配置
router和vuex需要在创建vue项目的时候,开始的时候选择Manually select features,于是就可以在下一个创建配置讯问中选择router和vuex。
axios则需要执行命令行:
npm install axios -S
之后再在需要发送请求的view导入即可。
router实现左边点击右边打开
首先需要安装ElementUI,方法见day4 vue2以及ElementUI-CSDN博客。
在App.vue中导入框架,将<nav>、<router-view>标签移动到对应位置。其中to配置相当于servlet请求的路径。
<template>
<div id="app">
<el-container>
<el-header>欢迎你</el-header>
<el-container>
<el-aside width="200px">
<nav>
<ul>
<li><router-link to="/">Home</router-link></li>
<li><router-link to="/about">About</router-link></li>
<li><router-link to="/question">问题管理</router-link></li>
<li><router-link to="/new">新页面</router-link></li>
</ul>
</nav>
</el-aside>
<el-main><router-view/></el-main>
</el-container>
</el-container>
</div>
</template>
<style>
#app {
font-family: Avenir, Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-align: center;
color: #2c3e50;
}
nav {
padding: 30px;
}
nav a {
font-weight: bold;
color: #2c3e50;
}
nav a.router-link-exact-active {
color: #42b983;
}
</style>
并在router的 index.js中配置请求路径对应的view们,相当于web.xml。其中有两种方式导入view,第一种可以直接开头import,在routers中的component中就只用写出你的模块名即可,这是静态导入,其实相当于js中的include编译指令,开始就导入自然加载速度会变快,但是动态导入往往常见一些,就比如这里可以直接在component中 ()=>import ('路径'),这样是动态导入,请求该view的时候才会加载,更灵活。
import Vue from 'vue'
import VueRouter from 'vue-router'
import HomeView from '../views/HomeView.vue'
// 路由的配置
Vue.use(VueRouter)
const routes = [
{
path: '/',
name: 'home',
component: HomeView
},
{
path: '/about',
name: 'about',
// route level code-splitting
// this generates a separate chunk (about.[hash].js) for this route
// which is lazy-loaded when the route is visited.
component: () => import(/* webpackChunkName: "about" */ '../views/AboutView.vue')
},
{
path:'/question',
name:'question',
component:() => import(/* webpackChunkName: "about" */ '../views/QuestionView.vue')
},
{
path:'/new',
name:'new',
component:() => import(/* webpackChunkName: "about" */ '../views/NewView.vue')
}
]
// js文件中导出一个 router 实例
const router = new VueRouter({
routes
})
export default router
使用vuex处理用户的动作
vuex主要往外导出五个属性,在store的index.js中,state用于储存页面共享的数据,actions用于处理发出的动作,mutations用于直接操纵state中的数据,getters中对state中的数据进行再次加工,类似vue中计算属性computed。
就如图片中一样,view中用dispatch发出动作,actions使用commit将动作处理,转给mutations对state进行直接操作,前端可以直接调用state中的数据,来实现数据更新。getters的处理则直接可以前端执行{{$store.getters.方法名}}。
store中的index.js:
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
export default new Vuex.Store({
state: {// 共享数据
count: 0, // 初值为零
myNewList:[]
},
getters: { // 对state中的数据进行再次加工,类似vue中计算属性computed
update(state) {
return state.count * 10;
}
},
mutations: { // 修改state数据
change(state, value) {
state.count += value;
},
sub(state, value) {
state.count -= value;
}
},
actions: { // 相应动作处理
// 必须与dispatch中的时间名一致
sum(context, value) {
context.commit('change', value);
},
sub(context, value) {
context.commit('sub', value);
}
},
modules: { // 分模块化开发,一个模块可以有自己的state,getters,mutations,actions
}
})
前端调用:
<template>
<div class="about">
<h1>This is an about page</h1>
<h2>当前计算的和为:{{$store.state.count}}</h2>
<h2>当前计算的和 ✖ 10 为:{{$store.getters.update}}</h2>
<el-button @click="add" type="primary" round>我猜你不会点击我</el-button>
<br/><br/>
<el-button @click="sub" type="primary" round>我可以回去哦</el-button>
</div>
</template>
<script>
export default{
name: "AboutView",
methods:{
// 求和时间处理
add(){
// 进行dispatch
this.$store.dispatch("sum",5);
},
sub(){
this.$store.dispatch("sub",10);
}
}
}
</script>
使用axios实现前后端连接
其原理是可以使用axios访问不同端口,向不同端口发送请求,有两种方式发送请求:
可以直接在view中导入axios包,直接发送请求,但是因为请求的地址往往容易变化,所以需要用第二种方式来发送请求,首先在util包中创建js页面配置baseUrl(在此导入axios包),也就是端口号,然后在api包中创建针对不同view的不同请求url,也就是请求的具体地址和请求方法以及可能的参数,将方法配置可以其他文件访问(export default),这时候就需要将配置好的js文件直接导入到view中,然后再调用方法即可。
url在view中(第一种):
<template>
<div class="home">
<img alt="Vue logo" src="../assets/logo.png" />
<HelloWorld msg="Welcome to Your Vue.js App" />
<br/>
<el-button @click="sendRequest()" type="primary">发送axios请求,进行调用springboot项目</el-button>
<br/><br/><br/>
<el-table :data="this.$store.state.myNewList" border style="width: 100%">
<el-table-column fixed prop="id" label="编号" width="150">
</el-table-column>
<el-table-column prop="expertName" label="专家姓名" width="120"> </el-table-column>
<el-table-column prop="questioner" label="提问人" width="120">
</el-table-column>
<el-table-column prop="phone" label="电话" width="120"> </el-table-column>
<el-table-column prop="plantName" label="农作物名称" width="300">
</el-table-column>
<el-table-column prop="question" label="问题" width="120"> </el-table-column>
<el-table-column prop="answer" label="回答" width="120"> </el-table-column>
<el-table-column prop="status" label="状态" width="120"> </el-table-column>
<el-table-column fixed="right" label="操作" width="100">
<template slot-scope="scope">
<el-button @click="handleClick(scope.row)" type="text" size="small"
>查看</el-button
>
<el-button type="text" size="small">编辑</el-button>
</template>
</el-table-column>
</el-table>
</div>
</template>
<script>
// @ is an alias to /src
import HelloWorld from "@/components/HelloWorld.vue";
import axios from "axios"; // 引入axios库
export default {
name: "HomeView",
components: {
HelloWorld,
},
methods: {
sendRequest() {
axios
.get("http://localhost:8888/question/findAll")
.then(response => {
this.questonList = response.data.data;
this.$store.state.myNewList = response.data.data;
});
},
},
data(){
return {
questonList: []
}
}
};
</script>
url在js文件中(第二种):
<template>
<div class="home">
<img alt="Vue logo" src="../assets/logo.png" />
<br />
<el-button @click="search" type="primary">search</el-button>
<el-button @click="add()" type="primary">add</el-button>
<br /><br /><br />
<el-input v-model="inputValue" placeholder="请输入id或专家姓名"></el-input>
<br /><br />
<el-table :data="questionList" border style="width: 100%">
<el-table-column fixed prop="id" label="编号" width="150">
</el-table-column>
<el-table-column prop="expertName" label="专家姓名" width="120">
</el-table-column>
<el-table-column prop="questioner" label="提问人" width="120">
</el-table-column>
<el-table-column prop="phone" label="电话" width="120"> </el-table-column>
<el-table-column prop="plantName" label="农作物名称" width="300">
</el-table-column>
<el-table-column prop="question" label="问题" width="120">
</el-table-column>
<el-table-column prop="answer" label="回答" width="120">
</el-table-column>
<el-table-column prop="status" label="状态" width="120">
</el-table-column>
<el-table-column fixed="right" label="操作" width="100">
<template slot-scope="scope">
<el-button @click="handleClick(scope.row)" type="text" size="small"
>删除</el-button
>
<el-button type="text" size="small">编辑</el-button>
</template>
</el-table-column>
</el-table>
</div>
</template>
<script>
// @ is an alias to /src
import queApi from "@/api/question"; // 导入封装后的axios请求,具体见src/api/question.js
export default {
name: "HomeView",
methods: {
sendRequest() {
queApi.getQuestionList().then((res) => {
this.questionList = res.data.data;
this.$store.state.myNewList = this.questionList; // 数据共享
});
}
},
data() {
return {
questionList: [],
inputValue: "",
};
},
};
</script>
api文件中配置:
import request from '../utils/request'; // 导入axios实例
/**
* 调用boot端,进行/question/findAll查询
* @returns {Promise}
*/
function getQuestionList() { // 获取问题列表
return request({
url: '/question/findAll',
method: 'get'
});
}
export default {
getQuestionList, // 导出函数
} // 导出对象
除了findAll方法之外,还可以其他方法:
后端
注意axios支持get、post、put、delete等请求,所以可以直接按照swagger的请求规范做,还有一点要注意,需要配置后端可以接受并处理其他端口发出的各种请求,也就需要配置CorsConfig文件:
package com.zheng.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class CorsConfig implements WebMvcConfigurer {
@Override
public void addCorsMappings(CorsRegistry registry) {
// 添加映射路径
registry.addMapping("/**")
// .allowedOrigins("*") //
.allowedOriginPatterns("*") //允许哪些域的请求,星号代表允许所有
.allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE") // 允许的方法
.allowedHeaders("*") // 允许的头部设置
.allowCredentials(true) // 是否发送cookie
.maxAge(168000); // 预检间隔时间
}
}
除此之外,如果发送的是post、put请求,也就是要将传递的参数放到请求体中的,需要在获得形参之前加@RequestBody,才能将传递的参数和需要的参数一一对应。
package com.zheng.controller;
import com.zheng.entity.Question;
import com.zheng.model.Result;
import com.zheng.service.QuestionService;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* Controller整合Swagger
*/
@RestController
@RequestMapping("/question")
@Tag(name="question",description = "tb_question控制层") // swagger标签
public class QuestionController {
@Autowired
private QuestionService questionService;
@Operation(description = "question查询全部") // swagger 标签
@GetMapping("/findAll")
// public List<Question> findAll() {
// return questionService.findAll();
// }
public Result<List<Question>> findAll() {
return Result.ok(questionService.findAll());
}
/**
* findById?id=10
* @param id
* @return
*/
@Operation(description = "question根据主键查询") // swagger 标签
@GetMapping("findById")
// public Question findById(@RequestParam("id") int id) {
// return questionService.findById(id);
// }
public Result<Question> findById(@RequestParam("id") int id) {
return Result.ok(questionService.findById(id));
}
@Operation(description = "根据专家名字查询")
@GetMapping("/findByExpertName/{expertName}")
public Result<List<Question>> findByExpertName(@PathVariable("expertName") String expertName) {
return Result.ok(questionService.findByExpertName(expertName));
}
@PostMapping("/save")
@Operation(description = "添加question")
public Result<Integer> save(@RequestBody Question question) {
return Result.ok(questionService.save(question));
}
@PutMapping("/update") // 修改只能用put请求,删除只能用delete请求
@Operation(description = "修改question")
public Result<Integer> update(Question question) {
return Result.ok(questionService.update(question));
}
/**
* /delete/10
* @param id
* @return
*/
@DeleteMapping("/delete/{qid}")
@Operation(description = "按照编号删除question")
public Result<Integer> delete(@PathVariable("qid") int id) {
return Result.ok(questionService.delete(id));
}
}
一个好习惯是将返回的数据封装成一个Result<T>类(这也相当于一个特殊的实体类)来处理,这样当面对不同的数据类型的时候才能正常处理:
package com.zheng.model;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class Result<T> {
private Integer code; // 编码 ;200 404 500
private String msg; // 消息内容
private T data; // 真正的数据
public Result(Integer code, T data) {
this.code = code;
this.data = data;
}
public Result(String msg, T data) {
this.msg = msg;
this.data = data;
}
public Result(T data){
this.data = data;
}
public static<T> Result<T> ok(T data){
return new Result(200,"success",data);
}
public static<T> Result<T> fail(Integer code){
return new Result(500,"fail",null);
}
}
前端
对于前端如何链接这么多方法呢:
如果是get、delete请求并将传递的参数直接拼接在路径中,而非键值对的形式,那么在前端也可以直接拼接在url中,不能使用参数params,否则404:
function findByExpertName(expertName) {
return request({
url:'/question/findByExpertName/' + expertName,
method:'get'
})
}
对于post请求可以直接这样传递参数(在控制层是直接接受一个对象的类型,所以传入的也是一个对象类型,直接使用data列出要传递的参数即可),对于get请求参数必须params,而post、put、delete请求必须data传递数据:
function addQuestion(data) { // 新增问题
return request({
url: '/question/save',
method: 'post', // post 请求执行添加操作
data: data // 发送数据
})
}
最后,做的小项目:实现findById以及findByExpertName以及add方法
<template>
<div class="home">
<img alt="Vue logo" src="../assets/logo.png" />
<br />
<el-button @click="search" type="primary">search</el-button>
<el-button @click="add()" type="primary">add</el-button>
<br /><br /><br />
<el-input v-model="inputValue" placeholder="请输入id或专家姓名"></el-input>
<br /><br />
<el-table :data="questionList" border style="width: 100%">
<el-table-column fixed prop="id" label="编号" width="150">
</el-table-column>
<el-table-column prop="expertName" label="专家姓名" width="120">
</el-table-column>
<el-table-column prop="questioner" label="提问人" width="120">
</el-table-column>
<el-table-column prop="phone" label="电话" width="120"> </el-table-column>
<el-table-column prop="plantName" label="农作物名称" width="300">
</el-table-column>
<el-table-column prop="question" label="问题" width="120">
</el-table-column>
<el-table-column prop="answer" label="回答" width="120">
</el-table-column>
<el-table-column prop="status" label="状态" width="120">
</el-table-column>
<el-table-column fixed="right" label="操作" width="100">
<template slot-scope="scope">
<el-button @click="handleClick(scope.row)" type="text" size="small"
>删除</el-button
>
<el-button type="text" size="small">编辑</el-button>
</template>
</el-table-column>
</el-table>
<!-- 添加的对话框-->
<el-dialog title="问题信息" :visible.sync="dialogFormVisible">
<el-form :model="form" :rules="rules" ref="questionForm">
<el-form-item
label="expertName"
:label-width="formLabelWidth"
prop="expertName"
>
<el-input v-model="form.expertName" autocomplete="off"></el-input>
</el-form-item>
<el-form-item
label="questioner"
:label-width="formLabelWidth"
prop="questioner"
>
<el-input v-model="form.questioner" autocomplete="off"></el-input>
</el-form-item>
<el-form-item label="phone" :label-width="formLabelWidth" prop="phone">
<el-input v-model="form.phone" autocomplete="off"></el-input>
</el-form-item>
<el-form-item
label="plantName"
:label-width="formLabelWidth"
prop="plantName"
>
<el-input v-model="form.plantName" autocomplete="off"></el-input>
</el-form-item>
<el-form-item label="title" :label-width="formLabelWidth" prop="title">
<el-input v-model="form.title" autocomplete="off"></el-input>
</el-form-item>
<el-form-item
label="question"
:label-width="formLabelWidth"
prop="question"
>
<el-input v-model="form.question" autocomplete="off"></el-input>
</el-form-item>
<el-form-item
label="answer"
:label-width="formLabelWidth"
prop="answer"
>
<el-input v-model="form.answer" autocomplete="off"></el-input>
</el-form-item>
<el-form-item
label="status"
:label-width="formLabelWidth"
prop="status"
>
<el-input v-model="form.status" autocomplete="off"></el-input>
</el-form-item>
</el-form>
<div slot="footer" class="dialog-footer">
<el-button @click="cancel">取 消</el-button>
<el-button type="primary" @click="save">保 存</el-button>
</div>
</el-dialog>
</div>
</template>
<script>
// @ is an alias to /src
import queApi from "@/api/question"; // 导入封装后的axios请求,具体见src/api/question.js
export default {
name: "HomeView",
methods: {
sendRequest() {
queApi.getQuestionList().then((res) => {
this.questionList = res.data.data;
this.$store.state.myNewList = this.questionList;
});
},
isNumber(value) {
return /^\d+$/.test(value) && value !== '';
},
search() {
if (this.inputValue == "") {
this.sendRequest();
} else {
if (this.isNumber(this.inputValue)) {
this.findById();
} else {
this.findByExpertName();
}
}
// this.sendRequest();
},
findById() {
queApi.findById(this.inputValue).then((res) => {
this.question = res.data.data;
if (this.question != null) {
this.$set(this, "questionList", []); // 清空原有数据
this.questionList.push(this.question);
} else {
alert("未查询到数据");
}
});
},
add() {
this.dialogFormVisible = true;
},
cancel() {
this.dialogFormVisible = false;
this.form = {
expertName: "",
questioner: "",
phone: "",
plantName: "",
title: "",
question: "",
answer: "",
status: "",
};
},
save() {
// 验证表单
this.$refs.questionForm.validate((validate) => {
if (validate) {
// 验证通过,可以提交数据
// alert(this.form.expertName);
queApi.addQuestion(this.form).then((res) => {
if (res.data.code == 200) {
alert("添加了" + res.data.data + "条数据");
this.sendRequest();
} else {
alert(res.data.msg);
}
});
this.dialogFormVisible = false;
this.form = {
expertName: "",
questioner: "",
phone: "",
plantName: "",
title: "",
question: "",
answer: "",
status: "",
};
}
});
},
findByExpertName() {
queApi.findByExpertName(this.inputValue).then((res) => {
if (res.data.data == null) {
alert("未查询到数据");
} else {
this.questionList = res.data.data;
}
});
},
},
data() {
return {
questionList: [],
question: {},
inputValue: "",
dialogFormVisible: false, // 控制添加的对话框是否可见
form: {
expertName: "",
questioner: "",
phone: "",
plantName: "",
title: "",
question: "",
answer: "",
status: "",
},
formLabelWidth: "100px",
rules: {
expertName: [
{ required: true, message: "请输入专家姓名", trigger: "blur" },
],
questioner: [
{ required: true, message: "请输入提问人", trigger: "blur" },
],
phone: [
{ required: true, message: "请输入电话", trigger: "blur" },
// {
// pattern: /^1[34578]\d{9}$/,
// message: "请输入正确的手机号",
// trigger: "blur",
// },
],
plantName: [
{ required: true, message: "请输入农作物名称", trigger: "blur" },
],
title: [{ required: true, message: "请输入标题", trigger: "blur" }],
question: [{ required: true, message: "请输入问题", trigger: "blur" }],
answer: [{ required: true, message: "请输入回答", trigger: "blur" }],
status: [{ required: true, message: "请输入状态", trigger: "blur" }],
},
};
},
};
</script>