browserlauncher.java

这是linux下ssl vpn的实现程序

                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:
                browser = ""; // Return something non-null
                break;
            case WINDOWS_NT:
                browser = "cmd.exe";
                break;
            case WINDOWS_9x:
                browser = "command.com";
                break;
            case OTHER:
            default:
                // On systems other than Windows and the Mac, we try via a
                // rather Unix-
                // specific hack to read the BROWSER environment variable
                // <http://tuxedo.org/~esr/BROWSER/>. If we can't read that
                // variable or
                // it isn't set, we use Netscape.
                // Note: This is commented out for now. It'll work soon.
                browser = getEnvironmentBrowser();
                if (browser == null) {
                    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);
        }

        if (browserCommand != null) {
            String[] cmd = Util.splitString(browserCommand, ' ', '"', '\\');
            String[] cmde = new String[cmd.length + 1];
            System.arraycopy(cmd, 0, cmde, 0, cmd.length);
            cmde[cmd.length] = url;
            Runtime.getRuntime().exec(cmde);
            return;
        }

        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_COCOA:
                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.
                String[] arguments;
                if (jvm == WINDOWS_9x) {
                    arguments = new String[] {
                                    (String) browser, FIRST_WINDOWS_PARAMETER, SECOND_WINDOWS_PARAMETER, null
                    };
                } else {
                    arguments = new String[] {
                                    (String) browser, FIRST_WINDOWS_PARAMETER, SECOND_WINDOWS_PARAMETER, THIRD_WINDOWS_PARAMETER,
                                    null
                    };
                }
                arguments[arguments.length - 1] = '"' + url + '"';
                Process process = Runtime.getRuntime().exec(arguments);
                // 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

                // 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;
        }
    }

    /**
     * Tries to read the BROWSER environment variable, which should be set to
     * the absolute path of the user's preferred web browser as proposed at
     * <http://tuxedo.org/~esr/BROWSER/>.
     * 
     * @return The value of the BROWSER environment variable, or null if the
     *         variable does not exist or can't be read.
     */
    private static String getEnvironmentBrowser() {
        String browser = null;
        try {
            String[] echoParams = {
                            "/bin/sh", "-c", "echo ${BROWSER:-netscape}"
            };
            Process echoProcess = Runtime.getRuntime().exec(echoParams);
            InputStream echoStream = echoProcess.getInputStream();
            BufferedReader echoReader = new BufferedReader(new InputStreamReader(echoStream));
            browser = echoReader.readLine();
            echoReader.close();
        } catch (Throwable t) {
            // If anything goes wrong, we'll return null.
        }
        return browser;
    }

    /*
     * Methods required for Mac OS X 10.0.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);
}