browserlauncher.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

                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) {
                errorMessage = se.getMessage();
                return false;
            } catch (IllegalAccessException iae) {
                errorMessage = iae.getMessage();
                return false;
            }
            break;
        case MRJ_3_0:
            try {
                Class linker = Class.forName("com.apple.mrj.jdirect.Linker");
                Constructor constructor = linker.getConstructor(new Class[]{ Class.class });
                /*linkage = */constructor.newInstance(new Object[] { BrowserLauncher.class });
            } catch (ClassNotFoundException cnfe) {
                errorMessage = cnfe.getMessage();
                return false;
            } catch (NoSuchMethodException nsme) {
                errorMessage = nsme.getMessage();
                return false;
            } catch (InvocationTargetException ite) {
                errorMessage = ite.getMessage();
                return false;
            } catch (InstantiationException ie) {
                errorMessage = ie.getMessage();
                return false;
            } catch (IllegalAccessException iae) {
                errorMessage = iae.getMessage();
                return false;
            }
            break;
        case MRJ_3_1:
            try {
                mrjFileUtilsClass = Class.forName("com.apple.mrj.MRJFileUtils");
                openURL = mrjFileUtilsClass.getDeclaredMethod("openURL", new Class[] { String.class });
            } catch (ClassNotFoundException cnfe) {
                errorMessage = cnfe.getMessage();
                return false;
            } catch (NoSuchMethodException nsme) {
                errorMessage = nsme.getMessage();
                return false;
            }
            break;
        case MRJ_4_1:
            try {
                mrjFileUtilsClass = Class.forName("com.apple.eio.FileManager");
                openURL = mrjFileUtilsClass.getDeclaredMethod("openURL", new Class[] { String.class });
            } catch (ClassNotFoundException cnfe) {
                errorMessage = cnfe.getMessage();
                return false;
            } catch (NoSuchMethodException nsme) {
                errorMessage = nsme.getMessage();
                return false;
            }
            break;
        default:
            break;
        }
        return true;
    }

    /**
     * Attempts to locate the default web browser on the local system.  Caches results so it
     * only locates the browser once for each use of this class per JVM instance.
     * @return The browser for the system.  Note that this may not be what you would consider
     *                  to be a standard web browser; instead, it's the application that gets called to
     *                  open the default web browser.  In some cases, this will be a non-String object
     *                  that provides the means of calling the default browser.
     */
    private static Object locateBrowser() {
        if (browser != null) {
            return browser;
        }
        switch (jvm) {
        case MRJ_2_0:
            try {
                Integer finderCreatorCode = (Integer) makeOSType.invoke(null, new Object[] { FINDER_CREATOR });
                Object aeTarget = aeTargetConstructor.newInstance(new Object[] { finderCreatorCode });
                Integer gurlType = (Integer) makeOSType.invoke(null, new Object[] { GURL_EVENT });
                Object appleEvent = appleEventConstructor.newInstance(new Object[] { gurlType, gurlType, aeTarget, kAutoGenerateReturnID, kAnyTransactionID });
                // Don't set browser = appleEvent because then the next time we call
                // locateBrowser(), we'll get the same AppleEvent, to which we'll already have
                // added the relevant parameter. Instead, regenerate the AppleEvent every time.
                // There's probably a way to do this better; if any has any ideas, please let
                // me know.
                return appleEvent;
            } catch (IllegalAccessException iae) {
                browser = null;
                errorMessage = iae.getMessage();
                return browser;
            } catch (InstantiationException ie) {
                browser = null;
                errorMessage = ie.getMessage();
                return browser;
            } catch (InvocationTargetException ite) {
                browser = null;
                errorMessage = ite.getMessage();
                return browser;
            }
        case MRJ_2_1:
            File systemFolder;
            try {
                systemFolder = (File) findFolder.invoke(null, new Object[] { kSystemFolderType });
            } catch (IllegalArgumentException iare) {
                browser = null;
                errorMessage = iare.getMessage();
                return browser;
            } catch (IllegalAccessException iae) {
                browser = null;
                errorMessage = iae.getMessage();
                return browser;
            } catch (InvocationTargetException ite) {
                browser = null;
                errorMessage = ite.getTargetException().getClass() + ": " + ite.getTargetException().getMessage();
                return browser;
            }
            String[] systemFolderFiles = systemFolder.list();
            // Avoid a FilenameFilter because that can't be stopped mid-list
            for(int i = 0; i < systemFolderFiles.length; i++) {
                try {
                    File file = new File(systemFolder, systemFolderFiles[i]);
                    if (!file.isFile()) {
                        continue;
                    }
                    // We're looking for a file with a creator code of 'MACS' and
                    // a type of 'FNDR'.  Only requiring the type results in non-Finder
                    // applications being picked up on certain Mac OS 9 systems,
                    // especially German ones, and sending a GURL event to those
                    // applications results in a logout under Multiple Users.
                    Object fileType = getFileType.invoke(null, new Object[] { file });
                    if (FINDER_TYPE.equals(fileType.toString())) {
                        Object fileCreator = getFileCreator.invoke(null, new Object[] { file });
                        if (FINDER_CREATOR.equals(fileCreator.toString())) {
                            browser = file.toString();  // Actually the Finder, but that's OK
                            return browser;
                        }
                    }
                } catch (IllegalArgumentException iare) {
                    browser = null;
                    errorMessage = iare.getMessage();
                    return null;
                } catch (IllegalAccessException iae) {
                    browser = null;
                    errorMessage = iae.getMessage();
                    return browser;
                } catch (InvocationTargetException ite) {
                    browser = null;
                    errorMessage = ite.getTargetException().getClass() + ": " + ite.getTargetException().getMessage();
                    return browser;
                }
            }
            browser = null;
            break;
        case MRJ_3_0:
        case MRJ_3_1:
        case MRJ_4_1:
            browser = "";       // Return something non-null
            break;
        case WINDOWS_NT:
            browser = "cmd.exe";
            break;
        case WINDOWS_9x:
            browser = "command.com";
            break;
        case OTHER:
        default:
            browser = "netscape";
            break;
        }
        return browser;
    }

    /**
     * Attempts to open the default web browser to the given URL.
     * @param url The URL to open
     * @throws IOException If the web browser could not be located or does not run
     */
    public static void openURL(String url) throws IOException {
        if (!loadedWithoutErrors) {
            throw new IOException("Exception in finding browser: " + errorMessage);
        }
        Object browser = locateBrowser();
        if (browser == null) {
            throw new IOException("Unable to locate browser: " + errorMessage);
        }
                
        switch (jvm) {
        case MRJ_2_0:
            Object aeDesc = null;
            try {
                aeDesc = aeDescConstructor.newInstance(new Object[] { url });
                putParameter.invoke(browser, new Object[] { keyDirectObject, aeDesc });
                sendNoReply.invoke(browser, new Object[] { });
            } catch (InvocationTargetException ite) {
                throw new IOException("InvocationTargetException while creating AEDesc: " + ite.getMessage());
            } catch (IllegalAccessException iae) {
                throw new IOException("IllegalAccessException while building AppleEvent: " + iae.getMessage());
            } catch (InstantiationException ie) {
                throw new IOException("InstantiationException while creating AEDesc: " + ie.getMessage());
            } finally {
                aeDesc = null;  // Encourage it to get disposed if it was created
                browser = null; // Ditto
            }
            break;
        case MRJ_2_1:
            Runtime.getRuntime().exec(new String[] { (String) browser, url } );
            break;
        case MRJ_3_0:
            int[] instance = new int[1];
            int result = ICStart(instance, 0);
            if (result == 0) {
                int[] selectionStart = new int[] { 0 };
                byte[] urlBytes = url.getBytes();
                int[] selectionEnd = new int[] { urlBytes.length };
                result = ICLaunchURL(instance[0], new byte[] { 0 }, urlBytes,
                                     urlBytes.length, selectionStart,
                                     selectionEnd);
                if (result == 0) {
                    // Ignore the return value; the URL was launched successfully
                    // regardless of what happens here.
                    ICStop(instance);
                } else {
                    throw new IOException("Unable to launch URL: " + result);
                }
            } else {
                throw new IOException("Unable to create an Internet Config instance: " + result);
            }
            break;
        case MRJ_3_1:
        case MRJ_4_1:
            try {
                openURL.invoke(null, new Object[] { url });
            } catch (InvocationTargetException ite) {
                throw new IOException("InvocationTargetException while calling openURL: " + ite.getMessage());
            } catch (IllegalAccessException iae) {
                throw new IOException("IllegalAccessException while calling openURL: " + iae.getMessage());
            }
            break;
        case WINDOWS_NT:
        case WINDOWS_9x:
            // Add quotes around the URL to allow ampersands and other special
            // characters to work.
            Process process = Runtime.getRuntime().exec(new String[] { (String) browser,
                                                                       FIRST_WINDOWS_PARAMETER,
                                                                       SECOND_WINDOWS_PARAMETER,
                                                                       THIRD_WINDOWS_PARAMETER,
                                                                       '"' + url + '"' });
            // This avoids a memory leak on some versions of Java on Windows.
            // That's hinted at in <http://developer.java.sun.com/developer/qow/archive/68/>.
            try {
                process.waitFor();
                process.exitValue();
            } catch (InterruptedException ie) {
                throw new IOException("InterruptedException while launching browser: " + ie.getMessage());
            }
            break;
        case OTHER:
            // Assume that we're on Unix and that Netscape is installed
                                
            // First, attempt to open the URL in a currently running session of Netscape
            process = Runtime.getRuntime().exec(new String[] { (String) browser,
                                                               NETSCAPE_REMOTE_PARAMETER,
                                                               NETSCAPE_OPEN_PARAMETER_START +
                                                               url +
                                                               NETSCAPE_OPEN_PARAMETER_END });
            try {
                int exitCode = process.waitFor();
                if (exitCode != 0) {    // if Netscape was not open
                    Runtime.getRuntime().exec(new String[] { (String) browser, url });
                }
            } catch (InterruptedException ie) {
                throw new IOException("InterruptedException while launching browser: " + ie.getMessage());
            }
            break;
        default:
            // This should never occur, but if it does, we'll try the simplest thing possible
            Runtime.getRuntime().exec(new String[] { (String) browser, url });
            break;
        }
    }

    /**
     * Methods required for Mac OS X.  The presence of native methods does not cause
     * any problems on other platforms.
     */
    private native static int ICStart(int[] instance, int signature);
    private native static int ICStop(int[] instance);
    private native static int ICLaunchURL(int instance, byte[] hint, byte[] data, int len,
                                          int[] selectionStart, int[] selectionEnd);
}