Create Zip File Using ZipEntry and ZipOutputStream in Java

Create Zip File Using ZipEntry and ZipOutputStream in Java

Compress a Whole Directory(including sub files and sub directories)

We can compress Whole Directory including sub files and sub directories using the walk file tree feature of Java NIO

 
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class CreateZip {
	public static void compress(String dirPath) {
		final Path sourceDir = Paths.get(dirPath);
		String zipFileName = dirPath.concat(".zip");
		try {
			final ZipOutputStream outputStream = new ZipOutputStream(new FileOutputStream(zipFileName));
			Files.walkFileTree(sourceDir, new SimpleFileVisitor &lt Path &gt () {@Override
				public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) {
					try {
						Path targetFile = sourceDir.relativize(file);
						outputStream.putNextEntry(new ZipEntry(targetFile.toString()));
						byte[] bytes = Files.readAllBytes(file);
						outputStream.write(bytes, 0, bytes.length);
						outputStream.closeEntry();
					} catch(IOException e) {
						e.printStackTrace();
					}
					return FileVisitResult.CONTINUE;
				}
			});
			outputStream.close();
		} catch(IOException e) {
			e.printStackTrace();
		}
	}
}
  

Create a zip file of single file

String srcFilename = "C:\\hello.txt";
String zipFile = "C:\\hello.zip";

try {
	byte[] buffer = new byte[1024];
	FileOutputStream fos = new FileOutputStream(zipFile);
	ZipOutputStream zos = new ZipOutputStream(fos);
	File srcFile = new File(srcFilename);
	FileInputStream fis = new FileInputStream(srcFile);
	zos.putNextEntry(new ZipEntry(srcFile.getName()));
	int length;
	while ((length = fis.read(buffer)) > 0) {
		zos.write(buffer, 0, length);
	}
	zos.closeEntry();
	fis.close();
	zos.close();
}
catch(IOException ex) {
	System.out.println("Error while creating zip file : " + ex);
}
catch(Exception ex) {
	System.out.println("Error while creating zip file : " + ex);
}
 

In this article, we have seen Create Zip File Using ZipEntry and ZipOutputStream in Java .