数字证书

1.Socket服务端

package com.test;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

import javax.net.ssl.SSLServerSocket;
import javax.net.ssl.SSLServerSocketFactory;

public class ServerSocketTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
//		ServerSocket ss = new ServerSocket(6666);
		/**
		 * 可以通过keytool生成证书
		 */
		String userHome = System.getProperty("user.home");
		System.setProperty("javax.net.ssl.keyStore", userHome + "/.keystore");
		System.setProperty("javax.net.ssl.keyStorePassword", "123456");
		SSLServerSocketFactory sslFactory = (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();
		SSLServerSocket ss = (SSLServerSocket)sslFactory.createServerSocket(6666);
		
		for (int i = 0; i < 5; i++) {
			final Socket socket = ss.accept();
			new Thread() {
				public void run() {
					InputStream is = null;
					OutputStream os = null;
					try {
						
						is = socket.getInputStream();
						os = socket.getOutputStream();

						byte[] buf = new byte[1024];
						int len = 0;

						len = is.read(buf);
						System.out.println(new String(buf, 0, len));

						os.write("hello".getBytes());
						
					} catch (Exception ex) {
						ex.printStackTrace();
					}finally{
						try{os.close();}catch(Exception e){};
						try{is.close();}catch(Exception e){};
						try{socket.close();}catch(Exception e){};
					}
				};
			}.start();
		}

	}

}

2.Socket客户端

package com.test;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;

public class SocketTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
//		Socket socket = new Socket("192.200.216.67",6666);
		/**
		 * 客户端，证书可以导入JAVA_HOME\jre6\lib\security\cacerts下，或设置系统属性
		 *  javax.net.ssl.trustStoreType
		 *  javax.net.ssl.trustStore
		 */
		SSLSocketFactory factory = (SSLSocketFactory)SSLSocketFactory.getDefault();
		SSLSocket socket = (SSLSocket)factory.createSocket("192.200.216.67",6666);
		
		InputStream is = null;
		OutputStream os = null;
		try {
			
			is = socket.getInputStream();
			os = socket.getOutputStream();
			
			os.write("world".getBytes());
			
			byte[] buf = new byte[1024];
			int len = 0;

			len = is.read(buf);
			System.out.println(new String(buf, 0, len));
			
		} catch (Exception ex) {
			ex.printStackTrace();
		}finally{
			try{os.close();}catch(Exception e){};
			try{is.close();}catch(Exception e){};
			try{socket.close();}catch(Exception e){};
		}
	}

}