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Thread: List all directories under a given directory

  1. #1
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    Default List all directories under a given directory

    import java.util.HashMap;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
     
    //save this code to listreps.java
    //compile with >javac -Xlint listreps.java
    //example run with >java listreps c:/windows
    //the above command will list recursively all directories under the windows directory
    //I tested it on my windows directory and it listed more than 30000 sub directories.
     //So please wait that the program finishes.
     
    class rept{
    private long cnt=0;
    private String dirIn="";
    private HashMap hm = new HashMap(0,90000);
     
    void setDir(String dr){
    	dirIn=dr.replace("\\","/");
     
    }
     
     
    HashMap getReps(){
            long bk=0;
            cnt=0;
            String newline = System.getProperty("line.separator");
     
    try{
    	FileWriter facd = new FileWriter("c:/outdirs/da/da.txt",true);//path of file where directories that could not be opened are listed
    	while(true){ //4
    	   	try{
    			String listf[] = new File(dirIn).list();
    			int nlistf = listf.length;
    		     if(nlistf>0){ //3
    			       FileWriter filrep = new FileWriter("c:/outdirs/testdirs.txt",true);//path of file where directories are listed
    			       int flg=0;
    			         for(int i=0;i<nlistf;i++){ //2
    				        String pth = dirIn+"/"+listf[i];
    			   	       if(new File(pth).isDirectory()){ //1
    					         cnt=cnt+1;
    				           filrep.write(newline+cnt+","+pth);
     
    					         hm.put(cnt,pth);
    					         flg=1;
    				          }//end 1
     
    			         }//end 2
    				  filrep.close();
     
    		    }//end 3
     
    		   }catch(NullPointerException ne){
    	        	facd.write(newline+"bk="+bk+" - dirIn="+ dirIn);
    		   }catch(IOException ie){
    		   }//end catchs(ne,ie)
     
    		bk=bk+1;
    		if(bk==cnt+1) break;
     
    		dirIn=(String) hm.get(bk);		
    		}//end 4
     
    		facd.close();
     
       }catch(IOException ioe){
    	    hm.put(0,"file da not closed!");
       }//end catchs(ioe)
     
    return hm;
    }//end getReps
     
     
    long getCntreps(){
    	return cnt;
    }//end getCntrep
     
    }//end class rept
     
     
    public class listreps{
    public static void main(String args[]){
    	rept rp=new rept();
    	rp.setDir(args[0]);
    	HashMap ham=rp.getReps();
     
    	long cntreps=rp.getCntreps();
     
    System.out.println("Total number of directories="+cntreps);
    ham.clear();	
    }//end main
    }//end class listreps
    Last edited by paulngom; May 7th, 2014 at 03:55 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: List all directories under a given directory

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    paulngom (May 7th, 2014)

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