import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.math.BigInteger;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class Test {

    public static void main(String[] args) {

        try {

            File file = new File("F://test.txt");

            FileInputStream fis = new FileInputStream(file);

            MessageDigest md = MessageDigest.getInstance("MD5");

            byte[] buffer = new byte[1024];

            int length = -1;

            while ((length = fis.read(buffer, 0, 1024)) != -1) {

                md.update(buffer, 0, length);

            }

            BigInteger bigInt = new BigInteger(1, md.digest());

            System.out.println("文件md5值：" + bigInt.toString(16));

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}