Netty入门应用

一.架包下载地址

http://download.csdn.net/detail/dfdsggdgg/9500283

二.服务端类

package com.phei.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
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;
/**
 * 服务端
 * @author renhj
 *
 */
public class TimeServer {

	public void bind(int port) throws Exception{
		
		//第一个用户服务器接收客户端的连接
		EventLoopGroup bossGroup = new NioEventLoopGroup();
		//第二个用户SocketChannel的网络读写
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try{
         //创建ServerBootstrap对象，启动 NIO服务端的辅助启动类
      	 ServerBootstrap b = new ServerBootstrap();
      	 b.group(bossGroup, workerGroup).
      	 //设置为NIO
      	 channel(NioServerSocketChannel.class)
      	 .option(ChannelOption.SO_BACKLOG, 1024)
      	 .childHandler(new ChildChannelHandler());
      	  
      	 //绑定端口，同步等待成功
      	 ChannelFuture f = b.bind(port).sync();
      	 
         //等待服务器监听端口关闭
      	 f.channel().closeFuture().sync();
      	 
        }finally{
      	 //释放线程池资源
         bossGroup.shutdownGracefully();
         workerGroup.shutdownGracefully();
        }
		
	}
	
	private class ChildChannelHandler extends ChannelInitializer<SocketChannel>{
		
		@Override
		protected void initChannel(SocketChannel arg0) throws Exception {
			
			arg0.pipeline().addLast(new TimeServerHandler());
			
		}
	}
	
	public static void main(String[] args) throws Exception {
		
		int port = 8080;
		if(args != null && args.length>0){
			try{
				port = Integer.valueOf(args[0]);
			}catch(Exception e){
				//采用默认值
			}
		}
		new TimeServer().bind(port);
	}

}

二.服务端核心处理类

</pre><pre code_snippet_id="1659008" snippet_file_name="blog_20160423_2_7576545" name="code" class="html">package com.phei.netty;

import java.util.Date;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
/**
 * 服务端核心处理类
 * @author renhj
 *
 */
public class TimeServerHandler extends ChannelHandlerAdapter {

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		
		ByteBuf buf = (ByteBuf)msg;
		byte[] req = new byte[buf.readableBytes()];
		buf.readBytes(req);
		String body = new String(req,"UTF-8");
		System.out.println("The time server receive order ："+ body);
		String currentTime = "QUERY TIME ORDER".equalsIgnoreCase(body)?
				new Date(System.currentTimeMillis()).toString():"BAD ORDER";
	    ByteBuf resp = Unpooled.copiedBuffer(currentTime.getBytes());
	    ctx.write(resp);
	}

	@Override
	public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
		ctx.flush();
	}

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

	

	
	
}

三.客户端类

package com.phei.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
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.NioSocketChannel;

/**
 * 客服端
 * @author renhj
 *
 */

public class TimeClient {

	public void connect(int port , String host) throws Exception{
		
		//配置客户端NIO线程组
		EventLoopGroup group = new NioEventLoopGroup();
		try{
			Bootstrap b = new Bootstrap();
			b.group(group).channel(NioSocketChannel.class)
			.option(ChannelOption.TCP_NODELAY, true)
			.handler(new ChannelInitializer<SocketChannel>(){
				
				@Override
				public void initChannel(SocketChannel ch) throws Exception{
					ch.pipeline().addLast(new TimeClientHandler());
				}
			});
		//发起异步连接操作
	    ChannelFuture f = b.connect(host, port).sync();
			
	    //等待客户端链路关闭
	    f.channel().closeFuture().sync();
			
		}finally{
	    //释放NIO线程
		group.shutdownGracefully();
		}
				
	}
	public static void main(String[] args) throws Exception{
		
		int port = 8080;
		if(args !=null && args.length>0){
			try{
				port = Integer.valueOf(args[0]);				
			}catch(Exception e){
				
			}
		}
		new TimeClient().connect(port, "127.0.0.1");
	}
}

四：客户端核心处理类

package com.phei.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

/**
 * 客户端核心处理类
 * @author renhj
 *
 */
public class TimeClientHandler extends ChannelHandlerAdapter {

	private final ByteBuf firstMessage;
	
	public TimeClientHandler(){
		byte[] req  = "QUERY TIME ORDER".getBytes();
		firstMessage = Unpooled.buffer(req.length);
		firstMessage.writeBytes(req);
	}
	
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		ctx.writeAndFlush(firstMessage);
	}

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		
		ByteBuf buf = (ByteBuf)msg;
		byte[] req = new byte[buf.readableBytes()]; 
		buf.readBytes(req);
		String body = new String(req,"UTF-8");
		System.out.println("Now is : "+body);
		
	}

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

	 
}

五.运行结果