Develop
2015.01.02 18:32
[java] netty (비동기 이벤트 방식 네트워크 프레임워크) 사용법 #2 (client)
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바로 이어서 client 로직을 올려 봅니다.
여기도 2개의 클래스 입니다.
첫 번째로 이벤트 핸들러 클래스 입니다.
package com.incross.netty; 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.MessageEvent; import org.jboss.netty.channel.SimpleChannelHandler; public class SimpleClientHandler extends SimpleChannelHandler { @Override public void messageReceived(ChannelHandlerContext ctx,MessageEvent e) { ChannelBuffer response = (ChannelBuffer)e.getMessage(); byte[] message = response.array(); System.out.println("message:"+new String(message)); //response 메시지 찍어보기 if(new String(message).equals("server write test")) { //어떤 조건이 들어왔을 때 종료 되는 로직 Channel ch = e.getChannel(); ch.close(); System.out.println("closed"); } } //connection 연결 하면 바로 데이터 전송 하도록 하는 메소드 @Override public void channelConnected(ChannelHandlerContext ctx,ChannelStateEvent e) { Channel ch = e.getChannel(); ChannelBuffer buf = ChannelBuffers.dynamicBuffer(); buf.writeBytes("1234a".getBytes()); ChannelFuture future = ch.write(buf); future.addListener(new ChannelFutureListener() { public void operationComplete(ChannelFuture future) { Channel ch = future.getChannel(); //ch.close(); //보내고 응답 안받고 끝내려면 close 해주면 됨 } }); } public void exceptionCaught(ChannelHandlerContext ctx,ExceptionEvent e) { e.getCause().printStackTrace(); Channel ch = e.getChannel(); ch.close(); } }
두 번째로 클라이언트 쪽의 main 클래스 입니다.
package com.incross.netty; 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 SimpleClient { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int port = 8000; ChannelFactory factory = new NioClientSocketChannelFactory( Executors.newCachedThreadPool(), Executors.newCachedThreadPool() ); ClientBootstrap bootstrap = new ClientBootstrap(factory); bootstrap.setPipelineFactory(new ChannelPipelineFactory() { @Override public ChannelPipeline getPipeline() throws Exception { // TODO Auto-generated method stub return Channels.pipeline(new SimpleClientHandler()); } }); bootstrap.setOption("tcpNoDelay", true); bootstrap.setOption("keepAlive", true); ChannelFuture future = bootstrap.connect(new InetSocketAddress("localhost",port)); // 아래 부터는 connection 끊어 졌을 때를 위한 처리 future.awaitUninterruptibly(); if(!future.isSuccess()) { future.getCause().printStackTrace(); } future.getChannel().getCloseFuture().awaitUninterruptibly(); factory.releaseExternalResources(); //connection 끊어졌을 때 자원 회수 } }
[출처] http://shonm.tistory.com/398
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