sslsocketclient.java

java安全

/*
 * @(#)SSLSocketClient.java	1.2 00/06/21
 *
 * Copyright 1995-1998, 2000 by Sun Microsystems, Inc.,
 * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information
 * of Sun Microsystems, Inc. ("Confidential Information").  You
 * shall not disclose such Confidential Information and shall use
 * it only in accordance with the terms of the license agreement
 * you entered into with Sun.
 */

import java.net.*;
import java.io.*;
import javax.net.ssl.*;

/*
 * This example demostrates how to use a SSLSocket as client to
 * send a HTTP request and get response from an HTTPS server.
 * It assumes that the client is not behind a firewall
 */

public class SSLSocketClient {

    public static void main(String[] args) throws Exception {
	try {
	    SSLSocketFactory factory =
		(SSLSocketFactory)SSLSocketFactory.getDefault();
	    SSLSocket socket =
		(SSLSocket)factory.createSocket("www.verisign.com", 443);

	    /*
	     * send http request
	     *
	     * Before any application data is sent or received, the
	     * SSL socket will do SSL handshaking first to set up
	     * the security attributes.
	     *
	     * SSL handshaking can be initiated by either flushing data
	     * down the pipe, or by starting the handshaking by hand.
	     *
	     * Handshaking is started manually in this example because
	     * PrintWriter catches all IOExceptions (including
	     * SSLExceptions), sets an internal error flag, and then
	     * returns without rethrowing the exception.
	     *
	     * Unfortunately, this means any error messages are lost,
	     * which caused lots of confusion for others using this
	     * code.  The only way to tell there was an error is to call
	     * PrintWriter.checkError().
	     */
	    socket.startHandshake();

	    PrintWriter out = new PrintWriter(
				  new BufferedWriter(
				  new OutputStreamWriter(
     				  socket.getOutputStream())));

	    out.println("GET http://www.verisign.com/index.html HTTP/1.1");
	    out.println();
	    out.flush();

	    /*
	     * Make sure there were no surprises
	     */
	    if (out.checkError())
		System.out.println(
		    "SSLSocketClient:  java.io.PrintWriter error");

	    /* read response */
	    BufferedReader in = new BufferedReader(
				    new InputStreamReader(
				    socket.getInputStream()));

	    String inputLine;
	    while ((inputLine = in.readLine()) != null)
		System.out.println(inputLine);

	    in.close();
	    out.close();
	    socket.close();

	} catch (Exception e) {
	    e.printStackTrace();
	}
    }
}