2021Java实训

1.前端

<img src="地址" alt="当图片消失时显示的文字" title="当光标放在图片上时显示的文字"/>
form表单：收集用户提交的数据，并提交给后台服务器
submit按钮不能有name属性
通过form表单收集数据时，如果向服务器提交数据，必须指明name属性，向服务器提交的数据格式为name为key，value为v的键值对
选择器：1.标签选择器2.类选择器3.id选择器
JavaScript的main函数写法：也叫立即执行函数，往往只会执行一次(function f(){console.log(123);})();

1.1Array

js排序规则：let books=[{title:'bbbb',price:12},{title:'aaaa',price:10},{title:'ccc',price:14},{title:'ddd',price:13}];console.log(books);books.sort(ruletitle);function rule(x, y){  // sort 的排序规则函数的规则： x>y ? 1:-1;return x.price - y.price ;}function ruletitle(x, y){return  x.title > y.title ? 1 :  -1;}console.log(books);console.log('ab' > 'ba');
Array数组的filter方法：var ages = [32, 33, 16, 40];function checkAdult(age) {return age >= 18;}function myFunction() {document.getElementById("demo").innerHTML = ages.filter(checkAdult);}或者：const  ages = [32, 33, 16, 40];let agesr =  ages.filter(function(age){return age>=18;})console.log(agesr);
forEach方法：arr.forEach(function(item){console.log(item);})
map方法：类似于函数的一一对应const arr =[1,23,4,3,45,675,465,678,65,4,6,6,7,5,8,789,56,34];// 保持着一一对应的关系let arrr =  arr.map(function(item){return  0})console.log(arrr);
reduce方法：const arr =[1,23,4,3,45,675,465,678,65,4,6,6,7,5,8,789,56,34];let s = arr.reduce(function(x,y){return x + y;})等价于：let s = 0;for(var i = 0;i < arr.length;i++){let x = arr[i];s = s + x;}
find方法：let books=[{title:'bbbb',price:12},{title:'aaaa',price:10},{title:'ccc',price:14},{title:'ddd',price:13}];let book = books.find(function(b){return b.title === 'aaaa';})console.log(book);
join方法：将数组的数据用'-'连接起来let s = arr.join('-')

1.2箭头函数

const f = function(v){return v+v;
}
等价于：
const fx = (v)=>{return v+v;
}
箭头函数的语法规则：
1.如果函数的形参数量为1，那么形参的小括号可以省略，否则不允许const fx = v => {return v+v;}
2.如果函数体只有一条语句，则大括号可以省略const fx = v => v+v;
3.如果函数体只有一条语句，且是return，那么大括号和return都可以省略const fx = x=>x*x;let arr =[1,23,4,3,45,675,465,678,65,4,6,6,7,5,8,789,56,34];
let arrr =  arr.filter(x => x%2==0)
let s = arr.reduce((x,y)=> x + y);

1.3DOM、BOM

动态显示时间：function settime() {let h2t = document.getElementById('rest');let now = new Date();let s = `${now.getHours()}:${now.getMinutes()}:${now.getSeconds()}`;h2t.innerHTML = s;}setInterval(()=>{settime()},1000)全选和反选用js实现：<script type="text/javascript">(()=>{let sa =  document.getElementById('sa');sa.onclick=(event)=>{let checked = event.target.checked;let gids =  document.getElementsByName('gids');gids.forEach((input)=>{input.checked =  checked;});};//  反选功能实现let sa1 =  document.getElementById('sa1');sa1.onclick=( )=>{let gids =  document.getElementsByName('gids');gids.forEach((input)=>{input.checked =  !input.checked;});};})(); </script>

1.4ES6新特性

1.函数的扩展rest参数：可以用于获取函数的多余参数const f = (x,y,...rest)=>{console.log(rest);}let sum = f(3,32,3,36,66,4)//rest=3,36,66,4
2.arguments：const f= function(){console.log(arguments);//输出实际参数console.log(123);}f(3,32,3,6,66,4);

1.5JSON

满足JSON的共有两种：1.满足JSON语法的字符串2.满足JSON格式要求的JavaScript对象
JSON与字符串之间的转换：JSON转换成字符串：使用JSON.stringify()字符串转换成JSON：使用JSON.parse()

1.6Web存储

sessionStorage、LocalStorage
setItem、getItem、removeItem

1.7类

在javascript中，每一个类都有一个prototype，它就是类的原型，类的所有实例共享一个原型。

2.VUE

2.1全局组件

全局组件的使用必须依赖于某个vue的实例：
<script>Vue.component('mycom',{template:"<h5>nihao</h5>"})
</script>
<div id="app"><mycom></mycom>  //起作用
</div>
<mycom></mycom> //不起作用

2.2全局组件的另一种写法

<template id="mytemplate"><div><h2>{{message}}</h2></div>
</template>
<script>Vue.component('mycom',{template:"#mytemplate"})
</script>

2.3父子组件通信(父组件->子组件)

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<body><div id="app"><compo></compo></div><template id="tem"><div><h2>父组件</h2><com :live="money"></com></div></template><script type="text/javascript">let son = {template:`<h5>子组件，接收到生活费：{{live}}</h5>`,props:['live']}let father = {template: '#tem',data(){return{money:1000}},components:{com:son}}let vuetest = new Vue({el:'#app',components: {compo:father}})</script>
</body>

2.4父子组件通信(子组件->父组件)

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<body><div id="app"><compo></compo></div><template id="tem"><div><h2>父组件</h2><h2>子组件给父组件：{{childm}}</h2><com @childmoney="get" :live="money"></com></div></template><script type="text/javascript">let son = {template:`<div><h5>子组件，接收到生活费：{{live}}</h5><button @click="send">孝敬父组件</button></div>`,props:['live'],methods:{send(){this.$emit('childmoney',500)}}}let father = {template: '#tem',data(){return{money:1000,childm:0}},methods:{get(childmoney){this.childm=childmoney}},components:{com:son}}let vuetest = new Vue({el:'#app',components: {compo:father}})</script>
</body>

父组件->子组件      子组件props属性接收
子组件->父组件     子组件通过$emit主动给父组件数据，父组件监听子组件传递数据的属性childmoney
注意：vue不识别驼峰命名法，需要都用小写

2.5路由的配置和使用以及重定向

<body><div id="app"><h2>东软云医院</h2><hr><router-link to="/register">窗口挂号</router-link><router-link to="/exit">窗口退号</router-link><!--路由出口--><router-view></router-view></div><script>//1.定义组件实例let register = {template:`<div><h3>窗口挂号</h3></div>`}let exit = {template:`<div><h3>窗口退号</h3></div>`}let welcome = {template: `<div><img src="../img/2.jpg"></div>`}//2.定义路由规则const routes = [{path: '/',redirect: '/welcome'},{path: '/register',name: 'register',component: register},{path: '/exit',name: 'exit',component: exit},{path: '/welcome',name: 'welcome',component: welcome}]//3.创建路由的实例，识别路由规则的配置const router = new VueRouter({routes: routes})//4.将路由对象挂载到vue实例上，让当前整个页面都能进行路由的识别和访问let vuetest = new Vue({el:"#app",data:{},router})</script></body>

2.6路由的嵌套

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script><script src="https://cdn.jsdelivr.net/npm/vue-router/dist/vue-router.js"></script>
</head>
<body><div id="app"><h2>东软云医院</h2><hr><router-link to="/register">挂号收费</router-link><router-link to="/doctor">门诊医生</router-link><!--路由出口--><router-view></router-view></div><template id="register"><div><p>窗口挂号>></p><router-link to="/register/exit">窗口退号</router-link><router-view></router-view></div></template><template id="doctor"><div><p>门诊医生>></p><router-link to="/doctor/login">看诊记录</router-link><router-view></router-view></div></template><script>//1.定义组件实例let register = {template:'#register'}let doctor = {template:'#doctor'}let welcome = {template: `<div><img src="../img/2.jpg"></div>`}let exit = {template: `<div><p>窗口退号222</p></div>`}let login = {template: `<div><p>看诊记录222</p></div>`}//2.定义路由规则const routes = [{path: '/',redirect: '/welcome'},{path: '/register',name: 'register',component: register,children: [{path: '/register/exit',name: 'exit',component: exit}]},{path: '/doctor',name: 'doctor',component: doctor,children: [{path: '/doctor/login',name: 'login',component: login}]},{path: '/welcome',name: 'welcome',component: welcome}]//3.创建路由的实例，识别路由规则的配置const router = new VueRouter({routes: routes})//4.将路由对象挂载到vue实例上，让当前整个页面都能进行路由的识别和访问let vuetest = new Vue({el:"#app",data:{},router})</script></body>
</html>

2.7路由的传参

query get 明文，不安全，快，数据大小<=255byte
params post 加密，安全，慢，数据大小没有上限

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script><script src="https://cdn.jsdelivr.net/npm/vue-router/dist/vue-router.js"></script>
</head>
<body><div id="app"><h2>东软云医院</h2><hr><router-link :to="{name:'register',params:{rid:'123456'}}">窗口挂号</router-link><router-link :to="{path:'/exit',query:{eid:'222222'}}">窗口退号</router-link><!--路由出口--><router-view></router-view></div><script>//1.定义组件实例let register = {template:`<div><h3>{{$route.params.rid}}窗口挂号</h3></div>`}let exit = {template:`<div><h3>{{$route.query.eid}}窗口退号</h3></div>`}let welcome = {template: `<div><img src="../img/2.jpg"></div>`}//2.定义路由规则const routes = [{path: '/',redirect: '/welcome'},{path: '/register',name: 'register',component: register},{path: '/exit',name: 'exit',component: exit},{path: '/welcome',name: 'welcome',component: welcome}]//3.创建路由的实例，识别路由规则的配置const router = new VueRouter({routes: routes})//4.将路由对象挂载到vue实例上，让当前整个页面都能进行路由的识别和访问let vuetest = new Vue({el:"#app",data:{},router})</script></body>
</html>

2.8逻辑控制路由的跳转

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script><script src="https://cdn.jsdelivr.net/npm/vue-router/dist/vue-router.js"></script>
</head>
<body><div id="app"><h2>东软云医院</h2><hr><router-link to="/register">窗口挂号</router-link><router-link to="/exit">窗口退号</router-link><!--路由出口--><router-view></router-view></div><template id="login"><div><form>账号：<input type="text" v-model="user.id"><br>密码：<input type="password" v-model="user.pwd"><br><button @click="checkLogin">登录</button></form></div></template><script>//1.定义组件实例let register = {template:`<div><h3>窗口挂号</h3></div>`}let exit = {template:`<div><h3>窗口退号</h3></div>`}let welcome = {template: `<div><img src="../img/2.jpg"></div>`}let login = {template: '#login',data(){return{user:{}}},methods:{checkLogin(){if(this.user.id=="admin"&&this.user.pwd=="123456"){alert("正确")this.$router.push("/welcome")}else{alert("错误")}}}}//2.定义路由规则const routes = [{path: '/',redirect: '/login'},{path: '/register',name: 'register',component: register},{path: '/exit',name: 'exit',component: exit},{path: '/welcome',name: 'welcome',component: welcome},{path: '/login',name: 'login',component: login}]//3.创建路由的实例，识别路由规则的配置const router = new VueRouter({routes: routes})//4.将路由对象挂载到vue实例上，让当前整个页面都能进行路由的识别和访问let vuetest = new Vue({el:"#app",data:{},router})</script></body>
</html>

2.9路由的导航守卫

作用：在路由跳转前完成一些校验路由实例.beforeEach((to,from,next)=>{})to:目标路由from:当前路由next:函数，表示继续执行路由跳转

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script><script src="https://cdn.jsdelivr.net/npm/vue-router/dist/vue-router.js"></script>
</head>
<body><div id="app"><h2>东软云医院</h2><hr><router-link to="/register">窗口挂号</router-link><router-link to="/exit">窗口退号</router-link><!--路由出口--><router-view></router-view></div><template id="login"><div><form>账号：<input type="text" v-model="user.id"><br>密码：<input type="password" v-model="user.pwd"><br><button @click="checkLogin">登录</button></form></div></template><script>//1.定义组件实例let register = {template:`<div><h3>窗口挂号</h3></div>`}let exit = {template:`<div><h3>窗口退号</h3></div>`}let welcome = {template: `<div><img src="../img/2.jpg"></div>`}let login = {template: '#login',data(){return{user:{}}},methods:{checkLogin(){if(this.user.id=="admin"&&this.user.pwd=="123456"){//将登录成功信息存储成一个标识sessionStorage.setItem("isLogin","true")alert("正确")this.$router.push("/welcome")}else{sessionStorage.setItem("isLogin","false")alert("错误")}}}}//2.定义路由规则const routes = [{path: '/',redirect: '/login'},{path: '/register',name: 'register',component: register},{path: '/exit',name: 'exit',component: exit},{path: '/welcome',name: 'welcome',component: welcome},{path: '/login',name: 'login',component: login}]//3.创建路由的实例，识别路由规则的配置const router = new VueRouter({routes: routes})//4.将路由对象挂载到vue实例上，让当前整个页面都能进行路由的识别和访问let vuetest = new Vue({el:"#app",data:{},router})//路由导航的前置守卫router.beforeEach(function (to,from,next) {//确定守卫的路由列表const list = ['/register','/exit']if(list.indexOf(to.path)>=0){//判断是否登录 来确定路由是否跳转let str = sessionStorage.getItem("isLogin")console.log(str+"登陆状态标识")if (str==null||str=="false"){console.log("非法访问")//非法访问 应该拦截router.push("/login")location.reload()}}next()})</script></body>
</html>

2.10VUE脚手架

启动服务器：npm run serve下面是vue+element上课代码

<template><div class="about"><el-button @click="getData">获取数据</el-button><el-button @click="delSelectRows">批量删除</el-button><el-button @click="InsertdialogVisible=true">添加数据</el-button><el-table:data="subNews"style="width: 60%"@selection-change="hsc"><el-table-columntype="selection"width="55"></el-table-column><el-table-columnprop="index"label="编号"></el-table-column><el-table-columnprop="word"label="内容"></el-table-column><el-table-columnlabel="编辑"><template slot-scope="scope"><el-button @click="doUpdate(scope.row)" icon="el-icon-edit">修改</el-button><el-button @click="delRow(scope.$index)" icon="el-icon-delete">删除</el-button></template></el-table-column></el-table><el-paginationbackground:page-size="pageSize"layout="prev, pager, next":total="news.length"@current-change="dopaging"></el-pagination><el-dialogtitle="修改信息":visible.sync="dialogVisible"width="30%"><el-form label-width="80px"><el-form-item label="编码"><el-input disabled="true" v-model="updateRow.index"></el-input></el-form-item><el-form-item label="内容"><el-input v-model="updateRow.word"></el-input></el-form-item><el-form-item><el-button @click="dialogVisible=false">提交</el-button><el-button @click="dialogVisible=false">取消</el-button></el-form-item></el-form></el-dialog><!-- 添加对话框 --><el-dialogtitle="添加信息":visible.sync="InsertdialogVisible"width="30%"><el-form label-width="80px"><el-form-item label="编码"><el-input v-model="InsertRow.index"></el-input></el-form-item><el-form-item label="内容"><el-input v-model="InsertRow.word"></el-input></el-form-item><el-form-item><el-button @click="doInsert">提交</el-button><el-button @click="dialogVisible=false">取消</el-button></el-form-item></el-form></el-dialog></div>
</template><script>export default {data() {return {dialogVisible: false,InsertdialogVisible: false,msg: "askdjf",news: [],subNews: [],delArr: [],pageSize: 3,currPage: 1,updateRow: {},InsertRow: {}}},methods: {doInsert() {this.news.unshift(this.InsertRow)this.InsertRow = {}this.dopaging(1)this.InsertdialogVisible = false},doUpdate(row) {this.updateRow = rowthis.dialogVisible = true},dopaging(currPage) {this.currPage = currPage   //将当前选择的页码存储到vue的全局变量里//根据当前页进行分页//currpage      pageSize     start   end// 1               2          0       2        0,1// 2               2          2       4        2,3//3  ...let start = (currPage - 1) * this.pageSizelet end = currPage * this.pageSizethis.subNews = this.news.slice(start, end)},delSelectRows() {// for (let i in this.delArr){//     let dr = this.delArr[i]//     console.log(dr)//     for (let j in this.news){//         if (dr.index==this.news[j].index){//             this.news.splice(j,1)//         }//     }// }//自己写的for (let i in this.delArr) {if (this.news.indexOf(this.delArr[i]) != -1) {this.news.splice(this.news.indexOf(this.delArr[i]), 1)}}this.dopaging(this.currPage)},delRow(index) {console.log(index + ">>>>>>>>>>>>>.")//this.news.splice(index,1)let r = this.subNews.splice(index, 1)  //从数据表格中正在显示的数据中删除//将数据从news中删除for (let i in this.news) {if (this.news[i].index == r[0].index) {this.news.splice(i, 1)}}this.dopaging(this.currPage)  //删除成功后，重新分页},hsc(arr) {this.delArr = arr},getData() {//通过axios框架，获取服务器数据--天行数据let key = "b68ac6fd1f3caadc294512b5e24a5bf7"this.$axios.get("http://api.tianapi.com/wxhottopic/index?key=" + key).then((res) => {console.log(res.data.newslist)this.news = res.data.newslistthis.dopaging(1)})}}}
</script><style>.el-table {margin: 0 auto;}
</style>

2.11VUEX

store文件下的index.js存放可以被全局访问的数据
export default new Vuex.Store({state: {num: 1000},getters: {},mutations: {num(state, r) {state.num = r}},actions: {},modules: {}
})访问方式：{{$store.state.num}}
修改方式：this.$store.commit('num',1)

3.Git

1.云端仓库a.在码云上创建云仓库b.在本地生成公钥，与远程仓库进行识别配置git config --global user.name "zzy"git config --global user.email "email@example.com"ssh-keygen -t rsa -C "email@example.com"回车三次，生成公钥把公钥复制    配置到码云-管理-公钥c.本地仓库和远程仓库的关联git remote add origin sshgit remote add origin git@gitee.com:vivi_inno/zzy.gitd.注意!第一次本地仓库和云端仓库对接，必须先拉取再推送除了第一次，以后都是直接推送即可拉取命令： git pull --rebase origin master2.本地仓库a.初始化本地仓库  git initb.将文件添加到本地仓库   git add 赵智育.txtc.将添加好的文件进行提交本地仓库git commit  -m "提交文本"d.将本地仓库的内容推送到云仓库上git push origin master[注意：云端仓库提前配置完成]

4.后端

4.1SpringBoot

连接数据库时有时区的问题？
在database后面加上 ?serveTimezone=UTC项目文件中分为5个文件夹：
1.Controller
2.Iservice
3.mapper
4.pojo
5.service
其中，Controller文件夹中放controller层的代码
Iservice、mapper、service共同组成model层
pojo为数据库表的实体类

4.2application.yml的配置

server:port: 8080spring:datasource:name: testurl: jdbc:mysql://localhost:3306/his?serveTimezone=UTCusername: rootpassword: 2019201131driver-class-name: com.mysql.cj.jdbc.Drivermybatis:type-aliases-package: com.heu.test.pojoconfiguration:map-underscore-to-camel-case: truelogging:level:com.heu.test.mapper: trace

4.3动态SQL语句

@Mapper
public interface UserMapper {@Select("<script>select * from user where 1=1" +"<if test=\"name!=null and name != ''\">and UserName=#{name}</if>" +"<if test=\"id>0\">and ID=#{id}</if>" +"</script>")java.util.List<User> getUserList(String name,int id);@Insert("insert into user(ID, UserName, Password, RealName, UseType, DocTitleID, IsScheduling, DeptID, RegistLeID, DelMark) values" +" (#{id},#{userName},#{password},#{realName},#{useType},#{docTitleId},#{isScheduling},#{deptId},#{registLeId},#{delMark})")int insertUser(User user);@Update("<script>update User set delmark=1 where id in" +"<foreach collection=\"array\" item=\"eno\" open=\"(\" close=\")\" separator=\",\">" +"#{eno}</foreach>" +"</script>")int deletesById(int[] arr);@Delete("delete from user where ID=#{id}")int deleteUserByID(int id);
}

进行模糊查询
and realname like concat('%',#{name},'%')

控制器是直接和前端进行交互的

5.前后端交互

只有axios可以从前端获取后端数据
this.$axios.get().then()

5.1处理指向冲突

created() {let that = this   //处理指向冲突this.$axios.get("http://localhost:8080/user/getlist").then(function (res) {console.log(res.data)that.userList = res.data //如果用this.userList的话，this指代的就是this.$axios了})
}

5.2VUE导入外部的JS文件

外部的.js文件
var 函数名 = (function (){//函数体
})();export {函数名
}VUE组件内部
<script>import {函数名} from '路径'export default {}
</script>

挂号级别管理：增删改查完成了
科室管理：增删查cnpm install
cnpm run serve

LeID, DelMark) values" +
" (#{id},#{userName},#{password},#{realName},#{useType},#{docTitleId},#{isScheduling},#{deptId},#{registLeId},#{delMark})")
int insertUser(User user);

@Update("<script>update User set delmark=1 where id in" +"<foreach collection=\"array\" item=\"eno\" open=\"(\" close=\")\" separator=\",\">" +"#{eno}</foreach>" +"</script>")
int deletesById(int[] arr);@Delete("delete from user where ID=#{id}")
int deleteUserByID(int id);

}

进行模糊查询
and realname like concat(‘%’,#{name},‘%’)

控制器是直接和前端进行交互的

## 5.前后端交互

只有axios可以从前端获取后端数据
this.$axios.get().then()


### 5.1处理指向冲突

created() {
let that = this //处理指向冲突
this.KaTeX parse error: Expected '}', got 'EOF' at end of input: …，this指代的就是this.axios了
})
}


### 5.2VUE导入外部的JS文件

外部的.js文件
var 函数名 = (function (){
//函数体
})();

export {
函数名
}

VUE组件内部

挂号级别管理：增删改查完成了
科室管理：增删查

cnpm install
cnpm run serve

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