Java code to get the list of file name from a folder

Question

I have a scenario where around 5600 files are present. I am able to retrieve the file names by using the below code:

 String path = "D:\\Projects worked upon\\ANZ\\Anz new\\Files\\329703588_20160328124733595\\Output"; String files;

        File folder = new File(path);
        File[] listOfFiles = folder.listFiles(); 

        for (int i = 0; i < listOfFiles.length; i++) 
        {
            if (listOfFiles[i].isFile()) 
         {
         files = listOfFiles[i].getName();
             if (files.toLowerCase().endsWith(".xml"))
             {
                System.out.println(files);

              }

, but i need only the first part For Eg:if the file name in folder is "abc_Transformed.xml" , i require only abc .. How to get it ?

Look into split example http://stackoverflow.com/questions/3481828/how-to-split-a-string-in-java — Ganesh Rao B, Mar 29 '16 at 05:51
1) `s.split("_")[0]`. 2) `s.substring(0, s.indexOf('_'))`. 3) regex: `(.*?)_` — Andreas, Mar 29 '16 at 05:51

score 0 · Answer 1 · answered Mar 29 '16 at 05:50

You can use the substring method to find first string.

 if (files.toLowerCase().endsWith(".xml"))
             {
                String result = files.substring(0, files.indexOf("_"));
                System.out.println(result);               
              }

your whole code

 String path = "D:\\Projects worked upon\\ANZ\\Anz new\\Files\\329703588_20160328124733595\\Output"; String files;     
        File folder = new File(path);
        File[] listOfFiles = folder.listFiles();      
        for (int i = 0; i < listOfFiles.length; i++) 
        { 
         if (listOfFiles[i].isFile()) 
          { 
             files = listOfFiles[i].getName();
             if (files.toLowerCase().endsWith(".xml"))
             { 
               String result = files.substring(0, files.indexOf("_"));
               System.out.println(result);      
              }

dave · Answer 2 · 2016-03-29T05:57:19.377

The information about the files is basically irrelevant. You are after some basic String manipulation functions.

You could try something using String.split() like:

String[] pieces = files.split("_");
String first = pieces[0];   // should be equal to "abc"

Or something using String.indexOf() and String.substr() like:

int indexOfUnderscore = files.indexOf("_");
String first = files.substr(0, indexOfUnderscore); // should be equal to "abc"

If you're new to Java, it's worth spending the time to review all the String functions.

Java code to get the list of file name from a folder

2 Answers2