實現MD5和SHA加密的類

接上一篇文章 寫一個MD5和SHA加密的類

import java.security.MessageDigest; /** * Encode the string according to MD5 * * @author Eskalate * @version 1.0 * @since 1.0 * */ public class MD5Utils { /** * encode the string according to MD5 * * @param s * the string want to encode * @return * the encoded String */ public final static String to_MD5(String s) { if(s==null||s.equals("")){ return ""; } char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; try { byte[] strTemp = s.getBytes(); MessageDigest mdTemp = MessageDigest.getInstance("MD5"); mdTemp.update(strTemp); byte[] md = mdTemp.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); } catch (Exception e) { return null; } } public static void main(String[] args) { System.out.println(MD5Utils.to_MD5("")); } 

使用SHA時 改算法參數爲“SHA”就可以了