Java计算文件MD5值(支持大文件)
Java计算文件MD5值(支持大文件) 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"); } }
