1     public static String encryptByMD5(String str) { 2         MessageDigest messageDigest = null; 3  4         try { 5             messageDigest = MessageDigest.getInstance("MD5"); 6             messageDigest.reset(); 7             messageDigest.update(str.getBytes("UTF-8")); 8         } catch (NoSuchAlgorithmException e) { 9             e.printStackTrace();10         } catch (UnsupportedEncodingException e) {11             e.printStackTrace();12         }13 14         byte[] byteArray = messageDigest.digest();15         StringBuffer md5StrBuff = new StringBuffer();16 17         for (int i = 0; i < byteArray.length; i++) {18             if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {19                 md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));20             } else {21                 md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));22             }23         }24 25         return md5StrBuff.toString();26     }