javaweb中Servlet類實作分頁

本人采用的是三層架構寫的一個比較簡單的Servlet類實作分頁的功能。

Servlet類中的代碼：

package com.fruit.servlet;

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

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.fruit.Factory.BasicFactory;
import com.fruit.pojo.Goods;
@WebServlet(name="GoodsList",urlPatterns="/GoodsList")
public class GoodsList extends HttpServlet{
	
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		doPost(req, resp);
	}
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		ArrayList<Goods> list;
		try {
			String tj = "1=1";//總記錄條數
	   		int pageNum = 3;//每頁顯示的條數
			String emPage = req.getParameter("currpage");//擷取第幾頁	
	   		int currpage = 1;//辨別（目前頁）
			if(emPage==null){
				currpage=1;
			}else{
				currpage=Integer.parseInt(emPage);
			}
			list = BasicFactory.getGoodsPA().seletGoods(currpage, pageNum, tj);
			int n=BasicFactory.getGoodsPA().getCountPage(pageNum, tj);//總頁數
			req.setAttribute("list", list);
			req.setAttribute("n", n);
			req.setAttribute("currpage", currpage);//目前頁
			req.setAttribute("totalCount",list.size());//總記錄條數
			req.getRequestDispatcher("list.jsp").forward(req, resp);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}
}

           

jsp中的頁面代碼：

<form action="GoodsList">
  	<table >
		<tr>
   	 			<th>商品圖檔</th>
		   	 	<th>商品名稱</th>
		   	 	<th>商品類型</th>
		   	 	<th>商品數量</th>
   	 	</tr> 	
   	 	<c:forEach items="${requestScope.list }" var="goods">
   	 		<tr>
   	 			<td><img alt="" src="${goods.imgurl }" style="width:80px;height:80px"></td>
   	 			<td>${goods.goods_name }</td>
   	 			<td>${goods.goods_type }</td>
   	 			<td>${goods.pnum }</td>
   	 		</tr>
   	 	</c:forEach>
   	 	<tr>
   	 		<td colspan="4">
   	 			目前${currpage }頁/${n}頁
   	 			<a href="GoodsList?currpage=1" target="_blank" rel="external nofollow" >首頁</a>
   	 		
   	 			<a href="GoodsList?currpage=${currpage-1<=1?1:currpage-1}" target="_blank" rel="external nofollow" >上一頁</a>
   	 		
   	 			<a href="GoodsList?currpage=${currpage+1>n?n:currpage+1}" target="_blank" rel="external nofollow" >下一頁</a>
   	 		
   	 			<a href="GoodsList?currpage=${n}" target="_blank" rel="external nofollow" >尾頁</a>
   	 			跳轉到
   	 			<input type="number" min="1" max="${n}" name="currpage" style="width:50px" value="${currpage }"/>
   	 			/${n }頁
   	 			<input type="submit" value="GO">
   	 		</td>
   	 	</tr>
  	</table>
  </form>
           

效果展示：