loginservlet.java

MVC设计+jsp+servlet+sqlserver开发

package com.accp.fan.servlet;

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

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

import com.accp.fan.dao.Usersdao;
import com.accp.fan.entity.Users;

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
	}

	/**
	 * 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 {

		request.setCharacterEncoding("GBK");
		response.setContentType("text/html;charSet=GBK");

		// 从simLogin.html中获取提交的用户名和密码
		String loginName = request.getParameter("loginName");
		String loginPass = request.getParameter("loginPass");
		Usersdao dao = new Usersdao();
		try {
			Users user = dao.getUserInfoByName(loginName);
			
			if ( null==user) {
				// 用户名错误
				response.sendRedirect(request.getContextPath()
						+ "/loginError.jsp");
			}
			// 登录验证，当用户名和密码全为accp时，提示登录成功，否则提示登录失败
			else if (user.getUserName().equals(loginName)
					&& user.getUserPWD().equals(loginPass)) {

				response.sendRedirect("showServlet.do");

			} else {
				response.sendRedirect(request.getContextPath()
						+ "/loginError.jsp");
			}

		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

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

}