("ticket")
// 			//      window.location.href='http://login.com'
// 			return
// 		} else {
// 			return response;
// 		}
// 	},
// 	error => {
// 		return Promise.reject(error.response) // 返回接口返回的错误信息
// 	});



export default axios;

action.js

/**
 * 对后台请求的地址的封装,URL格式如下:
 * 模块名_实体名_操作
 */
export default {
	'SERVER': 'http://localhost:8080/T216_SSH', //服务器
	'SYSTEM_USER_DOLOGIN': '/vue/userAction_login.action', //用户登陆
	'SYSTEM_USER_DOREG': '/vue/userAction_reg.action', //用户注册
	'SYSTEM_MENU_TREE': '/vue/treeNodeAction.action', //左侧树形菜单加载
	'SYSTEM_ARTICLE_LIST': '/vue/articleAction_list.action', //文章列表
	'SYSTEM_ARTICLE_ADD': '/vue/articleAction_add.action', //文章新增
	'SYSTEM_ARTICLE_EDIT': '/vue/articleAction_edit.action', //文章修改
	'SYSTEM_ARTICLE_DEL': '/vue/articleAction_del.action', //文章删除
	'SYSTEM_USER_GETASYNCDATA': '/vue/userAction_getAsyncData.action', //vuex中的异步加载数据
	'getFullPath': k => { //获得请求的完整地址,用于mockjs测试时使用
		return this.SERVER + this[k];
	}
}

后台:

package com.zking.vue.util;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 配置tomcat允许跨域访问
 * 
 * @author Administrator
 *
 */
public class CorsFilter implements Filter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}

	// @Override
	// public void doFilter(ServletRequest servletRequest, ServletResponse
	// servletResponse, FilterChain filterChain)
	// throws IOException, ServletException {
	// HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
	//
	// // Access-Control-Allow-Origin就是我们需要设置的域名
	// // Access-Control-Allow-Headers跨域允许包含的头。
	// // Access-Control-Allow-Methods是允许的请求方式
	// httpResponse.addHeader("Access-Control-Allow-Origin", "*");// *,任何域名
	// httpResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT,
	// DELETE");
	// // httpResponse.setHeader("Access-Control-Allow-Headers", "Origin,
	// // X-Requested-With, Content-Type, Accept");
	//
	// // 允许请求头Token
	// httpResponse.setHeader("Access-Control-Allow-Headers",
	// "Origin,X-Requested-With, Content-Type, Accept, Token");
	// HttpServletRequest req = (HttpServletRequest) servletRequest;
	// System.out.println("Token=" + req.getHeader("Token"));
	// if("OPTIONS".equals(req.getMethod())) {
	// return;
	// }
	//
	//
	// filterChain.doFilter(servletRequest, servletResponse);
	// }

	@Override
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
			throws IOException, ServletException {
		HttpServletResponse resp = (HttpServletResponse) servletResponse;
		HttpServletRequest req = (HttpServletRequest) servletRequest;

		// Access-Control-Allow-Origin就是我们需要设置的域名
		// Access-Control-Allow-Headers跨域允许包含的头。
		// Access-Control-Allow-Methods是允许的请求方式
		resp.setHeader("Access-Control-Allow-Origin", "*");// *,任何域名
		resp.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, DELETE");
		// resp.setHeader("Access-Control-Allow-Headers", "Origin,X-Requested-With,
		// Content-Type, Accept");
		// 允许客户端,发一个新的请求头jwt
		resp.setHeader("Access-Control-Allow-Headers", "Origin,X-Requested-With, Content-Type, Accept, jwt");

		// 允许客户端,处理一个新的响应头jwt
		resp.setHeader("Access-Control-Expose-Headers", "jwt");
		// String sss = resp.getHeader("Access-Control-Expose-Headers");
		// System.out.println("sss=" + sss);

		// 允许请求头Token
		// httpResponse.setHeader("Access-Control-Allow-Headers","Origin,X-Requested-With,
		// Content-Type, Accept, Token");
		// System.out.println("Token=" + req.getHeader("Token"));

		if ("OPTIONS".equals(req.getMethod())) {// axios的ajax会发两次请求,第一次提交方式为:option,直接返回即可
			return;
		}
		filterChain.doFilter(servletRequest, servletResponse);
	}

	@Override
	public void destroy() {

	}
}

后台交互(axios/qs/vue-axios)

3.1 axios

  axios是vue2提倡使用的轻量版的ajax。它是基于promise的HTTP库。它会从浏览器中创建XMLHttpRequests,与Vue配合使用非常好。



  1.题外话:

  vue.js有著名的全家桶系列:vue-router,vuex, vue-resource,再加上构建工具vue-cli,就是一个完整的vue项目的核心构成。

  其中vue-resource是Vue.js的一款插件,它可以通过XMLHttpRequest或JSONP发起请求并处理响应,但在vue更新到2.0之后,

  作者就宣告不再对vue-resource更新,而是推荐的axios



  2.GET提交

  axios.get('/user', {//注意数据是保存到json对象的params属性

    params: {

      ID: 12345

    }

  }).then(function (response) {

    console.log(response);

  }).catch(function (error) {

    console.log(error);

  });



  3.POST提交

  axios.post('/user', {//注意数据是直接保存到json对象

    firstName: 'Fred',

    lastName: 'Flintstone'

  }).then(function (response) {

    console.log(response);

  }).catch(function (error) {

    console.log(error);

  });



  注1:axios跨域问题

       会一直报错:“http://127.0.0.1:8848' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header”

       因为使用了前后端分离开发,跨域访问了,解决方案:需要配置tomcat允许跨域访问,

       tomcat跨域配置方法很多,但最简单的方式是自己写一个过滤器CorsFilter实现,添加一个响应头

       Access-Control-Allow-Origin即可

       httpResponse.addHeader("Access-Control-Allow-Origin", "*");//*表示任何域名

       httpResponse.addHeader("Access-Control-Allow-Origin", "http://localhost:80");



       Access-Control-Allow-Origin:*                           #则允许所有域名的脚本访问该资源。

       Access-Control-Allow-Origin:https://www.fujieace.com    #允许特定的域名访问



  注2:axios.get提交没有问题,axios.post提交后台接收不到数据

       因为POST提交的参数的格式是Request Payload,这样后台取不到数据的

       解决方案:使用qs.js库,将{a:'b',c:'d'}转换成'a=b&c=d'



  注3:为简化axios使用,还可以使用axios全局配置及拦截器,详情见资料“api/http.js”

       axios.defaults.baseURL = 'https://api.example.com';

       //axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;//自定义请求头,添加认证令牌

       axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';



  注4:为方便开发,建议对请求地址进行封装,详情见资料“api/action.js”



  注5:^_^~~~~为进一步简化开发,将action.js的URL地址封装到axios.urls属性上         

3.2 qs

  qs.js它是一个url参数转化的js库。用法就两个:

  var obj = qs.parse('a=b&c=d');  //将URL解析成对象的形式:{a:'b',c:'d'}

  var str = qs.stringify(obj);    //将对象 序列化成URL的形式,以&进行拼接:a=b&c=d'

3.3 vue-axios

  vue-axios是在axios基础上扩展的插件,在Vue.prototype原型上扩展了$http等属性,可以更加方便的使用axios

3.4 axios/qs/vue-axios安装及使用步骤

  1.安装

  npm install axios -S

  npm install qs -S  

  npm install vue-axios -S                        



  2.修改main.js文件

  #import axios from 'axios'

  #import qs from 'qs'

  import axios from '@/api/http'             #vue项目对axios的全局配置      

  import VueAxios from 'vue-axios'

  Vue.use(VueAxios,axios)



  3.之后就可以直接在Vue组件文件的methods里使用了  

  this.axios.get(url,{params:{id:1,name:'zs'}}).then((response)=>{

    this.newsList=response.data.data;

  }).catch((response)=>{

    console.log(response);

  });

附录一:ES6的语法箭头函数

doSomething(function(a){…});

doSomething((a)=>{});

处理CORS跨域的监听器

测试效果

如何测试呢?

就是我们上面写的一个登陆界面,点击提交的时候就会用到 axios的get方法,然后去请求后台的数据,再通过回调函数来处理事件的结果.

当然,必须启动tomact 和 Node.js 服务器,然后就行了

SPA实现前后台分离之登录_第4张图片

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