springboot整合netty框架的方式小结
目录
- 方式一:注解@PostConstruct
- 方式二:利用监听器启动:
- 方式三 :利用ApplicationListener 上下文监听器
- 方式四:commiandLinerunner启动
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
那么如何和springboot这个比较流行的框架进行整合呢?
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; @Component public class NettyServer { /*private int port =8080; public int getPort() { return port; } public void setPort(int port) { this.port = port; } public NettyServer(int port) { this.port = port; }*/ @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; /** * 系统初始化监听器 * @author Administrator * */ 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; @SpringBootApplication public class NettyApplication { /** * 注册监听器 * @return */ @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; @Component public 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; @SpringBootApplication public class NettyApplication { /** * 注册监听器 * @return */ /* @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; /* @SpringBootApplication public class NettyApplication { */ /** * 注册监听器 * @return *//* */ /* @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); } } */ @SpringBootApplication public 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:
代表这四种都可以启动成功,下章接再分析后面三种为什么可以启动成功
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