checklogin.java

又一个课程设计 简易 JSP 论坛 功能较简单的那种, 界面上模仿了 Discuz JSP 本来就学的不行, 只是尽量实现了 MVC

package cn.ialvin.bbs.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import cn.ialvin.bbs.bean.User;
import cn.ialvin.bbs.common.Tools;
import cn.ialvin.bbs.dao.DAOFactory;
import cn.ialvin.bbs.dao.IUserDAO;
import cn.ialvin.web.Servlet;

public class CheckLogin extends Servlet {
	private static final long serialVersionUID = 1L;
	public CheckLogin() { super(); }
	public void destroy() { super.destroy(); }

	public void doAction(
			HttpServletRequest request,
			HttpServletResponse response,
			PrintWriter out,
			DAOFactory factory)
			throws ServletException, IOException, SQLException {
		HttpSession session = request.getSession();
		if (!this.getParameter("vcode", request).equals(session.getAttribute("VCode"))) {
			this.alert("验证码不正确！", out);
			this.replace("../login.jsp", out);
			return;
		}
		String usn = this.getParameter("usn", request);
		String pwd = this.getParameter("pwd", request);
		if (!usn.matches("(?i)^[a-z\\d]{4,12}$")
				|| !pwd.matches("(?i)^[a-z\\d]{4,12}$")) {
			this.alert("非法进入", out);
			this.replace("../Index", out);
			return;
		}
		IUserDAO ud = factory.getUserDAO();
		User usr = ud.getUser(usn);
		if (usr == null) {
			this.alert("用户名不正确！", out);
			this.replace("../login.jsp", out);
		} else if (usr.getPwd()==null || !usr.getPwd().equals(Tools.encodeMD5(pwd))) {
			this.alert("密码不正确！", out);
			this.replace("../login.jsp", out);
		} else {
			session.setAttribute("isLogin", "YES");
			session.setAttribute("usr", usr);
			this.replace("../Index", out);
		}
	}
}