loginservlet.java

主要是用net开发的 用mvc模式 有酒店管理

package com.apache.servlet;

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

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

import com.apache.dao.CheckLogin;
import com.apache.dao.TitlesBean;
import com.apache.pojo.BookBean;
import com.apache.pojo.User;

public class LoginServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public LoginServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=gbk");
		PrintWriter out = response.getWriter();
		HttpSession session=request.getSession();
		//提取参数
		String name=request.getParameter("userName");
		String pwd=request.getParameter("pwd");
		
		User user=new User(name,pwd);
		//验证该用户是否存在，如果存在就转向books.jsp页面，否则返回登陆页面
		CheckLogin check=new CheckLogin();
		if(check.validate(user))
		{
			TitlesBean tb=new TitlesBean();
			List<BookBean> list=(List<BookBean>)tb.getTitles();
			session.setAttribute("list",list);
			response.sendRedirect("books.jsp");
			session.setAttribute("check",tb);
			session.setAttribute("user", user);
		}else
		{
			session.setAttribute("loginError","用户名或密码错误!");
			response.sendRedirect("login.jsp");
			
		}
		
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request,response);
}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}