Java Unzip to Folder unzip(String zip, String folder)

Description

Unzips the given zip file into the given folder retaining the folder structure of the zip.

License

Open Source License

Parameter

Parameter	Description
zip	the zip to unzip
folder	the folder to place the contents of the zip

Exception

Parameter	Description
ZipException	thrown if the zip file is invalid
FileNotFoundException	thrown if the given file is not found
IOException	thrown if an IO error occurs
IllegalStateException	thrown if the zip file is closed prematurely
SecurityException	thrown if a security check fails

Declaration

public static final void unzip(String zip, String folder)
        throws ZipException, FileNotFoundException, IOException, IllegalStateException, SecurityException 

Method Source Code

//package com.java2s;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

public class Main {
    /** The local buffer size */
    private static final int BUFFER_SIZE = 1024;

    /**/*  w ww.  java  2s .co  m*/
     * Unzips the given zip file into the given folder retaining the folder structure of the zip.
     * <p>
     * This method does not use the name of the zip file as the top level folder.
     * @param zip the zip to unzip
     * @param folder the folder to place the contents of the zip
     * @throws ZipException thrown if the zip file is invalid
     * @throws FileNotFoundException thrown if the given file is not found
     * @throws IOException thrown if an IO error occurs
     * @throws IllegalStateException thrown if the zip file is closed prematurely
     * @throws SecurityException thrown if a security check fails
     */
    public static final void unzip(String zip, String folder)
            throws ZipException, FileNotFoundException, IOException, IllegalStateException, SecurityException {
        // verify input
        if (zip == null || zip.length() == 0 || folder == null || folder.length() == 0) {
            // in any of these cases just silently return
            return;
        }

        // get a file reference to the zip
        try (ZipFile zipFile = new ZipFile(zip)) {
            // get all the entries
            Enumeration<? extends ZipEntry> entries = zipFile.entries();

            // loop through all the entries
            while (entries.hasMoreElements()) {
                // get the entry
                ZipEntry entry = entries.nextElement();
                String currentEntry = entry.getName();
                File destFile = new File(folder, currentEntry);
                File destinationParent = destFile.getParentFile();

                // create the path if necessary
                destinationParent.mkdirs();

                // check for file type
                if (!entry.isDirectory()) {
                    int bytesRead;
                    // establish buffer for writing file
                    byte data[] = new byte[BUFFER_SIZE];

                    // read the entry and write it to the location
                    try (BufferedInputStream is = new BufferedInputStream(zipFile.getInputStream(entry));
                            FileOutputStream fos = new FileOutputStream(destFile);
                            BufferedOutputStream dest = new BufferedOutputStream(fos, BUFFER_SIZE);) {
                        // read and write until last byte is encountered
                        while ((bytesRead = is.read(data, 0, BUFFER_SIZE)) != -1) {
                            dest.write(data, 0, bytesRead);
                        }
                    }
                }
            }
        }
    }
}

Related

1. unzip(String sourceZip, String targetDirectory)
2. unzip(String src, String dest, PrintStream stream)
3. unzip(String sZip)
4. unzip(String toUnpackName)
5. unzip(String zip, String dest)
6. unzip(String zip, String path)
7. unzip(String zip, String unzipDir, int bufferSize)
8. Unzip(String zipFile, String outputDirectory)
9. unzip(String zipFile, String targetFolder)