pageservlet.java

在线购物系统,ajax+jsp实现

package com.accp.gz.th.zm.client.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.accp.gz.th.zm.client.javabean.*;

public class PageServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    // 处理 Get 请求
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        HttpSession session = request.getSession();

        // 取页码
        int pageno = 1;
        if (request.getParameter("currentpageno") != null &&
            !request.getParameter("currentpageno").equals("")) {
            pageno = Integer.parseInt(request.getParameter("currentpageno"));
        }

        // 取每页行数
        int linesPerPage = 10;
        if (request.getParameter("linesPerPage") != null &&
            !request.getParameter("linesPerPage").equals("")) {
            linesPerPage = Integer.parseInt(request.getParameter("linesPerPage"));
        }

        int tid = -1;
        // 取类别ID
        if (request.getParameter("tid") != null &&
            !request.getParameter("tid").equals("")) {
            tid = Integer.parseInt(request.getParameter("tid"));
        }

        // 实例化ＪＡＶＡＢＥＡＮ
        PageBean pagebean = null;
        if (session.getAttribute("pagebean") != null) {
            pagebean = (PageBean) session.getAttribute("pagebean");
        } else {
            pagebean = new PageBean();
            session.setAttribute("pagebean", pagebean);
        }

        // 从页面取数据,封装到PageBean
        pagebean.setPageNo(pageno);
        pagebean.setLinesPerPage(linesPerPage);
        pagebean.setTid(tid);

        // 通过Servlet通信回到商品页面
        RequestDispatcher dispatcher =
            request.getRequestDispatcher("GoodsList.jsp");
        dispatcher.forward(request,response);
    }

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