前后端分离之前后端交互(三)

上一篇利用element-ui写了一个登录页面,这一篇就来到后端写一下接口并进行对接,这样,一个前后端分离的小案例就算完成了,后端采用了springboot框架,可以参考我之前的博客,这篇就不一一赘述了,直接开始

实体类

User.java

package com.perfree.entiy;

public class User {
	
	private String name;
	
	private String pass;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPass() {
		return pass;
	}

	public void setPass(String pass) {
		this.pass = pass;
	}	
}

结果集

result.java

package com.perfree.common;

public class Result<T> {
	//状态码
	private Integer flag;
	//信息
	private String msg;
	//结果集
	private T data;

	public Integer getFlag() {
		return flag;
	}

	public void setFlag(Integer flag) {
		this.flag = flag;
	}

	public String getMsg() {
		return msg;
	}

	public void setMsg(String msg) {
		this.msg = msg;
	}

	public T getData() {
		return data;
	}

	public void setData(T data) {
		this.data = data;
	}
}

controller

VueController.java,因为只是体验前后端分离项目,这里就不连接数据库了,直接对比,代码也懒得优化了,一堆重复代码,主要是前后端分离的体验,不多说,看代码

package com.perfree.controller;

import javax.servlet.http.HttpSession;

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

import com.perfree.common.Result;
import com.perfree.entiy.User;

@RestController
public class VueController {
	
	@CrossOrigin(origins="*",allowCredentials="true")
	@RequestMapping(value="/login")
	public Result<User> login(HttpSession session,User user) {
		Result<User> result = new Result<>();
		if(user.getName().equals("perfree")) {
			if(user.getPass().equals("123456")) {
				result.setFlag(200);
				result.setMsg("登录成功");
				result.setData(user);
				return result;
			}
		}
		result.setFlag(500);
		result.setMsg("登录失败");
		return result;
	}
}

@CrossOrigin为开启跨域支持,还有一个value值可写,代表白名单,就是说白名单的ip可自由访问,但是其他就不行
这样一个简单登录接口就完事了,我们回到前端项目

安装axios

axios是个啥?可以简单的理解为之前的ajax,具体可以看axios
终端或者cmd进入项目根目录

npm install axios -d

安装vue-axios

这又是个啥?简单的理解为axios的vue版

npm install vue-axios -d

安装qs

用来解析对象的

npm install qs -d

引入

修改main.js

import Vue from 'vue'
import App from './App.vue'
import VueRouter from 'vue-router'
import ElementUI from 'element-ui';
import Axios from 'axios';
import VueAxios from 'vue-axios';

//css
import 'element-ui/lib/theme-chalk/index.css';

//js
import routes from './js/router/routes.js'

Vue.use(VueRouter);
Vue.use(ElementUI);
Vue.use(VueAxios,Axios);

Axios.defaults.baseURL = 'http://127.0.0.1:8885';//默认链接
Axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=UTF-8';
Axios.defaults.withCredentials = true;//开启跨域

const router = new VueRouter({
	//去掉链接中#号
	mode:'history',
	routes:routes
})

new Vue({
	router,
	el: '#app',
	render: h => h(App)
})

修改Login.vue

<template>
	<div id="login">
		<el-form ref="user" :model="user" label-width="80px" class="login-form" :label-position="labelPosition" :rules="rules">
			<el-form-item label="用户名" prop="name">
				<el-input v-model="user.name"></el-input>
			</el-form-item>
			<el-form-item label="密码" prop="pass">
				<el-input v-model="user.pass"></el-input>
			</el-form-item>
			<el-button type="primary" @click="onSubmit('user')" class="submit-btn">登录</el-button>
		</el-form>
	</div>
</template>

<script>
	import qs from 'qs'
	export default {
		name:"login",
		data() {
			return {
				labelPosition: 'top',
				user:{
					name:"",
					pass:""
				},
				rules: {
					name: [
						{ required: true, message: '请输入用户名', trigger: 'blur' },
						{ min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
					],
					pass: [
						{ required: true, message: '请输入密码', trigger: 'blur' }
					]
				}
			};
		},
		methods:{
			onSubmit(formName) {
				var self = this;
				self.$refs[formName].validate((valid) => {
					if (valid) {
						self.axios.post('/login', qs.stringify({
							name:self.user.name,pass:self.user.pass
						}))
						.then(function (response) {
							var result = response.data;
							if(result.flag == 200){
								self.$router.push('/foo');
							}else{
								self.$message({
									message: result.msg,
									type: 'error'
								});
							}
						})
						.catch(function (error) {
							alert("error");
						});
					}
				});
			}
		}
	}
</script>

<style>
.login-form{
	width: 400px;
}
.submit-btn{
	width: 100%;
}
</style>

当登录成功会跳转至我们之前写的foo页面,失败会提示失败信息