Apache MINA实战之 对象传输

               

本文链接：http://blog.youkuaiyun.com/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。