mainaction.java

serverlet+exlips的一个素据库读取例程。

//Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_4.0.1/xslt/JavaClass.xsl

package lyzn.action;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import lyzn.form.MainForm;
import lyzn.logic.Logic;
import lyzn.logic.hibernate.Emp;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.LookupDispatchAction;

/**
 * MyEclipse Struts Creation date: 03-02-2006
 * 
 * XDoclet definition:
 * 
 * @struts.action path="/main" name="mainForm" parameter="submit"
 *                scope="request"
 * @struts.action-forward name="success" path="/main.jsp"
 */
public class MainAction extends LookupDispatchAction {

	// --------------------------------------------------------- Instance
	// Variables

	// --------------------------------------------------------- Methods

	/**
	 * Method execute
	 * 
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward executeFirst(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		MainForm mainForm = (MainForm) form;
		// TODO Auto-generated method stub
		Logic logic =(Logic)servlet.getServletContext().getAttribute("logic");
		List list = logic.getPageData(1);
		request.setAttribute("data", list);
		mainForm.setPage(1);
		// request.removeAttribute("mainForm");
		return mapping.findForward("success");
	}

	public ActionForward executePrevios(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		MainForm mainForm = (MainForm) form;
		int page = mainForm.getPage();
		page -= 1;
		if (page <= 0) {
			page = 1;
		}
		Logic logic =(Logic)servlet.getServletContext().getAttribute("logic");
		List list = logic.getPageData(page);
		request.setAttribute("data", list);
		mainForm.setPage(page);

		return mapping.findForward("success");

	}

	public ActionForward executeNext(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		MainForm mainForm = (MainForm) form;
		int page = mainForm.getPage();
		page += 1;
		Logic logic =(Logic)servlet.getServletContext().getAttribute("logic");
		List list = logic.getPageData(page);
//		System.out.println(list);
		while(list==null && page>=1){
			page--;
			list=logic.getPageData(page);
		}
		if(list==null){
			list=new ArrayList();
		}
		request.setAttribute("data", list);
		mainForm.setPage(page);
		return mapping.findForward("success");
	}

	public ActionForward executeLast(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		MainForm mainForm = (MainForm) form;
		// TODO Auto-generated method stub
		int page=0;
		Logic logic =(Logic)servlet.getServletContext().getAttribute("logic");
		List list=null;
		do{
			list=logic.getPageData(++page);
		}while(list!=null);
		page--;
		list=logic.getPageData(page);
		request.setAttribute("data",list);
		mainForm.setPage(page);
		return mapping.findForward("success");
	}

	protected Map getKeyMethodMap() {
		// TODO Auto-generated method stub
		Map map = new HashMap();
		map.put("button.first", "executeFirst");
		map.put("button.previos", "executePrevios");
		map.put("button.next", "executeNext");
		map.put("button.last", "executeLast");
		return map;
	}

}