Java tutorial
import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.OutputStream; import java.util.Date; import java.util.zip.CRC32; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; public class Main { public static void main(String[] args) throws Exception { Main list = new Main(); list.doZip("a.txt", "a.zip"); } public void doZip(String filename, String zipfilename) throws Exception { byte[] buf = new byte[1024]; FileInputStream fis = new FileInputStream(filename); fis.read(buf, 0, buf.length); CRC32 crc = new CRC32(); ZipOutputStream s = new ZipOutputStream((OutputStream) new FileOutputStream(zipfilename)); s.setLevel(6); ZipEntry entry = new ZipEntry(filename); entry.setSize((long) buf.length); entry.setMethod(ZipEntry.DEFLATED); crc.reset(); crc.update(buf); entry.setCrc(crc.getValue()); s.putNextEntry(entry); s.write(buf, 0, buf.length); s.finish(); s.close(); } }