Using java to extract .rar files

user_1442655 0
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I am looking a ways to unzip .rar files using Java and where ever I search i keep ending up with the same tool - JavaUnRar. I have been looking into unzipping .rar files with this but all the ways i seem to find to do this are very long and awkward like in this example

I am currently able to extract .tar, .tar.gz, .zip and .jar files in 20 lines of code or less so there must be a simpler way to extract .rar files, does anybody know?

Just if it helps anybody this is the code that I am using to extract both .zip and .jar files, it works for both

 public void getZipFiles(String zipFile, String destFolder) throws IOException {
    BufferedOutputStream dest = null;
    ZipInputStream zis = new ZipInputStream(
                                       new BufferedInputStream(
                                             new FileInputStream(zipFile)));
    ZipEntry entry;
    while (( entry = zis.getNextEntry() ) != null) {
        System.out.println( "Extracting: " + entry.getName() );
        int count;
        byte data[] = new byte[BUFFER];

        if (entry.isDirectory()) {
            new File( destFolder + "/" + entry.getName() ).mkdirs();
            continue;
        } else {
            int di = entry.getName().lastIndexOf( '/' );
            if (di != -1) {
                new File( destFolder + "/" + entry.getName()
                                             .substring( 0, di ) ).mkdirs();
            }
        }
        FileOutputStream fos = new FileOutputStream( destFolder + "/"
                                                     + entry.getName() );
        dest = new BufferedOutputStream( fos );
        while (( count = zis.read( data ) ) != -1) 
            dest.write( data, 0, count );
        dest.flush();
        dest.close();
    }
}
rar extract java
4 Answers

You can use the library junrar

<dependency>
   <groupId>com.github.junrar</groupId>
   <artifactId>junrar</artifactId>
   <version>0.7</version>
</dependency>

Code example:

            File f = new File(filename);
            Archive archive = new Archive(f);
            archive.getMainHeader().print();
            FileHeader fh = archive.nextFileHeader();
            while(fh!=null){        
                    File fileEntry = new File(fh.getFileNameString().trim());
                    System.out.println(fileEntry.getAbsolutePath());
                    FileOutputStream os = new FileOutputStream(fileEntry);
                    archive.extractFile(fh, os);
                    os.close();
                    fh=archive.nextFileHeader();
            }
user_79074930

You can use http://sevenzipjbind.sourceforge.net/index.html

In addition to supporting a large number of archive formats, version 16.02-2.01 has full support for RAR5 extraction with:

  • password protected archives
  • archives with encrypted headers
  • archives splitted in volumes

gradle

implementation 'net.sf.sevenzipjbinding:sevenzipjbinding:16.02-2.01'
implementation 'net.sf.sevenzipjbinding:sevenzipjbinding-all-platforms:16.02-2.01'

or maven

<dependency>
    <groupId>net.sf.sevenzipjbinding</groupId>
    <artifactId>sevenzipjbinding</artifactId>
    <version>16.02-2.01</version>
</dependency>
<dependency>
    <groupId>net.sf.sevenzipjbinding</groupId>
    <artifactId>sevenzipjbinding-all-platforms</artifactId>
    <version>16.02-2.01</version>
</dependency>

And code example


import net.sf.sevenzipjbinding.ExtractOperationResult;
import net.sf.sevenzipjbinding.IInArchive;
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
import net.sf.sevenzipjbinding.simple.ISimpleInArchiveItem;

import java.io.*;
import java.util.HashMap;
import java.util.Map;

/**
 * Responsible for unpacking archives with the RAR extension.
 * Support Rar4, Rar4 with password, Rar5, Rar5 with password.
 * Determines the type of archive itself.
 */
public class RarExtractor {

    /**
     * Extracts files from archive. Archive can be encrypted with password
     *
     * @param filePath path to .rar file
     * @param password string password for archive
     * @return map of extracted file with file name
     * @throws IOException
     */
    public Map<InputStream, String> extract(String filePath, String password) throws IOException {
        Map<InputStream, String> extractedMap = new HashMap<>();

        RandomAccessFile randomAccessFile = new RandomAccessFile(filePath, "r");
        RandomAccessFileInStream randomAccessFileStream = new RandomAccessFileInStream(randomAccessFile);
        IInArchive inArchive = SevenZip.openInArchive(null, randomAccessFileStream);

        for (ISimpleInArchiveItem item : inArchive.getSimpleInterface().getArchiveItems()) {
            if (!item.isFolder()) {
                ExtractOperationResult result = item.extractSlow(data -> {
                    extractedMap.put(new BufferedInputStream(new ByteArrayInputStream(data)), item.getPath());

                    return data.length;
                }, password);

                if (result != ExtractOperationResult.OK) {
                    throw new RuntimeException(
                            String.format("Error extracting archive. Extracting error: %s", result));
                }
            }
        }

        return extractedMap;
    }
}

P.S. @BorisBrodski https://github.com/borisbrodski Happy 40th birthday to you! Hope you had a great celebration. Thanks for your work!

user_77896810
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