Java Zip File Check isZipFile(File file)

Description

is Zip File

License

Open Source License

Return

Returns true if the given file is a zip file.

Declaration

public static boolean isZipFile(File file) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2010-2015 BSI Business Systems Integration AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:/*from   www.  j  a  v  a 2s  .c om*/
 *     BSI Business Systems Integration AG - initial API and implementation
 ******************************************************************************/

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;

public class Main {
    /**
     * @return Returns <code>true</code> if the given file is a zip file.
     */
    public static boolean isZipFile(File file) {
        if (file == null || file.isDirectory() || !file.canRead() || file.length() < 4) {
            return false;
        }
        try (DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(file)))) {
            int test = in.readInt();
            return test == 0x504b0304; // magic number of a zip file
        } catch (Exception e) {
            return false;
        }
    }
}

Related

1. isZipFile(File file)
2. isZipFile(File file)
3. isZipFile(File file)
4. isZipFile(File file)
5. isZipFile(File file)
6. isZipFile(File file)
7. isZipFile(File file)
8. isZipFile(File file)
9. isZipFile(File file)