show.java

企业进销存管理系统

package action;

import java.util.ArrayList;
import java.util.HashMap;

import javax.servlet.http.HttpSession;

public class Show {
	public static ArrayList page(ArrayList al,int n,HttpSession s){
		ArrayList a=new ArrayList();
		int sumPage=al.size()/5+1;
		if(al.size()%5==0){
			sumPage--;
		}else{}
		
		if(n<=0){
			n=1;
		}else if(n>sumPage){
			n=sumPage;
		}
		
		try{
			for(int i=0;i<5;i++){
				HashMap has=(HashMap)al.get(5*(n-1)+i);
				if(has!=null){
					a.add(has);
				}else{
					break;
				}
			}
		}
		catch(IndexOutOfBoundsException e){
			System.out.println("something wrong");
		}
		
		s.setAttribute("sumpage", sumPage);
		System.out.println("sumpage="+sumPage);
		s.setAttribute("sumrecord", al.size());
		System.out.println("sumrecord"+al.size());
		s.setAttribute("nowpage", n);
		System.out.println("nowpage"+n);
		return a;
	}
}