Recursively list files in Java

Question

How do I recursively list all files under a directory in Java? Does the framework provide any utility?

I saw a lot of hacky implementations. But none from the fra

Answer 1

Based on stacker answer. Here is a solution working in JSP without any external libraries so you can put it almost anywhere on your server:

<%@ page session="false" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%@ page contentType="text/html; charset=UTF-8" %>

<%!
    public List files = new ArrayList();
    /**
        Fills files array with all sub-files.
    */
    public void walk( File root ) {
        File[] list = root.listFiles();

        if (list == null) return;

        for ( File f : list ) {
            if ( f.isDirectory() ) {
                walk( f );
            }
            else {
                files.add(f.getAbsolutePath());
            }
        }
    }
%>
<%
    files.clear();
    File jsp = new File(request.getRealPath(request.getServletPath()));
    File dir = jsp.getParentFile();
    walk(dir);
    String prefixPath = dir.getAbsolutePath() + "/";
%>

Then you just do something like:

    

        <% for (String file : files) { %>
            <% if (file.matches(".+\\.(apk|ipa|mobileprovision)")) { %>
                
<%=file.replace(prefixPath, "")%>
            <% } %>
        <% } %>