[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"site-config":3,"primary-menu":20,"cat-high-concurrency":99,"catposts-high-concurrency":112,"post-detail-post-hc-seckill-a6b50dfa":221},{"config":4,"socialLinks":19},{"title":5,"subtitle":6,"logoUrl":7,"faviconUrl":8,"footerText":9,"beianIcp":10,"beianPublicSecurity":9,"seoDescription":11,"seoKeywords":12,"homepageTitle":13,"homepageSubtitle":14,"analyticsHeadCode":15,"planetQrcodeUrl":16,"planetIntroHtml":9,"planetCtaText":17,"updatedAt":18},"编码世界","用编码改变世界","\u002Fupload\u002F2026\u002F09\u002F2f277021172f43f6bb34e1c115760b7f.png","\u002Fupload\u002F2026\u002F09\u002Fdcbad022e68c4a729a5dc4997a9bba8a.png","","苏ICP备2026073884号","编码世界（mashangan.com）是面向 Java 后端与 Go 语言的系统化编程教程站：提供\nMyBatis Plus、Lombok、Java 8、IDEA、Docker 等原创图文教程，以及 JVM、并发、\nSpring、MySQL、Redis、消息队列、计算机网络等大厂面试八股题库，另有可落地的\n项目实战系列，帮你从入门到精通。","编码世界,Java教程,Go语言教程,Docker教程,MyBatis Plus教程,Lombok教程, Java 8新特性,IDEA教程,Java面试题,八股文,JVM面试题,Java并发面试题, MySQL面试题,Redis面试题,Spring面试题,消息队列面试题,高并发,分库分表, Netty面试题,计算机网络面试题,AI Agent,RAG,程序员学习路线","Java全栈系统化编程教程","覆盖 MyBatis Plus、Lombok、Java 8、IDEA、Go、Docker 等原创图文教程，配套大厂面试八股题库，从入门到精通，持续更新","\u003Cscript>\nvar _hmt = _hmt || [];\n(function() {\n  var hm = document.createElement(\"script\");\n  hm.src = \"https:\u002F\u002Fhm.baidu.com\u002Fhm.js?f00af7e56d956c02e11efed4131379b0\";\n  var s = document.getElementsByTagName(\"script\")[0]; \n  s.parentNode.insertBefore(hm, s);\n})();\n\u003C\u002Fscript>\n","\u002Fupload\u002F2026\u002F09\u002Fc1a8f5de46584d3eb0bc762c180a5db9.png","扫码加入知识星球","2026-09-29T14:56:02.498693Z",[],{"metadata":21,"spec":24,"menuItems":34},{"name":22,"creationTimestamp":23},"primary","2026-09-12T06:13:55.024154Z",{"displayName":25,"menuItems":26},"主菜单",[27,28,29,30,31,32,33],"88c3f10b-321c-4092-86a8-70db00251b74","menu-item-izrtmxer","c4c814d1-0c2c-456b-8c96-4864965fee94","menu-item-column","menu-item-tools","menu-item-zsxq","menu-item-ocrxlczu",[35,44,54,63,72,81,90],{"displayName":36,"metadata":37,"spec":39,"status":42,"children":43},"首页",{"name":27,"creationTimestamp":38},"2026-09-12T06:13:54.422830Z",{"displayName":36,"href":40,"priority":41,"menuName":22},"\u002F",0,{"displayName":36,"href":40},[],{"displayName":45,"metadata":46,"spec":48,"status":52,"children":53},"Java面试八股",{"name":28,"creationTimestamp":47},"2026-09-13T09:42:02.854891Z",{"displayName":45,"href":49,"target":50,"priority":51,"menuName":22},"\u002Fjava-interview","_self",1,{"displayName":45,"href":49},[],{"displayName":55,"metadata":56,"spec":58,"status":61,"children":62},"文章",{"name":29,"creationTimestamp":57},"2026-09-12T06:13:54.457307Z",{"displayName":55,"href":59,"priority":60,"menuName":22},"\u002Farchives",2,{"displayName":55,"href":59},[],{"displayName":64,"metadata":65,"spec":67,"status":70,"children":71},"项目实战",{"name":30,"creationTimestamp":66},"2026-09-14T00:35:08.138170Z",{"displayName":64,"href":68,"target":50,"priority":69,"menuName":22},"\u002Fcolumn",3,{"displayName":64,"href":68},[],{"displayName":73,"metadata":74,"spec":76,"status":79,"children":80},"在线工具",{"name":31,"creationTimestamp":75},"2026-09-14T00:35:08.171474Z",{"displayName":73,"href":77,"target":50,"priority":78,"menuName":22},"\u002Ftools",4,{"displayName":73,"href":77},[],{"displayName":82,"metadata":83,"spec":85,"status":88,"children":89},"知识星球",{"name":32,"creationTimestamp":84},"2026-09-14T00:35:08.199145Z",{"displayName":82,"href":86,"target":50,"priority":87,"menuName":22},"\u002Fzsxq",5,{"displayName":82,"href":86},[],{"displayName":91,"metadata":92,"spec":94,"status":97,"children":98},"特价云服务器",{"name":33,"creationTimestamp":93},"2026-09-25T15:30:59.201614Z",{"displayName":91,"href":95,"target":50,"priority":96,"menuName":22},"\u002Fserver",6,{"displayName":91,"href":95},[],{"metadata":100,"spec":105,"status":110,"postCount":87},{"name":101,"creationTimestamp":102,"labels":103},"high-concurrency","2026-09-13T09:13:26.047027Z",{"haloweb.section":104},"interview",{"displayName":106,"slug":101,"cover":9,"description":107,"priority":108,"hideFromList":109,"preventParentPostCascadeQuery":109},"高并发面试题","高并发场景面试题：线程模型、锁优化、无锁化设计、缓存异步化与吞吐量提升实战。",31,false,{"permalink":111,"postCount":87,"visiblePostCount":87},"\u002Fcategories\u002Fhigh-concurrency",[113,137,158,179,200],{"metadata":114,"spec":117,"status":126,"categories":131},{"name":115,"creationTimestamp":116},"post-hc-seckill-a6b50dfa","2026-09-13T10:01:14.438458Z",{"title":118,"slug":119,"cover":9,"excerpt":120,"publishTime":122,"categories":123,"tags":124,"priority":41,"pinned":109,"deleted":109,"visible":125,"allowComment":121},"秒杀系统如何设计？","hc-seckill",{"raw":9,"autoGenerate":121},true,"2026-09-13T10:01:14.624258Z",[101],[],"PUBLIC",{"permalink":127,"excerpt":128,"lastModifyTime":129,"phase":130},"\u002Farchives\u002Fhc-seckill","一、挑战 高并发、库存有限、防超卖、防刷。 二、优化手段 1. 前端 按钮置灰，防止重复提交。 答题\u002F验证码防机器人。 2. 网关层 限流（用户维度、IP 维度）。 静态资源 CDN。 3. 应用层 Redis 预减库存，判断是否还有库存。 异步下单：请求写 MQ，消费者处理订单。 本地缓存挡热点商","2026-09-16T09:16:40.701998Z","PUBLISHED",[132],{"metadata":133,"spec":135,"status":136,"postCount":87},{"name":101,"creationTimestamp":102,"labels":134},{"haloweb.section":104},{"displayName":106,"slug":101,"cover":9,"description":107,"priority":108,"hideFromList":109,"preventParentPostCascadeQuery":109},{"permalink":111,"postCount":87,"visiblePostCount":87},{"metadata":138,"spec":141,"status":148,"categories":152},{"name":139,"creationTimestamp":140},"post-hc-degrade-2891db76","2026-09-13T10:01:14.271595Z",{"title":142,"slug":143,"cover":9,"excerpt":144,"publishTime":145,"categories":146,"tags":147,"priority":41,"pinned":109,"deleted":109,"visible":125,"allowComment":121},"服务降级和熔断的区别？","hc-degrade",{"raw":9,"autoGenerate":121},"2026-09-13T10:01:14.323663Z",[101],[],{"permalink":149,"excerpt":150,"lastModifyTime":151,"phase":130},"\u002Farchives\u002Fhc-degrade","一、降级（Degrade） 主动关闭非核心功能，保证核心功能可用。 如大促时关闭评论、推荐，保交易。 是一种策略，通常按预设规则触发。 二、熔断（Circuit Breaker） 下游服务故障时，上游不再调用，直接返回降级结果。 类似电路保险丝，防止故障蔓延。 基于错误率、响应时间等指标自动触发。 ","2026-09-16T09:16:39.827390Z",[153],{"metadata":154,"spec":156,"status":157,"postCount":87},{"name":101,"creationTimestamp":102,"labels":155},{"haloweb.section":104},{"displayName":106,"slug":101,"cover":9,"description":107,"priority":108,"hideFromList":109,"preventParentPostCascadeQuery":109},{"permalink":111,"postCount":87,"visiblePostCount":87},{"metadata":159,"spec":162,"status":169,"categories":173},{"name":160,"creationTimestamp":161},"post-hc-current-limit-1b6bf9d1","2026-09-13T10:01:14.087902Z",{"title":163,"slug":164,"cover":9,"excerpt":165,"publishTime":166,"categories":167,"tags":168,"priority":41,"pinned":109,"deleted":109,"visible":125,"allowComment":121},"常见的限流算法？","hc-current-limit",{"raw":9,"autoGenerate":121},"2026-09-13T10:01:14.146105Z",[101],[],{"permalink":170,"excerpt":171,"lastModifyTime":172,"phase":130},"\u002Farchives\u002Fhc-current-limit","一、固定窗口 把时间分成固定窗口，窗口内计数，超过阈值限流。 - 优点：简单。 - 缺点：窗口边界可能突刺（如窗口末尾和下一个窗口开头各来一半，合起来超限）。 二、滑动窗口 把窗口分成多个小格子，随时间滑动，统计格子总数。 - 解决固定窗口的边界问题。 - 实现稍复杂。 三、漏桶算法 请求进桶，桶以","2026-09-16T09:16:40.266278Z",[174],{"metadata":175,"spec":177,"status":178,"postCount":87},{"name":101,"creationTimestamp":102,"labels":176},{"haloweb.section":104},{"displayName":106,"slug":101,"cover":9,"description":107,"priority":108,"hideFromList":109,"preventParentPostCascadeQuery":109},{"permalink":111,"postCount":87,"visiblePostCount":87},{"metadata":180,"spec":183,"status":190,"categories":194},{"name":181,"creationTimestamp":182},"post-hc-cache-strategy-fbfb1ec0","2026-09-13T10:01:13.884052Z",{"title":184,"slug":185,"cover":9,"excerpt":186,"publishTime":187,"categories":188,"tags":189,"priority":41,"pinned":109,"deleted":109,"visible":125,"allowComment":121},"高并发下的缓存策略？","hc-cache-strategy",{"raw":9,"autoGenerate":121},"2026-09-13T10:01:13.929859Z",[101],[],{"permalink":191,"excerpt":192,"lastModifyTime":193,"phase":130},"\u002Farchives\u002Fhc-cache-strategy","一、缓存层级 L1：浏览器缓存。 L2：CDN 缓存。 L3：Nginx\u002F网关缓存。 L4：应用本地缓存（Caffeine、Guava）。 L5：分布式缓存（Redis）。 L6：数据库。 二、缓存更新策略 Cache Aside：应用先查缓存，没有查数据库，写入缓存。删除缓存（不是更新）。最常用。","2026-09-16T09:16:38.657076Z",[195],{"metadata":196,"spec":198,"status":199,"postCount":87},{"name":101,"creationTimestamp":102,"labels":197},{"haloweb.section":104},{"displayName":106,"slug":101,"cover":9,"description":107,"priority":108,"hideFromList":109,"preventParentPostCascadeQuery":109},{"permalink":111,"postCount":87,"visiblePostCount":87},{"metadata":201,"spec":204,"status":211,"categories":215},{"name":202,"creationTimestamp":203},"post-hc-optimize-58adf088","2026-09-13T10:01:13.708765Z",{"title":205,"slug":206,"cover":9,"excerpt":207,"publishTime":208,"categories":209,"tags":210,"priority":41,"pinned":109,"deleted":109,"visible":125,"allowComment":121},"高并发系统的优化手段有哪些？","hc-optimize",{"raw":9,"autoGenerate":121},"2026-09-13T10:01:13.755494Z",[101],[],{"permalink":212,"excerpt":213,"lastModifyTime":214,"phase":130},"\u002Farchives\u002Fhc-optimize","一、前端优化 CDN 加速静态资源。 浏览器缓存、资源合并压缩。 页面懒加载、预加载。 二、网关层 Nginx 负载均衡，动静分离。 限流（令牌桶、漏桶）。 缓存静态页面。 三、应用层 多级缓存：本地缓存（Caffeine）+ 分布式缓存（Redis）。 异步化：消息队列削峰填谷。 线程池调优，合理","2026-09-16T09:16:37.698197Z",[216],{"metadata":217,"spec":219,"status":220,"postCount":87},{"name":101,"creationTimestamp":102,"labels":218},{"haloweb.section":104},{"displayName":106,"slug":101,"cover":9,"description":107,"priority":108,"hideFromList":109,"preventParentPostCascadeQuery":109},{"permalink":111,"postCount":87,"visiblePostCount":87},{"metadata":222,"spec":223,"status":227,"categories":228,"content":234},{"name":115,"creationTimestamp":116},{"title":118,"slug":119,"cover":9,"excerpt":224,"publishTime":122,"categories":225,"tags":226,"priority":41,"pinned":109,"deleted":109,"visible":125,"allowComment":121},{"raw":9,"autoGenerate":121},[101],[],{"permalink":127,"excerpt":128,"lastModifyTime":129,"phase":130},[229],{"metadata":230,"spec":232,"status":233,"postCount":87},{"name":101,"creationTimestamp":102,"labels":231},{"haloweb.section":104},{"displayName":106,"slug":101,"cover":9,"description":107,"priority":108,"hideFromList":109,"preventParentPostCascadeQuery":109},{"permalink":111,"postCount":87,"visiblePostCount":87},{"content":235,"raw":235},"\u003Ch2>一、挑战\u003C\u002Fh2>\n\u003Cp>高并发、库存有限、防超卖、防刷。\u003C\u002Fp>\n\u003Ch2>二、优化手段\u003C\u002Fh2>\n\u003Ch3>1. 前端\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>按钮置灰，防止重复提交。\u003C\u002Fli>\n\u003Cli>答题\u002F验证码防机器人。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>2. 网关层\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>限流（用户维度、IP 维度）。\u003C\u002Fli>\n\u003Cli>静态资源 CDN。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>3. 应用层\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>Redis 预减库存，判断是否还有库存。\u003C\u002Fli>\n\u003Cli>异步下单：请求写 MQ，消费者处理订单。\u003C\u002Fli>\n\u003Cli>本地缓存挡热点商品。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>4. 数据层\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>Redis 存库存，扣减用 Lua 保证原子。\u003C\u002Fli>\n\u003Cli>数据库乐观锁防超卖：update stock set count=count-1 where id=? and count&gt;0。\u003C\u002Fli>\n\u003Cli>订单表唯一索引（user_id + goods_id）防重复下单。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>三、流程\u003C\u002Fh2>\n\u003Col>\n\u003Cli>用户请求秒杀 → 网关限流。\u003C\u002Fli>\n\u003Cli>Redis 检查库存（Lua 原子操作）。\u003C\u002Fli>\n\u003Cli>有库存 → 扣减 + 发 MQ。\u003C\u002Fli>\n\u003Cli>消费者创建订单 + 数据库扣库存。\u003C\u002Fli>\n\u003Cli>返回排队中，客户端轮询结果。\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Ch2>四、关键\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>库存用 Redis 挡大部分流量。\u003C\u002Fli>\n\u003Cli>MQ 削峰，数据库只处理真实订单。\u003C\u002Fli>\n\u003Cli>幂等：用户+商品唯一。\u003C\u002Fli>\n\u003C\u002Ful>"]