content: package com.cf.framework.utils;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  
  /**
   * Created by admin on 2020/3/5.
   */
  public class MD5Util {
  
      /**
       * The M d5.
       */
      static MessageDigest MD5 = null;
  
      /**
       * The Constant HEX_DIGITS.
       */
      private static final char HEX_DIGITS[] = {'0', '1', '2', '3', '4', '5',
              '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
  
      static {
          try {
              MD5 = MessageDigest.getInstance("MD5");
          } catch (NoSuchAlgorithmException ne) {
              ne.printStackTrace();
          }
      }
  
      /**
       * 获取文件md5值.
       *
       * @param file the file
       * @return md5串
       * @throws IOException
       */
      public static String getFileMD5String(File file) throws IOException {
          FileInputStream fileInputStream = null;
          try {
              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(encodeHex(MD5.digest()));
          } catch (FileNotFoundException e) {
              throw e;
          } catch (IOException e) {
              throw e;
          } finally {
              try {
                  if (fileInputStream != null)
                      fileInputStream.close();
              } catch (IOException e) {
                  throw e;
              }
          }
      }
  
      /**
       * 获取文件md5值.
       *
       * @param data the byte[] data
       * @return md5串
       * @throws IOException
       */
      public static String getFileMD5String(byte[] data) throws IOException {
          MD5.update(data);
          return new String(encodeHex(MD5.digest()));
      }
  
      /**
       * Encode hex.
       *
       * @param bytes the bytes
       * @return the string
       */
      public static String encodeHex(byte bytes[]) {
          return bytesToHex(bytes, 0, bytes.length);
  
      }
  
      /**
       * Bytes to hex.
       *
       * @param bytes the bytes
       * @param start the start
       * @param end   the end
       * @return the string
       */
      public static String bytesToHex(byte bytes[], int start, int end) {
          StringBuilder sb = new StringBuilder();
          for (int i = start; i < start + end; i++) {
              sb.append(byteToHex(bytes[i]));
          }
          return sb.toString();
  
      }
  
      /**
       * Byte to hex.
       *
       * @param bt the bt
       * @return the string
       */
      public static String byteToHex(byte bt) {
          return HEX_DIGITS[(bt & 0xf0) >> 4] + "" + HEX_DIGITS[bt & 0xf];
  
      }
  
      /**
       * 获取md5值.
       *
       * @param str the string
       * @return md5串
       * @throws IOException
       */
      public static String getStringMD5(String str) {
          StringBuilder sb = new StringBuilder();
          try {
              byte[] data = str.getBytes("utf-8");
              MessageDigest MD5 = MessageDigest.getInstance("MD5");
              MD5.update(data);
              data = MD5.digest();
              for (int i = 0; i < data.length; i++) {
                  sb.append(HEX_DIGITS[(data[i] & 0xf0) >> 4] + "" + HEX_DIGITS[data[i] & 0xf]);
              }
          } catch (Exception e) {
          }
          return sb.toString();
      }
  
      /**
       * The main method.
       *
       * @param args the arguments
       */
      public static void main(String[] args) {
  
          long beginTime = System.currentTimeMillis();
          File fileZIP = new File("D:\\BaiduNetdiskDownload\\test1.avi");
  
          String md5 = "";
          try {
              md5 = getFileMD5String(fileZIP);
          } catch (IOException e) {
              e.printStackTrace();
          }
          long endTime = System.currentTimeMillis();
          System.out.println("MD5:" + md5 + "\n time:" + ((endTime - beginTime)) + "ms");
  
          System.out.println(getStringMD5("111111"));
      }
  }
  