loginservlet.java

使用JSP+MSSQL开发的在线通讯录系统.包含源码

package com.e98.addressbook.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 javax.servlet.http.HttpSession;

import com.e98.addressbook.dao.BookDao;
import com.e98.addressbook.dao.UserDao;
import com.e98.addressbook.dao.impl.BookDaoImpl;
import com.e98.addressbook.dao.impl.UserDaoImpl;
import com.e98.addressbook.entity.Book;
import com.e98.addressbook.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");
		String userName = request.getParameter("userName");
		String password = request.getParameter("password");
		if (userName == null || password == null) {
			response.sendRedirect("index.jsp");
		}
		UserDao userDao = new UserDaoImpl();
		Users user = new Users();
		user = userDao.validUser(userName, password);
		if (user != null) {
			HttpSession session = request.getSession();
			session.setAttribute("user", user);
			List<Book> list = new ArrayList<Book>();
			BookDao bookDao = new BookDaoImpl();
			list = bookDao.selectAllBook(user.getUserId());
			request.setAttribute("list", list);
			request.getRequestDispatcher("bookContent.jsp").forward(request, response);

		} else {
			response.sendRedirect("index.jsp");
		}
	}

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

}