browserlauncher.java

这是linux下ssl vpn的实现程序

package com.sslexplorer.boot;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * BrowserLauncher is a class that provides one static method, openURL, which
 * opens the default web browser for the current user of the system to the given
 * URL. It may support other protocols depending on the system -- mailto, ftp,
 * etc. -- but that has not been rigorously tested and is not guaranteed to
 * work.
 * <p>
 * Yes, this is platform-specific code, and yes, it may rely on classes on
 * certain platforms that are not part of the standard JDK. What we're trying to
 * do, though, is to take something that's frequently desirable but inherently
 * platform-specific -- opening a default browser -- and allow programmers (you,
 * for example) to do so without worrying about dropping into native code or
 * doing anything else similarly evil.
 * <p>
 * Anyway, this code is completely in Java and will run on all JDK 1.1-compliant
 * systems without modification or a need for additional libraries. All classes
 * that are required on certain platforms to allow this to run are dynamically
 * loaded at runtime via reflection and, if not found, will not cause this to do
 * anything other than returning an error when opening the browser.
 * <p>
 * There are certain system requirements for this class, as it's running through
 * Runtime.exec(), which is Java's way of making a native system call.
 * Currently, this requires that a Macintosh have a Finder which supports the
 * GURL event, which is true for Mac OS 8.0 and 8.1 systems that have the
 * Internet Scripting AppleScript dictionary installed in the Scripting
 * Additions folder in the Extensions folder (which is installed by default as
 * far as I know under Mac OS 8.0 and 8.1), and for all Mac OS 8.5 and later
 * systems. On Windows, it only runs under Win32 systems (Windows 95, 98, and NT
 * 4.0, as well as later versions of all). On other systems, this drops back
 * from the inherently platform-sensitive concept of a default browser and
 * simply attempts to launch Netscape via a shell command.
 * <p>
 * This code is Copyright 1999-2002 by Eric Albert ([e-mail])
 * and may be redistributed or modified in any form without restrictions as long
 * as the portion of this comment from this paragraph through the end of the
 * comment is not removed. The author requests that he be notified of any
 * application, applet, or other binary that makes use of this code, but that's
 * more out of curiosity than anything and is not required. This software
 * includes no warranty. The author is not repsonsible for any loss of data or
 * functionality or any adverse or unexpected effects of using this software.
 * <p>
 * Credits: <br>
 * Steven Spencer, JavaWorld magazine ( <a
 * href="http://www.javaworld.com/javaworld/javatips/jw-javatip66.html">Java Tip
 * 66 </a>) <br>
 * Thanks also to Ron B. Yeh, Eric Shapiro, Ben Engber, Paul Teitlebaum, Andrea
 * Cantatore, Larry Barowski, Trevor Bedzek, Frank Miedrich, Ron Rabakukk, and
 * Glenn Vanderburg
 * 
 * @author Eric Albert ( <a
 *         href="mailto:[e-mail]">[e-mail] </a>)
 * @version 1.4b2
 * 
 * <p>
 * Additional
 * <p>
 * <p>
 * Changes made by Brett Smith ( <a href="mailto:[e-mail]">brett@3sp,com.
 * </a> to allow a command to be specified that will always be used. Copyright
 * 2004 3SP <a href="http://3sp.com">3SP </a>.
 */
public class BrowserLauncher {

    /**
     * The Java virtual machine that we are running on. Actually, in most cases
     * we only care about the operating system, but some operating systems
     * require us to switch on the VM.
     */
    private static int jvm;

    /** The browser for the system */
    private static Object browser;

    /** Browser command to always use */
    private static String browserCommand;

    /**
     * Caches whether any classes, methods, and fields that are not part of the
     * JDK and need to be dynamically loaded at runtime loaded successfully.
     * <p>
     * Note that if this is <code>false</code>,<code>openURL()</code> will
     * always return an IOException.
     */
    private static boolean loadedWithoutErrors;

    /** The com.apple.mrj.MRJFileUtils class */
    private static Class mrjFileUtilsClass;

    /** The com.apple.mrj.MRJOSType class */
    private static Class mrjOSTypeClass;

    /** The com.apple.MacOS.AEDesc class */
    private static Class aeDescClass;

    /** The <init>(int) method of com.apple.MacOS.AETarget */
    private static Constructor aeTargetConstructor;

    /** The <init>(int, int, int) method of com.apple.MacOS.AppleEvent */
    private static Constructor appleEventConstructor;

    /** The <init>(String) method of com.apple.MacOS.AEDesc */
    private static Constructor aeDescConstructor;

    /** The findFolder method of com.apple.mrj.MRJFileUtils */
    private static Method findFolder;

    /** The getFileCreator method of com.apple.mrj.MRJFileUtils */
    private static Method getFileCreator;

    /** The getFileType method of com.apple.mrj.MRJFileUtils */
    private static Method getFileType;

    /** The openURL method of com.apple.mrj.MRJFileUtils */
    private static Method openURL;

    /** The makeOSType method of com.apple.MacOS.OSUtils */
    private static Method makeOSType;

    /** The putParameter method of com.apple.MacOS.AppleEvent */
    private static Method putParameter;

    /** The sendNoReply method of com.apple.MacOS.AppleEvent */
    private static Method sendNoReply;

    /** Actually an MRJOSType pointing to the System Folder on a Macintosh */
    private static Object kSystemFolderType;

    /** The keyDirectObject AppleEvent parameter type */
    private static Integer keyDirectObject;

    /** The kAutoGenerateReturnID AppleEvent code */
    private static Integer kAutoGenerateReturnID;

    /** The kAnyTransactionID AppleEvent code */
    private static Integer kAnyTransactionID;

    /** The linkage object required for JDirect 3 on Mac OS X */
    // private static Object linkage;
    /** The framework to reference on Mac OS X 10.0.x */
    // private static final String JDirect_MacOSX =
    // "/System/Library/Frameworks/Carbon.framework/Frameworks/HIToolbox.framework/HIToolbox";
    /** JVM constant for MRJ 2.0 */
    private static final int MRJ_2_0 = 0;

    /** JVM constant for MRJ 2.1.x and 2.2.x */
    private static final int MRJ_2_1 = 1;

    /** JVM constant for Java on Mac OS X 10.0 (MRJ 3.0) */
    private static final int MRJ_3_0 = 3;

    /** JVM constant for Java 1.3.x on Mac OS X 10.1 and later (MRJ 3.1 and 3.2) */
    private static final int MRJ_3_1 = 4;

    /** JVM constant for Java 1.4.x and later on Mac OS X */
    private static final int MRJ_COCOA = 5;

    /** JVM constant for any Windows NT JVM */
    private static final int WINDOWS_NT = 6;

    /** JVM constant for any Windows 9x JVM */
    private static final int WINDOWS_9x = 7;

    /** JVM constant for any other platform */
    private static final int OTHER = -1;

    /**
     * The file type of the Finder on a Macintosh. Hardcoding "Finder" would
     * keep non-U.S. English systems from working properly.
     */
    private static final String FINDER_TYPE = "FNDR";

    /**
     * The creator code of the Finder on a Macintosh, which is needed to send
     * AppleEvents to the application.
     */
    private static final String FINDER_CREATOR = "MACS";

    /** The name for the AppleEvent type corresponding to a GetURL event. */
    private static final String GURL_EVENT = "GURL";

    /**
     * The first parameter that needs to be passed into Runtime.exec() to open
     * the default web browser on Windows.
     */
    private static final String FIRST_WINDOWS_PARAMETER = "/c";

    /** The second parameter for Runtime.exec() on Windows. */
    private static final String SECOND_WINDOWS_PARAMETER = "start";

    /**
     * The third parameter for Runtime.exec() on Windows. This is a "title"
     * parameter that the command line expects. Setting this parameter allows
     * URLs containing spaces to work.
     */
    private static final String THIRD_WINDOWS_PARAMETER = "\"\"";

    /**
     * The shell parameters for Netscape that opens a given URL in an
     * already-open copy of Netscape on many command-line systems.
     */
    private static final String NETSCAPE_REMOTE_PARAMETER = "-remote";
    private static final String NETSCAPE_OPEN_PARAMETER_START = "'openURL(";
    private static final String NETSCAPE_OPEN_PARAMETER_END = ")'";

    /**
     * The message from any exception thrown throughout the initialization
     * process.
     */
    private static String errorMessage;

    /**
     * An initialization block that determines the operating system and loads
     * the necessary runtime data.
     */
    static {
        loadedWithoutErrors = true;
        String osName = System.getProperty("os.name");
        if (osName.startsWith("Mac OS")) {
            String javaVersion = System.getProperty("java.version");
            String majorJavaVersion = javaVersion.substring(0, 3);
            try {
                double version = Double.valueOf(majorJavaVersion).doubleValue();
                if (version >= 1.4) {
                    jvm = MRJ_COCOA;
                }
            } catch (NumberFormatException nfe) {
                // Fall through to earlier versions of Java on the Mac.
            }
            if (jvm != MRJ_COCOA) {
                String mrjVersion = System.getProperty("mrj.version");
                String majorMRJVersion = mrjVersion.substring(0, 3);
                try {
                    double version = Double.valueOf(majorMRJVersion).doubleValue();
                    if (version == 2) {
                        jvm = MRJ_2_0;
                    } else if (version >= 2.1 && version < 3) {
                        // Assume that all post-2.1 2.x versions of MRJ work the
                        // same. MRJ
                        // 2.1 actually
                        // works via Runtime.exec() and 2.2 supports that but
                        // has an
                        // openURL() method
                        // as well that we don't use because the Runtime.exec()
                        // method works
                        // fine.
                        jvm = MRJ_2_1;
                    } else if (version == 3.0) {
                        jvm = MRJ_3_0;
                    } else if (version >= 3.1) {
                        // Assume that all 3.1 and later versions of MRJ work
                        // the same.
                        jvm = MRJ_3_1;
                    } else {