Java Zip File Check isZipFile(File file)

Description

is Zip File

License

Apache License

Return

true if the file is a zip/jar file

Declaration

public static boolean isZipFile(File file) 

Method Source Code

//package com.java2s;
/*// w  w  w.  j av  a 2s  . co m
 * Copyright 2012 dorkbox, llc
 *
 * 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;

import java.io.IOException;

import java.io.RandomAccessFile;

public class Main {
    public static byte[] ZIP_HEADER = { 80, 75, 3, 4 };

    /**
     * @return true if the file is a zip/jar file
     */
    public static boolean isZipFile(File file) {
        boolean isZip = true;
        byte[] buffer = new byte[ZIP_HEADER.length];

        RandomAccessFile raf = null;
        try {
            raf = new RandomAccessFile(file, "r");
            raf.readFully(buffer);
            for (int i = 0; i < ZIP_HEADER.length; i++) {
                if (buffer[i] != ZIP_HEADER[i]) {
                    isZip = false;
                    break;
                }
            }
        } catch (Exception e) {
            isZip = false;
        } finally {
            if (raf != null) {
                try {
                    raf.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return isZip;
    }
}

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)