springboot整合netty框架的方式有哪些
本篇内容主要讲解“springboot整合netty框架的方式有哪些”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“springboot整合netty框架的方式有哪些”吧!
netty作为一个高性能的io框架,是非好用的一个技术框架,
Netty 是一个基于NIO的客户、服务器端编程框架,使用Netty 可以确保你快速和简单的开发出一个网络应用,例如实现了某种协议的客户、服务端应用。Netty相当于简化和流线化了网络应用的编程开发过程,例如:基于TCP和UDP的socket服务开发。
“快速”和“简单”并不用产生维护性或性能上的问题。Netty 是一个吸收了多种协议(包括FTP、SMTP、HTTP等各种二进制文本协议)的实现经验,并经过相当精心设计的项目。最终,Netty 成功的找到了一种方式,在保证易于开发的同时还保证了其应用的性能,稳定性和伸缩性
首先整个项目引入pom
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.cxy</groupId> <artifactId>netty</artifactId> <version>0.0.1-SNAPSHOT</version> <name>netty</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> <version>4.1.25.Final</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
handler类是不会改变的
package com.cxy.netty.controller;import io.netty.buffer.ByteBuf;import io.netty.channel.ChannelFutureListener;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;import io.netty.util.CharsetUtil;public class EchoServerHandler extends ChannelInboundHandlerAdapter { @Override public void channelRead(ChannelHandlerContext ctx, Object msg){ ByteBuf in = (ByteBuf) msg; System.out.println("Server received: " + in.toString(CharsetUtil.UTF_8)); ctx.write(in); } public void channelReadComplete(ChannelHandlerContext ctx){ ctx.writeAndFlush(ChannelFutureListener.CLOSE); public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause){ cause.printStackTrace(); ctx.close();}
这个handler是我从官网上copy下来的
方式一:注解@PostConstruct
package com.cxy.netty.controller;import io.netty.bootstrap.ServerBootstrap;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelInitializer;import io.netty.channel.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.SocketChannel;import io.netty.channel.socket.nio.NioServerSocketChannel;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.boot.autoconfigure.web.ServerProperties;import org.springframework.stereotype.Component;import javax.annotation.PostConstruct;import javax.annotation.PreDestroy;import java.net.InetSocketAddress;@Componentpublic class NettyServer { @PostConstruct public void start() throws Exception { System.out.println("启动记载netty"); EventLoopGroup boss = new NioEventLoopGroup(); EventLoopGroup work = new NioEventLoopGroup(); ServerBootstrap b = new ServerBootstrap(); b.group(boss,work) .channel(NioServerSocketChannel.class) .localAddress(new InetSocketAddress(8082)) .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel ch) throws Exception { ch.pipeline().addLast(new EchoServerHandler()); } }); System.out.println("启动加载netty2"); ChannelFuture channelFuturef = b.bind().sync(); if (channelFuturef.isSuccess()){ System.out.println("启动成功"); } }}
点击启动:
看日志:
说明已经启动
那么这个注解为什么这么神奇呢:
大概的意思,大家看下,意思就是这个方法会随着类的加载而加载,初始化加载的意思:
@Documented@Retention (RUNTIME)@Target(METHOD)public @interface PostConstruct {}
方式二:利用监听器启动:
package com.cxy.netty.controller;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class InitListener implements ServletContextListener { @Override public void contextInitialized(ServletContextEvent sce) { NettyServer nettyServer = new NettyServer(8081); try { nettyServer.start(); } catch (Exception e) { e.printStackTrace(); } } @Override public void contextDestroyed(ServletContextEvent sce) { }}
启动类:
package com.cxy.netty;import com.cxy.netty.controller.InitListener;import com.cxy.netty.controller.NettyServer;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;import org.springframework.context.annotation.Bean;@SpringBootApplicationpublic class NettyApplication { @SuppressWarnings({ "rawtypes", "unchecked" }) @Bean public ServletListenerRegistrationBean servletListenerRegistrationBean() { ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean(); servletListenerRegistrationBean.setListener(new InitListener()); return servletListenerRegistrationBean; } public static void main(String[] args) { SpringApplication.run(NettyApplication.class, args); }}
看日志:
方式三 :利用ApplicationListener 上下文监听器
package com.cxy.netty.controller;import com.cxy.netty.controller.NettyServer;import org.springframework.context.ApplicationListener;import org.springframework.context.event.ContextRefreshedEvent;import org.springframework.stereotype.Component;@Componentpublic class NettyBooter implements ApplicationListener<ContextRefreshedEvent> { @Override public void onApplicationEvent(ContextRefreshedEvent event) { NettyServer nettyServer = new NettyServer(8081); try { nettyServer.start(); } catch (Exception e) { e.printStackTrace(); } }}
启动类:
package com.cxy.netty;import com.cxy.netty.controller.NettyServer;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;import org.springframework.context.annotation.Bean;@SpringBootApplicationpublic class NettyApplication { public static void main(String[] args) { SpringApplication.run(NettyApplication.class, args); }}
看启动日志:
方式四:commiandLinerunner启动
package com.cxy.netty;import com.cxy.netty.controller.NettyServer;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;import org.springframework.context.annotation.Bean;@SpringBootApplicationpublic class NettyApplication implements CommandLineRunner { public static void main(String[] args) { SpringApplication.run(NettyApplication.class, args); } @Override public void run(String... args) throws Exception { NettyServer echoServer = new NettyServer(8083); echoServer.start(); }}
看日志:
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