Winrar Java

How to Use WinRAR Java to Compress and Decompress Files in Java

WinRAR Java is a library that allows you to use the popular WinRAR compression and decompression tool in your Java applications. WinRAR Java can help you create and extract RAR, ZIP, and other archive formats with ease and efficiency. In this article, we will show you how to use WinRAR Java to compress and decompress files in Java.

How to Install WinRAR Java

Before you can use WinRAR Java, you need to install it on your system. You can download WinRAR Java from https://www.rarlab.com/download.htm. Choose the version that matches your operating system and architecture. For example, if you are using Windows 10 64-bit, you can download the file winrar-x64-610.exe.

Winrar Java

Download File

After downloading the file, run it and follow the instructions to install WinRAR Java on your system. You will need to accept the license agreement and choose the destination folder for the installation. You can also customize the options for file associations, shell integration, and shortcuts.

Once the installation is complete, you will have WinRAR Java on your system. You can verify it by opening a command prompt and typing winrar -?. You should see a list of commands and options for using WinRAR Java.

How to Compress Files with WinRAR Java

To compress files with WinRAR Java, you need to use the WinrarArchiveOutputStream class. This class allows you to create an archive file and add files or directories to it. Here is an example of how to use it:

import com.github.junrar.Archive;

import com.github.junrar.rarfile.FileHeader;

import com.github.junrar.io.WinrarArchiveOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

public class CompressExample

public static void main(String[] args)

// Create a new archive file

File archiveFile = new File("example.rar");

try (WinrarArchiveOutputStream out = new WinrarArchiveOutputStream(new FileOutputStream(archiveFile)))

// Set the compression level (0-5)

out.setLevel(5);

// Add a file to the archive

File file1 = new File("test.txt");

out.addFile(file1);

// Add a directory to the archive

File dir1 = new File("images");

out.addDirectory(dir1);

// Close the archive

out.close();

catch (IOException e)

e.printStackTrace();

This code will create an archive file called example.rar in the current directory. It will add a file called test.txt and a directory called images to the archive. It will also set the compression level to 5, which is the highest level of compression.

How to Decompress Files with WinRAR Java

To decompress files with WinRAR Java, you need to use the Archive class. This class allows you to open an archive file and extract files or directories from it. Here is an example of how to use it:

import com.github.junrar.Archive;

import com.github.junrar.rarfile.FileHeader;

import com.github.junrar.io.WinrarArchiveOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

public class DecompressExample {

public static void main(String[] args) {

// Open an existing archive file

File archiveFile = new File("example.rar");

try (Archive archive = new Archive(archiveFile)) {

// Get the list of files in the archive

List headers = archive.getFileHeaders();

// Loop through the files

for (FileHeader header : headers) {

// Get the name of the file

String fileName = header.getFileNameString();

// Get the size of the file

long fileSize = header.getFullUnpackSize();

// Create a new file object

File outputFile = new File(fileName);

// Create a new output stream

try (

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