Java tutorial
//package com.java2s; import java.security.MessageDigest; public class Main { public static String MD5(String paramString) { if (paramString == null) return null; try { byte[] arrayOfByte1 = paramString.getBytes(); MessageDigest localMessageDigest = MessageDigest.getInstance("MD5"); localMessageDigest.reset(); localMessageDigest.update(arrayOfByte1); byte[] arrayOfByte2 = localMessageDigest.digest(); StringBuffer localStringBuffer = new StringBuffer(); for (int i = 0; i < arrayOfByte2.length; i++) { Object[] arrayOfObject = new Object[1]; arrayOfObject[0] = Byte.valueOf(arrayOfByte2[i]); localStringBuffer.append(String.format("%02X", arrayOfObject)); } String str = localStringBuffer.toString(); return str; } catch (Exception localException) { } return paramString.replaceAll("[^[a-z][A-Z][0-9][.][_]]", ""); } }