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Java Netty (2)
通过一个实例来说明Netty的使用。用1个服务器连接5个客户端线程，客户端连接上服务器以后就向服务器发送消息，服务器接收到消息后向客户端返回消息，客户端接收到消息以后，等待随机的时间，再向服务端发送消息，这样一直循环下去。
项目结构：
NettyServer.java:
package Server;import java.net.InetSocketAddress;import java.util.concurrent.Executors;import org.jboss.netty.bootstrap.ServerBootstrap; import org.jboss.netty.channel.*; import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory; import org.jboss.netty.handler.execution.ExecutionHandler;import org.jboss.netty.handler.execution.OrderedMemoryAwareThreadPoolExecutor;import Util.Constant;public class NettyServer { public static String host = "127.0.0.1"; // 创建1个线程池 static ExecutionHandler executionHandler = new ExecutionHandler(new OrderedMemoryAwareThreadPoolExecutor(16, 1048576, 1048576)); public static void main(String[] args) { // ChannelFactory final ChannelFactory channelFactory = new NioServerSocketChannelFactory( // Boss线程池,处理Socket请求 Executors.newCachedThreadPool(), // Worker线程池,由于使用的是NIO,1个Worker线程可以管理多个Channel Executors.newCachedThreadPool()); // ServerBootstrap ServerBootstrap bootstrap = new ServerBootstrap(channelFactory); ServerPipelineFactory serverPipelineFactory = new ServerPipelineFactory(executionHandler); bootstrap.setPipelineFactory(serverPipelineFactory); // 禁用nagle算法 bootstrap.setOption("child.tcpNoDelay", true); // 启用TCP保活检测 bootstrap.setOption("child.keepAlive", true); // 监听5个端口 bootstrap.bind(new InetSocketAddress(Constant.p1)); System.out.println("Listening port " + Constant.p1 + "..."); bootstrap.bind(new InetSocketAddress(Constant.p2)); System.out.println("Listening port " + Constant.p2 + "..."); bootstrap.bind(new InetSocketAddress(Constant.p3)); System.out.println("Listening port " + Constant.p3 + "..."); bootstrap.bind(new InetSocketAddress(Constant.p4)); System.out.println("Listening port " + Constant.p4 + "..."); bootstrap.bind(new InetSocketAddress(Constant.p5)); System.out.println("Listening port " + Constant.p5 + "..."); }}
ServerPipelineFactory.java:
package Server;import org.jboss.netty.channel.ChannelPipeline;import org.jboss.netty.channel.ChannelPipelineFactory;import org.jboss.netty.channel.Channels;import org.jboss.netty.handler.codec.string.StringDecoder;import org.jboss.netty.handler.codec.string.StringEncoder;import org.jboss.netty.handler.execution.ExecutionHandler;public class ServerPipelineFactory implements ChannelPipelineFactory { private final ExecutionHandler executionHandler; public ServerPipelineFactory(ExecutionHandler executionHandler){ this.executionHandler = executionHandler; } @Override public ChannelPipeline getPipeline() throws Exception { // TODO Auto-generated method stub return Channels.pipeline( new StringEncoder(), new StringDecoder(), // 多个pipeline之间必须共享同一个ExecutionHandler,放在业务逻辑handler之前 executionHandler, // 业务逻辑handler new MyServerHandler()); } }
MyServerHandler.java:
package Server;import org.jboss.netty.channel.Channel;import org.jboss.netty.channel.ChannelHandlerContext;import org.jboss.netty.channel.ChannelStateEvent;import org.jboss.netty.channel.ExceptionEvent;import org.jboss.netty.channel.MessageEvent;import org.jboss.netty.channel.SimpleChannelHandler;import Util.Tool;public class MyServerHandler extends SimpleChannelHandler{ @SuppressWarnings("static-access") @Override public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception { System.out.println("Server received:" + e.getMessage()); // 休息随机秒后发送消息 Thread th = Thread.currentThread(); int interval = Tool.getInterval(100); th.sleep(interval*1000); e.getChannel().write("from Server: Hello!"); super.messageReceived(ctx, e); } @Override public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception { e.getCause().printStackTrace(); Channel ch = e.getChannel(); ch.close(); super.exceptionCaught(ctx, e); } @Override public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception { System.out.println("A client connected!"); super.channelConnected(ctx, e); }}
NettyClient.java:
package Client;import java.net.InetSocketAddress;import java.util.concurrent.Executors;import org.jboss.netty.bootstrap.ClientBootstrap; import org.jboss.netty.channel.*; import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory; import org.jboss.netty.handler.execution.ExecutionHandler;import org.jboss.netty.handler.execution.OrderedMemoryAwareThreadPoolExecutor;import Util.Constant;public class NettyClient extends Thread{ public static String host = "127.0.0.1"; ClientBootstrap bootstrap; int port; // 创建1个线程池 static ExecutionHandler executionHandler = new ExecutionHandler(new OrderedMemoryAwareThreadPoolExecutor(16, 1048576, 1048576)); public NettyClient(int port) { this.port = port; // ChannelFactory final ChannelFactory channelFactory = new NioClientSocketChannelFactory( // Boss线程池 Executors.newCachedThreadPool(), // Worker线程池 Executors.newCachedThreadPool()); // ServerBootstrap bootstrap = new ClientBootstrap(channelFactory); ClientPipelineFactory clientPipelineFactory = new ClientPipelineFactory(executionHandler); bootstrap.setPipelineFactory(clientPipelineFactory); bootstrap.setOption("tcpNoDelay" ,true); bootstrap.setOption("keepAlive", true); bootstrap.connect(new InetSocketAddress(port)); } public void run(){ ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port)); // 开始试图连接 System.out.println("Connecting to port " + port + "..."); // 等待直到连接关闭或失败 future.getChannel().getCloseFuture().awaitUninterruptibly(); // 关闭线程池准备退出 bootstrap.releaseExternalResources(); } public static void main(String[] args) { NettyClient nc1 = new NettyClient(Constant.p1); NettyClient nc2 = new NettyClient(Constant.p2); NettyClient nc3 = new NettyClient(Constant.p3); NettyClient nc4 = new NettyClient(Constant.p4); NettyClient nc5 = new NettyClient(Constant.p5); nc1.start(); nc2.start(); nc3.start(); nc4.start(); nc5.start(); }}
ClientPipelineFactory.java:
package Client;import org.jboss.netty.channel.ChannelPipeline;import org.jboss.netty.channel.ChannelPipelineFactory;import org.jboss.netty.channel.Channels;import org.jboss.netty.handler.codec.string.StringDecoder;import org.jboss.netty.handler.codec.string.StringEncoder;import org.jboss.netty.handler.execution.ExecutionHandler;public class ClientPipelineFactory implements ChannelPipelineFactory { private final ExecutionHandler executionHandler; public ClientPipelineFactory(ExecutionHandler executionHandler){ this.executionHandler = executionHandler; } @Override public ChannelPipeline getPipeline() throws Exception { // TODO Auto-generated method stub return Channels.pipeline( new StringEncoder(), new StringDecoder(), // 多个pipeline之间必须共享同一个ExecutionHandler,放在业务逻辑handler之前 executionHandler, // 业务逻辑handler new MyClientHandler()); } }
MyClientHandler.java:
package Client;import org.jboss.netty.channel.Channel;import org.jboss.netty.channel.ChannelHandlerContext;import org.jboss.netty.channel.ChannelStateEvent;import org.jboss.netty.channel.ExceptionEvent;import org.jboss.netty.channel.MessageEvent;import org.jboss.netty.channel.SimpleChannelHandler;import org.jboss.netty.channel.SimpleChannelUpstreamHandler;import Util.Tool;public class MyClientHandler extends SimpleChannelHandler{ // 连接到服务端时,发出消息 @Override public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception { System.out.println("Connected to Server!"); e.getChannel().write("from Client: Hello! " + System.currentTimeMillis()); super.channelConnected(ctx, e); } @SuppressWarnings("static-access") @Override public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception { System.out.println("Client Received:" + e.getMessage()); // 休息随机秒后发送消息 Thread th = Thread.currentThread(); int interval = Tool.getInterval(5); th.sleep(interval*1000); e.getChannel().write("from Client: Hello! " + System.currentTimeMillis()); super.messageReceived(ctx, e); } @Override public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception { e.getCause().printStackTrace(); Channel ch = e.getChannel(); ch.close(); super.exceptionCaught(ctx, e); } }
Constant.java:
package Util;public class Constant { final static int start = 10000; public static int p1 = start + 1; public static int p2 = start + 2; public static int p3 = start + 3; public static int p4 = start + 4; public static int p5 = start + 5;}
Tool.java:
package Util;import java.util.Random;public class Tool { static Random rand = new Random(); public static int getInterval(int max){ return rand.nextInt(max); }}
Java Netty (2)
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