java_method_MD5加密

    /**
     * @param Original String 
     * @return Encrypted String
     */
    public String Md5(String plainText ) { 
        try { 
            MessageDigest md = MessageDigest.getInstance("MD5"); 
            md.update(plainText.getBytes()); 
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer(""); 
            for (int offset = 0; offset < b.length; offset++) { 
                i = b[offset]; 
                if(i<0) i+= 256; 
                if(i<16) 
                buf.append("0"); 
                buf.append(Integer.toHexString(i)); 
            }
            
            return buf.toString();

        } catch (NoSuchAlgorithmException e) { 
            e.printStackTrace(); 
            ExceptionHeading.getException(this.getClass().getName(), e, "Get Encrypted String Error!");
            return null;
        }
    }