supplypageaction.java

老牌java开发的物流管理系统 详细的我也没有怎么看 好像是恒基的

package com.wl.actionimpl;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.wl.action.Action;
import com.wl.dao.SupplyDAO;
import com.wl.entity.Supply;


public class SupplyPageAction implements Action {

	public String doExcute(HttpServletRequest request,
			HttpServletResponse response) {
		
		SupplyDAO supplydao = new SupplyDAO();
	
			int pageSize = 4;
			int num = 0;
			int maxNum = supplydao.getPageNum(pageSize);
			//System.out.println("_+++++++"+maxNum);
			if(request.getParameter("num") != null){
				num = Integer.parseInt(request.getParameter("num"));
				//System.out.println("_+++++++"+num);
			}
			String leaf = request.getParameter("leaf");
			
			if(leaf != null && leaf.equals("previous")){
				num = num - 1;
				if(num < 0){
					num = 0;
					request.setAttribute("prompt", "此页已经是第一页!");
				}
			}else if(leaf != null && leaf.equals("next")){
				num = num + 1;
				if(num >= maxNum){
					num = maxNum - 1;
					request.setAttribute("prompt", "此页已经是最后一页!");
				}
			}else if(leaf != null && leaf.equals("last")){
				num = maxNum - 1;
			}else if(leaf != null && leaf.equals("page")){
				num = num - 1;
			}
			request.setAttribute("pagesize", pageSize);
			request.setAttribute("num", num);
			request.setAttribute("maxnum", maxNum);
			List<Supply> list = supplydao.selectSupplyPage(pageSize, num);
			request.setAttribute("list", list);
		   return "admin/supplycentershow.jsp";
	}


}