Convert ZIP to TAR.GZ in Java Programmatically

Convert-ZIP-to-TAR-GZ.java

package com.example;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import com.aspose.zip.Archive;
import com.aspose.zip.ArchiveEntry;
import com.aspose.zip.TarArchive;
import com.aspose.zip.exceptions.IOException;

public class Main {
	// Convert ZIP to TAR.GZ in Java
	public static void main(String[] args) throws java.io.IOException {

		String dir = "/files/";
		// Create an instance of the Archive class and load the source ZIP file.
		try (Archive source = new Archive(dir+"sample.zip")) {
		// Instantiate an object of the TarArchive class. 	
		try (TarArchive tar = new TarArchive()) {
			// Get the entries of RarArchiveEntry type constituting the rar archive by calling the getEntries method. 
			for (ArchiveEntry entry : source.getEntries()) {
				if (!entry.isDirectory()) {
					ByteArrayOutputStream out = new ByteArrayOutputStream();
					try (java.io.InputStream mem = entry.open()) {
						byte[] b = new byte[8192];
						int bytesRead;
						while (0 < (bytesRead = mem.read(b, 0, b.length))) {
							out.write(b, 0, bytesRead);
						}
					}
					// Invoke the createEntry method to create a single entry within the archive. 
					tar.createEntry(entry.getName(), new ByteArrayInputStream(out.toByteArray()));
				}
			}
			// Save as the TAR.GZ archive by calling the saveGzipped method. 
			tar.saveGzipped(dir+"result.tar.gz");
			}
		} catch (IOException ex) {
			System.out.println(ex);
		}
	}
}