Java Socket实战之五 使用加密协议传输对象

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

Java Socket实战之六 使用NIO包实现Socket通信

Java Socket实战之七 使用Socket通信传输文件

Java Socket实战之八 socket提升

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