Apache MINA实战之 对象传输

本文链接：http://blog.csdn.net/kongxx/article/details/7520599

利用Apache MINA来传递对象，这对了MINA来说非常容易，并且这也是Java网络编程中很常用的应用。其实对于MINA传递对象来说，如果看过前一篇文章的话，只要在其中做少许改动就可以实现对象传递，但这里考虑到例子的完整性，还是给出了全部代码示例。

首先看两个用来传递的Java对象MyRequestObject和MyResponseObject，很简单只是实现了Serializable接口罢了。

package com.google.code.garbagecan.minastudy.sample3;

import java.io.Serializable;

public class MyRequestObject implements Serializable {

	private static final long serialVersionUID = 1L;

	private String name;
	
	private String value;

	public MyRequestObject(String name, String value) {
		this.name = name;
		this.value = value;
	}
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getValue() {
		return value;
	}

	public void setValue(String value) {
		this.value = value;
	}
	
	@Override
	public String toString() {
		StringBuffer sb = new StringBuffer();
		sb.append("Request [name: " + name  + ", value: " + value + "]");
		return sb.toString();
	}
}

package com.google.code.garbagecan.minastudy.sample3;

import java.io.Serializable;

public class MyResponseObject implements Serializable {

	private static final long serialVersionUID = 1L;

	private String name;
	
	private String value;

	public MyResponseObject(String name, String value) {
		this.name = name;
		this.value = value;
	}
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getValue() {
		return value;
	}

	public void setValue(String value) {
		this.value = value;
	}
	
	@Override
	public String toString() {
		StringBuffer sb = new StringBuffer();
		sb.append("Response [name: " + name  + ", value: " + value + "]");
		return sb.toString();
	}
}

看看Server端的代码

package com.google.code.garbagecan.minastudy.sample3;

import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.serialization.ObjectSerializationCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyServer {
	
	private static final Logger logger = LoggerFactory.getLogger(MyServer.class);
	
	public static void main(String[] args) {
		IoAcceptor acceptor = new NioSocketAcceptor();

		acceptor.getFilterChain().addLast("logger", new LoggingFilter());
		acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(new ObjectSerializationCodecFactory()));

		acceptor.setHandler(new IoHandlerAdapter() {
			
			@Override
			public void sessionCreated(IoSession session) throws Exception {
			}
			
			@Override
			public void sessionOpened(IoSession session) throws Exception {
			}

			@Override
			public void sessionClosed(IoSession session) throws Exception {
			}

			@Override
			public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
			}

			@Override
			public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
				logger.error(cause.getMessage(), cause);
				session.close(true);
			}

			@Override
			public void messageReceived(IoSession session, Object message) throws Exception {
				logger.info("Received " + message);
				MyRequestObject myReqOjb = (MyRequestObject) message;
				MyResponseObject myResObj = new MyResponseObject(myReqOjb.getName(), myReqOjb.getValue());
				session.write(myResObj);
			}

			@Override
			public void messageSent(IoSession session, Object message) throws Exception {
				logger.info("Sent " + message);
			}
		});
		
		try {
			acceptor.bind(new InetSocketAddress(10000));
		} catch (IOException ex) {
			logger.error(ex.getMessage(), ex);
		}
	}
}

1. 首先创建I/O Service，这里使用的是NioSocketAcceptor类来创建了一个IoAcceptor实例。

2. 创建I/O Filter Chain，这里使用了两个个IoFilter，一个是LoggingFilter用来记录日志和打印事件消息，另一个是ProtocolCodecFilter实例用来编码数据，这里使用了ObjectSerializationCodecFactory类来序列化或反序列化数据成java对象。

3. 创建I/O Handler，这里主要看一下messageReceived方法，其总接收了MyRequestObject对象，然后又发送了一个MyResponseObject对象给Client端。

4. 最后就是让IoAcceptor类实例绑定端口实现监听。

看看Client端的代码

package com.google.code.garbagecan.minastudy.sample3;

import java.net.InetSocketAddress;

import org.apache.mina.core.RuntimeIoException;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.core.service.IoConnector;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.serialization.ObjectSerializationCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketConnector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyClient {
	
	private static final Logger logger = LoggerFactory.getLogger(MyClient.class);
	
	public static void main(String[] args) {
		IoConnector connector = new NioSocketConnector();
		connector.setConnectTimeoutMillis(10 * 1000);
		
		connector.getFilterChain().addLast("logger", new LoggingFilter());
		connector.getFilterChain().addLast("codec", new ProtocolCodecFilter(new ObjectSerializationCodecFactory()));
		
		connector.setHandler(new IoHandlerAdapter() {
			
			@Override
			public void sessionCreated(IoSession session) throws Exception {
			}

			@Override
			public void sessionOpened(IoSession session) throws Exception {
				MyRequestObject myObj = new MyRequestObject("my name", "my value");
				session.write(myObj);
			}

			@Override
			public void sessionClosed(IoSession session) throws Exception {
			}

			@Override
			public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
			}

			@Override
			public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
				logger.error(cause.getMessage(), cause);
				session.close(true);
			}

			@Override
			public void messageReceived(IoSession session, Object message) throws Exception {
				MyResponseObject myResObj = (MyResponseObject) message;
				logger.info("Received " + myResObj);
				session.close(true);
			}

			@Override
			public void messageSent(IoSession session, Object message) throws Exception {
				logger.info("Sent " + message);
			}
		});

		IoSession session = null;
		try {
			ConnectFuture future = connector.connect(new InetSocketAddress("localhost", 10000));
			future.awaitUninterruptibly();
			session = future.getSession();
		} catch (RuntimeIoException e) {
			logger.error(e.getMessage(), e);
		}

		session.getCloseFuture().awaitUninterruptibly();
		connector.dispose();
	}
}

1. 首先创建I/O Service，这里使用的是NioSocketConnector类来创建了一个IoConnector实例，并设置连接超时为10秒。

2. 创建I/O Filter Chain，和服务器端同样设置了两个IoFilter，一个是LoggingFilter用来记录日志和打印事件消息，另一个是ProtocolCodecFilter实例用来编码数据，这里也使用了ObjectSerializationCodecFactory类来序列化或反序列化数据成java对象。

3. 创建I/O Handler，主要看一下sessionOpened方法，其中在会话建立事件中发送了MyRequestObject对象，然后在messageReceived方法中又接受了MyResponseObject对象。

4. 最后就是IoConnector实例类连接远端的Server。

下面测试一下上面的程序，首先运行MyServer类，然后运行MyClient类，就可以分别在各自的终端上看到事件日志以及发送/接收的对象了。