Tool.java

package com.coderising.helper;

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 Tool
{
	public static String getMd5(String fileName) {
		try {
			File file = new File(fileName);
			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));
			return bigInt.toString(16);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static String getSHA256(String fileName) {
		try {
			File file = new File(fileName);
			FileInputStream fis = new FileInputStream(file);
			MessageDigest md = MessageDigest.getInstance("SHA-256");
			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SHA256值：" + bigInt.toString(16));
			return bigInt.toString(16);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

}