browserlauncher.java

这是linux下ssl vpn的实现程序

package com.sslexplorer.vpn.util;

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

/**
 * 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 {
            loadedWithoutErrors = false;
            errorMessage = "Unsupported MRJ version: " + version;
          }
        } catch (NumberFormatException nfe) {
          loadedWithoutErrors = false;
          errorMessage = "Invalid MRJ version: " + mrjVersion;
        }
      }
    } else if (osName.startsWith("Windows")) {
      if (osName.indexOf("9") != -1 || osName.indexOf("Me") != -1) {
        jvm = WINDOWS_9x;
      } else {
        jvm = WINDOWS_NT;
      }
    } else {
      jvm = OTHER;
    }

    if (loadedWithoutErrors) { // if we haven't hit any errors yet
      loadedWithoutErrors = loadClasses();
    }
  }

  /**
   * This class should be never be instantiated; this just ensures so.
   */
  private BrowserLauncher() {
  }

  /**
   * Manually set the browser command. If this is set then none the this command
   * will <b>always </b> be used.
   *
   * @param cmd
   *          browser command
   */
  public static void setBrowserCommand(String browserCommand) {
    BrowserLauncher.browserCommand = browserCommand;
  }

  /**
   * Split a string into an array taking into account delimiters, quotes
   * and escapes
   *
   * @param str string to split
   * @param delim delimiter
   * @param quote quote character
   * @param escape escape character
   * @return array
   */

  public static String[] splitString(String str, char delim, char quote, char escape) {
    Vector v = new Vector();
    StringBuffer str1 = new StringBuffer();
    char ch = ' ';
    boolean inQuote = false;
    boolean escaped = false;

    for (int i = 0; i < str.length(); i++) {
      ch = str.charAt(i);

      if ((escape != -1) && (ch == escape) && !escaped) {
        escaped = true;
      } else {
        if ((quote != -1) && (ch == quote) && !escaped) {
          inQuote = !inQuote;
        } else if (!inQuote && (ch == delim && !escaped)) {
          v.addElement(str1.toString());
          str1.setLength(0);
        } else {
          str1.append(ch);
        }
        if (escaped) {
          escaped = false;
        }
      }
    }

    if (str.length() > 0) {
      v.addElement(str1.toString());

    }
    String[] array;
    array = new String[v.size()];
    v.copyInto(array);

    return array;
  }

  /**
   * Called by a static initializer to load any classes, fields, and methods
   * required at runtime to locate the user's web browser.
   *
   * @return <code>true</code> if all intialization succeeded
   *         <code>false</code> if any portion of the initialization failed
   */
  private static boolean loadClasses() {
    switch (jvm) {
      case MRJ_2_0 :
        return loadMRJ20Classes();
      case MRJ_2_1 :
        try {
          mrjFileUtilsClass = Class.forName("com.apple.mrj.MRJFileUtils");
          mrjOSTypeClass = Class.forName("com.apple.mrj.MRJOSType");
          Field systemFolderField = mrjFileUtilsClass.getDeclaredField("kSystemFolderType");
          kSystemFolderType = systemFolderField.get(null);
          findFolder = mrjFileUtilsClass.getDeclaredMethod("findFolder", new Class[]{mrjOSTypeClass});
          getFileCreator = mrjFileUtilsClass.getDeclaredMethod("getFileCreator", new Class[]{File.class});
          getFileType = mrjFileUtilsClass.getDeclaredMethod("getFileType", new Class[]{File.class});
        } catch (ClassNotFoundException cnfe) {
          errorMessage = cnfe.getMessage();
          return false;
        } catch (NoSuchFieldException nsfe) {
          errorMessage = nsfe.getMessage();
          return false;
        } catch (NoSuchMethodException nsme) {
          errorMessage = nsme.getMessage();
          return false;
        } catch (SecurityException se) {