Extracts zip file into a directory, if destination file is not exist, it will create it then. - Java File Path IO

Java examples for File Path IO:Zip File

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Description

Extracts zip file into a directory, if destination file is not exist, it will create it then.

Demo Code


import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

public class Main{
    /**//from  w  w w.  jav a  2  s . c o  m
     * Size of the buffer to read/write data
     */
    private static final int BUFFER_SIZE = 4096;
    /**
     * Extracts zip file into a directory, if destination file is not exist, it will create it then.
     * 
     * @param zipFile file to be unzip
     * @param destDirectory folders to save unziped files
     * @throws IOException
     */
    public static boolean unzip(File zipFile, String destDirectory) {
        ZipInputStream zipIn = null;
        try {
            zipIn = new ZipInputStream(new FileInputStream(zipFile));
            ZipEntry entry = zipIn.getNextEntry();
            // iterates over entries in the zip file
            while (entry != null) {
                String filePath = destDirectory + File.separator
                        + entry.getName();
                if (!entry.isDirectory()) {
                    // if the entry is a file, extracts it
                    extractFile(zipIn, filePath);
                } else {
                    // if the entry is a directory, make the directory
                    File dir = new File(filePath);
                    dir.mkdir();
                }
                zipIn.closeEntry();
                entry = zipIn.getNextEntry();
            }
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        } finally {
            if (zipIn != null) {
                try {
                    zipIn.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    /**
     * Unzip file retrived from input stream into directory.
     * 
     * @param inputStream
     *            input stream of zip file
     * @param destDirectory
     *            directory to save unziped files
     * @throws IOException
     */
    public static boolean unzip(InputStream inputStream,
            String destDirectory) {
        File destDir = new File(destDirectory);
        if (!destDir.exists()) {
            destDir.mkdir();
        }
        ZipInputStream zipIn = null;
        try {
            zipIn = new ZipInputStream(inputStream);
            ZipEntry entry = zipIn.getNextEntry();

            // iterates over entries in the zip file
            while (entry != null) {
                String filePath = destDirectory + File.separator
                        + entry.getName();
                if (!entry.isDirectory()) {
                    // if the entry is a file, extracts it
                    extractFile(zipIn, filePath);
                } else {
                    // if the entry is a directory, make the directory
                    File dir = new File(filePath);
                    dir.mkdir();
                }
                zipIn.closeEntry();
                entry = zipIn.getNextEntry();
            }
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
                zipIn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    /**
     * Extracts a zip entry (file entry)
     * 
     * @param zipIn
     * @param filePath
     * @throws IOException
     */
    private static void extractFile(ZipInputStream zipIn, String filePath)
            throws IOException {
        FileUtils.createFile(filePath);//create empty file
        BufferedOutputStream bos = new BufferedOutputStream(
                new FileOutputStream(filePath));
        byte[] bytesIn = new byte[BUFFER_SIZE];
        int read = 0;
        while ((read = zipIn.read(bytesIn)) != -1) {
            bos.write(bytesIn, 0, read);
        }
        bos.close();
    }
}

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