else if(action.equals("/regist")){
            String username=request.getParameter("username");
            String name=request.getParameter("name");
            String pwd=request.getParameter("pwd1");
            String sex=request.getParameter("sex");
            String number=request.getParameter("number");
            HttpSession session=request.getSession();
            String number1=(String) session.getAttribute("number");
            //System.out.println(number+" "+number1);
            if(!number.equals(number1)){
                request.setAttribute("error", "验证码错误，请重新输入");
                request.getRequestDispatcher("regist.jsp").forward(request, response);
                return;
            }
            MessageDigest md;
            String Pwd = null;
            try {
                md = MessageDigest.getInstance("MD5");
                byte[] buf=md.digest(pwd.getBytes());
                BASE64Encoder encoder=new BASE64Encoder();
                Pwd=encoder.encode(buf);
            } catch (NoSuchAlgorithmException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            
            User u=new User();
            u.setUsername(username);
            u.setName(name);
            u.setPwd(Pwd);
            u.setSex(sex);
            EmployeeDao dao=(EmployeeDao) DAOFactory.getInstance("EmployeeDao");
            try {
                dao.regist(u);
                request.getRequestDispatcher("login.jsp").forward(request, response);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }

------解决方案--------------------
密码类型的  一般用11楼所说的那样

------解决方案--------------------
探讨


引用:

加密分為可逆不可逆，你要那種？



不好意思，这个我不懂，能解释下吗？


------解决方案--------------------
可以用DES或者TDES等等，都行，

------解决方案--------------------
简单的例子把字符与密钥在例子里是'*'做^运算，就能实现一个简单的加密解密了，当然还可以加一些换位或者加减
Java code
    public static void md5(String src) {

        char psw = '*';

        char srcArray[] = src.toCharArray();
        System.out.print("加密后：");
        for (int i = 0; i < src.length(); i++) {
            srcArray[i] = (char) (srcArray[i] ^ psw);
            System.out.print(srcArray[i]);
        }
        System.out.println("");
        System.out.print("加密前：");
        for (int i = 0; i < src.length(); i++) {
            srcArray[i] = (char) (srcArray[i] ^ psw);
            System.out.print(srcArray[i]);
            
        }
        System.out.println();
    }