Java计算文件MD5值(支持大文件)

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package com.hthl.xxtd;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.security.MessageDigest;import org.apache.commons.codec.binary.Hex;import org.apache.commons.codec.digest.DigestUtils;/** *MD5计算工具 xuxile 2017-09-13 */public class Md5CaculateUtil {/** * 获取一个文件的md5值(可处理大文件) * @return md5 value */public static String getMD5(File file) {FileInputStream fileInputStream = null;try {MessageDigest MD5 = MessageDigest.getInstance("MD5");fileInputStream = new FileInputStream(file);byte[] buffer = new byte[8192];int length;while ((length = fileInputStream.read(buffer)) != -1) {MD5.update(buffer, 0, length);}return new String(Hex.encodeHex(MD5.digest()));} catch (Exception e) {e.printStackTrace();return null;} finally {try {if (fileInputStream != null){fileInputStream.close();}} catch (IOException e) {e.printStackTrace();}}}/** * 求一个字符串的md5值 * @param target 字符串 * @return md5 value */public static String MD5(String target) {return DigestUtils.md5Hex(target);}public static void main(String[] args) {long beginTime = System.currentTimeMillis();File file = new File("D:/1/pdi-ce-7.0.0.0-24.zip");String md5 = getMD5(file);long endTime = System.currentTimeMillis();System.out.println("MD5:" + md5 + "\n 耗时:" + ((endTime - beginTime) / 1000) + "s");}}

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