queryaction.java

在STRUTS框架下实现分页处理

package struts.action;

import java.util.ArrayList;

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

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import struts.form.QueryForm;
import dao.Student;
import dipage.DiPage;


public class QueryAction extends Action
{
	
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		QueryForm queryForm = (QueryForm) form;// TODO Auto-generated method stub
		
		
	     String str=request.getParameter("PageIndex");

	     if(str==null) {
	    	 str="1";
		  }
	     int currentPage=Integer.parseInt(str);
	     System.out.println("JSP页面传过来的是：："+currentPage);
         // DiPage dp=new DiPage(); 如果用这种方式则每次都需要重新查询，所以要用下种方法
			DiPage dp=(DiPage)request.getAttribute("dp");
	        if(dp==null) {
			Student s=new Student(); 
			dp=new DiPage();
		    dp.setBigList(s.queryAll());	
		}
        dp.setCurrentPage(currentPage);
		request.setAttribute("dp",dp);
		return new ActionForward("/index.jsp");
	
	}
}