netty入门代码学习

package com.lsp.netty;

/**
* @author lishupeng
* @create 2017-05-27 下午 3:48
**/
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
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;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

public class Socket {
public static void main(String[] args) throws InterruptedException {
//1.第一个线程组是用于接收Client端连接的
EventLoopGroup bossGroup = new NioEventLoopGroup();
//2.第二个线程组是用于实际的业务处理的
EventLoopGroup workerGroup = new NioEventLoopGroup();
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup);//绑定两个线程池
b.channel(NioServerSocketChannel.class);//指定NIO的模式，如果是客户端就是NioSocketChannel
b.option(ChannelOption.SO_BACKLOG, 1024);//TCP的缓冲区设置
b.option(ChannelOption.SO_SNDBUF, 32*1024);//设置发送缓冲的大小
b.option(ChannelOption.SO_RCVBUF, 32*1024);//设置接收缓冲区大小
b.option(ChannelOption.SO_KEEPALIVE, true);//保持连续
b.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel sc) throws Exception {
ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());//拆包粘包定义结束字符串（第一种解决方案）
sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,buf));//在管道中加入结束字符串
//  sc.pipeline().addLast(new FixedLengthFrameDecoder(200));第二种定长
sc.pipeline().addLast(new StringDecoder());//定义接收类型为字符串把ByteBuf转成String
sc.pipeline().addLast(new ServertHandler());//在这里配置具体数据接收方法的处理
}
});
ChannelFuture future = b.bind(8765).sync();//绑定端口
future.channel().closeFuture().sync();//等待关闭(程序阻塞在这里等待客户端请求)
bossGroup.shutdownGracefully();//关闭线程
workerGroup.shutdownGracefully();//关闭线程
}
}

package com.lsp.netty;

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

/**
* @author lishupeng
* @create 2017-05-27 下午 3:48
**/
public class ServertHandler extends ChannelHandlerAdapter {

@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
String body = (String) msg;
System.out.println("server"+body);//前面已经定义了接收为字符串，这里直接接收字符串就可以
//服务端给客户端的响应
String response= " hi client!$_";//发送的数据以定义结束的字符串结尾
ctx.writeAndFlush(Unpooled.copiedBuffer(response.getBytes()));//发送必须还是ByteBuf类型
}

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

}

package com.lsp.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

/**
* @author lishupeng
* @create 2017-05-27 下午 3:48
**/
public class Client {
public static void main(String[] args) throws InterruptedException {
EventLoopGroup worker = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
b.group(worker)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel sc) throws Exception {
ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());
sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,buf));
sc.pipeline().addLast(new StringDecoder());
sc.pipeline().addLast(new ClientHandler());
}
});
ChannelFuture f=b.connect("127.0.0.1",8765).sync();
f.channel().writeAndFlush(Unpooled.copiedBuffer(" hi server2$_".getBytes()));
f.channel().writeAndFlush(Unpooled.copiedBuffer(" hi server3$_".getBytes()));
f.channel().writeAndFlush(Unpooled.copiedBuffer(" hi server4$_".getBytes()));
f.channel().closeFuture().sync();
worker.shutdownGracefully();
}

}

package com.lsp.netty;

import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.ReferenceCountUtil;

/**
* @author lishupeng
* @create 2017-05-27 下午 3:49
**/
public class ClientHandler extends ChannelHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
try {
System.out.println("client"+msg.toString());
} finally {
ReferenceCountUtil.release(msg);//释放缓冲区
}
}

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