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target="_blank" title="Email"><i class="fas fa-envelope"></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"><a href="/2023/02/26/%E6%95%B0%E6%8D%AE%E5%BA%93%E5%AD%A6%E4%B9%A0%E4%B9%8B%E4%BA%8B%E5%8A%A1%E6%93%8D%E4%BD%9C/" title="数据库学习之事务操作"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p12.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="数据库学习之事务操作"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/02/26/%E6%95%B0%E6%8D%AE%E5%BA%93%E5%AD%A6%E4%B9%A0%E4%B9%8B%E4%BA%8B%E5%8A%A1%E6%93%8D%E4%BD%9C/" title="数据库学习之事务操作">数据库学习之事务操作</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 class="post-meta-date-created" datetime="2023-02-26T15:38:00.000Z" title="发表于 2023-02-26 23:38:00">2023-02-26</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-02-26T16:07:22.603Z" title="更新于 2023-02-27 00:07:22">2023-02-27</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E6%95%B0%E6%8D%AE%E5%BA%93/">数据库</a></span></div><div class="content">数据库学习之事务操作引入我们在买票的时候，两人同时买票，如果不加以处理，那么两个人可能会买到同一张票
CURD满足什么属性，能解决上述问题？
买票的过程得是原子的吧
买票互相应该不能影响吧
买完票应该要永久有效吧
买前，和买后都要是确定的状态吧
一堆相关操作的集合就是一个事务一个事务可以包含很多条mysql语句所有的sql操作，一般都会被mysql包装成为事务，以事务的方式提交的！
原子性：一个事务里面的多个语句，要么全部执行完成，要么不执行如果只执行了其中一些，那么就会回滚到之前的状态一致性：在事务开始之前和事务结束以后，数据库的完整性没有被破坏。隔离性：数据库允许多个并发事务同时对其数据进行读写和修改的能力，隔离性可以防止多个事务并发执行时由于交叉执行而导致数据的不一致。事务隔离分为不同级别，包括读未提交（ Read uncommitted ）、读提交（ read committed ）、可重复读（ repeatable read ）和串行化（ Serializable ）持久性： 事务处理结束后，对数据的修改就是永久的，即便系统故障也不会丢失。
为什么会出现事务应用程 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2023/02/26/java%E5%90%8C%E6%97%B6%E8%AE%BF%E9%97%AE%E4%B8%80%E4%B8%AAmeshod%E4%BC%9A%E8%B5%B7%E5%87%A0%E4%B8%AA%E7%BA%BF%E7%A8%8B/" title="java同时访问一个meshod会起几个线程"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p13.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java同时访问一个meshod会起几个线程"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/02/26/java%E5%90%8C%E6%97%B6%E8%AE%BF%E9%97%AE%E4%B8%80%E4%B8%AAmeshod%E4%BC%9A%E8%B5%B7%E5%87%A0%E4%B8%AA%E7%BA%BF%E7%A8%8B/" title="java同时访问一个meshod会起几个线程">java同时访问一个meshod会起几个线程</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 class="post-meta-date-created" datetime="2023-02-26T15:35:42.000Z" title="发表于 2023-02-26 23:35:42">2023-02-26</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-02-26T15:36:33.915Z" title="更新于 2023-02-26 23:36:33">2023-02-26</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/java/">java</a></span></div><div class="content">java同时访问一个meshod会起几个线程首先看文章之前你可以在脑海中模拟一下，两个请求并发访问一个方法，从浏览器到后台的大致流程是怎么样的，模拟的越详细越好。
我相信很大一部分人可能都会被这个问题难住，不管是刚毕业的大学生，还是工作两三年的朋友们。
可能我们平时太多的关注业务逻辑，关注各种炫酷的框架，亦或者是公司太忙，忙到我们没时间成长等等等，从而忽略了这些最基础的东西。不过可能正是因为这些最基础的东西，才是我们为什么薪资比别人低了一点，为什么机会比别人少了一点，为什么差距和别人越来越大。
学而不思则罔，思而不学则殆。
这个问题其实分两步第一步是用户点击页面，并发送请求到服务器的步骤，这个步骤很复杂，涉及到网络协议很多东西，我们暂且不讲。第二步就是服务器收到请求，我们代码执行的过程，我们具体说一下这一步。如下图这个简单的方法
有两个请求并发访问，也就是说有两个线程同时准备进入方法printA()。那么问题来了
是线程1先进入方法执行完毕后再让线程2进入执行吗。
不是的，是两个线程同时去执行这一段代码
那有同学可能会问了，如果两个线程同时进入这个方法，
线程1执行到a = a + ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2023/02/26/Go%E8%AF%AD%E8%A8%80%E7%9A%84%E7%B1%BB-%E7%BB%93%E6%9E%84%E4%BD%93%E5%92%8C%E6%96%B9%E6%B3%95/" title="Go语言的类_结构体和方法"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p14.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Go语言的类_结构体和方法"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/02/26/Go%E8%AF%AD%E8%A8%80%E7%9A%84%E7%B1%BB-%E7%BB%93%E6%9E%84%E4%BD%93%E5%92%8C%E6%96%B9%E6%B3%95/" title="Go语言的类_结构体和方法">Go语言的类_结构体和方法</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 class="post-meta-date-created" datetime="2023-02-26T15:04:13.000Z" title="发表于 2023-02-26 23:04:13">2023-02-26</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-02-26T15:16:13.634Z" title="更新于 2023-02-26 23:16:13">2023-02-26</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/GoLand/">GoLand</a></span></div><div class="content">Go语言的类_结构体和方法前言GO语言中没有类的概念，也不支持类的继承等面向对象的概念。GO语言中通过结构体的内嵌再配合接口比面向对象具有更高的扩展性和灵活性。
一、结构体的基础知识1. 结构体的定义GO语言中的基础数据类型可以表示一些事物的基本属性，但是当我们想表达一个事物的部分或者全部属性时，单一的基本数据类型明显就不满足需求了。GO语言中提供了一种自定义的数据类型，可以封装多个基本数据类型，这种数据类型就是结构体（struct）。
GO语言中通过type和struct关键字来定义结构体，例：
12345type person struct{ name string age int sex string}
2. 结构体实例化GO语言中只有当结构体实例化时才会分配内存，因此必须实例化后才能使用结构体字段。例：
1234567891011121314151617181920//var 结构体实例 结构体类型type person struct{ name string age int sex string}func main () ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2023/02/06/nginx%E8%AF%A6%E8%A7%A3-md/" title="nginx详解.md"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p14.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="nginx详解.md"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/02/06/nginx%E8%AF%A6%E8%A7%A3-md/" title="nginx详解.md">nginx详解.md</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 class="post-meta-date-created" datetime="2023-02-06T06:12:58.000Z" title="发表于 2023-02-06 14:12:58">2023-02-06</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-02-06T08:58:21.214Z" title="更新于 2023-02-06 16:58:21">2023-02-06</time></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/Nginx/">Nginx</a></span></div><div class="content">Nginx详解
引言
一、性能怪兽-Nginx概念深入浅出
二、Nginx环境搭建
三、Nginx反向代理-负载均衡
四、Nginx动静分离
五、Nginx资源压缩
六、Nginx缓冲区
七、Nginx缓存机制
八、Nginx实现IP黑白名单
九、Nginx跨域配置
十、Nginx防盗链设计
十一、Nginx大文件传输配置
十二、Nginx配置SLL证书
十三、Nginx的高可用
十四、Nginx性能优化
十五、放在最后的结尾
引言早期的业务都是基于单体节点部署，由于前期访问流量不大，因此单体结构也可满足需求，但随着业务增长，流量也越来越大，那么最终单台服务器受到的访问压力也会逐步增高。时间一长，单台服务器性能无法跟上业务增长，就会造成线上频繁宕机的现象发生，最终导致系统瘫痪无法继续处理用户的请求。
“
从上面的描述中，主要存在两个问题：①单体结构的部署方式无法承载日益增长的业务流量。②当后端节点宕机后，整个系统会陷入瘫痪，导致整个项目不可用。
因此在这种背景下，引入负载均衡技术可带来的收益：
「系统的高可用：」 当某个节点宕机后可以迅速将流量转移至其他节点。
「系统的高性能： ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2023/01/15/HTTP%E8%AF%A6%E8%A7%A3-md/" title="HTTP详解.md"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p12.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="HTTP详解.md"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/01/15/HTTP%E8%AF%A6%E8%A7%A3-md/" title="HTTP详解.md">HTTP详解.md</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 class="post-meta-date-created" datetime="2023-01-15T12:20:17.000Z" title="发表于 2023-01-15 20:20:17">2023-01-15</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-01-15T12:45:05.066Z" title="更新于 2023-01-15 20:45:05">2023-01-15</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/HTTP/">HTTP</a></span></div><div class="content">一. 什么是HTTP协议：
超文本传输协议（HTTP，HyperText Transfer Protocol)是互联网上应用最为广泛的一种网络协议。所有的WWW文件都必须遵守这个标准。设计HTTP最初的目的是为了提供一种发布和接收HTML页面的方法。
HTTP属于OSI网络七层协议模型中的”最上层”:应用层协议。由请求和响应构成，是一个标准的客户端服务器模型。HTTP是一个无状态的协议 ( HTTP无状态协议，是指协议对于事务处理没有记忆能力。缺少状态意味着如果后续处理需要前面的信息，则它必须重传，这样可能导致每次连接传送的数据量增大。另一方面，在服务器不需要先前信息时它的应答就较快 ) 。
HTTP默认端口号为80。它也可以承载在TLS和SSL之上，通过加密、认证的方式实现数据传输的安全，称为HTTPS，HTTPS默认端口号为443。
早期HTTP用于传输网页HTML文件，发展到现在，应用变得广泛，客户端软件（PC，Android,iOS等）大部分通过HTTP传输数据。
二.从浏览器输入地址到呈现页面中间发生了什么事情(通信过程)2.1 简单来说
浏览器（客户端）进行地址解析。 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2023/01/01/SpringBoot%E5%B8%B8%E7%94%A8%E6%B3%A8%E8%A7%A3/" title="SpringBoot常用注解"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p13.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringBoot常用注解"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/01/01/SpringBoot%E5%B8%B8%E7%94%A8%E6%B3%A8%E8%A7%A3/" title="SpringBoot常用注解">SpringBoot常用注解</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 class="post-meta-date-created" datetime="2023-01-01T10:31:31.000Z" title="发表于 2023-01-01 18:31:31">2023-01-01</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-01-04T01:50:57.525Z" title="更新于 2023-01-04 09:50:57">2023-01-04</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/java/">java</a></span></div><div class="content">SoringBoot常用注解@RequestMapping
@RequestMapping注解的主要用途是将Web请求与请求处理类中的方法进行映射。Spring MVC和Spring WebFlux都通过RquestMappingHandlerMapping和RequestMappingHndlerAdapter两个类来提供对@RequestMapping注解的支持。
@RequestMapping注解对请求处理类中的请求处理方法进行标注；@RequestMapping注解拥有以下的六个配置属性：
value:映射的请求URL或者其别名
method:兼容HTTP的方法名
params:根据HTTP参数的存在、缺省或值对请求进行过滤
header:根据HTTP Header的存在、缺省或值对请求进行过滤
consume:设定在HTTP请求正文中允许使用的媒体类型
product:在HTTP响应体中允许使用的媒体类型
提示：在使用@RequestMapping之前，请求处理类还需要使用@Controller或@RestController进行标记
下面是使用@RequestMappi ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2022/12/25/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" title="设计模式"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p10.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="设计模式"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/12/25/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" title="设计模式">设计模式</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 class="post-meta-date-created" datetime="2022-12-25T05:10:34.000Z" title="发表于 2022-12-25 13:10:34">2022-12-25</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-12-25T05:31:59.721Z" title="更新于 2022-12-25 13:31:59">2022-12-25</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/java/">java</a></span></div><div class="content">设计模式单例模式单例模式是指一个类在一个进程中只有一个实例对象（但也不一定，比如Spring中的Bean的单例是指在一个容器中是单例的）
单例模式创建分为饿汉式和懒汉式，总共大概有8种写法。但是在开源项目中使用最多的主要有两种写法：
1、静态常量静态常量方式属于饿汉式，以静态变量的方式声明对象。这种单例模式在Spring中使用的比较多，举个例子，在Spring中对于Bean的名称生成有个类AnnotationBeanNameGenerator就是单例的。
AnnotationBeanNameGenerator
2、双重检查机制除了上面一种，还有一种双重检查机制在开源项目中也使用的比较多，而且在面试中也比较喜欢问。双重检查机制方式属于懒汉式，代码如下：
12345678910111213141516171819public class Singleton { private volatile static Singleton INSTANCE; private Singleton() { } public static Singlet ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2022/12/25/Localhost%E8%AF%A6%E8%A7%A3/" title="Localhost详解"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p13.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Localhost详解"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/12/25/Localhost%E8%AF%A6%E8%A7%A3/" title="Localhost详解">Localhost详解</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 class="post-meta-date-created" datetime="2022-12-25T05:00:30.000Z" title="发表于 2022-12-25 13:00:30">2022-12-25</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-12-25T05:01:58.067Z" title="更新于 2022-12-25 13:01:58">2022-12-25</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BD%91%E7%BB%9C/">计算机网络</a></span></div><div class="content">Localhost & 127.0.0.1你女神爱不爱你，你问她，她可能不会告诉你。
但网通不通，你 ping 一下就知道了。
可能看到标题，你就知道答案了，但是你了解背后的原因吗？
那如果把 127.0.0.1 换成 0.0.0.0 或 localhost 会怎么样呢？你知道这几个IP有什么区别吗？
以前面试的时候就遇到过这个问题，大家看个动图了解下面试官和我当时的场景，求当时我的心里阴影面积。
话不多说，我们直接开车。
拔掉网线，断网。
然后在控制台输入ping 127.0.0.1。
1234567891011$ ping 127.0.0.1PING 127.0.0.1 (127.0.0.1): 56 data bytes64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.080 ms64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.093 ms64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.074 ms64 bytes ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2022/12/25/ThreadLocal%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" title="ThreadLocal内存泄漏"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p15.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="ThreadLocal内存泄漏"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/12/25/ThreadLocal%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" title="ThreadLocal内存泄漏">ThreadLocal内存泄漏</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 class="post-meta-date-created" datetime="2022-12-25T04:58:55.000Z" title="发表于 2022-12-25 12:58:55">2022-12-25</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-12-25T04:59:23.670Z" title="更新于 2022-12-25 12:59:23">2022-12-25</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/java/">java</a></span></div><div class="content">ThreadLocaln内存泄漏ThreadLocal是什么ThreadLocal是一个本地线程副本变量工具类。主要用于将私有线程和该线程存放的副本对象做一个映射，各个线程之间的变量互不干扰，在高并发场景下，可以实现无状态的调用，特别适用于各个线程依赖不通的变量值完成操作的场景。
下图为ThreadLocal的内部结构图
从上面的结构图，我们已经窥见ThreadLocal的核心机制：
每个Thread线程内部都有一个Map。
Map里面存储线程本地对象（key）和线程的变量副本（value）
但是，Thread内部的Map是由ThreadLocal维护的，由ThreadLocal负责向map获取和设置线程的变量值。
所以对于不同的线程，每次获取副本值时，别的线程并不能获取到当前线程的副本值，形成了副本的隔离，互不干扰。
ThreadLocalMapThreadLocalMap是ThreadLocal的内部类，没有实现Map接口，用独立的方式实现了Map的功能，其内部的Entry也独立实现。
和HashMap的最大的不同在于，ThreadLocalMap结构非常简单，没有next ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2022/12/24/ThreadLocal/" title="ThreadLocal"><img class="post_bg" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p14.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="ThreadLocal"></a></div><div class="recent-post-info"><a class="article-title" href="/2022/12/24/ThreadLocal/" title="ThreadLocal">ThreadLocal</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 class="post-meta-date-created" datetime="2022-12-24T15:25:35.000Z" title="发表于 2022-12-24 23:25:35">2022-12-24</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-12-25T04:25:18.014Z" title="更新于 2022-12-25 12:25:18">2022-12-25</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%8A%80%E6%9C%AF/">计算机技术</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/java/">java</a></span></div><div class="content">
ThreadLocal的作用以及应用场景
使用场景
原理分析
ThreadLocalMap的底层结构
内存泄露产生的原因
解决Hash冲突
使用ThreadLocal时对象存在哪里？
ThreadLocal的作用以及应用场景ThreadLocal算是一种并发容器吧，因为他的内部是有ThreadLocalMap组成，ThreadLocal是为了解决多线程情况下变量不能被共享的问题，也就是多线程共享变量的问题。
ThreadLocal和Lock以及Synchronized的区别是：ThreadLocal是给每个线程分配一个变量（对象），各个线程都存有变量的副本，这样每个线程都是使用自己（变量）对象实例，使线程与线程之间进行隔离；而Lock和Synchronized的方式是使线程有顺序的执行。
举一个简单的例子：目前有100个学生等待签字，但是老师只有一个笔，那老师只能按顺序的分给每个学生，等待A学生签字完成然后将笔交给B学生，这就类似Lock，Synchronized的方式。而ThreadLocal是，老师直接拿出一百个笔给每个学生；再效率提高的同事也要付出一个内存消耗；也就是以空 ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="/img/p8.webp" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">佚名</div><div class="author-info__description"></div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">10</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">6</div></a><a href="/categories/"><div class="headline">分类</div><div 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function butterfly_clock_anzhiyu_injector_config(){
var parent_div_git = document.getElementsByClassName('sticky_layout')[0];
var item_html = '<div class="card-widget card-clock"><div class="card-glass"><div class="card-background"><div class="card-content"><div id="hexo_electric_clock"><img class="entered loading" id="card-clock-loading" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://cdn.cbd.int/hexo-butterfly-clock-anzhiyu/lib/loading.gif" style="height: 120px; width: 100%;" data-ll-status="loading"/></div></div></div></div></div>';
console.log('已挂载butterfly_clock_anzhiyu')
if(parent_div_git) {
parent_div_git.insertAdjacentHTML("afterbegin",item_html)
}
}
var elist = 'null'.split(',');
var cpage = location.pathname;
var epage = '/';
var qweather_key = 'b16a1fa0e63c46a4b8f28abfb06ae3fe';
var gaud_map_key = 'e2b04289e870b005374ee030148d64fd&s=rsv3';
var baidu_ak_key = 'undefined';
var flag = 0;
var clock_rectangle = '113.34532,23.15624';
var clock_default_rectangle_enable = 'false';
for (var i=0;i<elist.length;i++){
if (cpage.includes(elist[i])){
flag++;
}
}
if ((epage ==='all')&&(flag == 0)){
butterfly_clock_anzhiyu_injector_config();
}
else if (epage === cpage){
butterfly_clock_anzhiyu_injector_config();
}
</script><script src="https://widget.qweather.net/simple/static/js/he-simple-common.js?v=2.0"></script><script data-pjax src="https://cdn.cbd.int/hexo-butterfly-clock-anzhiyu/lib/clock.min.js"></script><div class="js-pjax"><script async="async">var arr = document.getElementsByClassName('recent-post-item');
for(var i = 0;i<arr.length;i++){
arr[i].classList.add('wow');
arr[i].classList.add('animate__zoomIn');
arr[i].setAttribute('data-wow-duration', '2s');
arr[i].setAttribute('data-wow-delay', '1s');
arr[i].setAttribute('data-wow-offset', '100');
arr[i].setAttribute('data-wow-iteration', '2');
}</script><script async="async">var arr = document.getElementsByClassName('card-widget');
for(var i = 0;i<arr.length;i++){
arr[i].classList.add('wow');
arr[i].classList.add('animate__zoomIn');
arr[i].setAttribute('data-wow-duration', '');
arr[i].setAttribute('data-wow-delay', '');
arr[i].setAttribute('data-wow-offset', '');
arr[i].setAttribute('data-wow-iteration', '');
}</script></div><script defer src="https://npm.elemecdn.com/hexo-butterfly-wowjs/lib/wow.min.js"></script><script defer src="https://npm.elemecdn.com/hexo-butterfly-wowjs/lib/wow_init.js"></script><script data-pjax>
function butterfly_footer_beautify_injector_config(){
var parent_div_git = document.getElementById('footer-wrap');
var item_html = '<div id="workboard"></div><p id="ghbdages"><a class="github-badge" target="_blank" href="https://hexo.io/" style="margin-inline:5px" data-title="博客框架为Hexo_v6.2.0" title=""><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://img.shields.io/badge/Frame-Hexo-blue?style=flat&logo=hexo" alt=""/></a><a class="github-badge" target="_blank" href="https://butterfly.js.org/" style="margin-inline:5px" data-title="主题版本Butterfly_v4.3.1" title=""><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://img.shields.io/badge/Theme-Butterfly-6513df?style=flat&logo=bitdefender" alt=""/></a><a class="github-badge" target="_blank" href="https://vercel.com/" style="margin-inline:5px" data-title="本站采用多线部署，主线路托管于Vercel" title=""><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://img.shields.io/badge/Hosted-Vercel-brightgreen?style=flat&logo=Vercel" alt=""/></a><a class="github-badge" target="_blank" href="https://dashboard.4everland.org/" style="margin-inline:5px" data-title="本站采用多线部署，备用线路托管于4EVERLAND" title=""><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://img.shields.io/badge/Hosted-4EVERLAND-22DDDD?style=flat&logo=IPFS" alt=""/></a><a class="github-badge" target="_blank" href="https://github.com/" style="margin-inline:5px" data-title="本站项目由Github托管" title=""><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://img.shields.io/badge/Source-Github-d021d6?style=flat&logo=GitHub" alt=""/></a><a class="github-badge" target="_blank" href="http://creativecommons.org/licenses/by-nc-sa/4.0/" style="margin-inline:5px" data-title="本站采用知识共享署名-非商业性使用-相同方式共享4.0国际许可协议进行许可" title=""><img src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-lazy-src="https://img.shields.io/badge/Copyright-BY--NC--SA%204.0-d42328?style=flat&logo=Claris" alt=""/></a></p>';
console.log('已挂载butterfly_footer_beautify')
parent_div_git.insertAdjacentHTML("beforeend",item_html)
}
var elist = 'null'.split(',');
var cpage = location.pathname;
var epage = 'all';
var flag = 0;
for (var i=0;i<elist.length;i++){
if (cpage.includes(elist[i])){
flag++;
}
}
if ((epage ==='all')&&(flag == 0)){
butterfly_footer_beautify_injector_config();
}
else if (epage === cpage){
butterfly_footer_beautify_injector_config();
}
</script><script async src="https://npm.elemecdn.com/[email protected]/lib/runtime.js"></script><script data-pjax src="https://npm.elemecdn.com/hexo-filter-gitcalendar/lib/gitcalendar.js"></script><script data-pjax>
function gitcalendar_injector_config(){
var parent_div_git = document.getElementById('recent-posts');
var item_html = '<div class="recent-post-item" style="width:100%;height:auto;padding:10px;"><style>#git_container{min-height: 280px}@media screen and (max-width:650px) {#git_container{min-height: 0px}}</style><div id="git_loading" style="width:10%;height:100%;margin:0 auto;display: block;"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 50 50" style="enable-background:new 0 0 50 50" xml:space="preserve"><path fill="#d0d0d0" d="M25.251,6.461c-10.318,0-18.683,8.365-18.683,18.683h4.068c0-8.071,6.543-14.615,14.615-14.615V6.461z" transform="rotate(275.098 25 25)"><animatetransform attributeType="xml" attributeName="transform" type="rotate" from="0 25 25" to="360 25 25" dur="0.6s" repeatCount="indefinite"></animatetransform></path></svg><style>#git_container{display: none;}</style></div><div id="git_container"></div></div>';
parent_div_git.insertAdjacentHTML("afterbegin",item_html)
console.log('已挂载gitcalendar')
}
if( document.getElementById('recent-posts') && (location.pathname ==='/'|| '/' ==='all')){
gitcalendar_injector_config()
GitCalendarInit("https://gitcalendar.fomal.cc/api?Fomalhaut-Blog",['#d9e0df', '#c6e0dc', '#a8dcd4', '#9adcd2', '#89ded1', '#77e0d0', '#5fdecb', '#47dcc6', '#39dcc3', '#1fdabe', '#00dab9'],'Fomalhaut-Blog')
}
</script><!-- hexo injector body_end end --><script src="/live2dw/lib/L2Dwidget.min.js?094cbace49a39548bed64abff5988b05"></script><script>L2Dwidget.init({"pluginRootPath":"live2dw/","pluginJsPath":"lib/","pluginModelPath":"assets/","tagMode":false,"debug":false,"model":{"jsonPath":"/live2dw/assets/koharu.model.json"},"display":{"position":"right","width":150,"height":300},"mobile":{"show":true},"log":false});</script></body></html>