? SplashScreen - retrieving an image from a jar file ?

When you want to use the Java SplashScreen you provide a run flag of the form:
-splash:image.png
Is there a way to have the 'image.png' reference a file in one of the jar files?I don't believe the jar files are loaded by the time SplashScreen activates so that might be why I can't seem to be able to do it, but that was when I checked over a year ago ... have things changed?
Alternatively (and probably the preferred option for me) is there a way to tell the SplashScreen to create an empty splash so that one exists when I use the 'splash.setImageUrl()' method? Currently I have to set the splash image to be some empty/transparent image via:
-splash:empty.png
Then I set my own desired image via the 'splash.setImageUrl()' method...BUT, I still need to have the 'empty.png' file contained in the root folder of my project and this sucks. I'd like to be able to tell java that I want to create an empty splash, without having to provide an empty image, and then when the splash is created, I can use the image url method as normal to write my own image to the splash display.
thx.

morgalr, this is independent of code, it's just the splash screen that start up before any code runs so you could do this with any of your projects that you have.
You need to specify splash image via run command of:
-splash:image.png
so, if you have a jar file that has an image in it, and you place it on your classpath and then try to run your code with
-splash:package/path/image.png
it doesn't seem to work...you'll know because either you'll see a splash screen or you won't. Note that the splash screen disappears the first time an AWT/Swing event is encountered (ie a frame is displayed, etc) so it may only last a few milliseconds but it still should come up. All of the links that discuss this talk about specifying a path to an images directory, but this images directory has to be in your project root folder and not in the source tree (as best as I can tell through experimentation).
I guess what I would ultimately want would be to be able to create a SplashScreen instance through each program in my project without having to provide a runtime flag that only generates the instance if the provided image is available. If I it still provided a SplashScreen instance then I would be able to use the setImageUrl() method from code to provide the desired image. Also, it would be nice if the splashscreen remained some set time even after the application window popped up with an AWT/Swing event that now causes it to disappear instantly...but that one I can overcome with my own JWindow post-splash display that mimics the effect.
thanks.

Similar Messages

Read images from a jar file?

Hello, I'm converting a 6i app to 10g. This app does a ton of read_image_file() calls to
change GIF images on the screen based on user actions. In 6i the images are all stored on the local hard drive. The images are not icons for buttons, but images that appear in different locations on the screen.
For 10g, is it possible to leave the images in a jar file and effectively read the images from that? Otherwise, I suppose I'm looking at using webutil functionality to download the jar file and unjar it into an images directory for reading from the client?
Any best-practice scenario for this sort of thing?
Thanks for any info,
Gary

We are migrating from 6i to 10g too. And I try to not use webutil. All my pictures (icons gif files) are in a jar file.
Just make attention of the size of your pictures. The jar file is loaded when you launch the application (the first time, and after, only if the jar file has changed).

Issues with Loading Images from a Jar File

This code snippet basically loops through a jar of gifs and loads them into a hashmap to be used later. The images all load into the HashMap just fine, I tested and made sure their widths and heights were changing as well as the buffer size from gif to gif. The problem comes in when some of the images are loaded to be painted they are incomplete it looks as though part of the image came through but not all of it, while other images look just fine. The old way in which we loaded the graphics didn't involve getting them from a jar file. My question is, is this a common problem with loading images from a jar from an applet? For a while I had tried to approach the problem by getting the URL of the image in a jar and passing that into the toolkit and creating the image that way, I was unsuccessful in getting that to work.
//app is the Japplet
MediaTracker tracker = new MediaTracker(app);
//jf represents the jar file obj, enum for looping through jar entries
Enumeration e = jf.entries();
Toolkit toolkit = Toolkit.getDefaultToolkit();
//buffer for reading image stream
byte buffer [];
while(e.hasMoreElements())
fileName = e.nextElement().toString();
InputStream inputstream = jf.getInputStream(jf.getEntry(fileName));
buffer = new byte[inputstream.available()];
inputstream.read(buffer);
currentIm = toolkit.createImage(buffer);
tracker.addImage(currentIm, 0);
tracker.waitForAll();
images.put(fileName.substring(0, fileName.indexOf(".")), currentIm);
} //while
}//try
catch(Exception e)
e.printStackTrace();
}

compressed files are not the problem. It is just the problem of the read not returning all the bytes. Here is a working implementation:
InputStream is = jar.getInputStream(entry);
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
try{
byte[] buf = new byte[1024];
int read;
while((read = is.read(buf)) > 0) {
os.write(buf, 0, read);
catch(Exception e){
e.printStackTrace();
return null;
image = Toolkit.getDefaultToolkit().createImage(os.toByteArray());
This works but I think you end up opening the jar a second time and downloading it from the server again. Another way of getting the images is using the class loader:
InputStream is = MyApplet.class.getResourceAsStream(strImageName);
In this case, the image file needs to be at the same level than MyApplet.class but you don't get the benefit of enumerating of the images available in the jar.

Read images from external jar file (Sun's Java L&F Graphics repository)

Hi!
I don't know how to read images from an external jar file. Sun has a Java Look and Feel graphics repository that contains a lot of good images that can be used on buttons and so on. This repository is delivered as a jar file, containing only images, and I want to read the image files from that jar file directly without including them inside my application jar file. The application and image jar files will be in the same directory.
I have absolutely no clue how to solve this. Is it necessary to include the images inside my application jar file or is it possible to have them separate as I want.
Would really appreciate some help!
Best regards
Lars

Hi,
There is two ways :
1) Add your jarfile to the classpath.
Use the class loader :
URL url = ClassLoader.getSystemResource("your/package/image.gif");
Image im = (new ImageIcon(url)).getImage();
or
Image im = Toolkit.getDefaultToolkit().getImage(url);2)If you don't want to add the jar to the classpath you can use this (under jdk 1.4):
import java.util.*;
import java.util.jar.*;
import java.awt.*;
import java.io.*;
import java.awt.image.*;
import javax.imageio.*;
public class ImageUtilities {
     public static Image getImage(String jarFileName, String fileName) {
          BufferedImage image = null;
          try {
               JarFile jar = new JarFile(new File(jarFileName), false, JarFile.OPEN_READ);
               JarEntry entry = jar.getJarEntry(fileName);
               BufferedInputStream stream = new BufferedInputStream(jar.getInputStream(entry));
               image = ImageIO.read(stream) ;
          catch (Exception ex) {
               System.out.println(ex);
          return(image);
}I hope this helps,
Denis

Loading images from a jar file

Hi,
My application displays images, until it's placed in a JAR file, then it can't display them even though the JAR file contains the images.
I saw this problem in a previous question which was solved using
URL url = MyClass.class.getResource("abc.gif");
Image img=Toolkit.getDefaultToolkit().getImage(url);
....which btw didn't work for me either......
This method should be made obsolete using ImageIcon, which I am using, but the images still won't appear...
Any suggestions?

It works fine that way (...getClass().getResource....) until I create the jar file, and then I get a null pointer exception when it tries to load the image.
When I use
javax.swing.ImageIcon icon = new javax.swing.ImageIcon(("/images/imageName.jpg"));
the application works but without the images.......

Any way to retrieve this image from my cache? When saved it only saves as a 1.7KB blank file.

I'm trying to retrieve an image from Firefox's cache but so far have had no luck in doing so. The picture was hosted on imageshack and I had it open in a window but when I refreshed the page several hours later it was gone. I refreshed the page several more times, tried messing with the url to see if that did anything, but no luck. I haven't cleared anything on Firefox so I'm hoping there's some way I can recover it from the cache.
I followed the instructions on this page: http://groups.google.com/group/mozilla.support.firefox/msg/73bab3fb55ac5b42
However, when I right clicked the URL and chose "Save Link As..." it only saved a 1.7KB file that none of my photo editing programs can recognize or open. I've tried going to cache entries for other image links and saving them and when I choose Save Link As for those they save just fine, and in full size, so I'm not sure why this one won't work...I'm using Offline Mode so I'm not sure why the picture no longer being hosted online should make a difference one way or the other. I'm just hoping that my act of refreshing the page and nothing being there didn't overwrite the cache file and thus erase the cache'd image.
So is there any hope of retrieving this picture or is it gone for good?

Hi.
Once the image in question is replace with another one, the old one is erased. That is to say, if you open an image, say www.domain.com/image.png, and it's a 200x200 image, then you close it, it's still on cache, and you can access it through the cache. But if the image is changed in the server, that same exact url, and you access it again, at you see a 250x200 image (just an example), then the 200x200 is gone forever.
Your hope is that you never accessed the same URL again, so the old cache wasn't erased. If you know the url of the image, simply select offline mode (File > Work Offline, I think) and access its url. It will load the cached version and not check for the online one. Only if there is a cached version, of course.
I hope this helps.

How to add multiple images to a JLabel from the jar file

I want to add multiple images in a JLabel but the icon property only allows me to add one. I thought I could use html rendering to add the images I need by using the <img> tab, but I need to use a URL that points to the image.
How do I point to an image inside the jar file? If I can't, is there another way to show multiple images in a JLabel from the jar file?

Thanks, it works perfectly. It's a really smart way of fixing the problem too :)
I also found your toggle button icon classes which is something I've also had a problem with.
Thanks.

How do I store images in a jar file to be displayed on a jsp?

Afternoon all,
I have created a java component which accepts some parameters and returns a string. The returned string contains html tags to display a table in a webpage when rendered through a browser.
I want to be able to add this component to any java web project to display my table. The problem is that I want to use images in my table to give the appearance of curved corners.
How do I store images in my component and render to a webpage?
Thanks in advance,
Alex

You won't be able to make the install of this library as simple as the installation of a jar file. You can't access the images directly in the jar.
There are a few approaches you can take:
1 - jar file + resources:
Have the install as being a jar and a "resources" directory which you store all the images in. Thus the images become part of the web application/web site and are accessible. Probably need to allow an entry in web.xml to configure where/what this directory is called.
2 - jar file only:
Provide a servlet to access the images, which will load them from the jar file, using the ClassLoader.getResourceAsStream(). Requires declaration of a servlet in the web.xml file. Won't be as efficient as having the images on disk, but will keep them bundled in the jar file.
you would generate code such as <img src="myImgServlet?img=.....">
Cheers,
evnafets

Problem parsing XML with schema when extracted from a jar file

I am having a problem parsing XML with a schema, both of which are extracted from a jar file. I am using using ZipFile to get InputStream objects for the appropriate ZipEntry objects in the jar file. My XML is encrypted so I decrypt it to a temporary file. I am then attempting to parse the temporary file with the schema using DocumentBuilder.parse.
I get the following exception:
org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element '<root element name>'
This was all working OK before I jarred everything (i.e. when I was using standalone files, rather than InputStreams retrieved from a jar).
I have output the retrieved XML to a file and compared it with my original source and they are identical.
I am baffled because the nature of the exception suggests that the schema has been read and parsed correctly but the XML file is not parsing against the schema.
Any suggestions?
The code is as follows:
public void open(File input) throws IOException, CSLXMLException {
    InputStream schema = ZipFileHandler.getResourceAsStream("<jar file name>", "<schema resource name>");
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = null;
    try {
      factory.setNamespaceAware(true);
      factory.setValidating(true);
      factory.setAttribute(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
      factory.setAttribute(JAXP_SCHEMA_SOURCE, schema);
      builder = factory.newDocumentBuilder();
      builder.setErrorHandler(new CSLXMLParseHandler());
    } catch (Exception builderException) {
      throw new CSLXMLException("Error setting up SAX: " + builderException.toString());
    Document document = null;
    try {
      document = builder.parse(input);
    } catch (SAXException parseException) {
      throw new CSLXMLException(parseException.toString());
    }

I was originally using getSystemResource, which worked fine until I jarred the application. The problem appears to be that resources returned from a jar file cannot be used in the same way as resources returned directly from the file system. You have to use the ZipFile class (or its JarFile subclass) to locate the ZipEntry in the jar file and then use ZipFile.getInputStream(ZipEntry) to convert this to an InputStream. I have seen example code where an InputStream is used for the JAXP_SCHEMA_SOURCE attribute but, for some reason, this did not work with the InputStream returned by ZipFile.getInputStream. Like you, I have also seen examples that use a URL but they appear to be URL's that point to a file not URL's that point to an entry in a jar file.
Maybe there is another way around this but writing to a file works and I set use File.deleteOnExit() to ensure things are tidied afterwards.

How to retrieve am image from database

hi ,
i hav a requirement that, i hav to store and retrive an image from database(postgresql)and palce it on JLabel.i successfully stored an image into database .while retrieving an image from database im not getting the image .please any one can help me how to retrieve an image and place it in JLabel.
This the code for inserting an image:
Class.forName("org.postgresql.Driver");
Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:port/database", "username", "pwd");
System.out.println("Connection established");
String INSERT_PICTURE = "insert into imagedata(imageid,data) values (?, ?)";
FileInputStream fis = null;
PreparedStatement ps = null;
try {
conn.setAutoCommit(false);
File file = new File("photo.jpg");
fis = new FileInputStream(file);
ps = conn.prepareStatement(INSERT_PICTURE);
ps.setInt(1, 2);
ps.setBinaryStream(2, fis, (int) file.length());
ps.executeUpdate();
conn.commit();
catch(Exception ex)
ex.printStackTrace();
finally {
ps.close();
fis.close();This is the code for retrieve an image :
Class.forName("org.postgresql.Driver");
Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:port/database", "username", "pwd");
byte[] imgbytes = null;
String INSERT_PICTURE = "select imageid,data from imagedata ";
Statement stmt=(Statement) conn.createStatement();
try {
ResultSet rs=stmt.executeQuery(INSERT_PICTURE);
while(rs.next())
System.out.println(rs.getString(1));
InputStream file=rs.getBinaryStream(2);
System.out.println("FILE : "+file);
catch(SQLException a)
finally {
stmt.close();please anyone can help meee
thanks

You basically save a File to the database, so you can just re-write the data from the file back temporarily and load it into the application using the ImageIO class
// create necessary connection and statement objects
// retrieve image column
ResultSet rs = stmt.executeQuery("SELECT Image FROM dataTable");
rs.next();
Blob imageData = rs.getBlob("Image");
if( imageData != null ) {
    try {
        File tmpFile = new File("tmpImage");
        FileOutputStream fos = new FileOutputStream(tmpFile);
            fos.write( imageData.getBytes(1L, (int)imageData.length()) );
            fos.close();
        tmpFile.deleteOnExit();
        ImageIcon icon = new ImageIcon( ImageIO.read(tmpFile) );
        JOptionPane.showMessageDialog(null, icon);
    } catch(IOException ioe) {
        ioe.printStackTrace();
        JOptionPane.showMessageDialog(null, "Failed To Load Image Data", "Load Error",
                JOptionPane.ERROR_MESSAGE);
}ICE

Figuring out how to extract images from a PDF file

Hi,
I'm trying to write a small app that extracts all images from a PDF file. I already wrote a nice parser and it works good but the only problem is that I can't quite figure out from the reference how to decode all images in a PDF file to normal files such as tiffs, jpegs, bmps etc. For now I'm focusing on XObject images and not dealing with inline images.
From what I understand so far just by trying and looking at open sources I figured that if I see a XObject Image with a DCTDecode filter, taking the stream data without doing anything to it and saving it as a jpeg file works. But doing the same to FlateDecoded streams or CCITTFax didn't work.
What is the right way to properly extract the images?

In general you have to
* decode the stream
* extract the pixel data
* use ColorSpace, BitsPerComponent, Decode and Width to unpack pixel
values
* reconstruct an image file format according to its specification
There are no other shortcuts. The DCTDecode shortcut (which doesn't
work for CMYK JPEG files) is just a piece of fantastic good luck.
Aandi Inston

Reading an xml file from a jar file

Short question:
Is it possible to read an xml file from a jar file when the dtd is
placed inside the jar file? I am using jdom (SAXBuilder) and the default
sax parser which comes with it.
Long Question:
I am trying to create an enterprise archive file on Weblogic 6.1. We
have a framework that is similar to the struts framework which uses it's
own configuration files
I could place the dtd files outside the jar ear file and specify the
absolute path in an environment variable in web.xml which is
configurable through the admin console.
But I want to avoid this step and specify a relative path within the jar
file.
I have tried to use a class which implements the entityresolver as well
as try to extend the saxparser and set the entity resolver within this
class explicitly, but I always seem to sun into problems like:
The setEntityresolver method does not get called or there is a
classloader problem. i.e. JDOM complains that it cannot load My custom
parser which is part of the application
Vijay

Please contact the main BEA Support team [email protected]
They will need to check with product support to determine
the interoperatablity of Weblogic Server with these other
products.

Urgent help for processing XML stream read from a JAR file

Hi, everyone,
Urgently need your help!
I am reading an XML config file from a jar file. It can print out the result well when I use the following code:
===============================================
InputStream is = getClass().getResourceAsStream("conf/config.xml");
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = br.readLine()) != null) {
System.out.println(line); // It works fine here, which means that the inputstream is correct
// process the XML stream I read from above
NodeIterator ni = processXPath("//grid/gridinfo", is);
Below is the processXPath() function I have written:
public static NodeIterator processXPath(String xpath, InputStream byteStream) throws Exception {
// Set up a DOM tree to query.
InputSource in = new InputSource(byteStream);
DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
dfactory.setNamespaceAware(true);
Document doc = dfactory.newDocumentBuilder().parse(in);
// Use the simple XPath API to select a nodeIterator.
System.out.println("Querying DOM using " + xpath);
NodeIterator ni = XPathAPI.selectNodeIterator(doc, xpath);
return ni;
It gives me so much errors:
org.xml.sax.SAXParseException: The root element is required in a well-formed doc
ument.
at org.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1213
at org.apache.xerces.framework.XMLDocumentScanner.reportFatalXMLError(XM
LDocumentScanner.java:570)
at org.apache.xerces.framework.XMLDocumentScanner$XMLDeclDispatcher.endO
fInput(XMLDocumentScanner.java:790)
at org.apache.xerces.framework.XMLDocumentScanner.endOfInput(XMLDocument
Scanner.java:418)
at org.apache.xerces.validators.common.XMLValidator.sendEndOfInputNotifi
cations(XMLValidator.java:712)
at org.apache.xerces.readers.DefaultEntityHandler.changeReaders(DefaultE
ntityHandler.java:1031)
at org.apache.xerces.readers.XMLEntityReader.changeReaders(XMLEntityRead
er.java:168)
at org.apache.xerces.readers.UTF8Reader.changeReaders(UTF8Reader.java:18
2)
at org.apache.xerces.readers.UTF8Reader.lookingAtChar(UTF8Reader.java:19
7)
at org.apache.xerces.framework.XMLDocumentScanner$XMLDeclDispatcher.disp
atch(XMLDocumentScanner.java:686)
at org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentS
canner.java:381)
at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1098)
at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.
java:195)
at processXPath(Unknown Source)
Thank you very much!
Sincerely Yours
David

org.xml.sax.SAXParseException: The root element is required in a well-formed document.This often means that the parser can't find the document. You think it should be able to find the document because your test code could. However if your test code was not in the same package as your real (failing) code, your test is no good because getResourceAsStream("conf/config.xml") is looking for that file name relative to the package of the class that contains that line of code.
If your test code wasn't in any package, put a slash before the filename and see if that works.

Running scripts, bat files, etc from a jar file

Hello,
Does anyone know of a way, or even if it is possible to run a script or batch file from a jar file?
For instance, lets say I have a batch file that I can run from the command prompt by typing :
myBatchFile.bat
and now I write a very simple java app that will do the same:
public class Test {
public static void main(String[] args) {
try {
Runtime rt = Runtime.getRuntime();
Process p = rt.exec(�myBatchFile.bat�);
} catch (Exception e) {
e.getMessage();
The above app will work as long as the batch file is in the current directory, but how or can I make it work if I stick the batch file in a jar file along with the app?
I tried using the manifest file with no luck.
I tried creating a URI to the jar file, wrapping it in a File and then passing that File to the exec method also with no luck.
I searched all the forums on Sun but came up with nothing.
I performed a google search also with no luck.
Does anyone have the answer to this? Even if I can get a definitive �No it can�t be done� answer. Although I would think that it should be able to be done.
Thanks

Hi,
you cannot execute anything being inside a jar-file. The OS doesn't know anythig about jar-files and cannot look inside one to find the program/script/batch you want to execute.
You could do a workaround by extracting the file from the jar-file before calling exec(). But normally OS dependent files should not be inside a jar-file and remain in a own directiory.
Andre

Is it possible to load classes from a jar file

Using ClassLoader is it possible to load the classes from a jar file?

URL[] u = new URL[1] ;
u[0] = new URL( "file://" + jarLocation + jarFileName + "/" );
URLClassLoader jLoader = new URLClassLoader( u );
Object clsName = jLoader.loadClass( clsList.elementAt(i).toString() ).newInstance();
I get this error message.
java.lang.ClassNotFoundException: ExceptionTestCase
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
// "file://" + fileLocation + fileName + "/" This works fine from a browser.
Is there anything I am missing? Thanks for the reply.

? SplashScreen - retrieving an image from a jar file ?

Similar Messages

Maybe you are looking for