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- 首页图片内容、分页的获取与显示 ： https://mp.csdn.net/postedit/86216843
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index.jsp
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step1：先进入firststep.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>Insert title here steptwo：进入Servlet 获取 index.jsp中的内容并重定向
package cn.trade.servlet; import java.io.IOException; 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 cn.trade.model.PhotoBean; import cn.trade.serviceimp.PhotoBeanServiceImp; /** * Servlet implementation class IndexPageServlet */ @WebServlet("/IndexPageServlet") public class IndexPageServlet extends HttpServlet { /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub int currentPage = Integer.parseInt(request.getParameter("currentPage")); PhotoBean pBean = new PhotoBeanServiceImp().findByPage(currentPage); request.getSession().setAttribute("pBean", pBean); request.getRequestDispatcher("index.jsp").forward(request, response); } }stepthree：进入Service层 获取页面相关信息
package cn.trade.serviceimp; import java.util.List; import cn.trade.daoimp.AdvertDaoImp; import cn.trade.daoimp.PhotoDaoImp; import cn.trade.model.Advert; import cn.trade.model.Photo; import cn.trade.model.PhotoBean; import cn.trade.service.PhotoBeanService; public class PhotoBeanServiceImp implements PhotoBeanService { @Override public PhotoBean findAll() { // TODO Auto-generated method stub //更新全部商品信息 new PhotoDaoImp().Del(); new PhotoDaoImp().updatePhoto(); //获取轮播广告的信息 Listalist = new AdvertDaoImp().findAll(); int adsize = new AdvertDaoImp().advertSize(); List plist = new PhotoDaoImp().findAll(); int psize = new PhotoDaoImp().photoSize(); PhotoBean pb = new PhotoBean(); pb.setPlist(plist); pb.setAlist(alist); pb.setAdsize(adsize); pb.setPsize(psize); return pb; } public PhotoBean findByPage(int currentPage) { //更新全部商品信息 new PhotoDaoImp().Del(); new PhotoDaoImp().updatePhoto(); //获取轮播广告的信息 List alist = new AdvertDaoImp().findAll(); int adsize = new AdvertDaoImp().advertSize(); PhotoBean pb = new PhotoBean(); //获取分页 List pagelist = new PhotoDaoImp().findByPage(currentPage); //页面相关的信息 int totalSize = new PhotoDaoImp().photoSize(); int pageSize = PhotoDaoImp.PAGESIZE; int totalPage = totalSize%pageSize>0? totalSize/pageSize+1:totalSize/pageSize; pb.setCurrentPage(currentPage); pb.setPageSize(pageSize); pb.setTotalPage(totalPage); pb.setTotalSize(totalSize); pb.setPlist(pagelist); pb.setAlist(alist); pb.setAdsize(adsize); return pb; } } step five： 进入Dao层获取数据库信息（我是分页显示、此处将分页的代码贴出）
package cn.trade.daoimp; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import java.util.concurrent.Delayed; import cn.trade.dao.PhotoDao; import cn.trade.model.Photo; import cn.trade.util.DBUtil; public class PhotoDaoImp implements PhotoDao{ public static final int PAGESIZE = 9; @Override public ListfindAll() { // TODO Auto-generated method stub List list = new ArrayList<>(); Connection conn = DBUtil.getConn(); String sql="SELECT * FROM tb_prophoto"; try { PreparedStatement pstmt = conn.prepareStatement(sql); ResultSet rs = pstmt.executeQuery(); while(rs.next()){ Photo pho = new Photo(); pho.setPid(rs.getInt("pid")); pho.setPtitle(rs.getString("ptitle")); pho.setImgress(rs.getString("imgress")); pho.setPrice(rs.getDouble("price")); list.add(pho); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return list; } @Override public int photoSize() { // TODO Auto-generated method stub Connection conn = DBUtil.getConn(); String sql="SELECT COUNT(*) FROM tb_prophoto"; try { PreparedStatement pstmt = conn.prepareStatement(sql); ResultSet rs = pstmt.executeQuery(); while(rs.next()){ return rs.getInt(1); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return 0; } @Override public void delPhoto(int pid) { // TODO Auto-generated method stub Connection conn = DBUtil.getConn(); String sql = "DELETE FROM tb_photo WHERE pid =?"; try { PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setInt(1, pid); pstmt.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }; } public void Del(){ Connection conn = DBUtil.getConn(); String sql = "DELETE FROM tb_prophoto"; try { PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }; } @Override public void updatePhoto() { // TODO Auto-generated method stub Connection conn = DBUtil.getConn(); String sql =" INSERT INTO tb_prophoto(pid,ptitle,imgress,price)" + " SELECT pid,ptitle,imgress,outprice FROM tb_product p"; try { PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }; } @Override public List findByPage(int currentPage) { // TODO Auto-generated method stub List list = new ArrayList<>(); Connection conn = DBUtil.getConn(); String sql="SELECT * FROM tb_prophoto LIMIT ?,?"; try { PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setInt(1, (currentPage-1)*PAGESIZE); pstmt.setInt(2, PAGESIZE); ResultSet rs = pstmt.executeQuery(); while(rs.next()){ Photo pho = new Photo(); pho.setPid(rs.getInt("pid")); pho.setPtitle(rs.getString("ptitle")); pho.setImgress(rs.getString("imgress")); pho.setPrice(rs.getDouble("price")); list.add(pho); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return list; } }
实现从数据库获取信息并返回显示到首页