JAR FINDER

While working on application, i always find the need to search directories containing all the jars to find a particular class file. So here is java code to search jars files from specified directory to find a class file.


Usage : java JarFind /usr/home/tomcat AuthenticatorBase.class

This will search AuthenticatorBase.class in all the jar files inside /usr/home/tomcat and display the result of all the match.

This is simple yet useful, at least i felt it is useful ;)

import java.io.File;
import java.util.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class JarFind {

 public static ArrayList arraylist = new ArrayList();

 public static void searchDir(String s, String s1) throws Exception {

  File file = new File(s);
  if (!file.exists() || !file.isDirectory()) {
   System.out.println("Error cannot find the folder specified");

   System.out.println(":)");
   System.exit(0);
  }
  File afile[] = file.listFiles();
  for (int i = 0; i < afile.length; i++)
   if (!afile[i].isDirectory() && afile[i].getName().endsWith(".jar")) {
    JarFile jarfile = new JarFile(afile[i]);
    System.out.println("Scanning jar :" + afile[i]);
    Enumeration enumeration = jarfile.entries();
    do {
     if (!enumeration.hasMoreElements())
      break;
     String s2 = enumeration.nextElement().toString();
     s2 = s2.replace('/', '.');
     if (s2.indexOf(s1) != -1
       && !arraylist.contains(afile[i].getPath()))
      arraylist.add("Jar :" + afile[i].getPath()
        + " FileName :" + s2);
    } while (true);
   } else if (afile[i].isDirectory())
    searchDir(afile[i].getPath(), s1);

 }

 public static void main(String args[]) throws Exception {
  if (args.length < 2) {
   System.out.println("Format: JarFind rootfolder pattern");
   System.exit(0);
  }
  String s = args[0];
  String s1 = args[1];
  searchDir(s, s1);
  System.out.println("");
  System.out.println("");
  System.out.println("");
  System.out.println("------------------");
  System.out.println(arraylist.size() + " Result Found");
  System.out.println("------------------");
  System.out.println("");

  for (String str : arraylist) {
   System.out.println(str);
  }
 }

 

}