一，基本方法
上节实现了netty的基本连接，这节加入spring来管理netty，由spring来开启netty服务。
在netty服务器中，我们建立了三个类：HelloServer（程序主入口） ， HelloServerInitializer（传输通道初始化），HelloServerHandler（业务控制器）
这三个类中HelloServer中new了一个HelloServerInitializer，在HelloServerInitializer最后又new了一个HelloServerHandler。其中需要new的地方，就是spring要管理的地方。
二，实现源码
1，相关准备
导入需要的JAR包和相关依赖，主要是spring，log4j，netty等，后面的项目源码中包含了所有jar包；
另外你可以使用maven来构建项目，添加各种jar包。
2，主程序TestSrping.java
主程序很简单，就是加载spring配置文件就可以了。
package com.wayhb; import org.apache.log4j.Logger; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestSpring { private static Logger log = Logger.getLogger(TestSpring.class); public static void main(String[] args) { // TODO Auto-generated method stub //加载spirng配置文件 ApplicationContext context= new ClassPathXmlApplicationContext("server.xml"); } }
3，spring的XML配置单server.xml和LOG4J配置文件
server.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:lang="http://www.springframework.org/schema/lang" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd" default-lazy-init="false" default-autowire="byName"> <!-- <bean id="user" class="com.wayhb.User"> <property name="userid" value="20"></property> <property name="username" value="wayhb"></property> </bean>--> <!--开启注解方式，扫描com.wayhb,com.netty两个包路径--> <context:annotation-config/> <context:component-scan base-package="com.wayhb,com.netty" /> <!-- 传统方法配置BEAN <bean id="helloServer" class="com.netty.HelloServer" init-method="serverStart"> <property name="helloServerInitializer" ref="helloServerInitializer"></property> </bean> <bean id="helloServerInitializer" class="com.netty.HelloServerInitializer"> <property name="helloServerHandler" ref="helloServerHandler"></property> </bean> <bean id="helloServerHandler" class="com.netty.HelloServerHandler" scope="prototype"></bean> --> </beans>
log4j.properties
### 设置### #log4j.rootLogger = debug,stdout,D,E log4j.rootLogger = debug,stdout ### 输出信息到控制抬 ### log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n ### 输出DEBUG 级别以上的日志到=E://logs/error.log ### #log4j.appender.D = org.apache.log4j.DailyRollingFileAppender #log4j.appender.D.File = C://logs/log.log #log4j.appender.D.Append = true #log4j.appender.D.Threshold = DEBUG #log4j.appender.D.layout = org.apache.log4j.PatternLayout #log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n ### 输出ERROR 级别以上的日志到=E://logs/error.log ### #log4j.appender.E = org.apache.log4j.DailyRollingFileAppender #log4j.appender.E.File =C://logs/error.log #log4j.appender.E.Append = true #log4j.appender.E.Threshold = ERROR #log4j.appender.E.layout = org.apache.log4j.PatternLayout #log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
其中输出功能是关闭的，需要的话去掉#就可以了
4，HelloServer
package com.netty; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.ChannelFuture; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.nio.NioServerSocketChannel; import javax.annotation.PostConstruct; import org.apache.log4j.Logger; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; //注解方式注入bean，名字是helloServer @Service("helloServer") public class HelloServer { private static Logger log = Logger.getLogger(HelloServer.class); /** * 服务端监听的端口地址 */ private static final int portNumber = 7878; //自动装备变量，spring会根据名字或者类型来装备这个变量，注解方式不需要set get方法了 @Autowired private HelloServerInitializer helloServerInitializer; //程序初始方法入口注解，提示spring这个程序先执行这里 @PostConstruct public void serverStart() throws InterruptedException{ EventLoopGroup bossGroup = new NioEventLoopGroup(); EventLoopGroup workerGroup = new NioEventLoopGroup(); try { ServerBootstrap b = new ServerBootstrap(); b.group(bossGroup, workerGroup); b.channel(NioServerSocketChannel.class); b.childHandler(helloServerInitializer); // 服务器绑定端口监听 ChannelFuture f = b.bind(portNumber).sync(); // 监听服务器关闭监听 f.channel().closeFuture().sync(); log.info("###########################################"); // 可以简写为 /* b.bind(portNumber).sync().channel().closeFuture().sync(); */ } finally { bossGroup.shutdownGracefully(); workerGroup.shutdownGracefully(); } } }
注解方式更加简便，配置内容少了很多
5，HelloServerInitializer
package com.netty; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Service; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelPipeline; import io.netty.channel.socket.SocketChannel; import io.netty.handler.codec.DelimiterBasedFrameDecoder; import io.netty.handler.codec.Delimiters; import io.netty.handler.codec.string.StringDecoder; import io.netty.handler.codec.string.StringEncoder; @Service("helloServerInitializer") public class HelloServerInitializer extends ChannelInitializer<SocketChannel> { @Autowired private HelloServerHandler helloServerHandler; @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); // 以(" ")为结尾分割的 解码器 pipeline.addLast("framer", new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter())); // 字符串解码 和 编码 pipeline.addLast("decoder", new StringDecoder()); pipeline.addLast("encoder", new StringEncoder()); // 自己的逻辑Handler pipeline.addLast("handler", helloServerHandler); } }
6，HelloServerHandler
package com.netty; import java.net.InetAddress; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Service; import io.netty.channel.Channel; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.channel.group.ChannelGroup; import io.netty.channel.group.DefaultChannelGroup; import io.netty.util.concurrent.GlobalEventExecutor; import io.netty.channel.ChannelHandler.Sharable; @Service("helloServerHandler") @Scope("prototype") //特别注意这个注解@Sharable，默认的4版本不能自动导入匹配的包，需要手动加入 //地址是import io.netty.channel.ChannelHandler.Sharable; @Sharable public class HelloServerHandler extends SimpleChannelInboundHandler<String> { public static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE); @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { // (2) Channel incoming = ctx.channel(); for (Channel channel : channels) { channel.writeAndFlush("[SERVER] - " + incoming.remoteAddress() + " 加入 "); } channels.add(ctx.channel()); } @Override public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { // (3) Channel incoming = ctx.channel(); for (Channel channel : channels) { channel.writeAndFlush("[SERVER] - " + incoming.remoteAddress() + " 离开 "); } channels.remove(ctx.channel()); } @Override protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception { // 收到消息直接打印输出 System.out.println(ctx.channel().remoteAddress() + " Say : " + msg); // 返回客户端消息 - 我已经接收到了你的消息 ctx.writeAndFlush("Received your message ! "); } /* * * 覆盖 channelActive 方法 在channel被启用的时候触发 (在建立连接的时候) * * channelActive 和 channelInActive 在后面的内容中讲述，这里先不做详细的描述 * */ @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { System.out.println("RamoteAddress : " + ctx.channel().remoteAddress() + " active !"); ctx.writeAndFlush( "Welcome to " + InetAddress.getLocalHost().getHostName() + " service! "); super.channelActive(ctx); } }
特别注意这个注解@Sharable，默认的4版本不能自动导入匹配的包，需要手动加入
地址是import io.netty.channel.ChannelHandler.Sharable;
三，运行测试
1，打开TestSpring.java，右键运行，正常情况下服务器会开启；
2，打开上节写的项目，打开HelloClient.java，右键运行；
3，HelloClient.java上再运行一次，出现两个客户端，如果都连接成功，说明项目没有问题。
注意事项：netty4需要@Sharable才可以开启多个handler，所以需要多个连接的handler类上要加入注解@Sharable，该注解自动导入有问题，手动加入包import io.netty.channel.ChannelHandler.Sharable;