Write code to get MD5 Hash for a string
//package com.book2s; import java.security.MessageDigest; public class Main { public static void main(String[] argv) { String securityStr = "book2s.com"; System.out.println(MD5(securityStr)); }//from ww w .jav a 2 s . c o m public static String MD5(String securityStr) { char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; try { byte[] btInput = securityStr.getBytes(); MessageDigest mdInst = MessageDigest.getInstance("MD5"); mdInst.update(btInput); byte[] md = mdInst.digest(); 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).toLowerCase(); } catch (Exception e) { e.printStackTrace(); return null; } } }