import javasecurityMessageDigest; import javasecurityNoSuchAlgorithmException; /**  * MD5工具类   *    * @author  * @version 0   */  public class Md5Util {     /**       * Md       *       * @param value the value       * @return the string       */      public static String md5(String value) {           try {               MessageDigest md = MessageDigestgetInstance("md5");               byte[] e = mddigest(valuegetBytes());               return toHex(e);           }           catch (NoSuchAlgorithmException e) {               eprintStackTrace();               return value;           }       }       /**       * Md       *       * @param bytes the bytes       * @return the string       */      public static String md5(byte[] bytes){         try {               MessageDigest md = MessageDigestgetInstance("md5");               byte[] e = mddigest(bytes);               return toHex(e);           }           catch (NoSuchAlgorithmException e) {               e.printStackTrace();               return "";           }       }       /**       * To hex       *       * @param bytes the bytes       * @return the string       */      private static String toHex(byte bytes[]){         StringBuilder hs = new StringBuilder();           String stmp ="";         for (int n = 0; n < byteslength; n++) {               stmp = IntegertoHexString(bytes[n] & 0xff);               if (stmplength() == 1)                   hsappend("0")append(stmp);               else                  hsappend(stmp);           }           return hstoString();       }   }