Netty笔记二(发送对象--服务端客户端附可运行源码)

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netty客户端服务端同时被 3 个专栏收录

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本文介绍了一个使用Netty框架实现对象在网络中传输的例子。通过客户端和服务端的交互，展示了如何利用ObjectEncoder和ObjectDecoder完成Java对象的序列化与反序列化过程。

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网络传输的时候采用的是流的形式，所以一个对象要发出去，并且在服务端要收到一个完整的对象，就要相应的编码解码的过程，这个例子向您展示netty的ObjectEncoder和ObjectDecoder编码解码的过程，代码写的比较简单而且注释比较多就直接用代码了

Server 服务器端的启动程序

package com.my.day2;

import java.net.InetSocketAddress;
import java.util.concurrent.Executors;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;


/**   
 * @Title: Server.java 
 * @Package com.my.day2 
 * @Description: TODO
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-22 下午8:06:41 
 */
public class Server {
	public void run(){
		NioServerSocketChannelFactory channelFactory = new NioServerSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
		ServerBootstrap bootstrap = new ServerBootstrap(channelFactory);
		bootstrap.setPipelineFactory(new ServerChannelPipelineFactory());
		bootstrap.setOption("tcpNoDelay", true);
		bootstrap.setOption("keepAlive", true);
		bootstrap.bind(new InetSocketAddress(8080));
	}
}

ServerChannelPipelineFactory

package com.my.day2;

import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.handler.codec.serialization.ClassResolvers;
import org.jboss.netty.handler.codec.serialization.ObjectDecoder;

/**   
 * @Title: MyChannelFactory.java 
 * @Package com.my.day2 
 * @Description: 自定义ChannelPipelineFactory
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-22 下午8:08:35 
 */
public class ServerChannelPipelineFactory implements ChannelPipelineFactory{

	@Override
	public ChannelPipeline getPipeline() throws Exception {
		
		ChannelPipeline channelPipeline = Channels.pipeline();
		/**
		 *  往流水线里添加任务，这里写netty聊天的时候主要的协议解析和逻辑处理
		 *  例如1.我要对我传送的内容进行加密解密
		 *  2.我要确定每次客户端传送给服务端的内容是多少
		 *  3.我要对根究客户端发送的内容确定调用哪端业务逻辑
		 *  4.netty框架本身自带了很多Encode和DeCode
		 */
		channelPipeline.addLast("objectDecode", new ObjectDecoder(ClassResolvers.cacheDisabled(this.getClass().getClassLoader())));
		channelPipeline.addLast("myhandler", new ServerHandler());
		return channelPipeline;
	}
}

ServerHandler

package com.my.day2;

import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;

/**   
 * @Title: ServerHandler.java 
 * @Package com.my.day2 
 * @Description: TODO
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-22 下午8:50:46 
 */
public class ServerHandler extends SimpleChannelUpstreamHandler{

	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {
		User user = (User) e.getMessage();
		System.out.println("form client...." + user.getName());
		super.messageReceived(ctx, e);
	}

	@Override
	public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		System.out.println("服务器端进来一个连接");
		super.channelConnected(ctx, e);
	}
	
	
}

Client

package com.my.day2;

import java.net.InetSocketAddress;
import java.util.concurrent.Executors;

import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;

/**   
 * @Title: Client.java 
 * @Package com.my.day2 
 * @Description: TODO
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-22 下午8:57:02 
 */
public class Client {
	public void run(){
		ClientBootstrap bootstap = new ClientBootstrap();
		NioClientSocketChannelFactory channelFactory = new NioClientSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
		bootstap.setFactory(channelFactory);
		bootstap.setPipelineFactory(new ClientChannelPipelineFactory());
		bootstap.setOption("tcpNoDelay", true);
		bootstap.setOption("keepAlive", true);
		ChannelFuture future = bootstap.connect(new InetSocketAddress(8080));
		User user = new User();
		user.setName("xuehan");
		user.setPassword("maybe");
		future.getChannel().write(user);
		
	}
}

ClientChannelPipelineFactory

package com.my.day2;


import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.handler.codec.serialization.ObjectEncoder;

/**   
 * @Title: MyChannelFactory.java 
 * @Package com.my.day2 
 * @Description: 自定义ChannelPipelineFactory
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-22 下午8:08:35 
 */
public class ClientChannelPipelineFactory implements ChannelPipelineFactory{

	@Override
	public ChannelPipeline getPipeline() throws Exception {
		
		ChannelPipeline channelPipeline = Channels.pipeline();
		/**
		 *  往流水线里添加任务，这里写netty聊天的时候主要的协议解析和逻辑处理
		 *  例如1.我要对我传送的内容进行加密解密
		 *  2.我要确定每次客户端传送给服务端的内容是多少
		 *  3.我要对根究客户端发送的内容确定调用哪端业务逻辑
		 *  4.netty框架本身自带了很多Encode和DeCode
		 */
		channelPipeline.addLast("objectEncode", new ObjectEncoder());
		channelPipeline.addLast("myhandler", new ClientHandler());
		return channelPipeline;
	}
}

测试类TestServer

package com.my.day2;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelDownstreamHandler;

/**   
 * @Title: ClientHandler.java 
 * @Package com.my.day2 
 * @Description: TODO
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-22 下午9:02:50 
 */
public class ClientHandler extends SimpleChannelDownstreamHandler{

	@Override
	public void writeRequested(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {
		super.writeRequested(ctx, e);
	}
	

	@Override
	public void bindRequested(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		// TODO Auto-generated method stub
		super.bindRequested(ctx, e);
	}


	@Override
	public void connectRequested(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		System.out.println("客户端请求连接");
		super.connectRequested(ctx, e);
	}
	
	
}

测试类TestServer

package com.my.day2;
/**   
 * @Title: Test.java 
 * @Package com.my.day2 
 * @Description: TODO
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-22 下午9:05:02 
 */
public class TestServer {
	public static void main(String[] args) throws InterruptedException {
		Server server = new Server();
		server.run();
		Thread.sleep(1000);
		Client client = new Client();
		client.run();
	}
}

User

package com.my.day2;

import java.io.Serializable;

/**   
 * @Title: User.java 
 * @Package com.my.day2 
 * @Description: 用于网络传输的对象必须序列化否则无法传送
 * @author jimmy lovelyxuehanxin@163.com   
 * @date 2013-4-23 下午8:41:59 
 */
public class User implements Serializable{
	private static final long serialVersionUID = -7198306226394014411L;
	private String name;
	private String password;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	
}

这是一个完整的例子用的netty的maven配置文件是

<dependency>
      <groupId>io.netty</groupId>
      <artifactId>netty</artifactId>
      <version>3.5.6.Final</version>
 </dependency>

附件是可以运行代码，依赖jar文件请读者自己去下载

day2.zip (5.9 KB)
下载次数: 69