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 Tools and Libs > Commons IO > Basic > File Checksum

File Checksum 

Apache Commons IO is a java library with simple IO utilities and filters. This requires the library commons-io-2.1.jar to be in classpath. The following example shows using FileUtils.checksumCRC32() API. It returns the checksum of given file using CRC32 checksum algorithm.

File Name  :  
com/bethecoder/tutorials/commons_io/tests/FileChecksum.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.commons_io.tests;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;

public class FileChecksum {

  /**
   @param args
   @throws IOException 
   */
  public static void main(String[] argsthrows IOException {
    File file = new File("C:/Test/rule_engine_names2.txt");
    
    //Get checksum using CRC32 checksum routine
    long checkSum = FileUtils.checksumCRC32(file);
    System.out.println("File checksum : " + checkSum);
  }
}
   

It gives the following output,
File checksum : 1495706579


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