JAVA Netty例子

package 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;

public class NettyServer {
public void bind(int port){
EventLoopGroup bossGroup = new NioEventLoopGroup() ;
EventLoopGroup workGroup = new NioEventLoopGroup() ;
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup,workGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 1024)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel socketChannel) throws Exception {
socketChannel.pipeline().addLast(new NettyServerHandle());
}
});
ChannelFuture f = b.bind(port).sync();
f.channel().closeFuture().sync();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
bossGroup.shutdownGracefully();
workGroup.shutdownGracefully();
}

}

public static void main(String[] args) {
new NettyServer().bind(1986);
}
}

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

public class NettyServerHandle 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("receive : " + body);

String send = body + "2";
ByteBuf sendBuf = Unpooled.copiedBuffer(send.getBytes());
ctx.write(sendBuf);
}

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

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

package 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;

public class NettyClient {
public void connect(int port,String host){
EventLoopGroup workGroup = new NioEventLoopGroup() ;
try {
Bootstrap b = new Bootstrap();
b.group(workGroup)
.channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true);
b.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel socketChannel) throws Exception {
socketChannel.pipeline().addLast(new NettyClientHandle());
}
});
ChannelFuture f = b.connect(host, port).sync();
f.channel().closeFuture().sync();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
workGroup.shutdownGracefully();
}

}

public static void main(String[] args) {
new NettyClient().connect(1986,"127.0.0.1");
}
}

package netty;

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

import java.io.UnsupportedEncodingException;

public class NettyClientHandle extends ChannelHandlerAdapter {

private ByteBuf clientBuf;

public NettyClientHandle() {
String send = null;
try {
send = new String("1".getBytes(),"UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
System.out.println("client init: " + send);
clientBuf = Unpooled.buffer(send.getBytes().length);
clientBuf.writeBytes(send.getBytes());
}

@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
ByteBuf buf = (ByteBuf)msg;
byte[] req = new byte[buf.readableBytes()];
buf.readBytes(req); // 加上这句，可以避免乱码
String body = new String(req,"UTF-8");
System.out.println("now is : " + body);
}

@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println("client send ");
ctx.writeAndFlush(clientBuf);
}

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