vendorlistservlet.java

分为经理和出纳2个权限

package com.yiboit.cfss.vendor;

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

public class VendorListServlet extends HttpServlet {

	public static final int PAGE_LINES = 5;

	/**
	 * 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 {
		int curpage;
		int maxpage = 0;
		
		String strCurPage = request.getParameter("curpage");
		String strMaxPage = request.getParameter("maxpage");
		
		String cmd = request.getParameter("cmd");

		if (strCurPage == null) {
			curpage = 1;
		} else {
			curpage = Integer.parseInt(strCurPage);
		}

		if (strMaxPage != null) {
			maxpage = Integer.parseInt(strMaxPage);
		}
		
		HttpSession session = request.getSession();

		try {
			if (cmd == null) {
				VendorDAO dao = new VendorDAO();
				List<VendorBean> vendorList = dao.getVendorList();
				session.setAttribute("vendorList", vendorList);
				
				maxpage = vendorList.size() / PAGE_LINES;
				if (vendorList.size() % PAGE_LINES != 0) {
					maxpage ++;
				}
				
			} else if ("   next   ".equals(cmd)) {
				if (curpage < maxpage) {
					curpage++;
				}
			} else if (" previous ".equals(cmd)) {
				if (curpage > 1) {
					curpage--;
				}
			}

			int start = PAGE_LINES * (curpage - 1);
			int end = start + PAGE_LINES - 1;

			request.setAttribute("start", start);
			request.setAttribute("end", end);

			request.setAttribute("curpage", curpage);
			request.setAttribute("maxpage", maxpage);
			
			request.getRequestDispatcher("vendorList.jsp").forward(request,
					response);
		} catch (SQLException e) {
			e.printStackTrace();
			response.sendRedirect(request.getContextPath() + "/error.jsp");
		}
	}

	/**
	 * 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 {
		this.doGet(request, response);
	}
}