JAVA MD5加密

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package com.demo;   import java.security.MessageDigest;   public class MD5Util {       private static final String ALGORITHM = "MD5";       private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5',             '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };       /**      * encode string      *      * @param algorithm      * @param str      * @return String      */     public static String encode(String algorithm, String str) {         if (str == null) {             return null;         }         try {             MessageDigest messageDigest = MessageDigest.getInstance(algorithm);             messageDigest.update(str.getBytes());             return getFormattedText(messageDigest.digest());         } catch (Exception e) {             throw new RuntimeException(e);         }       }       /**      * encode By MD5      *      * @param str      * @return String      */     public static String getStringMD5String(String str) {         if (str == null) {             return null;         }         try {             MessageDigest messageDigest = MessageDigest.getInstance(ALGORITHM);             messageDigest.update(str.getBytes());             return getFormattedText(messageDigest.digest());         } catch (Exception e) {             throw new RuntimeException(e);         }       }       /**      * Takes the raw bytes from the digest and formats them correct.      *      * @param bytes      *            the raw bytes from the digest.      * @return the formatted bytes.      */     private static String getFormattedText(byte[] bytes) {         int len = bytes.length;         StringBuilder buf = new StringBuilder(len * 2);         // 把密文转换成十六进制的字符串形式         for (int j = 0; j < len; j++) {                      buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);             buf.append(HEX_DIGITS[bytes[j] & 0x0f]);         }         return buf.toString();     }       public static void main(String[] args) {         System.out.println(MD5Util.getStringMD5String("123")); //      System.out.println("111111 MD5  :" //              + EncoderHandler.encode("MD5", "111111")); //      System.out.println("111111 SHA1 :" //              + EncoderHandler.encode("SHA1", "111111"));     }   }