paginateservlet.java

servlet实现网上书店查询

package com.ghy.bookstore.book.web;

import java.io.IOException;
import java.util.ArrayList;

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 PaginateServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public PaginateServlet() {
		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 {

		response.setContentType("text/html;charset=utf-8");
		request.setCharacterEncoding("utf-8");
		String pageId = request.getParameter("pageId");
		int i = 0;
		if (pageId != null) {
			i = Integer.parseInt(pageId);
		}
		if (i < 0)
			i = 0;
		HttpSession session = request.getSession(true);
		SearchStatus search = new SearchStatus();
		search = (SearchStatus) session.getAttribute("booksearchstatus");
		ArrayList allbooklist = new ArrayList();
		allbooklist = (ArrayList) session.getAttribute("allbooklist");

		if ((search.getBookCount() != 0)
				&& (search.getBookCount() > i * SearchStatus.PAGESIZE)) {
			search.setPageId(i);
			ArrayList list = new ArrayList();
			int count;
			for (int j = 0; j < SearchStatus.PAGESIZE; j++) {
				count = search.getPageId() * SearchStatus.PAGESIZE + j;
				if (count < search.getBookCount())
					list.add(allbooklist.get(count));
			}
			session.setAttribute("booklist", list);
			session.setAttribute("booksearchstatus", search);

		}
		response.sendRedirect(request.getContextPath()
				+ "/jsp/book/bookmain.jsp");

	}

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

		doGet(request, response);
	}

	public void init() throws ServletException {
		// Put your code here
	}

}