netty time 例子
//TIME 服务器端协议实现
package com.bigdata.jboss.basic;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
public class TimeServerHandler extends SimpleChannelHandler{
@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
throws Exception {
Channel channel = e.getChannel();
ChannelBuffer buffer = ChannelBuffers.buffer(4);
buffer.writeInt((int) (System.currentTimeMillis()/1000));
ChannelFuture future = channel.write(buffer);
future.addListener(new ChannelFutureListener() {
public void operationComplete(ChannelFuture future) throws Exception {
future.getChannel().close();
}
});
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
throws Exception {
e.getCause().printStackTrace();
e.getChannel().close();
}
}
1.channelConnected 方法，当连接已经建立后，会调用。会返回给客户端以秒显示的整数
2.ChannelBuffers是一个帮助类(非常有用），buffer方法会近回4字节的ChannelBuffer实例。
3.Channel的write方法会返回ChannelFuture实例，ChannelFuture实例会等待客户端接收到数据后，然后关闭连接。
4.获得客户端读取完数据的通知，是通过给ChannelFuture添加ChannelFutureListener实例，来获得客户端读取完成的时 机。也可以简化注册监听f.addListener(ChannelFutureListener.CLOSE);
//TIME 服务器
package com.bigdata.jboss.basic;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
public class TimeServer {
public static void main(String[] args) {
ChannelFactory factory = new NioServerSocketChannelFactory(Executors.newCachedThreadPool(),Executors.newCachedThreadPool());
ServerBootstrap bootstrap = new ServerBootstrap(factory);
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new TimeServerHandler());
}
});
bootstrap.setOption("child.tcpNoDelay", true);
bootstrap.setOption("child.keepAlive", true);
bootstrap.bind(new InetSocketAddress(8080));
System.out.println("Time Server started");
}
}
//TIME 客户端协议实现
package com.bigdata.jboss.basic;
import java.util.Date;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
public class TimeClientHandler extends SimpleChannelHandler {
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
throws Exception {
ChannelBuffer buffer = (ChannelBuffer) e.getMessage();
long date = buffer.readInt()*1000L;
e.getChannel().close();
System.out.println(new Date(date));
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
throws Exception {
e.getCause().printStackTrace();
e.getChannel().close();
}
}
//TIME 客户端
package com.bigdata.jboss.basic;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
public class TimeClient {
public static void main(String[] args) {
String host = args[0];
int port = Integer.parseInt(args[1]);
ChannelFactory factory = new NioClientSocketChannelFactory(
Executors.newCachedThreadPool(),
Executors.newCachedThreadPool());
ClientBootstrap bootstrap = new ClientBootstrap(factory);
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new TimeClientHandler());
}
});
bootstrap.setOption("tcpNoDelay", true);
bootstrap.setOption("keepAlive", true);
ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));
future.awaitUninterruptibly();
if(false == future.isSuccess()){
future.getCause().printStackTrace();
}
future.getChannel().getCloseFuture().awaitUninterruptibly();
factory.releaseExternalResources();
}
}
1.NioClientSocketChannelFactory是客户端的ChannelFactory类。
2.ClientBootStrapo是客户端的BootStrap。
3.客户端TCP/IP参数无"child."前缀。
4.使用connect连接服务器。
5.ClientBootstrap返回一个ChannelFuture，指明当连接成功或失败。
6.等待连接尝试是否成功或失败。
7.如果失败，会输出异常信息。
8.等待closeFuture，连接使用完成。
9.ChannelFactory释放所有资源，如线程池等。
//客户端增强
原因：以流传输的TCP/IP,OS的Receive Buffer Queue不是以包来缓存，而是缓存bytes,当Traffic比较大的时候，会造成取的Frames不完整，需要判断接收到的数据是否完整。
//TIME Decoder
package com.bigdata.jboss.basic;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.frame.FrameDecoder;
public class TimeDecoder extends FrameDecoder{
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel,
ChannelBuffer buffer) throws Exception {
Object result = null;
if(buffer.readableBytes() < 4){
result = null;
}else{
result = buffer.readBytes(4);
}
return result;
}
}
package com.bigdata.jboss.basic;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
public class TimeClientImprovment {
public static void main(String[] args) {
String host = args[0];
int port = Integer.parseInt(args[1]);
ChannelFactory factory = new NioClientSocketChannelFactory(
Executors.newCachedThreadPool(),
Executors.newCachedThreadPool());
ClientBootstrap bootstrap = new ClientBootstrap(factory);
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {// improment
return Channels.pipeline(new TimeDecoder(), new TimeClientHandler());
}
});
bootstrap.setOption("tcpNoDelay", true);
bootstrap.setOption("keepAlive", true);
ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));
future.awaitUninterruptibly();
if(false == future.isSuccess()){
future.getCause().printStackTrace();
}
future.getChannel().getCloseFuture().awaitUninterruptibly();
factory.releaseExternalResources();
}
}
//传递POJO信息
package com.bigdata.jboss.basic;
import java.util.Date;
public class UnixTime {
private final int value;
public UnixTime(int value) {
super();
this.value = value;
}
public int getValue() {
return value;
}
@Override
public String toString() {
return new Date(value*1000L).toString();
}
}
package com.bigdata.jboss.basic;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
public class TimeServerHandler extends SimpleChannelHandler{
@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
throws Exception {
Channel channel = e.getChannel();
ChannelBuffer buffer = ChannelBuffers.buffer(4);
buffer.writeInt((int) (System.currentTimeMillis()/1000));
ChannelFuture future = channel.write(buffer);
future.addListener(new ChannelFutureListener() {
public void operationComplete(ChannelFuture future) throws Exception {
future.getChannel().close();
}
});
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
throws Exception {
e.getCause().printStackTrace();
e.getChannel().close();
}
}
package com.bigdata.jboss.basic;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
public class UnixTimeEncoder extends SimpleChannelHandler{
@Override
public void writeRequested(ChannelHandlerContext ctx, MessageEvent e)
throws Exception {
ChannelBuffer buffer = ChannelBuffers.buffer(4);
UnixTime unixTime = (UnixTime) e.getMessage();
buffer.writeInt(unixTime.getValue());
Channels.write(ctx, e.getFuture(),buffer);
}
}
package com.bigdata.jboss.basic;
import java.net.InetSocketAddress;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
public class UnixTimeServer {
/**
* @param args
*/
public static void main(String[] args) {
ChannelFactory factory = new NioServerSocketChannelFactory(Executors.newCachedThreadPool(),Executors.newCachedThreadPool());
ServerBootstrap bootstrap = new ServerBootstrap(factory);
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new UnixTimeServerHandler(),new UnixTimeEncoder());
}
});
bootstrap.setOption("child.tcpNoDelay",true);
bootstrap.setOption("child.keepAlive",true);
bootstrap.bind(new InetSocketAddress(8080));
System.out.println("UnixTime Server started");
}
}
package com.bigdata.jboss.basic;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
public class UnixTimeClientHandler extends SimpleChannelHandler{
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
throws Exception {
UnixTime unixTime = (UnixTime) e.getMessage();
e.getChannel().close();
System.out.println(unixTime);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
throws Exception {
e.getCause().printStackTrace();
e.getChannel().close();
}
}
package com.bigdata.jboss.basic;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.frame.FrameDecoder;
public class UnixTimeClientDecoder extends FrameDecoder{
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel,
ChannelBuffer buffer) throws Exception {
UnixTime result = null;
if(buffer.readableBytes() >= 4){
result = new UnixTime(buffer.readInt());
}
return result;
}
}
package com.bigdata.jboss.basic;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
public class UnixTimeClient {
public static void main(String[] args) {
String host = args[0];
int port = Integer.parseInt(args[1]);
ChannelFactory factory = new NioClientSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
ClientBootstrap bootstrap = new ClientBootstrap(factory);
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new UnixTimeClientDecoder(),new UnixTimeClientHandler());
}
});
bootstrap.setOption("tcpNoDelay", true);
bootstrap.setOption("keepAlive",true);
ChannelFuture future =bootstrap.connect(new InetSocketAddress(host, port));
future.awaitUninterruptibly();
if(false == future.isSuccess()){
future.getCause().printStackTrace();
}
future.getChannel().getCloseFuture().awaitUninterruptibly();
factory.releaseExternalResources();
}
}