content: package org.ruoyi.common.utils;
  
  import cn.hutool.core.util.StrUtil;
  
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  import java.util.Map;
  import java.util.TreeMap;
  
  /**
   * MD5 算法
   *
   * @author Admin
   */
  public class MD5Util {
  
      /**
       * 全局数组
       */
      public final static String[] strDigits = { "0", "1", "2", "3", "4", "5",
              "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
  
      public MD5Util() {
      }
  
      /**
       * 返回形式为数字跟字符串
       *
       * @Date 2023/7/3
       * @param bByte
       * @return String
       **/
      public static String byteToArrayString(byte bByte) {
          int iRet = bByte;
          if (iRet < 0) {
              iRet += 256;
          }
          int iD1 = iRet / 16;
          int iD2 = iRet % 16;
          return strDigits[iD1] + strDigits[iD2];
      }
  
      /**
       * 转换字节数组为16进制字串
       *
       * @Date 2023/7/3
       * @param bByte
       * @return String
       **/
      public static String byteToString(byte[] bByte) {
          StringBuffer sBuffer = new StringBuffer();
          for (int i = 0; i < bByte.length; i++) {
              sBuffer.append(byteToArrayString(bByte[i]));
          }
          return sBuffer.toString();
      }
  
      /**
       * 生成md5代码
       *
       * @Date 2023/7/3
       * @param strObj
       * @return String
       **/
      public static String GetMD5Code(String strObj) {
          String resultString = null;
          try {
              resultString = new String(strObj);
              MessageDigest md = MessageDigest.getInstance("MD5");
              resultString = byteToString(md.digest(strObj.getBytes()));
          } catch (NoSuchAlgorithmException ex) {
              ex.printStackTrace();
          }
          return resultString;
      }
  
      /**
       * 组装签名的字段
       *
       * @param params     参数
       * @param urlEncoder 是否urlEncoder
       * @return {String}
       */
      public static String packageSign(Map<String, Object> params, boolean urlEncoder) {
          // 先将参数以其参数名的字典序升序进行排序
          TreeMap<String, Object> sortedParams = new TreeMap<String, Object>(params);
          // 遍历排序后的字典，将所有参数按"key=value"格式拼接在一起
          StringBuilder sb = new StringBuilder();
          boolean first = true;
          for (Map.Entry<String, Object> param : sortedParams.entrySet()) {
              String value = String.valueOf(param.getValue());
              if (StrUtil.isBlank(value)) {
                  continue;
              }
              if (first) {
                  first = false;
              } else {
                  sb.append("&");
              }
              sb.append(param.getKey()).append("=");
              sb.append(value);
          }
          return sb.toString();
      }
  
  }
  