Denne BrowserLauncher klasse er meget nem at bruge - se hvordan den bruges aller nederst:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class BrowserLauncher {
private static int jvm;
private static Object browser;
private static boolean loadedWithoutErrors;
private static Class mrjFileUtilsClass;
private static Class mrjOSTypeClass;
private static Class macOSErrorClass;
/** 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 getFileType method of com.apple.mrj.MRJOSType */
private static Method getFileType;
/** 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;
/** JVM constant for MRJ 2.0 */
private static final int MRJ_2_0 = 0;
/** JVM constant for MRJ 2.1 or later */
private static final int MRJ_2_1 = 1;
/** JVM constant for any Windows NT JVM */
private static final int WINDOWS_NT = 2;
/** JVM constant for any Windows 9x JVM */
private static final int WINDOWS_9x = 3;
/** 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 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_OPEN_PARAMETER_START = " -remote '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 ("Mac OS".equals(osName)) {
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) {
// For the time being, assume that all post-2.0 versions of MRJ work the same
jvm = MRJ_2_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) {
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 never be instantiated; this just ensures so.
*/
private BrowserLauncher() { }
/**
* 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:
try {
Class aeTargetClass = Class.forName("com.apple.MacOS.AETarget");
macOSErrorClass = Class.forName("com.apple.MacOS.MacOSError");
Class osUtilsClass = Class.forName("com.apple.MacOS.OSUtils");
Class appleEventClass = Class.forName("com.apple.MacOS.AppleEvent");
Class aeClass = Class.forName("com.apple.MacOS.ae");
aeDescClass = Class.forName("com.apple.MacOS.AEDesc");
aeTargetConstructor = aeTargetClass.getDeclaredConstructor(new Class [] { int.class });
appleEventConstructor = appleEventClass.getDeclaredConstructor(new Class[] { int.class, int.class, aeTargetClass, int.class, int.class });
aeDescConstructor = aeDescClass.getDeclaredConstructor(new Class[] { String.class });
makeOSType = osUtilsClass.getDeclaredMethod("makeOSType", new Class [] { String.class });
putParameter = appleEventClass.getDeclaredMethod("putParameter", new Class[] { int.class, aeDescClass });
sendNoReply = appleEventClass.getDeclaredMethod("sendNoReply", new Class[] { });
Field keyDirectObjectField = aeClass.getDeclaredField("keyDirectObject");
keyDirectObject = (Integer) keyDirectObjectField.get(null);
Field autoGenerateReturnIDField = appleEventClass.getDeclaredField("kAutoGenerateReturnID");
kAutoGenerateReturnID = (Integer) autoGenerateReturnIDField.get(null);
Field anyTransactionIDField = appleEventClass.getDeclaredField("kAnyTransactionID");
kAnyTransactionID = (Integer) anyTransactionIDField.get(null);
} catch (ClassNotFoundException cnfe) {
errorMessage = cnfe.getMessage();
return false;
} catch (NoSuchMethodException nsme) {
errorMessage = nsme.getMessage();
return false;
} catch (NoSuchFieldException nsfe) {
errorMessage = nsfe.getMessage();
return false;
} catch (IllegalAccessException iae) {
errorMessage = iae.getMessage();
return false;
}
break;
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 });
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;
}
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;
}
Object fileType = getFileType.invoke(null, new Object[] { file });
if (FINDER_TYPE.equals(fileType.toString())) {
browser = file.toString(); // Actually the Finder, but that's OK
return browser;
}
} catch (IllegalArgumentException iare) {
browser = browser;
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 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 WINDOWS_NT:
case WINDOWS_9x:
Runtime.getRuntime().exec(new String[] { (String) browser, FIRST_WINDOWS_PARAMETER,
SECOND_WINDOWS_PARAMETER, url });
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 process = Runtime.getRuntime().exec((String) browser +
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;
}
}
}
Du kan så åbne en side med:
try{
BrowserLauncher.openURL(textfieldSite.getText());
//BrowserLauncher.openURL("
http://www.exp.dk");
}
catch(Exception e){System.out.println(e);}
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