Apache MINA中怎么进行对象传输，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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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. ***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. ***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。
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