loginservlet.java

一种java ee 中dao设计模式加mvc设计模式的用户登陆程序

package com.loginmvc.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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

import com.loginmvc.personvo.Person;
import com.loginmvc.factory.*;
public class LoginServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String path1="login.jsp";
		List errors=new ArrayList();
		//接收参数
		String id=request.getParameter("id");
		String password=request.getParameter("password");
		//将查询出的内容放入Person中
		Person person=new Person();
		person.setId(id);
		person.setPassword(password);
		person.setErrors(errors);
		//用户合法性验证
		if(person.invlidate())
		{
			//用户ID，密码合法，可以进行数据库的验证
			try {
				if(DAOFactory.getPersonDAOInstance().isLogin(person))
				{
					//用户数据合法
					request.setAttribute("person", person);
					path1="login_success.jsp";
				}
				else
				{
					//用户数据不合法
					errors.add("用户ID，密码错误！");
				}
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		request.setAttribute("errors", errors);
		request.getRequestDispatcher(path1).forward(request, response);
	}

}