Here you can find the source of getRelativeName(final File directory, final File file)
private static String getRelativeName(final File directory, final File file)
//package com.java2s; /*//from w w w . j a va2 s . c o m * Copyright 2011-2015 B2i Healthcare Pte Ltd, http://b2i.sg * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.File; public class Main { private static String getRelativeName(final File directory, final File file) { final String name = directory.toURI().relativize(file.toURI()).getPath(); if (file.isDirectory()) { // URI always uses forward slashes (http://www.ietf.org/rfc/rfc1738.txt), regardless of platform, therefore the OS specific file separator // on windows ('\' character) is not working in this case return name.endsWith("/") ? name : name + "/"; } return name; } }