import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class Main {
public static void main(String[] args) throws Exception {
String zipname = "d.zip";
CheckedInputStream checksum = new CheckedInputStream(
new FileInputStream(zipname), new Adler32());
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(checksum));
ZipEntry entry;
while ((entry = zis.getNextEntry()) != null) {
System.out.println("Unzipping: " + entry.getName());
int size;
byte[] buffer = new byte[2048];
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(entry.getName()), buffer.length);
while ((size = zis.read(buffer, 0, buffer.length)) != -1) {
bos.write(buffer, 0, size);
}
bos.flush();
bos.close();
}
zis.close();
System.out.println("Checksum = " + checksum.getChecksum().getValue());
}
}