*/import java.io.*;import java.util.*;import java.util.zip.*;/** * JarResources: JarResources maps all resources included in a * Zip or Jar file. Additionaly, it provides a method to extract one * as a blob. */public final class JarResources {   // external debug flag   public boolean debugOn=false;   // jar resource mapping tables   private Hashtable htSizes=new Hashtable();     private Hashtable htJarContents=new Hashtable();   // a jar file   private String jarFileName;   /**    * creates a JarResources. It extracts all resources from a Jar    * into an internal hashtable, keyed by resource names.    * @param jarFileName a jar or zip file    */   public JarResources(String jarFileName) {      this.jarFileName=jarFileName;      init();   }   /**    * Extracts a jar resource as a blob.    * @param name a resource name.    */   public byte[] getResource(String name) {      return (byte[])htJarContents.get(name);   }   /**    * initializes internal hash tables with Jar file resources.    */   private void init() {      try {          // extracts just sizes only.           ZipFile zf=new ZipFile(jarFileName);          Enumeration e=zf.entries();          while (e.hasMoreElements()) {              ZipEntry ze=(ZipEntry)e.nextElement();              if (debugOn) {                 System.out.println(dumpZipEntry(ze));              }              htSizes.put(ze.getName(),new Integer((int)ze.getSize()));          }          zf.close();          // extract resources and put them into the hashtable.          FileInputStream fis=new FileInputStream(jarFileName);          BufferedInputStream bis=new BufferedInputStream(fis);          ZipInputStream zis=new ZipInputStream(bis);          ZipEntry ze=null;          while ((ze=zis.getNextEntry())!=null) {             if (ze.isDirectory()) {                continue;             }             if (debugOn) {                System.out.println(                   "ze.getName()="+ze.getName()+","+"getSize()="+ze.getSize()                   );             }             int size=(int)ze.getSize();             // -1 means unknown size.              if (size==-1) {                size=((Integer)htSizes.get(ze.getName())).intValue();             }             byte[] b=new byte[(int)size];             int rb=0;             int chunk=0;             while (((int)size - rb) > 0) {                 chunk=zis.read(b,rb,(int)size - rb);                 if (chunk==-1) {                    break;                 }                 rb+=chunk;             }             // add to internal resource hashtable             htJarContents.put(ze.getName(),b);             if (debugOn) {                System.out.println(                   ze.getName()+"  rb="+rb+                   ",size="+size+                   ",csize="+ze.getCompressedSize()                   );             }          }       } catch (NullPointerException e) {          System.out.println("done.");       } catch (FileNotFoundException e) {          e.printStackTrace();       } catch (IOException e) {          e.printStackTrace();       }   }   /**    * Dumps a zip entry into a string.    * @param ze a ZipEntry    */   private String dumpZipEntry(ZipEntry ze) {       StringBuffer sb=new StringBuffer();       if (ze.isDirectory()) {          sb.append("d ");        } else {          sb.append("f ");        }       if (ze.getMethod()==ZipEntry.STORED) {          sb.append("stored   ");        } else {          sb.append("defalted ");       }       sb.append(ze.getName());       sb.append("\t");       sb.append(""+ze.getSize());       if (ze.getMethod()==ZipEntry.DEFLATED) {          sb.append("/"+ze.getCompressedSize());       }       return (sb.toString());   }   /**    * Is a test driver. Given a jar file and a resource name, it trys to    * extract the resource and then tells us whether it could or not.    *    * <strong>Example</strong>    * Let's say you have a JAR file which jarred up a bunch of gif image    * files. Now, by using JarResources, you could extract, create, and display    * those images on-the-fly.    * <pre>    *     ...    *     JarResources JR=new JarResources("GifBundle.jar");    *     Image image=Toolkit.createImage(JR.getResource("logo.gif");    *     Image logo=Toolkit.getDefaultToolkit().createImage(    *                   JR.getResources("logo.gif")    *                   );    *     ...    * </pre>    */   public static void main(String[] args) throws IOException {       if (args.length!=2) {          System.err.println(             "usage: java JarResources <jar file name> <resource name>"             );          System.exit(1);       }       JarResources jr=new JarResources(args[0]);       byte[] buff=jr.getResource(args[1]);       if (buff==null) {          System.out.println("Could not find "+args[1]+".");       } else {          System.out.println("Found "+args[1]+ " (length="+buff.length+").");       }   }}	// End of JarResources class.