JAVA EE: Java Tutorial : Java IO (Java File - How to decompress files from a ZIP file

Thursday 24 November 2016

Java Tutorial : Java IO (Java File - How to decompress files from a ZIP file - unzip)

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Java Tutorial : Java IO (Java File - How to decompress files from a ZIP file - unzip)

UnZipDemo.java

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class UnZipDemo
{
    private static final String INPUT_ZIP_FILE = "D:/work/Java.zip";
    private static final String OUTPUT_FOLDER = "D:/work/java";

    public static void main(String[] args) throws IOException
    {
        UnZipDemo unZipDemo = new UnZipDemo();
        unZipDemo.unZip(INPUT_ZIP_FILE, OUTPUT_FOLDER);
    }

    public void unZip(String zipFile, String outputFolder) throws IOException
    {

        createDir(outputFolder);

        /*
         * If the Streams are within the
         * "try-With-Resources" block, then it will be
         * closed automatically.
         */
        try (
                // Get the zip file content
                ZipInputStream zis = new ZipInputStream(new FileInputStream(
                                                                        zipFile)))
        {
            // Get the zipped file list entry
            ZipEntry ze = zis.getNextEntry();
            byte[] buffer = new byte[1024];
            while (ze != null)
            {

                String fileName = ze.getName();
                File newFile = new File(outputFolder + File.separator
                                                                + fileName);

                System.out.println("file unzip : " + newFile.getAbsoluteFile());

                /*
                 * Create all non exists folders
                 */
                new File(newFile.getParent()).mkdirs();

                FileOutputStream fos = new FileOutputStream(newFile);

                int len;
                while ((len = zis.read(buffer)) > 0)
                {
                    fos.write(buffer, 0, len);
                }

                fos.close();
                ze = zis.getNextEntry();
            }

            zis.closeEntry();

            System.out.println("Unzip is completed..");
        }

    }

    private void createDir(String outputFolder)
    {
        /*
         * Create output directory is not exists
         */
        File folder = new File(outputFolder);
        if (!folder.exists())
        {
            folder.mkdir();
        }
    }
}

Output

file unzip : D:\work\java\CityInfoDemo\.classpath
file unzip : D:\work\java\CityInfoDemo\.project
file unzip : D:\work\java\CityInfoDemo\.settings\.jsdtscope
---
---
file unzip : D:\work\java\CityInfoDemo\WebContent\WEB-INF\web.xml
Unzip is completed..