MD5Utils工具类

Posted 2021-02-09 thcy1314

/** 
 * 使用MD5加密
 */
package com.CCTV.users.infrastructure.utils;

import java.security.MessageDigest;
import java.util.UUID;

/**
 * @author scy
 */
public class MD5Utils {
　　//小写十六位进制数字（里边的可以修改）
   private static final char hexDigits[] = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘ };
   //大写十六进制数字（里边的可以修改）
   private static final char upperCaseHexDigits[] = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘ };
   
   public static String md5(String s) {
      return md5(s, hexDigits);
   }
   public static String md5UpperCase(String s) {
      return md5(s, upperCaseHexDigits);
   }
   public static String md5(String s,char hexDigits[]) {
      try {
         byte[] btInput = s.getBytes();
         MessageDigest mdInst = MessageDigest.getInstance("MD5");
         mdInst.update(btInput);
         byte[] md = mdInst.digest();
         int j = md.length;
         char str[] = new char[j * 2];
         int k = 0;
         for (int i = 0; i < j; i++) {
            byte byte0 = md[i];
            str[k++] = hexDigits[byte0 >>> 4 & 0xf];
            str[k++] = hexDigits[byte0 & 0xf];
         }
         return new String(str);
      } catch (Exception e) {
         e.printStackTrace();
         return null;
      }
   }
   public static void main(String[] args) {
      System.out.println(UUID.randomUUID());
   }
}