md5加密工具类
package cn.rx.oamp.util;import java.security.MessageDigest;import java.util.Date;/** * 采用MD5生成32位字符串 * @author zhongyao * @version 2010年12月27日18:02:06 * */public class RxMD5 {private static final RxMD5 rxmd5 = new RxMD5();private static int seed = 1;private RxMD5(){}public static RxMD5 getInstance(){return rxmd5;}/** * 对字符串采用MD5加密 * @param s * @return */public final String md5(String s) {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;}}}?