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The package java.util.zip provides support to compress and decompress files in Zip and Gzip formats.

Here's an example to compress a zip file:

	try(
		// Open input stream
		FileInputStream fis = new FileInputStream("C:/test.txt");

		// Open output stream
		FileOutputStream fos = new FileOutputStream("C:/test.zip");
		ZipOutputStream zos = new ZipOutputStream(fos);
	) {
		zos.putNextEntry(new ZipEntry("test.txt"));		

		byte[] b = new byte[1024];
		int count = 0;

		// Compress file
		while ((count = fis.read(b)) > 0) {
			System.out.println();
			zos.write(b, 0, count);
		}
	}

Here's an example to decompress the same zip file:

		
	try(
		// Open input stream
		FileInputStream fis = new FileInputStream("C:/test.zip");
		BufferedInputStream bis = new BufferedInputStream(fis);
		ZipInputStream zis = new ZipInputStream(bis);
		
		// Open output stream
		FileOutputStream fos = new FileOutputStream("C:/test.txt");
	) {
		// Find file to decompress
		ZipEntry ze = null;
		while ((ze = zis.getNextEntry()) != null) {
			if (ze.getName().equals("test.txt")) {
			
				// Decompress file
				byte[] buffer = new byte[8192];
				int len = 0;
				while ((len = zis.read(buffer)) != -1) {
					fos.write(buffer, 0, len);
				}
			}
		}
	}