Anthony的技术博客

搭建使用阿里云,或者腾讯等轻量云服务器,一键搭建 教程WordPress地址和站点地址的含义和区别WordPress 地址没有子站点就忽略,和站点地址一样就行站点地址就是浏览器地址栏输入的地址 如果地址填入错误,导致不能进入网站,需要手动修改数据库 1select option_name,option_value from options where option_name = 'siteurl' or option_name='home' 在云服务器控制面板强制重启,导致数据无法启动12rm -f /www/server/data/ib_*rm -f /www/server/data/mysql-bin* 常用的插件 插件 Elementor Essential Addons for Elementor SMTP Mailer Starter Templates Yoast SEO

表单验证简单版123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899<template> <div class="login"> <el-card class="box-card"> <div slot="header" class="clearfix"> <span>通用后台管理系统</span> </div> <el-form label-width="80px" :model="form" ref="form"> <el-form-item label="用户名" prop="username" :rules="[ {required:true,message:'请输入用户名',trigger:'blur'}, {min:6,max:12,message:'长度在6-12位字符',trigger:'blur'}, ]"> <el-input v-model="form.username"></el-input> </el-form-item> <el-form-item label="密码" prop="password" :rules="[ {required:true,message:'请输入密码',trigger:'blur'}, {min:6,max:12,message:'长度在6-12位字符',trigger:'blur'}, ]"> <el-input type="password" v-model="form.password"></el-input> </el-form-item> <el-form-item> <el-button type="primary" @click="login('form')">登录</el-button> </el-form-item> </el-form> </el-card> </div></template><script>export default { data() { return { form: { username: "", password: "" } } }, methods:{ login(form){ this.$refs[form].validate((valid)=>{ if(valid){ console.log("验证通过") this.axios.post("http://localhost",this.form).then( res=>{ console.log(res) if(res.data.status === 200){ localStorage.setItem("username",res.data.username) this.$message({ message:res.data.message, type:'success' }) this.$router.push('/home') } } ) .catch(err=>{ console.error(err) }) }else { console.error("验证不通过") } }) } }}</script><style scoped lang="scss">.login { width: 100%; height: 100%; position: absolute; background: cadetblue; .box-card { width: 450px; margin: 200px auto; .el-button { width: 100%; } }}</style> 自定义校验123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119<template> <div class="login"> <el-card class="box-card"> <div slot="header" class="clearfix"> <span>通用后台管理系统</span> </div> <el-form label-width="80px" :model="form" :rules="rules" ref="form"> <el-form-item label="用户名" prop="username"> <el-input v-model="form.username"></el-input> </el-form-item> <el-form-item label="密码" prop="password"> <el-input type="password" v-model="form.password"></el-input> </el-form-item> <el-form-item> <el-button type="primary" @click="login('form')">登录</el-button> </el-form-item> </el-form> </el-card> </div></template><script>export default { data() { // 验证用户名 const validateName = (rule, value, callback) => { if (value === '') { callback(new Error("请输入用户名")) } else if (value === '123456') { console.log("11111111111") callback(new Error('换个用户名,猜到啦')) } else { callback() } } const validatePassword = (rule, value, callback) => { if (value === '') { callback(new Error("请输入密码")) } else if (!value === '123456') { callback(new Error('换个密码,猜到啦')) } else { callback() } } return { form: { username: "", password: "" }, rules: { username: [{validator: validateName, trigger: 'blur'}], password: [{validator: validatePassword, trigger: 'blur'}], } } }, methods: { login(form) { this.$refs[form].validate((valid) => { if (valid) { console.log("验证通过") // this.axios.post("http://localhost", this.form).then( // res => { // console.log(res) // if (res.data.status === 200) { // localStorage.setItem("username", res.data.username) // this.$message({ // message: res.data.message, // type: 'success' // }) // this.$router.push('/home') // } // } // ) // .catch(err => { // console.error(err) // }) } else { console.error("验证不通过") } }) } }}</script><style scoped lang="scss">.login { width: 100%; height: 100%; position: absolute; background: cadetblue; .box-card { width: 450px; margin: 200px auto; .el-button { width: 100%; } }}</style> 自定义校验封装新建一个vaildate.js 123456789101112131415161718192021// 用户名匹配export function nameRule(rule,value,callback){ if (value === '') { callback(new Error("请输入用户名")) } else if (value === '123456') { console.log("11111111111") callback(new Error('换个用户名,猜到啦')) } else { callback() }}export function passwordRule(rule,value,callback){ if (value === '') { callback(new Error("请输入密码")) } else if (value === '123456') { callback(new Error('换个密码,猜到啦')) } else { callback() }} 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697<template> <div class="login"> <el-card class="box-card"> <div slot="header" class="clearfix"> <span>通用后台管理系统</span> </div> <el-form label-width="80px" :model="form" :rules="rules" ref="form"> <el-form-item label="用户名" prop="username"> <el-input v-model="form.username"></el-input> </el-form-item> <el-form-item label="密码" prop="password"> <el-input type="password" v-model="form.password"></el-input> </el-form-item> <el-form-item> <el-button type="primary" @click="login('form')">登录</el-button> </el-form-item> </el-form> </el-card> </div></template><script>import {nameRule,passwordRule} from "@/utils/vaildate";export default { data() { return { form: { username: "", password: "" }, rules: { username: [{validator: nameRule, trigger: 'blur'}], password: [{validator: passwordRule, trigger: 'blur'}], } } }, methods: { login(form) { this.$refs[form].validate((valid) => { if (valid) { console.log("验证通过") // this.axios.post("http://localhost", this.form).then( // res => { // console.log(res) // if (res.data.status === 200) { // localStorage.setItem("username", res.data.username) // this.$message({ // message: res.data.message, // type: 'success' // }) // this.$router.push('/home') // } // } // ) // .catch(err => { // console.error(err) // }) } else { console.error("验证不通过") } }) } }}</script><style scoped lang="scss">.login { width: 100%; height: 100%; position: absolute; background: cadetblue; .box-card { width: 450px; margin: 200px auto; .el-button { width: 100%; } }}</style> 遍历路由渲染菜单栏src>common>menu.vue 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869<template> <div class="menu"> <el-aside width="200px"> <el-menu router default-active="2" class="el-menu-vertical-demo" background-color="cornflowerblue" text-color="#fff" active-text-color="#ffd04b"> <template v-for="(item,index) in menus"> <div> <el-submenu :index="index + '' " :key="index" v-if="!item.hidden"> <template slot="title"> <i :class="item.iconClass"></i> <span>{{ item.name }}</span> </template> <el-menu-item-group v-for="(child,index) in item.children" :key="index"> <el-menu-item :index="child.path"> <i :class="child.iconClass"></i> {{ child.name }} </el-menu-item> </el-menu-item-group> </el-submenu> </div> </template> </el-menu> </el-aside> </div></template><script>export default { data(){ return{ menus:[] } }, created() { console.log(this.$router.options.routes) this.menus=this.$router.options.routes }, methods: { }}</script><style scoped lang="scss">.menu{ .el-aside{ height: 100%; .el-menu{ height: 100%; .fa{ margin-right: 10px; } } .el-submenu .el-menu-item{ min-width: 0; } }}</style> route.js 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136import Vue from 'vue'import Router from 'vue-router'// import Home from '../components/Home.vue'Vue.use(Router)export default new Router({ routes:[ { path:'/', // 重定向 redirect:'/login', // 路由懒加载 hidden:true, component:()=>import('@/components/Login.vue') // 异步组件 }, { path:'/login', name:'Login', hidden:true, // 路由懒加载 component:()=>import('@/components/Login.vue') // 异步组件 }, { path:'/home', // component:Home hidden:true, // 路由懒加载 component:()=>import('@/components/Home.vue') // 异步组件 }, { path:'/home2', // component:Home hidden:true, // 路由懒加载 component:resolve =>require(['@/components/Home.vue'],resolve) // 异步组件 }, { path:'*', hidden:true, // 路由懒加载 component:()=>import('@/components/404.vue') }, { path:"/home", name:"学生管理", iconClass:'fa fa-user', // 默认重定向 redirect:'/home/student', component:()=>import('@/components/Home.vue'), children:[ { path:'/home/student', name:'学生列表', iconClass:"fa fa-list", component:()=>import("@/components/students/StudentList.vue") }, { path:'/home/info', name:'信息列表', iconClass:"fa fa-list", component:()=>import("@/components/students/InfoList.vue") }, { path:'/home/infos', name:'信息管理', iconClass:"fa fa-list-alt", component:()=>import("@/components/students/InfoLists.vue") }, { path:'/home/work', name:'作业列表', iconClass:"fa fa-list-ul", component:()=>import("@/components/students/WorkList.vue") }, { path:'/home/workd', name:'作业管理', iconClass:"fa fa-th-list", component:()=>import("@/components/students/WorkMent.vue") } ] }, { path:"/home", name:"数据分析", iconClass:'fa fa-bar-chart', component:()=>import('@/components/Home.vue'), children:[ { path:'/home/dataview', name:'数据概览', iconClass:"fa fa-list-alt", component:()=>import("@/components/dataAnalysis/DataView.vue") }, { path:'/home/mapview', name:'地图概览', iconClass:"fa fa-list-alt", component:()=>import("@/components/dataAnalysis/MapView.vue") }, { path:'/home/travel', name:'信息管理', iconClass:"fa fa-list-alt", component:()=>import("@/components/dataAnalysis/TraveMap.vue") }, { path:'/home/score', name:'分数地图', iconClass:"fa fa-list-alt", component:()=>import("@/components/dataAnalysis/ScoreMap.vue") } ] }, { path:"/users", name:"用户中心", iconClass:'fa fa-user', component:()=>import('@/components/Home.vue'), children:[ { path:'/users/user', name:'权限管理', iconClass:"fa fa-user", component:()=>import("@/components/users/User.vue") } ] }, ], mode:'history'}) 面包屑的使用不同的路由,面包屑显示的信息会自动变化bread.vue 12345678910111213141516171819202122<template> <div> <el-card> <el-breadcrumb separator="/"> <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item> <el-breadcrumb-item v-for="(item,index) in $route.matched" :key="index" >{{item.name}}</el-breadcrumb-item> </el-breadcrumb> </el-card> </div></template><script>export default {}</script><style scoped></style> home.vue 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859<template> <div class="home"> <Header></Header> <el-container class="content"> <Menu>menu</Menu> <el-container> <el-main> <Breadcrumb/> <div class="cont"> <router-view></router-view> </div> </el-main> <el-footer> <Footer></Footer> </el-footer> </el-container> </el-container> </div></template><script>import Header from "@/components/common/Header.vue";import Footer from "@/components/common/Footer.vue";import Menu from "@/components/common/Menu.vue";import Breadcrumb from '@/components/common/Breadcrumb.vue'export default { components: { Header, Footer, Breadcrumb, Menu, }, data() { return {} }}</script><!-- Add "scoped" attribute to limit CSS to this component only --><style scoped lang="less">.home { width: 100%; height: 100%; .content{ position: absolute; width: 100%; top: 60px; bottom: 0; .cont{ margin: 20px 0; } }}</style> Card 卡片12345<!-- body-style的使用 --><el-card :body-style="{padding:'0px'}"> <div style="padding-top: 4px;display: flex"> </div</div></el-card> 级联选择器新版本props的使用级联选择器太高可以在全局样式里给.el-cascader-panel设置高度为200px:props=”{ expandTrigger: ‘hover’, value: ‘cat_id’, label: ‘cat_name’, children: ‘children’ }” 多选框 1234567891011121314151617<div> <el-checkbox-group v-model="checkboxGroup1"> <el-checkbox-button v-for="city in cities" :label="city" :key="city">{{city}}</el-checkbox-button> </el-checkbox-group></div>const cityOptions = ['上海', '北京', '广州', '深圳']; export default { data () { return { checkboxGroup1: ['上海'], checkboxGroup2: ['上海'], checkboxGroup3: ['上海'], checkboxGroup4: ['上海'], cities: cityOptions }; } Avatar 头像12<el-avatar shape="square" size="small" src="https://baidu.com/logo"></el-avatar> Table 表格el-table怎样隐藏某一列el-table-column上添加v-if="false" 1234567891011121314151617181920212223<el-table v-loading="loading" :data="bczglList" @selection-change="handleSelectionChange"> <el-table-column label="id" align="center" prop="id" v-if="false" /> <el-table-column label="班次组编号" align="center" prop="bczbh" /> <el-table-column label="操作" align="center" class-name="small-padding fixed-width"> <template slot-scope="scope"> <el-button size="mini" type="text" icon="el-icon-edit" @click="handleUpdate(scope.row)" v-hasPermi="['kqgl:bczgl:edit']" >修改</el-button> <el-button size="mini" type="text" icon="el-icon-delete" @click="handleDelete(scope.row)" v-hasPermi="['kqgl:bczgl:remove']" >删除</el-button> </template> </el-table-column></el-table> 先记着Vue同一个dom元素绑定多个点击事件如何绑定 1<el-button @click="dialogVisible = false;clearTempData()">取 消</el-button> 模板获取值 123<template slot-scope="scope"> <el-tag type="warning" v-for="ids in scope.row.typeID.split(',')">{{getGameType(ids)}}</el-tag></template> Store 数据 1agentId: _this.$store.getters.name.agentId,

插件1.安装git插件2.运行命令,才能在界面上显示Git 设置打开文件的时候,显示的模式 本地图片的格式使用 Obsidian 时，粘贴的图片路径会变成[[]] 的格式，在像 Typora 的软件上，就不适配。可以在设置里，关闭 Wiki 链接的选项，粘贴图片后的格式就会自动变成了。

内链内链图片相对路径在source/下创建一个图片的目录,比如起名叫img的文件夹在文章中引入 比如 第二种相对路径将_config.yml文件中的配置项post_asset_folder设为true后，执行命令 1$ hexo new post_name 在source/_posts中会生成文章post_name.md和同名文件夹post_name。将图片资源放在post_name中，文章就可以使用相对路径引用图片资源了。 1 如果有遇到问题参考:Hexo博客搭建之在文章中插入图片 内链文章相对路径比如我的博客:[需要显示的文字](../310/#CloudFront加速Vercel) ../ 相对路径,不是md文件的相对路径,是生成的public文件夹你的文章和内链文章的相对路径 310 是指abbrlink: 310,如果没有就使用标题 #CloudFront加速Vercel 是指 310这篇文章的#CloudFront加速Vercel这个标题,也可以不用写,如果写了,就会自动跳到页面的这个锚点

服务器硬盘扩容在线硬盘扩容 阿里云OSS+AWS CloudfrontCloudFront加速Vercel

关闭IPV6 12345curl -X PATCH "https://api.cloudflare.com/client/v4/zones/cfa068f2a1e282a2731ba29a0a24b052/settings/ipv6" \ -H "X-Auth-Email: [email protected]" \ -H "X-Auth-Key: 830419c40277b1cff929397d7c08b2012c2a" \ -H "Content-Type: application/json" \ --data '{"value":"off"}' URL上的地址: X-Auth-Key:

下载离线安装包 12345# 解压tzr -zxvf harbo.xxxxx.tgz# cp 下模板文件cp ./harbor.yml.tmpl ./harbor.yml 修改配置文件1sudo vim harbor.yml 123456789101112131415161718192021222324252627282930313233343536373839# 有域名就弄域名,这里是在内网就用的iphostname: 10.0.2.4# http related confighttp: # port for http, default is 80. If https enabled, this port will redirect to https port port: 80# 内网不需要https,https和证书就注释了# https related config#https: # https port for harbor, default is 443 # port: 443 # The path of cert and key files for nginx # certificate: /your/certificate/path # private_key: /your/private/key/path# Uncomment external_url if you want to enable external proxy# And when it enabled the hostname will no longer used# external_url: https://reg.mydomain.com:8433# The initial password of Harbor admin# It only works in first time to install harbor# Remember Change the admin password from UI after launching Harbor.harbor_admin_password: 123456# Harbor DB configurationdatabase: # The password for the root user of Harbor DB. Change this before any production use. password: root123 # The maximum number of connections in the idle connection pool. If it <=0, no idle connections are retained. max_idle_conns: 50 # The maximum number of open connections to the database. If it <= 0, then there is no limit on the number of open connections. # Note: the default number of connections is 100 for postgres. max_open_conns: 100# The default data volume# 这里要配置好目录data_volume: /home/yunxian/harbor/data 运行12345# 每次修改完配置文件后都需要运行./prepare# 运行./install.sh 访问访问:http://10.0.2.4/ 账号密码:admin / 123456 解决客户端的https问题1234[root@client ~]# docker login 10.19.46.15Username: adminPassword: Error response from daemon: Get https://10.19.46.15/v2/: dial tcp 10.19.46.15:443: connect: connection refused 这是因为docker1.3.2版本开始默认docker registry使用的是https，我们设置Harbor默认http方式，所以当执行用docker login、pull、push等命令操作非https的docker regsitry的时就会报错。 解决办法 vim docker-compose.yml 编辑客户端 1234567891011vim /etc/docker/daemon.json{ "insecure-registries": [ "10.19.46.15(harbor的IP)" ]}# 重启dockersystemctl daemon-reloadsystemctl restart docker 再次登录 1234567[root@client ~]# docker login 10.19.46.15 Username: adminPassword: WARNING! Your password will be stored unencrypted in /root/.docker/config.json.Configure a credential helper to remove this warning. Seehttps://docs.docker.com/engine/reference/commandline/login/#credentials-storeLogin Succeeded 技巧pull 的命令 推送和打tag的命令

基础注释作用：在代码中加一些说明和解释，方便自己或其他程序员程序员阅读代码 123// 单行注释/* 多行注释 */ 提示：编译器在编译代码时，会忽略注释的内容 变量作用：给一段指定的内存空间起名，方便操作这段内存 语法：数据类型 变量名 = 初始值; 12345678910111213141516#include<iostream>using namespace std;int main() { //变量的定义 //语法：数据类型 变量名 = 初始值 int a = 10; cout << "a = " << a << endl; system("pause"); return 0;} 注意：C++在创建变量时，必须给变量一个初始值，否则会报错 常量作用：用于记录程序中不可更改的数据 C++定义常量两种方式 #define 宏常量： #define 常量名 常量值` 通常在文件上方定义，表示一个常量 const修饰的变量 const 数据类型 常量名 = 常量值 通常在变量定义前加关键字const，修饰该变量为常量，不可修改 1234567891011121314151617//1、宏常量#define day 7int main() { cout << "一周里总共有 " << day << " 天" << endl; //day = 8; //报错，宏常量不可以修改 //2、const修饰变量 const int month = 12; cout << "一年里总共有 " << month << " 个月份" << endl; //month = 24; //报错，常量是不可以修改的 system("pause"); return 0;} 标识符命名规则 标识符不能是关键字 标识符只能由字母、数字、下划线组成 第一个字符必须为字母或下划线 标识符中字母区分大小写 sizeof关键字**作用：**利用sizeof关键字可以统计数据类型所占内存大小 语法： sizeof( 数据类型 / 变量) 1234567891011121314int main() { cout << "short 类型所占内存空间为： " << sizeof(short) << endl; cout << "int 类型所占内存空间为： " << sizeof(int) << endl; cout << "long 类型所占内存空间为： " << sizeof(long) << endl; cout << "long long 类型所占内存空间为： " << sizeof(long long) << endl; system("pause"); return 0;} 整型结论：short < int <= long <= long long 浮点型作用：用于表示小数 浮点型变量分为两种： 单精度float 双精度double 两者的区别在于表示的有效数字范围不同。 12345678910111213141516171819202122int main() { float f1 = 3.14f; double d1 = 3.14; cout << f1 << endl; cout << d1<< endl; cout << "float sizeof = " << sizeof(f1) << endl; cout << "double sizeof = " << sizeof(d1) << endl; //科学计数法 float f2 = 3e2; // 3 * 10 ^ 2 cout << "f2 = " << f2 << endl; float f3 = 3e-2; // 3 * 0.1 ^ 2 cout << "f3 = " << f3 << endl; system("pause"); return 0;} 字符串型作用：用于表示一串字符 两种风格 C风格字符串： char 变量名[] = "字符串值"示例： 123456789int main() { char str1[] = "hello world"; cout << str1 << endl; system("pause"); return 0;} 注意：C风格的字符串要用双引号括起来 C++风格字符串： string 变量名 = "字符串值"示例： 123456789int main() { string str = "hello world"; cout << str << endl; system("pause"); return 0;} 注意：C++风格字符串，需要加入头文件==#include== 布尔类型**作用：**布尔数据类型代表真或假的值 bool类型只有两个值： true — 真（本质是1） false — 假（本质是0） 1234567891011121314int main() { bool flag = true; cout << flag << endl; // 1 flag = false; cout << flag << endl; // 0 cout << "size of bool = " << sizeof(bool) << endl; //1 system("pause"); return 0;} 数据的输入作用：用于从键盘获取数据 **关键字：**cin 语法： cin >> 变量 12345678910111213141516171819202122232425262728293031323334int main(){ //整型输入 int a = 0; cout << "请输入整型变量：" << endl; cin >> a; cout << a << endl; //浮点型输入 double d = 0; cout << "请输入浮点型变量：" << endl; cin >> d; cout << d << endl; //字符型输入 char ch = 0; cout << "请输入字符型变量：" << endl; cin >> ch; cout << ch << endl; //字符串型输入 string str; cout << "请输入字符串型变量：" << endl; cin >> str; cout << str << endl; //布尔类型输入 bool flag = true; cout << "请输入布尔型变量：" << endl; cin >> flag; cout << flag << endl; system("pause"); return EXIT_SUCCESS;} if语句12345678910111213141516171819202122int main() { //选择结构-单行if语句 //输入一个分数，如果分数大于600分，视为考上一本大学，并在屏幕上打印 int score = 0; cout << "请输入一个分数：" << endl; cin >> score; cout << "您输入的分数为： " << score << endl; //if语句 //注意事项，在if判断语句后面，不要加分号 if (score > 600) { cout << "我考上了一本大学！！！" << endl; } system("pause"); return 0;} 123456789101112131415161718192021int main() { int score = 0; cout << "请输入考试分数：" << endl; cin >> score; if (score > 600) { cout << "我考上了一本大学" << endl; } else { cout << "我未考上一本大学" << endl; } system("pause"); return 0;} 1234567891011121314151617181920212223242526272829 int main() { int score = 0; cout << "请输入考试分数：" << endl; cin >> score; if (score > 600) { cout << "我考上了一本大学" << endl; } else if (score > 500) { cout << "我考上了二本大学" << endl; } else if (score > 400) { cout << "我考上了三本大学" << endl; } else { cout << "我未考上本科" << endl; } system("pause"); return 0;} switch语句12345678910111213141516171819202122232425262728293031323334int main() { //请给电影评分 //10 ~ 9 经典 // 8 ~ 7 非常好 // 6 ~ 5 一般 // 5分以下 烂片 int score = 0; cout << "请给电影打分" << endl; cin >> score; switch (score) { case 10: case 9: cout << "经典" << endl; break; case 8: cout << "非常好" << endl; break; case 7: case 6: cout << "一般" << endl; break; default: cout << "烂片" << endl; break; } system("pause"); return 0;} while循环语句12345678910111213int main() { int num = 0; while (num < 10) { cout << "num = " << num << endl; num++; } system("pause"); return 0;} do…while123456789101112131415int main() { int num = 0; do { cout << num << endl; num++; } while (num < 10); system("pause"); return 0;} for1234567891011int main() { for (int i = 0; i < 10; i++) { cout << i << endl; } system("pause"); return 0;} break12345678910111213141516171819int main() { //在嵌套循环语句中使用break，退出内层循环 for (int i = 0; i < 10; i++) { for (int j = 0; j < 10; j++) { if (j == 5) { break; } cout << "*" << " "; } cout << endl; } system("pause"); return 0;} continue123456789101112131415int main() { for (int i = 0; i < 100; i++) { if (i % 2 == 0) { continue; } cout << i << endl; } system("pause"); return 0;} goto123456789101112131415161718int main() { cout << "1" << endl; goto FLAG; cout << "2" << endl; cout << "3" << endl; cout << "4" << endl; FLAG: cout << "5" << endl; system("pause"); return 0;} 一维数组123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051int main() { //定义方式1 //数据类型 数组名[元素个数]; int score[10]; //利用下标赋值 score[0] = 100; score[1] = 99; score[2] = 85; //利用下标输出 cout << score[0] << endl; cout << score[1] << endl; cout << score[2] << endl; //第二种定义方式 //数据类型 数组名[元素个数] = {值1，值2 ，值3 ...}; //如果{}内不足10个数据，剩余数据用0补全 int score2[10] = { 100, 90,80,70,60,50,40,30,20,10 }; //逐个输出 //cout << score2[0] << endl; //cout << score2[1] << endl; //一个一个输出太麻烦，因此可以利用循环进行输出 for (int i = 0; i < 10; i++) { cout << score2[i] << endl; } //定义方式3 //数据类型 数组名[] = {值1，值2 ，值3 ...}; int score3[] = { 100,90,80,70,60,50,40,30,20,10 }; for (int i = 0; i < 10; i++) { cout << score3[i] << endl; } //数组名用途 int arr[10] = { 1,2,3,4,5,6,7,8,9,10 }; cout << "整个数组所占内存空间为： " << sizeof(arr) << endl; cout << "每个元素所占内存空间为： " << sizeof(arr[0]) << endl; cout << "数组的元素个数为： " << sizeof(arr) / sizeof(arr[0]) << endl; system("pause"); return 0;} 函数12345678910111213141516171819202122232425//函数定义int add(int num1, int num2) //定义中的num1,num2称为形式参数，简称形参{ int sum = num1 + num2; return sum;}int main() { int a = 10; int b = 10; //调用add函数 int sum = add(a, b);//调用时的a，b称为实际参数，简称实参 cout << "sum = " << sum << endl; a = 100; b = 100; sum = add(a, b); cout << "sum = " << sum << endl; system("pause"); return 0;} 值传递12345678910111213141516171819202122232425262728293031void swap(int num1, int num2){ cout << "交换前：" << endl; cout << "num1 = " << num1 << endl; cout << "num2 = " << num2 << endl; int temp = num1; num1 = num2; num2 = temp; cout << "交换后：" << endl; cout << "num1 = " << num1 << endl; cout << "num2 = " << num2 << endl; //return ; 当函数声明时候，不需要返回值，可以不写return}int main() { int a = 10; int b = 20; swap(a, b); cout << "mian中的 a = " << a << endl; cout << "mian中的 b = " << b << endl; system("pause"); return 0;} 函数的声明告诉编译器函数名称及如何调用函数。函数的实际主体可以单独定义。 函数的声明可以多次，但是函数的定义只能有一次 123456789101112131415161718192021//声明可以多次，定义只能一次//声明int max(int a, int b);int max(int a, int b);//定义int max(int a, int b){ return a > b ? a : b;}int main() { int a = 100; int b = 200; cout << max(a, b) << endl; system("pause"); return 0;} 函数的分文件编写函数分文件编写一般有4个步骤 创建后缀名为.h的头文件 创建后缀名为.cpp的源文件 在头文件中写函数的声明 在源文件中写函数的定义 123456//swap.h文件#include<iostream>using namespace std;//实现两个数字交换的函数声明void swap(int a, int b); 123456789101112//swap.cpp文件#include "swap.h"void swap(int a, int b){ int temp = a; a = b; b = temp; cout << "a = " << a << endl; cout << "b = " << b << endl;} 123456789101112//main函数文件#include "swap.h"int main() { int a = 100; int b = 200; swap(a, b); system("pause"); return 0;} 指针变量的定义和使用123456789101112131415161718192021int main() { //1、指针的定义 int a = 10; //定义整型变量a //指针定义语法： 数据类型 * 变量名 ; int * p; //指针变量赋值 p = &a; //指针指向变量a的地址 cout << &a << endl; //打印数据a的地址 cout << p << endl; //打印指针变量p //2、指针的使用 //通过*操作指针变量指向的内存 cout << "*p = " << *p << endl; system("pause"); return 0;} 指针变量和普通变量的区别 普通变量存放的是数据,指针变量存放的是地址 指针变量可以通过” * “操作符，操作指针变量指向的内存空间，这个过程称为解引用 总结1： 我们可以通过 & 符号 获取变量的地址 总结2：利用指针可以记录地址 总结3：对指针变量解引用，可以操作指针指向的内存 指针所占内存空间1234567891011121314151617int main() { int a = 10; int * p; p = &a; //指针指向数据a的地址 cout << *p << endl; //* 解引用 cout << sizeof(p) << endl; cout << sizeof(char *) << endl; cout << sizeof(float *) << endl; cout << sizeof(double *) << endl; system("pause"); return 0;} 总结：所有指针类型在32位操作系统下是4个字节 空指针和野指针空指针：指针变量指向内存中编号为0的空间 **用途：**初始化指针变量 **注意：**空指针指向的内存是不可以访问的 示例1：空指针 12345678910111213int main() { //指针变量p指向内存地址编号为0的空间 int * p = NULL; //访问空指针报错 //内存编号0 ~255为系统占用内存，不允许用户访问 cout << *p << endl; system("pause"); return 0;} 示例2：野指针 123456789101112int main() { //指针变量p指向内存地址编号为0x1100的空间 int * p = (int *)0x1100; //访问野指针报错 cout << *p << endl; system("pause"); return 0;} 总结：空指针和野指针都不是我们申请的空间，因此不要访问。 const修饰指针const修饰指针有三种情况 const修饰指针 — 常量指针 const修饰常量 — 指针常量 const即修饰指针，又修饰常量 示例： 123456789101112131415161718192021222324int main() { int a = 10; int b = 10; //const修饰的是指针，指针指向可以改，指针指向的值不可以更改 const int * p1 = &a; p1 = &b; //正确 //*p1 = 100; 报错 //const修饰的是常量，指针指向不可以改，指针指向的值可以更改 int * const p2 = &a; //p2 = &b; //错误 *p2 = 100; //正确 //const既修饰指针又修饰常量 const int * const p3 = &a; //p3 = &b; //错误 //*p3 = 100; //错误 system("pause"); return 0;} 技巧：看const右侧紧跟着的是指针还是常量, 是指针就是常量指针，是常量就是指针常量 指针和数组**作用：**利用指针访问数组中元素 示例： 1234567891011121314151617181920int main() { int arr[] = { 1,2,3,4,5,6,7,8,9,10 }; int * p = arr; //指向数组的指针 cout << "第一个元素： " << arr[0] << endl; cout << "指针访问第一个元素： " << *p << endl; for (int i = 0; i < 10; i++) { //利用指针遍历数组 cout << *p << endl; p++; } system("pause"); return 0;} 指针和函数**作用：**利用指针作函数参数，可以修改实参的值 示例： 12345678910111213141516171819202122232425262728293031//值传递void swap1(int a ,int b){ int temp = a; a = b; b = temp;}//地址传递void swap2(int * p1, int *p2){ int temp = *p1; *p1 = *p2; *p2 = temp;}int main() { int a = 10; int b = 20; swap1(a, b); // 值传递不会改变实参 swap2(&a, &b); //地址传递会改变实参 cout << "a = " << a << endl; cout << "b = " << b << endl; system("pause"); return 0;} 总结：如果不想修改实参，就用值传递，如果想修改实参，就用地址传递 结构体定义和使用语法：struct 结构体名 { 结构体成员列表 }； 通过结构体创建变量的方式有三种： struct 结构体名 变量名 struct 结构体名 变量名 = { 成员1值 ， 成员2值…} 定义结构体时顺便创建变量 示例： 1234567891011121314151617181920212223242526272829303132333435//结构体定义struct student{ //成员列表 string name; //姓名 int age; //年龄 int score; //分数}stu3; //结构体变量创建方式3int main() { //结构体变量创建方式1 struct student stu1; //struct 关键字可以省略 stu1.name = "张三"; stu1.age = 18; stu1.score = 100; cout << "姓名：" << stu1.name << " 年龄：" << stu1.age << " 分数：" << stu1.score << endl; //结构体变量创建方式2 struct student stu2 = { "李四",19,60 }; cout << "姓名：" << stu2.name << " 年龄：" << stu2.age << " 分数：" << stu2.score << endl; stu3.name = "王五"; stu3.age = 18; stu3.score = 80; cout << "姓名：" << stu3.name << " 年龄：" << stu3.age << " 分数：" << stu3.score << endl; system("pause"); return 0;} 总结1：定义结构体时的关键字是struct，不可省略 总结2：创建结构体变量时，关键字struct可以省略 总结3：结构体变量利用操作符 ‘’.’’ 访问成员 结构体指针**作用：**通过指针访问结构体中的成员 利用操作符 >可以通过结构体指针访问结构体属性 示例： 1234567891011121314151617181920212223//结构体定义struct student{ //成员列表 string name; //姓名 int age; //年龄 int score; //分数};int main() { struct student stu = { "张三",18,100, }; struct student * p = &stu; p->score = 80; //指针通过 -> 操作符可以访问成员 cout << "姓名：" << p->name << " 年龄：" << p->age << " 分数：" << p->score << endl; system("pause"); return 0;} 总结：结构体指针可以通过 -> 操作符 来访问结构体中的成员 选择创建新项目–>空项目 函数 如果不体现生命,main方法 在函数的前面就会报错 有了函数的声明,main方法,可以写在函数的前面 函数的民生,可以写很多次,但是实现(定义)只能写一次 123456789101112131415161718192021222324#include <iostream>using namespace std;// 提前告诉编译器// 函数的民生,可以写很多次,但是实现(定义)只能写一次int max(int num1, int num2);int max(int num1, int num2);int max(int num1, int num2);int main(){ int sum = max(1, 2); cout << "计算器的结果:" << sum << endl; system("pause"); return 0;}int max(int num1, int num2) { int sum = num1 + num2; return sum;} 常量指针 特点:指针的指向可以改,指针指向的值不可以改 123const int * p = &a;*0 = 20 错误p = &b 对的 指针常量 特点:指针的指向不可以改,指针指向的值可以改 123int * const p = &a;*0 = 20 对的p = &b 错误 const 同时修饰指针和常量 123const int * const p = &a;*0 = 20 错的p = &b 错误 例子: 12345678910111213141516171819202122232425262728293031323334#include <iostream>using namespace std;int main(){ int a = 10; int b = 20; int* p = &a; cout << "第一个测试指针a地址:"<<p << "===" << *p << endl; int* p111 = &b; cout << "第一个测试指针b地址:"<< p111 << "===" << *p111 << endl; // const 修饰指针 const int* p1 = &a; // *p=20 错误 cout << "第二个测试指针地址:" << p1 << "===" << *p1 << endl; p1 = &b; cout << "第二个测试指针地址:" << p1 << "===" << *p1 << endl; // const 修饰常量 int* const p2 = &a; cout << "第三个测试指针地址:" << p2 << "===" << *p2 << endl; *p2=30; // p = &b; 错误 cout << "第三个测试指针地址:" << p2 << "===" << *p2 << endl; // const 修饰指针和常量 const int* const p3 = &a; system("pause"); return 0;}

手动安装7.x手动安装单机ElasticSearch7.x123456789101112131415161718192021222324252627282930# 下载tar包,(6.6.2)wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.6.2.tar.gz# 解压缩之后修改配置文件vi /elasticsearch-7.10.1/config/elasticsearch.ymlnetwork.host: 0.0.0.0 #设置成外网也可以访问# 追加内容,修改系统环境该变量,修改完需要重启才能生效vi /etc/sysctl.confvm.max_map_count=262144# 加载参数anthony@base:/usr/local/elasticsearch-6.6.2$ sudo sysctl -pvm.max_map_count = 262144# 允许打开的最大文件描述,加入vim /etc/security/limits.conf* soft nofile 65536* hard nofile 65536* soft nproc 4096 或者(65536)* hard nproc 4096 或者(65536)# 修改JVM分配大小 这两个值要一致vi config/jvm.options-Xms4g-Xmx4g# 启动bin/elasticsearchbin/elasticsearch -d #后台启动 安装分词器下载解压缩的哦elasticsearch的plugin目录下IK分词器https://github.com/medcl/elasticsearch-analysis-ik/releases/tag/v6.6.2 1POST /_analyze { "analyzer": "ik_smart", "text": " 程序员 } 拼音分词器https://github.com/medcl/elasticsearch-analysis-pinyin/releases/tag/v6.6.2 12345GET /medcl/_analyze { "text": ["程序员"], "analyzer": "pinyin_analyzer" } 报错原因: 1234567891011# chown -R 用户名:用户名 目录名Exception in thread "main" java.nio.file.AccessDeniedException: /root/home/searchengine/elasticsearch-6.2.4/config/jvm.options at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107) at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214) at java.nio.file.Files.newByteChannel(Files.java:361) at java.nio.file.Files.newByteChannel(Files.java:407) at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384) at java.nio.file.Files.newInputStream(Files.java:152) at org.elasticsearch.tools.launchers.JvmOptionsParser.main(JvmOptionsParser.java:58) 手动安装集群ElasticSearch7.x1.修改一台elasticsearch的elasticsearch.yml 1234567891011cluster.name: kkb-esnode.name: node0node.master: truenetwork.host: 0.0.0.0http.port: 9200transport.tcp.port: 9300discovery.zen.ping.unicast.hosts: ["127.0.0.1:9300","127.0.0.1:9301","127.0.0.1:9302"]discovery.zen.minimum_master_nodes: 2http.cors.enabled: truehttp.cors.allow-origin: "*" 2.拷贝到其他的服务器 修改上面呢的配置文件中的3个配置 123node.name: node0http.port: 9200transport.tcp.port: 9300 3.检查健康状态 1http://localhost:9200/_cat/health?v 手动单机Kibana7.x安装1234567891011# 下载解压https://artifacts.elastic.co/downloads/kibana/kibana-6.6.2-linux-x86_64.tar.gz# 修改配置文件vi kibana-6.4.2-linux-x86_64/config/kibana.ymlserver.port: 5600server.host: "0.0.0.0"elasticsearch.url: "http://localhost:9200"# 启动,后台启动./bin/kibana & 手动单机Logstash7.x安装mysql-connector-java-5.1.48.jar是放在logstash-6.6.2/logstash-core/lib/jars,这样就不需要写相对路径了 12345678910111213141516171819202122input { jdbc { jdbc_driver_library => "mysql-connector-java-5.1.48.jar" jdbc_driver_class => "com.mysql.jdbc.Driver" jdbc_connection_string => "jdbc:mysql://192.168.111.128:3306/ssm" jdbc_user => "root" jdbc_password => "123456" jdbc_paging_enabled => "true" jdbc_page_size => "2" statement => "SELECT id,'name',phone FROM phone where update_data >= :sql_last_value" tracking_column_type => "timestamp" tracking_column => "update_date" schedule => "* * * * *" }}output { elasticsearch { index => "phone" document_id=> "%{id}" hosts => ["http://192.168.111.128:9200"] }} 启动命令 1./logstash -f ../config/logstash-sample.conf 手动安装8.x 📌 8.0 已经自带了jdk 二进制包安装ES安装12345# 下载包并解压wget https://xxxx.tar# 启动./elasticsearch./bin/elasticsearch 运行结果123456789101112131415161718192021✅ Elasticsearch security features have been automatically configured!✅ Authentication is enabled and cluster connections are encrypted.ℹ️ Password for the elastic user (reset with `bin/elasticsearch-reset-password -u elastic`): Shb2+OuCKthxFTxD-*jEℹ️ HTTP CA certificate SHA-256 fingerprint: ceb6add33653a4c8f3493bddde839cdfcf1035a3a50cb01247962495f15ea40fℹ️ Configure Kibana to use this cluster:• Run Kibana and click the configuration link in the terminal when Kibana starts.• Copy the following enrollment token and paste it into Kibana in your browser (valid for the next 30 minutes): eyJ2ZXIiOiI4LjAuMCIsImFkciI6WyIxMC4wLjIuNDo5MjAwIl0sImZnciI6ImNlYjZhZGQzMzY1M2E0YzhmMzQ5M2JkZGRlODM5Y2RmY2YxMDM1YTNhNTBjYjAxMjQ3OTYyNDk1ZjE1ZWE0MGYiLCJrZXkiOiJXaEV4SDM4QlZXV242cU9KejgxNTprUVliUEY0dlJfaU56MnRFaDlRY0hnIn0=ℹ️ Configure other nodes to join this cluster:• On this node: ⁃ Create an enrollment token with `bin/elasticsearch-create-enrollment-token -s node`. ⁃ Uncomment the transport.host setting at the end of config/elasticsearch.yml. ⁃ Restart Elasticsearch.• On other nodes: ⁃ Start Elasticsearch with `bin/elasticsearch --enrollment-token <token>`, using the enrollment token that you generated. 停止服务,修改配置文件然后输入：curl 127.0.0.1:9200,返回是： 12[hy@localhost ~]$ curl 127.0.0.1:9200curl: (52) Empty reply from server 而ES那边也有响应 123# 看来这和以前的7.1.1版本不一样了[2022-02-19T05:02:02,812][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [localhost.localdomain] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/127.0.0.1:9200, remoteAddress=/127.0.0.1:38518}[2022-02-19T05:02:27,144][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [localhost.localdomain] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/[0:0:0:0:0:0:0:1]:9200, remoteAddress=/[0:0:0:0:0:0:0:1]:56174} 修改配置文件 123456789# 需要把security features都关闭，否则http不对外服务了# true改成falsexpack.security.http.ssl: enabled: false keystore.path: certs/http.p12# Enable encryption and mutual authentication between cluster nodesxpack.security.transport.ssl: enabled: false 测试访问12http://localhost:9200需要输入账号和密码:elastic / Shb2+OuCKthxFTxD-*jE java访问测试12345<dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-client</artifactId> <version>8.0.0</version></dependency> 1234567891011121314151617181920212223242526272829@Bean(destroyMethod = "close")public RestClient restClient() throws CertificateException, IOException, KeyStoreException, NoSuchAlgorithmException, KeyManagementException { final CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("elastic", "VWFjE60dbpKIjbajGJQ4")); Path caCertificatePath = Paths.get("E:\\es\\elasticsearch-8.0.0-windows-x86_64\\elasticsearch-8.0.0\\config\\certs\\http_ca.crt"); CertificateFactory factory = CertificateFactory.getInstance("X.509"); Certificate trustedCa; try (InputStream is = Files.newInputStream(caCertificatePath)) { trustedCa = factory.generateCertificate(is); } KeyStore trustStore = KeyStore.getInstance("pkcs12"); trustStore.load(null, null); trustStore.setCertificateEntry("ca", trustedCa); SSLContextBuilder sslContextBuilder = SSLContexts.custom() .loadTrustMaterial(trustStore, null); final SSLContext sslContext = sslContextBuilder.build(); RestClientBuilder builder = RestClient.builder( new HttpHost("localhost", 9200, "https")) .setHttpClientConfigCallback(httpClientBuilder -> { httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider); return httpClientBuilder.setSSLContext(sslContext); }); return builder.build();} 1234567//注入client@AutowiredRestClient restClient;Request request = new Request("GET","/ess_book/_doc/1");Response response = restClient.performRequest(request);return EntityUtils.toString(response.getEntity()); 集群安装ES全栈开发之ElasticSearch8.0分布式搜索引擎集群及其高可用测试 - 掘金 安装Kibana安装报错max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] 123456vim /etc/sysctl.confvm.max_map_count=****262144# 使生效sysctl -p**** 安装插件安装HEADHead是elasticsearch的集群管理工具，可以用于数据的浏览和查询 (1)elasticsearch-head是一款开源软件，被托管在github上面，所以如果我们要使用它，必须先安装git，通过git获取elasticsearch-head (2)运行elasticsearch-head会用到grunt，而grunt需要npm包管理器，所以nodejs是必须要安装的 (3)elasticsearch5.0之后，elasticsearch-head不做为插件放在其plugins目录下了。使用git拷贝elasticsearch-head到本地 cd /usr/local/ git clone git://github.com/mobz/elasticsearch-head.git (4)安装elasticsearch-head依赖包 [root@localhost local]# npm install -g grunt-cli [root@localhost _site]# cd /usr/local/elasticsearch-head/ [root@localhost elasticsearch-head]# cnpm install (5)修改Gruntfile.js [root@localhost _site]# cd /usr/local/elasticsearch-head/ [root@localhost elasticsearch-head]# vi Gruntfile.js 在connect–>server–>options下面添加：hostname:’*’，允许所有IP可以访问 (6)修改elasticsearch-head默认连接地址[root@localhost elasticsearch-head]# cd /usr/local/elasticsearch-head/_site/ [root@localhost _site]# vi app.js 将this.base_uri = this.config.base_uri || this.prefs.get(“app-base_uri”) || “