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Compressing Streams: File Summer, Java example Java code example - Click here to copy ->>>

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/* Title: Hardcore Java
* Title: Java I/O
* Second Edition: May 2006
* ISBN 10: 0-596-52750-0
* ISBN 13: 9780596527501
*/

Code:


import java.io.*;
import java.util.zip.*;

public class FileSummer {

  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();
   
    // It would be more efficient to read chunks of data
    // at a time, but this is simpler and easier to understand.
    for (int b = in.read(); b != -1; b = in.read()) {
      cs.update(b);
    }
    return cs.getValue();
  }
}

 



References.

The list of classes which were used on this page you can find below. The links to Java API contain official SUN documentation about all used classes.

  java.util.zip.Inflater

  java.io.IOException

  java.io.FileInputStream

  java.io.InputStream

  java.util.zip.Checksum




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