manageservlet.java

用java编写的程序

package webbook.guestbook;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import org.displaytag.tags.TableTagParameters;
import org.displaytag.util.ParamEncoder;
import webbook.guestbook.dao.GuestbookDAO;
import webbook.guestbook.dao.jdbc.GuestbookDAOJdbc;
import webbook.util.Pagination;

public class ManageServlet extends HttpServlet {
	private static final long serialVersionUID = 204655027689309554L;
	private int pageSize = 1;

	public void edit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		GuestbookDAO dao = new GuestbookDAOJdbc();
		Guestbook gb = dao.getGuestbook(new Integer(request.getParameter("id")));
		request.setAttribute("guestbook.admin.edit", gb);
		request.getRequestDispatcher("/admin/secure/edit.jsp").forward(request, response);
	}

	public void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		GuestbookDAO dao = new GuestbookDAOJdbc();
		Guestbook gb = new Guestbook();
		gb.setId(new Integer(request.getParameter("id")));
		gb.setName(request.getParameter("name"));
		gb.setEmail(request.getParameter("email"));
		gb.setPhone(request.getParameter("phone"));
		gb.setTitle(request.getParameter("title"));
		gb.setContent(request.getParameter("content"));
		boolean result = dao.update(gb);
		if (result) {
			request.setAttribute("guestbook.admin.update.message", "更新成功！");
			request.setAttribute("guestbook.admin.edit", gb);
		} else {
			request.setAttribute("guestbook.admin.update.message", "更新失败！");
		}
		request.getRequestDispatcher("/admin/secure/updateResult.jsp").forward(request, response);
	}

	public void delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		GuestbookDAO dao = new GuestbookDAOJdbc();
		boolean result = dao.remove(new Integer(request.getParameter("id")));
		if (result) {
			request.setAttribute("guestbook.admin.delete.message", "删除成功");
		} else {
			request.setAttribute("guestbook.admin.delete.message", "删除失败");
		}
		request.getRequestDispatcher("/admin/secure/deleteResult.jsp").forward(request, response);
	}

	public void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		int pageNumber;
		String paramName=(new ParamEncoder("gb").encodeParameterName(TableTagParameters.PARAMETER_PAGE));
		try{
			pageNumber=Integer.parseInt(request.getParameter(paramName));		
		}catch(Exception e){
			 pageNumber=1; 
		}
		GuestbookDAO dao = new GuestbookDAOJdbc();
		Pagination pager=dao.getGuestbooksByPage(pageSize, pageNumber);
		request.setAttribute("guestbook.admin.list", pager.getList());
		request.setAttribute("guestbook.admin.total", pager.getMaxElements());
		request.getRequestDispatcher("/admin/secure/list.jsp").forward(request, response);
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String method = request.getParameter("q");
		if (method == null) {
			method = "list";
		}
		if (method.equals("edit")) {
			edit(request, response);
		} else if (method.equals("delete")) {
			delete(request, response);
		} else if (method.equals("update")) {
			update(request, response);
		} else {
			list(request, response);
		}
	}

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

	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		try {
			pageSize = Integer.parseInt(config.getServletContext().getInitParameter("pageSize"));
		} catch (Exception e) {
			pageSize = 1;
		}
	}
}