Netty服务器端
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class ServerHandler extends SimpleChannelHandler { /** * 通道关闭的时候触发 */ @Override public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception { System.out.println("channelClosed"); } /** * 必须是连接已经建立,关闭通道的时候才会触发. */ @Override public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception { super.channelDisconnected(ctx, e); System.out.println("channelDisconnected"); } /** * 捕获异常 */ @Override public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception { super.exceptionCaught(ctx, e); System.out.println("exceptionCaught"); } /** * 接受消息 */ public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception { super.messageReceived(ctx, e); // System.out.println("messageReceived"); System.out.println("服务器端收到客户端消息:"+e.getMessage()); //回复内容 ctx.getChannel().write("好的"); } } // netty 服务器端 public class NettyServer { public static void main(String[] args) { // 创建服务类对象 ServerBootstrap serverBootstrap = new ServerBootstrap(); // 创建两个线程池 分别为监听监听端口 ，nio监听 ExecutorService boos = Executors.newCachedThreadPool(); ExecutorService worker = Executors.newCachedThreadPool(); // 设置工程 并把两个线程池加入中 serverBootstrap.setFactory(new NioServerSocketChannelFactory(boos, worker)); // 设置管道工厂 serverBootstrap.setPipelineFactory(new ChannelPipelineFactory() { public ChannelPipeline getPipeline() throws Exception { ChannelPipeline pipeline = Channels.pipeline(); //将数据转换为string类型. pipeline.addLast("decoder", new StringDecoder()); pipeline.addLast("encoder", new StringEncoder()); pipeline.addLast("serverHandler", new ServerHandler()); return pipeline; } }); // 绑定端口号 serverBootstrap.bind(new InetSocketAddress(9090)); System.out.println("netty server启动...."); } } |
Netty客户端
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package com.itmayiedu; import java.net.InetSocketAddress; import java.util.Scanner; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import org.jboss.netty.bootstrap.ClientBootstrap; import org.jboss.netty.channel.Channel; import org.jboss.netty.channel.ChannelFuture; import org.jboss.netty.channel.ChannelHandlerContext; import org.jboss.netty.channel.ChannelPipeline; import org.jboss.netty.channel.ChannelPipelineFactory; import org.jboss.netty.channel.ChannelStateEvent; import org.jboss.netty.channel.Channels; import org.jboss.netty.channel.ExceptionEvent; import org.jboss.netty.channel.MessageEvent; import org.jboss.netty.channel.SimpleChannelHandler; import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory; import org.jboss.netty.handler.codec.string.StringDecoder; import org.jboss.netty.handler.codec.string.StringEncoder; class ClientHandler extends SimpleChannelHandler { /** * 通道关闭的时候触发 */ @Override public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception { System.out.println("channelClosed"); } /** * 必须是连接已经建立,关闭通道的时候才会触发. */ @Override public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception { super.channelDisconnected(ctx, e); System.out.println("channelDisconnected"); } /** * 捕获异常 */ @Override public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception { super.exceptionCaught(ctx, e); System.out.println("exceptionCaught"); } /** * 接受消息 */ public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception { super.messageReceived(ctx, e); // System.out.println("messageReceived"); System.out.println("服务器端向客户端回复内容:"+e.getMessage()); //回复内容 // ctx.getChannel().write("好的"); } } public class NettyClient { public static void main(String[] args) { System.out.println("netty client启动..."); // 创建客户端类 ClientBootstrap clientBootstrap = new ClientBootstrap(); // 线程池 ExecutorService boos = Executors.newCachedThreadPool(); ExecutorService worker = Executors.newCachedThreadPool(); clientBootstrap.setFactory(new NioClientSocketChannelFactory(boos, worker)); clientBootstrap.setPipelineFactory(new ChannelPipelineFactory() { public ChannelPipeline getPipeline() throws Exception { ChannelPipeline pipeline = Channels.pipeline(); // 将数据转换为string类型. pipeline.addLast("decoder", new StringDecoder()); pipeline.addLast("encoder", new StringEncoder()); pipeline.addLast("clientHandler", new ClientHandler()); return pipeline; } }); //连接服务端 ChannelFuture connect = clientBootstrap.connect(new InetSocketAddress("127.0.0.1", 9090)); Channel channel = connect.getChannel(); System.out.println("client start"); Scanner scanner= new Scanner(System.in); while (true) { System.out.println("请输输入内容..."); channel.write(scanner.next()); } } } |
Maven坐标
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<dependency> <groupId>io.netty</groupId> <artifactId>netty</artifactId> <version>3.3.0.Final</version> </dependency>
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Netty5.0用法
创建服务器端
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class ServerHandler extends ChannelHandlerAdapter { /** * 当通道被调用,执行该方法 */ @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { // 接收数据 String value = (String) msg; System.out.println("Server msg:" + value); // 回复给客户端 “您好!” String res = "好的..."; ctx.writeAndFlush(Unpooled.copiedBuffer(res.getBytes())); }
}
public class NettyServer {
public static void main(String[] args) throws InterruptedException { System.out.println("服务器端已经启动...."); // 1.创建2个线程,一个负责接收客户端连接， 一个负责进行 传输数据 NioEventLoopGroup pGroup = new NioEventLoopGroup(); NioEventLoopGroup cGroup = new NioEventLoopGroup(); // 2. 创建服务器辅助类 ServerBootstrap b = new ServerBootstrap(); b.group(pGroup, cGroup).channel(NioServerSocketChannel.class).option(ChannelOption.SO_BACKLOG, 1024) // 3.设置缓冲区与发送区大小 .option(ChannelOption.SO_SNDBUF, 32 * 1024).option(ChannelOption.SO_RCVBUF, 32 * 1024) .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel sc) throws Exception { sc.pipeline().addLast(new StringDecoder()); sc.pipeline().addLast(new ServerHandler()); } }); ChannelFuture cf = b.bind(8080).sync(); cf.channel().closeFuture().sync(); pGroup.shutdownGracefully(); cGroup.shutdownGracefully(); }
}
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创建客户端
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class ClientHandler extends ChannelHandlerAdapter {
/** * 当通道被调用,执行该方法 */ @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { // 接收数据 String value = (String) msg; System.out.println("client msg:" + value); }
}
public class NettyClient {
public static void main(String[] args) throws InterruptedException { System.out.println("客户端已经启动...."); // 创建负责接收客户端连接 NioEventLoopGroup pGroup = new NioEventLoopGroup(); Bootstrap b = new Bootstrap(); b.group(pGroup).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel sc) throws Exception { sc.pipeline().addLast(new StringDecoder()); sc.pipeline().addLast(new ClientHandler()); } }); ChannelFuture cf = b.connect("127.0.0.1", 8080).sync(); cf.channel().writeAndFlush(Unpooled.wrappedBuffer("itmayiedu".getBytes())); cf.channel().writeAndFlush(Unpooled.wrappedBuffer("itmayiedu".getBytes())); // 等待客户端端口号关闭 cf.channel().closeFuture().sync(); pGroup.shutdownGracefully();
}
} |
Maven坐标
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<dependencies> <!-- https://mvnrepository.com/artifact/io.netty/netty-all --> <dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> <version>5.0.0.Alpha2</version> </dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.marshalling/jboss-marshalling --> <dependency> <groupId>org.jboss.marshalling</groupId> <artifactId>jboss-marshalling</artifactId> <version>1.3.19.GA</version> </dependency> <!-- https://mvnrepository.com/artifact/org.jboss.marshalling/jboss-marshalling-serial --> <dependency> <groupId>org.jboss.marshalling</groupId> <artifactId>jboss-marshalling-serial</artifactId> <version>1.3.18.GA</version> <scope>test</scope> </dependency>
</dependencies> |