Netty4入门（二）

/**
 * 
 */
package com.a;

/**
 *
 */
public class Constant {
	
	public final static int HEADER_FLAG = 123456789;
	
}

/**
 * 
 */
package com.a;

/**
 * 请求消息
 */
public class RequestMsg {
	
	private int module;
	private int cmd;
	private byte[] data;
	
	public int getModule() {
		return module;
	}
	public void setModule(int module) {
		this.module = module;
	}
	public int getCmd() {
		return cmd;
	}
	public void setCmd(int cmd) {
		this.cmd = cmd;
	}
	public byte[] getData() {
		return data;
	}
	public void setData(byte[] data) {
		this.data = data;
	}
	
}

/**
 * 
 */
package com.a;

/**
 * 返回消息
 */
public class ResponseMsg {
	
	private int module;
	private int cmd;
	private int code;
	private byte[] data;
	
	public int getModule() {
		return module;
	}
	public void setModule(int module) {
		this.module = module;
	}
	public int getCmd() {
		return cmd;
	}
	public void setCmd(int cmd) {
		this.cmd = cmd;
	}
	public int getCode() {
		return code;
	}
	public void setCode(int code) {
		this.code = code;
	}
	public byte[] getData() {
		return data;
	}
	public void setData(byte[] data) {
		this.data = data;
	}
	
}

服务程序

/**
 * 
 */
package com.a.server;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;

/**
 *
 */
public class Server {
	
	public static void main(String[] args) throws Exception {
		
		ServerBootstrap server = new ServerBootstrap();
		
		EventLoopGroup parentGroup = new NioEventLoopGroup();
		EventLoopGroup childGroup = new NioEventLoopGroup();
		server.group(parentGroup, childGroup);
		
		server.channel(NioServerSocketChannel.class);
		
		server.childHandler(new ChannelInitializer() {
			@Override
			public void initChannel(SocketChannel ch) throws Exception {
				//接受消息解码
				ch.pipeline().addLast(new RequestDecoder());
				//消息处理
				ch.pipeline().addLast(new ZukServerHandler());
				//返回消息编码
				ch.pipeline().addLast(new ZukServerResponseEncoder());
				
			}
		});
	
		server.option(ChannelOption.SO_BACKLOG, 2048);// 链接缓冲池队列大小
		server.bind(10102).sync();
		
	}

}

/**
 * 
 */
package com.a.server;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

import com.a.Constant;
import com.a.RequestMsg;

/**
 * 解码请求消息
 */
public class RequestDecoder extends ByteToMessageDecoder{
	
	/***
	 * +-----------------------------------------------------------
	 * | 包头(int)4 | 模块(int)4  | 命令(int)4  | 数据长度(int)4  | ......
	 * +-----------------------------------------------------------
	 */
	public static int BASE_LENTH = 4 + 4 + 4 + 4;

	@Override
	protected void decode(ChannelHandlerContext ctx, ByteBuf buffer, List