Here you can find the source of getCanonicalPath(String filePath, String prefix)
public static final String getCanonicalPath(String filePath, String prefix)
//package com.java2s; /**/* w w w. j a va2 s .co m*/ * Copyright (c) 2010-2011 Martin M Reed * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.io.File; public class Main { public static final String getCanonicalPath(String filePath, String prefix) { if (prefix == null || filePath.equals(prefix) || !filePath.startsWith(prefix)) { return filePath; } int startIndex = prefix.length(); if (filePath.charAt(startIndex) == File.separatorChar) { startIndex++; } return filePath.substring(startIndex); } }