Jar File Resources

[Gregg Bolinger]

My application is a JAR file and I am needing to get a group of resources all at one time with specifically specifying the file names. I know how to get a single resources, for example. getClass().getClassLoader().getResource("") but I have a directory full of images and I need to get all the image names.

So basically, if I were to do this outside of a JAR file I would do something like:

File dirs = new File("images");
File[] files = dirs.listFiles();

And that would get all my file names in the File[] array. Is there an easy method of doing the same thing from within a JAR? You can't get File objects when your application is running from a JAR because it will look outside the JAR file for those resources.

Thanks.

[Bear Bibeault]

Although I've never used it, perhaps the classes in the java.util.jar package would help you inspect the contents of the jar file.

[Valentin Crettaz]

Hi Gregg,
there is a piece of code over at the Java Almanac that shows you how to list the entries of your JAR file. With that, you can get your images back.

[Fisher Daniel]

Hi,
I dont know if it is proper for your case.
I think you can use classes in package java.util.zip.* to get name and the content of your JAR file.

Correct me if I am wrong

thanks
daniel

[Srinivasa Raghavan]

Hi hope this help's u ...

 
import java.util.jar.*;
import java.io.*;
import java.util.*;
import java.lang.reflect.*;
 
public class SampleJarReader
{
  public static void main(String args[])
  {
    try 
    {
/*
  Use JarFile to load the jar file.
*/
JarFile jarFile = new JarFile( new File(args[0]) );
Enumeration en  = jarFile.entries();
 
/*
        Enumerate all the Jar File entries.
*/
while( en.hasMoreElements() )
{
  /*
    Get JarEntry object.
  */
  JarEntry entry = (JarEntry)en.nextElement();
  String name    = entry.getName();
  int index = name.indexOf(".");
  boolean success = false;
  if( index != -1 ) 
  {
    if( name.substring( index ).equals(".class") ) 
          {
success = true;
String parsedClassName = name.substring(0,index).replace('/','.');/*
        Create object for the specified jar entry.
*/
Class exe = Class.forName( parsedClassName );
System.out.println("\n\n");
if( exe.isInterface() )
{
         System.out.println("Package: "+exe.getPackage().getName());
   Method[] method = exe.getMethods();
   for( int count = 0; count < method.length;count++)
   {
System.out.println("\t\t Method: "+method[count].getName());   } 
} // End of isInterface()
        }
      }
if( success ) break;
     }
   }catch(Exception e)
    {
System.out.println(e.getMessage());
    }
  }
}

 
 

[ November 07, 2004: Message edited by: srini vasan ]