Java Socket实战之三 传输对象

本文地址：http://blog.csdn.net/kongxx/article/details/7259827

Java Socket实战之一 单线程通信

Java Socket实战之二 多线程通信

前面两篇文章介绍了怎样建立Java Socket通信，这一篇说一下怎样使用Java Socket来传输对象。

首先需要一个普通的对象类，由于需要序列化这个对象以便在网络上传输，所以实现java.io.Serializable接口就是必不可少的了，入下：

package com.googlecode.garbagecan.test.socket.sample3;

public class User implements java.io.Serializable {
	private static final long serialVersionUID = 1L;
	private String name;
	private String password;

	public User() {
		
	}
	
	public User(String name, String password) {
		this.name = name;
		this.password = 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;
	}
}

对于Server端的代码，代码中分别使用了ObjectInputStream和ObjectOutputStream来接收和发送socket中的InputStream和OutputStream，然后转换成Java对象，如下：

package com.googlecode.garbagecan.test.socket.sample3;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;

public class MyServer {

	private final static Logger logger = Logger.getLogger(MyServer.class.getName());
	
	public static void main(String[] args) throws IOException {
		ServerSocket server = new ServerSocket(10000);

		while (true) {
			Socket socket = server.accept();
			invoke(socket);
		}
	}

	private static void invoke(final Socket socket) throws IOException {
		new Thread(new Runnable() {
			public void run() {
				ObjectInputStream is = null;
				ObjectOutputStream os = null;
				try {
					is = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
					os = new ObjectOutputStream(socket.getOutputStream());

					Object obj = is.readObject();
					User user = (User)obj;
					System.out.println("user: " + user.getName() + "/" + user.getPassword());

					user.setName(user.getName() + "_new");
					user.setPassword(user.getPassword() + "_new");

					os.writeObject(user);
					os.flush();
				} catch (IOException ex) {
					logger.log(Level.SEVERE, null, ex);
				} catch(ClassNotFoundException ex) {
					logger.log(Level.SEVERE, null, ex);
				} finally {
					try {
						is.close();
					} catch(Exception ex) {}
					try {
						os.close();
					} catch(Exception ex) {}
					try {
						socket.close();
					} catch(Exception ex) {}
				}
			}
		}).start();
	}
}

Client也和Server端类似，同样使用ObjectOutputStream和ObjectInputStream来处理，如下：

package com.googlecode.garbagecan.test.socket.sample3;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;

public class MyClient {
	
	private final static Logger logger = Logger.getLogger(MyClient.class.getName());
	
	public static void main(String[] args) throws Exception {
		for (int i = 0; i < 100; i++) {
			Socket socket = null;
			ObjectOutputStream os = null;
			ObjectInputStream is = null;
			
			try {
				socket = new Socket("localhost", 10000);
	
				os = new ObjectOutputStream(socket.getOutputStream());
				User user = new User("user_" + i, "password_" + i);
				os.writeObject(user);
				os.flush();
				
				is = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
				Object obj = is.readObject();
				if (obj != null) {
					user = (User)obj;
					System.out.println("user: " + user.getName() + "/" + user.getPassword());
				}
			} catch(IOException ex) {
				logger.log(Level.SEVERE, null, ex);
			} finally {
				try {
					is.close();
				} catch(Exception ex) {}
				try {
					os.close();
				} catch(Exception ex) {}
				try {
					socket.close();
				} catch(Exception ex) {}
			}
		}
	}
}

最后测试上面的代码，首先运行Server类，然后运行Client类，就可以分别在Server端和Client端控制台看到接收到的User对象实例了。