Java Tutorial/Development/CRC32

CRC32 check

   <source lang="java">

import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.util.zip.CRC32; import java.util.zip.Checksum; public class MainClass {

 public static void main(String[] args) throws IOException {
   FileInputStream fin = new FileInputStream(args[0]);
   System.out.println(args[0] + ":\t" + getCRC32(fin));
   fin.close();
 }
 public static long getCRC32(InputStream in) throws IOException {
   Checksum cs = new CRC32();
   // more efficient to read chunks of data at a time
   for (int b = in.read(); b != -1; b = in.read()) {
     cs.update(b);
   }
   return cs.getValue();
 }

}</source>