Java Socket实战之五 使用加密协议传输对象

本文地址：http://blog.csdn.net/kongxx/article/details/7259837

Java Socket实战之一 单线程通信

Java Socket实战之二 多线程通信

Java Socket实战之三 传输对象

Java Socket实战之四 传输压缩对象

前面几篇博文提到了Socket中一些常用的用法，但是对于一些有安全要求的应用就需要加密传输的数据，此时就需要用到SSLSocket了。

还是一样需要一个实现了java.io.Serializable接口的简单Java对象

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

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;
	}
	
}

SSL Server类，这里需要用到ServerSocketFactory类来创建SSLServerSocket类实例，然后在通过SSLServerSocket来获取SSLSocket实例，这里考虑到面向对象中的面向接口编程的理念，所以代码中并没有出现SSLServerSocket和SSLSocket，而是用了他们的父类ServerSocket和Socket。在获取到ServerSocket和Socket实例以后，剩下的代码就和不使用加密方式一样了。

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

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

import javax.net.ServerSocketFactory;
import javax.net.ssl.SSLServerSocketFactory;

public class MyServer {
	
	private final static Logger logger = Logger.getLogger(MyServer.class.getName());
	
	public static void main(String[] args) {
		try {
			ServerSocketFactory factory = SSLServerSocketFactory.getDefault();
			ServerSocket server = factory.createServerSocket(10000);
			
			while (true) {
				Socket socket = server.accept();
				invoke(socket);
			}
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}
	
	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();
	}
}

SSL Client类和SSL Server类类似，只是将其中获取Socket的方式有所变化，其余的代码也和不使用加密方式一样。

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

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;

import javax.net.SocketFactory;
import javax.net.ssl.SSLSocketFactory;

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 {
				SocketFactory factory = SSLSocketFactory.getDefault();
				socket = factory.createSocket("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) {}
			}
		}
	}
}

代码写完了，下面就需要产生keystore文件了，运行下面的命令

keytool -genkey -alias mysocket -keyalg RSA -keystore mysocket.jks

在提示输入项中，密码项自己给定，其它都不改直接回车，这里我使用的密码是“mysocket”。

运行Server

java -Djavax.net.ssl.keyStore=mysocket.jks -Djavax.net.ssl.keyStorePassword=mysocket com.googlecode.garbagecan.test.socket.ssl.MyServer

运行Client

java -Djavax.net.ssl.trustStore=mysocket.jks  -Djavax.net.ssl.trustStorePassword=mysocket com.googlecode.garbagecan.test.socket.ssl.MyClient