java 32位MD5加密的大写字符串

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package com.aok.test;   import java.security.MessageDigest;   public class MD5Test {     public static void main(String[] args) {         String result = MD5("123456");         System.out.println("result: " + result);         System.out.println("length: " + result.length());     }       /**      * 32位MD5加密的大写字符串      *      * @param s      * @return      */     public final static String MD5(String s) {         char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',                 'A', 'B', 'C', 'D', 'E', 'F' };         try {             byte[] btInput = s.getBytes();             // 获得MD5摘要算法的 MessageDigest 对象             MessageDigest mdInst = MessageDigest.getInstance("MD5");             // 使用指定的字节更新摘要             mdInst.update(btInput);             // 获得密文             byte[] md = mdInst.digest();             // 把密文转换成十六进制的字符串形式             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;         }     } }