adminuserservlet.java

用java编写的程序

package webbook.guestbook;
import webbook.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import webbook.guestbook.dao.AdminDAO;
import webbook.guestbook.dao.jdbc.AdminDAOJdbc;

public class AdminUserServlet extends HttpServlet {
	private static final long serialVersionUID = 5801558969966197290L;

	public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String message = "";
		String username = request.getParameter("username");
		String password = request.getParameter("password");

		if (StringUtil.validateNull(username)) {
			message = "对不起，姓名不能为空，请您重新输入！<br>";
		} else if (StringUtil.validateNull(password)) {
			message = "对不起，密码不能为空，请您重新输入！<br>";
		} else {
			Admin tempUser = new Admin();
			tempUser.setUsername(username);
			tempUser.setPassword(password);
			AdminDAO dao= new AdminDAOJdbc();
			if (dao.getAdmin(username, password) == null) {
				message = "对不起，用户名或者密码错误";
				request.setAttribute("guesbook.admin.login.message", message);
				request.getRequestDispatcher("/admin/loginFail.jsp").forward(request, response);
			} else {
				HttpSession session = request.getSession();
				session.setAttribute("guesbook.admin.username", username);
				response.sendRedirect(request.getContextPath()+"/admin/secure/manage?q=list");
			}
		}
	}

	public void logout(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession();
		session.removeAttribute("guesbook.admin.username");
		response.sendRedirect(request.getContextPath()+"/admin/login.jsp");		
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String method = request.getParameter("q");
		if (method != null && method.equals("login")) {
			login(request, response);
		} else {
			logout(request, response);
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}