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<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Code World - a world with love</title><meta name="author" content="独揽清风"><meta name="copyright" content="独揽清风"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta http-equiv="Cache-Control" content="no-transform"><meta http-equiv="Cache-Control" content="no-siteapp"><meta name="description" content="code world,not cold">
<meta property="og:type" content="website">
<meta property="og:title" content="Code World">
<meta property="og:url" content="http://example.com/index.html">
<meta property="og:site_name" content="Code World">
<meta property="og:description" content="code world,not cold">
<meta property="og:locale" content="zh_CN">
<meta property="og:image" content="http://example.com/img/SusiePreview.jpg">
<meta property="article:author" content="独揽清风">
<meta name="twitter:card" content="summary">
<meta name="twitter:image" content="http://example.com/img/SusiePreview.jpg"><link rel="shortcut icon" href="/img/favicon.png"><link rel="canonical" href="http://example.com/"><link rel="preconnect" href="//cdn.jsdelivr.net"/><link rel="preconnect" href="//busuanzi.ibruce.info"/><link rel="stylesheet" href="/css/index.css"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free/css/all.min.css" media="print" onload="this.media='all'"><script>var GLOBAL_CONFIG = {
root: '/',
algolia: undefined,
localSearch: undefined,
translate: undefined,
noticeOutdate: undefined,
highlight: {"plugin":"highlighjs","highlightCopy":true,"highlightLang":true},
copy: {
success: '复制成功',
error: '复制错误',
noSupport: '浏览器不支持'
},
relativeDate: {
homepage: false,
post: false
},
runtime: '',
date_suffix: {
just: '刚刚',
min: '分钟前',
hour: '小时前',
day: '天前',
month: '个月前'
},
copyright: undefined,
lightbox: 'fancybox',
Snackbar: undefined,
source: {
jQuery: 'https://cdn.jsdelivr.net/npm/jquery@latest/dist/jquery.min.js',
justifiedGallery: {
js: 'https://cdn.jsdelivr.net/npm/justifiedGallery/dist/js/jquery.justifiedGallery.min.js',
css: 'https://cdn.jsdelivr.net/npm/justifiedGallery/dist/css/justifiedGallery.min.css'
},
fancybox: {
js: 'https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.js',
css: 'https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.css'
}
},
isPhotoFigcaption: false,
islazyload: false,
isanchor: false
};
var saveToLocal = {
set: function setWithExpiry(key, value, ttl) {
const now = new Date()
const expiryDay = ttl * 86400000
const item = {
value: value,
expiry: now.getTime() + expiryDay,
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localStorage.setItem(key, JSON.stringify(item))
},
get: function getWithExpiry(key) {
const itemStr = localStorage.getItem(key)
if (!itemStr) {
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const item = JSON.parse(itemStr)
const now = new Date()
if (now.getTime() > item.expiry) {
localStorage.removeItem(key)
return undefined
}
return item.value
}
}
// https://stackoverflow.com/questions/16839698/jquery-getscript-alternative-in-native-javascript
const getScript = url => new Promise((resolve, reject) => {
const script = document.createElement('script')
script.src = url
script.async = true
script.onerror = reject
script.onload = script.onreadystatechange = function() {
const loadState = this.readyState
if (loadState && loadState !== 'loaded' && loadState !== 'complete') return
script.onload = script.onreadystatechange = null
resolve()
}
document.head.appendChild(script)
})</script><script id="config_change">var GLOBAL_CONFIG_SITE = {
isPost: false,
isHome: true,
isHighlightShrink: false,
isToc: false,
postUpdate: '2022-03-18 16:50:40'
}</script><noscript><style type="text/css">
#nav {
opacity: 1
}
.justified-gallery img {
opacity: 1
}
#recent-posts time,
#post-meta time {
display: inline !important
}
</style></noscript><script>(function () { window.activateDarkMode = function () {
document.documentElement.setAttribute('data-theme', 'dark')
if (document.querySelector('meta[name="theme-color"]') !== null) {
document.querySelector('meta[name="theme-color"]').setAttribute('content', '#0d0d0d')
}
}
window.activateLightMode = function () {
document.documentElement.setAttribute('data-theme', 'light')
if (document.querySelector('meta[name="theme-color"]') !== null) {
document.querySelector('meta[name="theme-color"]').setAttribute('content', '#ffffff')
}
}
const autoChangeMode = 'false'
const t = saveToLocal.get('theme')
if (autoChangeMode === '1') {
const isDarkMode = window.matchMedia('(prefers-color-scheme: dark)').matches
const isLightMode = window.matchMedia('(prefers-color-scheme: light)').matches
const isNotSpecified = window.matchMedia('(prefers-color-scheme: no-preference)').matches
const hasNoSupport = !isDarkMode && !isLightMode && !isNotSpecified
if (t === undefined) {
if (isLightMode) activateLightMode()
else if (isDarkMode) activateDarkMode()
else if (isNotSpecified || hasNoSupport) {
const now = new Date()
const hour = now.getHours()
const isNight = hour <= 6 || hour >= 18
isNight ? activateDarkMode() : activateLightMode()
}
window.matchMedia('(prefers-color-scheme: dark)').addListener(function (e) {
if (saveToLocal.get('theme') === undefined) {
e.matches ? activateDarkMode() : activateLightMode()
}
})
} else if (t === 'light') activateLightMode()
else activateDarkMode()
} else if (autoChangeMode === '2') {
const now = new Date()
const hour = now.getHours()
const isNight = hour <= 6 || hour >= 18
if (t === undefined) isNight ? activateDarkMode() : activateLightMode()
else if (t === 'light') activateLightMode()
else activateDarkMode()
} else {
if (t === 'dark') activateDarkMode()
else if (t === 'light') activateLightMode()
}const asideStatus = saveToLocal.get('aside-status')
if (asideStatus !== undefined) {
if (asideStatus === 'hide') {
document.documentElement.classList.add('hide-aside')
} else {
document.documentElement.classList.remove('hide-aside')
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}})()</script><meta name="generator" content="Hexo 5.3.0"></head><body><div id="web_bg"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="author-avatar"><img class="avatar-img" src="/img/SusiePreview.jpg" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/archives/"><div class="headline">文章</div><div class="length-num">7</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/tags/"><div class="headline">标签</div><div class="length-num">3</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/categories/"><div class="headline">分类</div><div class="length-num">5</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fa fa-heartbeat"></i><span> 清单</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li><li><a class="site-page" href="/Gallery/"><i class="fa-fw fas fa-images"></i><span> 照片</span></a></li><li><a class="site-page" href="/movies/"><i class="fa-fw fas fa-video"></i><span> 电影</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div></div></div><div id="body-wrap"><header class="full_page" id="page-header" style="background-image: url(/img/SusiePreview.jpg)"><nav id="nav"><span id="blog_name"><a id="site-name" href="/">Code World</a></span><div id="menus"><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="javascript:void(0);"><i class="fa-fw fa fa-heartbeat"></i><span> 清单</span><i class="fas fa-chevron-down expand"></i></a><ul class="menus_item_child"><li><a class="site-page" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li><li><a class="site-page" href="/Gallery/"><i class="fa-fw fas fa-images"></i><span> 照片</span></a></li><li><a class="site-page" href="/movies/"><i class="fa-fw fas fa-video"></i><span> 电影</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="site-info"><h1 id="site-title">Code World</h1><div id="site-subtitle"><span id="subtitle"></span></div><div id="site_social_icons"><a class="social-icon" href="https://github.com/Yao-Hongyu" target="_blank" title="Github"><i class="fab fa-github"></i></a></div></div><div id="scroll-down"><i class="fas fa-angle-down scroll-down-effects"></i></div></header><main class="layout" id="content-inner"><div class="recent-posts" id="recent-posts"><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2021/07/20/Redis/" title="Redis"> <img class="post_bg" src="/img/blogTopImg/Redis.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Redis"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/07/20/Redis/" title="Redis">Redis</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2021-07-19T16:00:00.000Z" title="发表于 2021-07-20 00:00:00">2021-07-20</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/NOSQL/">NOSQL</a></span></div><div class="content">Redis1.NOSQL数据库简介1.1 技术发展技术的分类
1、解决功能性的问题：Java、Jsp、RDBMS、Tomcat、HTML、Linux、JDBC、SVN
2、解决扩展性的问题：Struts、Spring、SpringMVC、Hibernate、Mybatis
3、解决性能的问题：NoSQL、Java线程、Hadoop、Nginx、MQ、ElasticSearch
1.1.1 Web1.0时代 Web1.0的时代，数据访问量很有限，用一夫当关的高性能的单点服务器可以解决大部分问题。
1.1.2 Web2.0时代 随着Web2.0的时代的到来，用户访问量大幅度提升，同时产生了大量的用户数据。加上后来的智能移动设备的普及，所有的互联网平台都面临了巨大的性能挑战。
1.1.3 解决CPU及内存压力
1.1.4 解决IO压力
1.2 NoSQL数据库1.2.1 NoSQL数据库概述 NoSQL(NoSQL = Not Only SQL )，意即“不仅仅是SQL”，泛指非关系型的数据库。
NoSQL 不依赖业务逻辑方式存储，而以简单的key-v ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2021/07/16/RabbitMQ/" title="RabbitMQ"> <img class="post_bg" src="/img/blogTopImg/RabbitMQ.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="RabbitMQ"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/07/16/RabbitMQ/" title="RabbitMQ">RabbitMQ</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2021-07-15T16:00:00.000Z" title="发表于 2021-07-16 00:00:00">2021-07-16</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/MessageQueue/">MessageQueue</a></span></div><div class="content">RabbitMQ1. MQ1.1 什么是MQ MQ(message queque)，即消息队列，本质上是个队列，是一种跨进程的通信机制，用于上下游传递信息。在互联网架构中，MQ是一种非常常见的上下游“逻辑解耦+物理解耦”的信息通信服务。使用了MQ之后，信息发送上游只需要依赖MQ，不用依赖其他服务
1.2 为什么需要MQ1. 流量消峰 使用消息队列做缓冲，可以有效应对流量顶峰，把集中的订单分散成一段时间来处理，优于全部不能处理。
2. 应用解耦 采用基于消息队列的方式，可以减少系统间相互调用的问题。如某一系统出现故障，可以把需要处理的内容缓存在消息队列中，待系统恢复后继续处理，提升系统的可用性。
3. 异步处理 一些服务间调用是异步的，需要花很长的时间执行。如果使用消息总线，可以很方便的解决这个问题。比如，当A调用B的服务后，只需要监听B处理完成的信息，当B处理完成后，会发送消息给MQ，MQ会把消息转发给A服务，这样的话A服务无需循环调用B服务，还能及时得到异步处理成功的信息
1.3 MQ的分类
ActiveMQ –最早的MQ
优点：单机吞吐量万级，时 ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2021/02/15/Java%20JWT/" title="Java JWT"> <img class="post_bg" src="/img/blogTopImg/JWT.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java JWT"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/02/15/Java%20JWT/" title="Java JWT">Java JWT</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2021-02-15T14:28:00.000Z" title="发表于 2021-02-15 22:28:00">2021-02-15</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Java/">Java</a></span></div><div class="content">Java JWTJava版本的对于JSON Web Token(即 JWT )的实现
安装导入依赖Maven12345<dependency> <groupId>com.auth0</groupId> <artifactId>java-jwt</artifactId> <version>3.13.0</version></dependency>
Gradle1implementation 'com.auth0:java-jwt:3.13.0'
支持的算法
JWS
Algorithm
Description
HS256
HMAC256
HMAC with SHA-256
HS384
HMAC384
HMAC with SHA-384
HS512
HMAC512
HMAC with SHA-512
RS256
RAS256
RSASSA-PKCS1-v1_5 with SHA-256
RS384
RAS384
RSASSA-PKCS ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2021/02/04/Java%E6%9C%80%E5%85%A8%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93/" title="Java"> <img class="post_bg" src="/img/blogTopImg/Java.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/02/04/Java%E6%9C%80%E5%85%A8%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93/" title="Java">Java</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2021-02-03T16:36:00.000Z" title="发表于 2021-02-04 00:36:00">2021-02-04</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Java/">Java</a></span></div><div class="content">Java语言发展史Java语言 语言：人与人交流沟通的表达方式
计算机语言：人与计算机之间进行信息交流沟通的一种特殊语言
Java是美国公司Sun（Stanford University Network）与1995年推出的计算机语言
Java之父： 詹姆斯高斯林
Java跨平台原理 平台：操作系统（如Windows，Macos，Linux）
Java程序可以在任何操作系统上运行
原理：JVM（各平台有对应版本JVM（即Java Virtual Machine–Java虚拟机），保证程序的正常运行
JRE与JDK JRE（Java Runtime Environment）：Java程序运行时的环境，包含JVM和运行时所需的核心类库
JDK（Java Development Kit)：Java程序开发工具（编译工具javac.exe+运行工具java.exe）包，包含JRE和开发人员使用的工具 ==开发Java程序必备==
...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2021/02/04/MYSQL/" title="MySQL"> <img class="post_bg" src="/img/blogTopImg/MySQL.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="MySQL"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/02/04/MYSQL/" title="MySQL">MySQL</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2021-02-03T16:36:00.000Z" title="发表于 2021-02-04 00:36:00">2021-02-04</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Database/">Database</a></span></div><div class="content">启动数据库服务以管理员身份运行Windows PowerShell
输入开启服务指令
1net start MySQL5.7(数据库服务器名称)
关闭服务指令
1net stop MySQL5.7(数据库服务器名称)
使用数据库服务登录数据库1mysql -uroot -p
然后键入密码
创建一个数据库1DATABASE CREATE t1;
如数据库已存在，会直接报ERROR
创建一个数据库（带检查）1DATABASE CREATE IF NOT EXISTS t1;
如数据库已存在，会报WARNING
查看WARRINGS1SHOW WARNINGS;
显示可用的数据库列表1SHOW TABLES
选择数据库1USE XXX（数据库名）
返回当前选择的数据库内可用表的列表1SHOW COLUMNS FROM XXX（表名）;
一种MySQL可以使用的快捷方式
1DESCRIBE XXX（表名）;
显示广泛的服务器状态信息1SHOW STATUS;
分别用来显示创建特定数据库或表的MySQL语句1SHOW CREATE DATABASE; & SHOW CREATE TABL ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2021/02/03/%E6%95%B0%E6%8D%AE%E5%BA%93/" title="数据库"> <img class="post_bg" src="/img/blogTopImg/database.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="数据库"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/02/03/%E6%95%B0%E6%8D%AE%E5%BA%93/" title="数据库">数据库</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2021-02-03T13:42:00.000Z" title="发表于 2021-02-03 21:42:00">2021-02-03</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Database/">Database</a></span></div><div class="content">数据库什么是数据库？数据库是一个容器，里面保存着有组织的数据
数据库指的是数据库，而不是数据库软件，即数据库管理系统（DMBS），DBMS帮我们访问数据库，建立我们和数据库之间的联系
数据库里都有什么？数据库就像一个抽屉，不能随便把东西塞进去，而要把东西分开，有序的塞进去，==表==就像抽屉中的一个信封，把数据分开储存。
表，是某种特定类型数据的结构化清单，数据库中的每个表都有一个唯一的名字，数据库中不允许存在具有相同名字的表
表里有什么？表由列组成，列是表中的一个字段，存储着表中某部分的信息
假如把表比作森林，列就是森林中的一棵棵树，正是树组成了森林。树有很多种，列自然也如此
一个好的表，应该分好列，因为每个列都有相应的数据类型，所以应该用恰当的列存储恰当的数据
行是什么？表中的数据按行存储，保存的每个记录存储在自己的行内，就像人皆为人，却有不同的特点
每个表都有一个主键表中每一行都应该有唯一标识自己的一列，该列的值可以唯一区分表中的每个行，这列就是主键，比如ID card
无论如何挑选主键，都必须满足以下几点
任意两行都不具有相同的主键值
每个行都必须具有一个主键值（主键值不允许 ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2020/12/26/DOS/" title="常用DOS命令"> <img class="post_bg" src="/img/blogTopImg/Dos.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="常用DOS命令"></a></div><div class="recent-post-info"><a class="article-title" href="/2020/12/26/DOS/" title="常用DOS命令">常用DOS命令</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2020-12-26T08:40:00.000Z" title="发表于 2020-12-26 16:40:00">2020-12-26</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Dos/">Dos</a></span></div><div class="content">1.如何使用DOS命令1.1 打开命令提示符窗口 （win+R） 1.按下 win+R
2.输入cmd
3.按下回车键（即enter）
2常用的DOS命令1.盘符切换 输入任意盘号+冒号，按下回车键
如( e：)
2.查看路径下内容 输入 dir ，按下回车键
3.进入单级目录 输入 cd + 空格 + 要进入的目录
如( cd users )
4.回退至上一级目录 输入 cd.. 按下回车键
5.进入多级目录（==多次进入单级目录） 输入 cd + 目录1\ + 目录2\ + ...\ (直到目标目录),按下回车键
如( cd users\Lenovo\Desktop\... )
6.回退到盘符目录 输入 cd\
7.清屏 输入 cls ,按下回车键
8.退出命令提示符窗口 输入 exit ，按下回车键
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