使用netty4 和 protobuf2.6.1进行网络通信

test.proto文件

package protobuf; 
option java_package = "com.test.protobuf"; 
option java_outer_classname = "FirstProtobuf"; 
message testBuf {
  required int32 ID = 1; 
  required string Url = 2; 
}

Server端代码：

package com.test.server;

import com.sun.istack.internal.logging.Logger;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
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 io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

public class TimeServer {
	private static final Logger logger = Logger.getLogger(TimeServer.class);
	private static final String IP = "127.0.0.1";
	private static final int PORT = 9999;
	/** 用于分配处理业务线程的线程组个数 */
	protected static final int BIZGROUPSIZE = Runtime.getRuntime()
			.availableProcessors() * 2; // 默认
	/** 业务出现线程大小 */
	protected static final int BIZTHREADSIZE = 4;
	private static final EventLoopGroup bossGroup = new NioEventLoopGroup(
			BIZGROUPSIZE);
	private static final EventLoopGroup workerGroup = new NioEventLoopGroup(
			BIZTHREADSIZE);

	protected static void run() throws Exception {
		ServerBootstrap b = new ServerBootstrap();
		b.group(bossGroup, workerGroup);
		b.channel(NioServerSocketChannel.class);
		b.childHandler(new TimeServerInitializer());

		b.bind(IP, PORT).sync();
		logger.info("TCP服务器已启动");
	}

	protected static void shutdown() {
		workerGroup.shutdownGracefully();
		bossGroup.shutdownGracefully();
	}

	public static void main(String[] args) throws Exception {
		logger.info("开始启动TCP服务器...");
		TimeServer.run();
		// TcpServer.shutdown();
	}
}

server Initializer

package com.test.server;

import com.test.protobuf.FirstProtobuf;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

public class TimeServerInitializer extends ChannelInitializer<SocketChannel>{

	@Override
	protected void initChannel(SocketChannel ch) throws Exception {
		ChannelPipeline pipeline = ch.pipeline();
		pipeline.addLast("frameDecoder",
				new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0,
						4, 0, 4));
		pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
		pipeline.addLast("encoder",new ProtobufEncoder());
		pipeline.addLast("decoder", new ProtobufDecoder(FirstProtobuf.testBuf.getDefaultInstance()));
		 pipeline.addLast(new TimeServerHandler());
	}

}

server handler:

package com.test.server;

import java.util.Date;

import com.sun.istack.internal.logging.Logger;
import com.test.protobuf.FirstProtobuf;
import com.test.protobuf.FirstProtobuf.testBuf;

import sun.awt.im.SimpleInputMethodWindow;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.ChannelHandler.Sharable;

@Sharable
public class TimeServerHandler extends SimpleChannelInboundHandler<FirstProtobuf.testBuf>{
	//private int counter;
	private static final Logger logger = Logger.getLogger(TimeServerHandler.class);


	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
			throws Exception {
		//cause.printStackTrace();
		ctx.close();
	}

	@Override
	protected void channelRead0(ChannelHandlerContext ctx, testBuf msg)
			throws Exception {
		
		System.out.println("server:" + "channelRead:" + msg.getUrl());

		FirstProtobuf.testBuf.Builder builder = FirstProtobuf.testBuf.newBuilder();

		builder.setID(1);
		builder.setUrl("welcome");

		ctx.writeAndFlush(builder.build());
	}

	

}

Client端代码：

package com.test.client;

import com.sun.istack.internal.logging.Logger;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

public class TimeClient {
	private static final Logger logger = Logger.getLogger(TimeClient.class);
	public static String HOST = "127.0.0.1";
	public static int PORT = 9999;

	//public static Bootstrap bootstrap = getBootstrap();
	//public static Channel channel = getChannel(HOST, PORT);

	/**
	 * 初始化Bootstrap
	 * 
	 * @return
	 * @throws InterruptedException 
	 */
	public void run() throws InterruptedException {
		EventLoopGroup group = new NioEventLoopGroup();
		Bootstrap b = new Bootstrap();
		b.group(group).channel(NioSocketChannel.class);
		b.handler(new TimeClientInitializer());
		//b.option(ChannelOption.SO_KEEPALIVE, true);
		b.connect(HOST, PORT).sync();
	}


	public static void main(String[] args) throws Exception {
		new TimeClient().run();
	}
}

client Initializer

package com.test.client;



import com.test.protobuf.FirstProtobuf;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

public class TimeClientInitializer extends ChannelInitializer<SocketChannel>{

	@Override
	protected void initChannel(SocketChannel ch) throws Exception {
		ChannelPipeline pipeline = ch.pipeline();
		pipeline.addLast("frameDecoder",
				new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0,
						4, 0, 4));
		pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
		pipeline.addLast("encoder",new ProtobufEncoder());
		pipeline.addLast("decoder", new ProtobufDecoder(FirstProtobuf.testBuf.getDefaultInstance()));
		 pipeline.addLast(new TimeClientHandler());
		
	}

}

client handler：

package com.test.client;

import com.sun.istack.internal.logging.Logger;
import com.test.protobuf.FirstProtobuf;
import com.test.protobuf.FirstProtobuf.testBuf;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.SimpleChannelInboundHandler;

public class TimeClientHandler extends SimpleChannelInboundHandler<FirstProtobuf.testBuf>{
  private static final Logger logger = Logger.getLogger(TimeClientHandler.class);
  private int counter;
  private FirstProtobuf.testBuf.Builder builder = FirstProtobuf.testBuf.newBuilder();
	public TimeClientHandler(){
		builder.setID(1);
		builder.setUrl("www.baidu.com");
	}
	
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		//ByteBuf message = null;
		for(int i = 0;i<100;i++){
			ctx.channel().writeAndFlush(builder.build());
		}
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
			throws Exception {
		logger.warning("Unexpected exception from downstream:"+
				cause.getMessage());
		ctx.close();
	}

	/*@Override
	protected void channelRead0(ChannelHandlerContext ctx, Object msg)
			throws Exception {
		String body = (String) msg;
		System.out.println("Now is:"+body+";the counter is :"
				+ ++counter);
		
	}*/

	@Override
	protected void channelRead0(ChannelHandlerContext ctx, testBuf msg)
			throws Exception {
		System.out.println(msg.getID()+" "+msg.getUrl());
	}

}