实现分页和页码跳转 servlet代码

最新推荐文章于 2021-11-25 18:05:39 发布

xuezhengyyy

最新推荐文章于 2021-11-25 18:05:39 发布

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本文链接：https://blog.youkuaiyun.com/xuezhengyyy/article/details/9624653

这是一个Java Servlet代码示例，用于实现分页功能并处理页码跳转。通过CityDAO接口获取数据，根据请求参数计算当前页数，并在合法范围内进行页面跳转。如果页码超出范围，则重定向到404错误页面。

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package com.jheng.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.jheng.dao.impl.CityDAO;
import com.jheng.entity.City;

@WebServlet("/getAllCities.html")
public class GetAllCitiesServlet extends HttpServlet
{
   private static final long serialVersionUID = 2284565513535964381L;

   protected void doGet(javax.servlet.http.HttpServletRequest req,
           javax.servlet.http.HttpServletResponse resp)
           throws javax.servlet.ServletException, java.io.IOException
   {
       doPost(req, resp);
   }

   @Override
   protected void doPost(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException
   {
       req.setCharacterEncoding("UTF-8");
       resp.setCharacterEncoding("UTF-8");
       String pageStr = req.getParameter("page");
       CityDAO dao = new CityDAO();
       int totalPage = dao.getTotalPage();
       int page = 1;
       if (pageStr != null && pageStr.matches("^\\+?[1-9][0-9]*$"))
       {
           page = Integer.parseInt(pageStr);
       }
       if (page > 0 && page <= totalPage)
       {
           List<City> cityList = dao.findAllCities(page);
           req.setAttribute("currentPage", page);
           req.setAttribute("totalPage", totalPage);
           req.setAttribute("cList", cityList);
           req.getRequestDispatcher("WEB-INF/jsp/getAllCities.jsp").forward(req,
                   resp);
       }
       else{
           req.getRequestDispatcher("404.html").forward(req,
                   resp);
       }
   }
}