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Java NIO详解:Channel, Buffer与Selector核心概念

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"Netty NIO基础介绍" Netty是一款高性能、异步事件驱动的网络应用框架,用于快速开发可维护的高性能协议服务器和客户端。NIO(Non-blocking I/O)是非阻塞式I/O,在Java中通过java.nio包实现,提供了与传统阻塞I/O不同的编程模型。本篇将介绍Netty中的NIO基础,包括三大核心组件:Channel、Buffer和Selector。 ### 1. NIO三大组件 #### 1.1 Channel & Buffer **Channel** 可以被理解为数据传输的双向通道,它可以从Channel读取数据到Buffer,也可以将Buffer中的数据写入Channel。与传统的流(Stream)不同,流只能进行单向数据传输,而Channel支持双向。在Java NIO中,常见的Channel类型有: - **FileChannel**:用于文件操作。 - **DatagramChannel**:用于UDP通信。 - **SocketChannel**:用于TCP连接。 - **ServerSocketChannel**:用于监听TCP连接请求。 **Buffer** 作为数据缓冲区,用于存储和传输数据。Java NIO提供多种类型的Buffer,如: - **ByteBuffer** - **MappedByteBuffer**:内存映射文件缓冲区。 - **DirectByteBuffer**:直接内存缓冲区,减少系统调用,提高性能。 - **HeapByteBuffer**:基于堆内存的缓冲区。 - **ShortBuffer**、**IntBuffer**、**LongBuffer**、**FloatBuffer**、**DoubleBuffer**、**CharBuffer**:针对特定数据类型的缓冲区。 #### 1.2 Selector **Selector** 是NIO中的关键组件,用于检测多个通道上的事件,如连接、读写等。传统的多线程或线程池方案在处理大量连接时存在内存占用高、线程上下文切换成本高等问题。Selector解决了这些问题,它允许一个线程高效地管理多个非阻塞的Channel,当某个Channel准备好进行读写操作时,Selector会通知线程进行处理,从而提高了系统的并发能力。 ### 2. NIO与多线程、线程池对比 - **多线程版**:每个连接对应一个线程,内存占用高,线程上下文切换成本大,适用于连接数较少的场景。 - **线程池版**:使用线程池,减少线程创建销毁的开销,但阻塞模式下线程只能处理一个连接,适合短连接场景。 - **Selector版**:一个线程管理多个非阻塞Channel,减少了线程数量,降低了内存占用和上下文切换成本,适合连接数特别多的高并发场景。 ### 3. Netty中的NIO应用 Netty充分利用了NIO的优势,通过Selector监控多个Channel的事件,减少了线程资源消耗,提高了服务端的并发处理能力。Netty还提供了丰富的编码解码器、事件驱动模型、线程模型等特性,使得开发者可以更方便地构建高效、可靠的网络应用程序。 Netty中的NIO基础包括Channel、Buffer和Selector三个核心组件,它们共同构建了一个高效的网络通信模型,尤其适合处理大规模并发连接的场景。通过理解并熟练掌握这些概念,开发者能够更好地利用Netty构建高性能的网络应用。

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com.rulin.BlogApplication SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/C:/Users/ASUS/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/C:/Users/ASUS/.m2/repository/org/slf4j/slf4j-log4j12/1.7.30/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder] ____ ____ _____ U| _"\ u U /"___|u |"_ /u \| |_) |/ \| | _ / U / // | __/ | |_| | \/ /_ |_| \____| /____| ||>>_ _)(|_ _//<<,- (__)__) (__)__) (__) (_/ Gitee: https://gitee.com/chengxuru/rulin-blog 2025-06-27 16:08:19.529 [main] WARN o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext:596 - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'apiArticleController' defined in file [E:\AliCloud\rulin-blog\pblog\target\classes\com\rulin\controller\api\ApiArticleController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.rulin.service.ArticleService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {} 2025-06-27 16:08:19.578 [main] ERROR o.s.b.diagnostics.LoggingFailureAnalysisReporter:40 - *************************** APPLICATION FAILED TO START *************************** Description: Parameter 0 of constructor in com.rulin.controller.api.ApiArticleController required a bean of type 'com.rulin.service.ArticleService' that could not be found. Action: Consider defining a bean of type 'com.rulin.service.ArticleService' in your configuration. 进程已结束,退出代码为 1

filetype

#服务配置 server: port: 9065 max-http-header-size: 10240 compression: enabled: true # 是否启用压缩 mime-types: # 针对哪些响应类型进行压缩 - application/json - application/xml - text/html - text/xml - text/plain - text/css - text/javascript - application/javascript min-response-size: 1KB ssl: key-store: classpath:liquidwaste.xahaolan.com.pfx key-store-type: PKCS12 enabled: true key-store-password: rpp80md0 http2: enabled: true tomcat: keep-alive-timeout: 60000 # 单位毫秒,Keep‑Alive 最长持续 60s max-keep-alive-requests: 100 # 单条链接最多可复用 100 次 #spring相关配置 spring: profiles: active: prod servlet: multipart: #文件最大上传大小配置 最大上传100M max-request-size: 100MB #文件最大上传大小配置 最大上传100M max-file-size: 100MB jackson: time-zone: GMT+8 date-format: yyyy-MM-dd HH:mm:ss.SSS locale: zh_CN serialization: # 格式化输出 indent_output: false beetl: suffix: html #mybaits相关配置 mybatis-plus: mapper-locations: classpath*:com/haolan/**/mapping/*.xml, classpath*:vip/xiaonuo/**/mapping/*.xml, classpath:/META-INF/modeler-mybatis-mappings/*.xml configuration: map-underscore-to-camel-case: true cache-enabled: true lazy-loading-enabled: true multiple-result-sets-enabled: true log-impl: org.apache.ibatis.logging.nologging.NoLoggingImpl # log-impl: org.apache.ibatis.logging.stdout.StdOutImpl global-config: banner: false db-config: id-type: assign_id table-underline: true enable-sql-runner: true configuration-properties: prefix: #如果数据库为postgresql,则需要配置为blobType: BINARY blobType: BLOB #如果数据库为oracle或mssql,则需要配置为boolValue: 1 boolValue: true #libreoffice文档在线预览配置 # CentOS 下安装 libreoffice: # 安装:yum -y install libreoffice # Linux 中文字体乱码解决: # 1、上传 C:\Windows\Fonts 下的字体到 /usr/share/fonts/windows 目录 # 2、执行命令: chmod 644 /usr/share/fonts/windows/* && fc-cache -fv jodconverter: local: #暂时关闭预览,启动时会有点慢 enabled: false #设置libreoffice主目录 linux地址如:/usr/lib64/libreoffice office-home: C:\Program Files\LibreOffice #开启多个libreoffice进程,每个端口对应一个进程 port-numbers: 8100 #libreoffice进程重启前的最大进程数 max-tasks-per-process: 100 netty: websocket: # Websocket服务端口 port: 9068 # 绑定的网卡 ip: 0.0.0.0 # 消息帧最大体积 max-frame-size: 10240 # URI路径 path: /channel

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