content: package cn.datax.common.database.utils;
  
  import java.security.MessageDigest;
  import java.util.Arrays;
  
  public class MD5Util {
  
      public static void main(String[] args) throws InterruptedException {
          Object[] arr = new Object[]{"dbName"};
          Object[] objects = Arrays.copyOf(arr, arr.length + 2);
          System.out.println(objects.length);
          int length = arr.length;
          objects[length] = 1;
          objects[length+1] = 2;
          System.out.println(Arrays.toString(objects));
  //        String encrypt = MD5Util.encrypt("sql" + ":" + Arrays.toString(arr));
  //        System.out.println(encrypt);
      }
  
      private static final char[] HEX_CHARS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
  
      /**
       * MD5加密
       */
      public static String encrypt(String value){
          return encrypt(value.getBytes());
      }
  
      /**
       * MD5加密
       */
      public static String encrypt(byte[] value){
          try {
              byte[] bytes = MessageDigest.getInstance("MD5").digest(value);
              char[] chars = new char[32];
              for (int i = 0; i < chars.length; i = i + 2) {
                  byte b = bytes[i / 2];
                  chars[i] = HEX_CHARS[(b >>> 0x4) & 0xf];
                  chars[i + 1] = HEX_CHARS[b & 0xf];
              }
              return new String(chars);
          } catch (Exception e) {
              throw new RuntimeException("md5 encrypt error", e);
          }
      }
  }
  