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”);



 }



}

转自：https://blog.csdn.net/xuxile/article/details/77963894