loginsl.java

MyEclipse下写的基于JSP/Servlet的小型用户管理系统

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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 daopkg.IUserDAO;
import daopkg.impl.UserDAOImpl;

import vopkg.UserVO;

public class loginSL extends HttpServlet {

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

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

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @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 doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}

	/**
	 * 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 {

		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		request.setCharacterEncoding("utf-8");
		String name =request.getParameter("name");
		String password = request.getParameter("password");
		UserVO  userVO = new UserVO(); 
		userVO.setName(name);
		userVO.setPassword(password);
		
		IUserDAO  userDAO = new UserDAOImpl();
		int flag = userDAO.checkLogin(userVO);
		if(flag == 1){
			HttpSession session=request.getSession();
			session.setAttribute("loginState","登陆成功！！！");
			response.sendRedirect(request.getContextPath()+"/servlet/ManagerServlet");
		}
		else if(flag == 2){
			HttpSession session=request.getSession();
			session.setAttribute("loginState","密码错误！！！");
			response.sendRedirect(request.getContextPath()+"/loginError.jsp");
		}
		else{
			HttpSession session=request.getSession();
			session.setAttribute("loginState","用户不存在！！！！");
			response.sendRedirect(request.getContextPath()+"/loginError.jsp");
		}
//		PrintWriter out = response.getWriter();
//		out.println(flag);
//		out.flush();
//		out.close();
	}

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

}