sslsocketclient.java

jdk-6u10-docs java开发宝典

/*
 * @(#)SSLSocketClient.java	1.3 01/05/10
 *
 * Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved. 
 *
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following 
 * conditions are met: 
 * 
 * -Redistribution of source code must retain the above copyright 
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistribution in binary form must reproduce the above copyright 
 * notice, this list of conditions and the following disclaimer in 
 * the documentation and/or other materials provided with the 
 * distribution. 
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of 
 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any 
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY 
 * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT 
 * OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS 
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
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 * You acknowledge that this software is not designed, licensed or 
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 */

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/1.0");
	    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();
	}
    }
}