Here you can find the source of getMimeType(File file)
public static String getMimeType(File file)
//package com.java2s; /*/*from w ww . j av a 2s .c om*/ * Syncany, www.syncany.org * Copyright (C) 2011 Philipp C. Heckel <philipp.heckel@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.io.*; import java.nio.file.Files; public class Main { public static String getMimeType(File file) { String mimetype = null; try { mimetype = Files.probeContentType(file.toPath()); } catch (IOException ex) { } if (mimetype == null) { mimetype = "unknown"; } return mimetype; } }