Java Ungzip decompressGZIP(String sourceFilename, String targetFilename)

Description

decompress GZIP

License

Apache License

Declaration

public static void decompressGZIP(String sourceFilename, String targetFilename)
            throws FileNotFoundException, IOException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2015 Observational Health Data Sciences and Informatics
 * //from www.  j  a v  a  2 s . c o m
 * 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.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.GZIPInputStream;

public class Main {
    public static void decompressGZIP(String sourceFilename, String targetFilename)
            throws FileNotFoundException, IOException {
        copyStream(new GZIPInputStream(new FileInputStream(sourceFilename)), new FileOutputStream(targetFilename));
    }

    private static final void copyStream(InputStream source, OutputStream dest) {
        int bufferSize = 1024;
        int bytes;
        byte[] buffer;
        buffer = new byte[bufferSize];
        try {
            while ((bytes = source.read(buffer)) != -1) {
                if (bytes == 0) {
                    bytes = source.read();
                    if (bytes < 0)
                        break;
                    dest.write(bytes);
                    dest.flush();
                    continue;
                }
                dest.write(buffer, 0, bytes);
                dest.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Related

1. decompressGzipFile(String gzipFile, String newFile)
2. decompressGzipString(String gzipFile)