package com.javaniu;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;

import com.google.common.io.Files;

public class FileCheckSum {

	public static final String path = "C:/factory.xls";

	public static void method1() throws Exception {
		FileInputStream fis = new FileInputStream(new File(path));
		CheckedInputStream cis = new CheckedInputStream(fis, new CRC32());
		BufferedInputStream in = new BufferedInputStream(cis);
		while (in.read() != -1) {
		}
		System.out.println("Checksum is: " + cis.getChecksum().getValue());
	}

	public static void method2() throws Exception {
		File myfile = new File(path);
		long checksum = Files.getChecksum(myfile, new CRC32());
		System.out.println("Checksum is: " + checksum);
	}

	public static void main(String[] args) throws Exception {
		method1();
		method2();
	}

}