经过上几次的粗略讲解，相信大家对netty有了基本的了解，这次通过实例来详细了解下它是怎么运行的吧。
1、创建Client.java
package com.yxq.test;
import io.netty.bootstrap.Bootstrap;
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;
public class Client
{
public static void main(String[] args) throws Exception
{
EventLoopGroup workgroup = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
b.group(workgroup)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer < SocketChannel > ()
{
@Override
protected void initChannel(SocketChannel sc) throws Exception
{
sc.pipeline()
.addLast(new ClientHandler());
}
});
ChannelFuture cf1 = b.connect("127.0.0.1", 8765)
.sync();
//buf
cf1.channel()
.writeAndFlush(Unpooled.copiedBuffer("777".getBytes()));
cf1.channel()
.closeFuture()
.sync();
workgroup.shutdownGracefully();
}
}2、ClientHandler.java
package com.yxq.test;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.ReferenceCountUtil;
public class ClientHandler extends ChannelHandlerAdapter
{
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
{
try
{
//do something msg
ByteBuf buf = (ByteBuf) msg;
byte[] data = new byte[buf.readableBytes()];
buf.readBytes(data);
String request = new String(data, "utf-8");
System.out.println("Client: " + request);
}
finally
{
ReferenceCountUtil.release(msg);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception
{
cause.printStackTrace();
ctx.close();
}
}3、Server.java
package com.yxq.test;
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 Server
{
public static void main(String[] args) throws Exception
{
//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操作的
EventLoopGroup workerGroup = new NioEventLoopGroup();
//3 创建一个辅助类Bootstrap，就是对我们的Server进行一系列的配置
ServerBootstrap b = new ServerBootstrap();
//把俩个工作线程组加入进来
b.group(bossGroup, workerGroup)
//我要指定使用NioServerSocketChannel这种类型的通道
.channel(NioServerSocketChannel.class)
//一定要使用 childHandler 去绑定具体的 事件处理器
.childHandler(new ChannelInitializer < SocketChannel > ()
{
@Override
protected void initChannel(SocketChannel sc) throws Exception
{
sc.pipeline()
.addLast(new ServerHandler());
}
});
//绑定指定的端口 进行监听
ChannelFuture f = b.bind(8765)
.sync();
//Thread.sleep(1000000);
f.channel()
.closeFuture()
.sync();
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}4、ServerHandler.java
package com.yxq.test;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.ReferenceCountUtil;
public class ServerHandler extends ChannelHandlerAdapter
{
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
{
//do something msg
ByteBuf buf = (ByteBuf) msg;
byte[] data = new byte[buf.readableBytes()];
buf.readBytes(data);
String request = new String(data, "utf-8");
System.out.println("Server: " + request);
//写给客户端
String response = "我是反馈的信息";
ctx.writeAndFlush(Unpooled.copiedBuffer("888".getBytes()));
//.addListener(ChannelFutureListener.CLOSE);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception
{
cause.printStackTrace();
ctx.close();
}
}最后打印：
先开启server端，再启client端
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