bookaction.java

基于Struts的分页功能

package com.struts.action;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import com.struts.form.BookForm;
import com.zhku.dao.BookDao;
import com.zhku.factory.DAOfactory;


public class BookAction extends DispatchAction {
	
	public ActionForward selectall(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		BookForm bookForm = (BookForm) form;
		
		int lineSize=8;//每页显示8行；
		int currentPage=1;//当前第几页；
		int allRecorders=0;//显示全部记录数；
        BookDao  bdao=DAOfactory.getBookDAOInstance();
		List all=null;//全部记录数
	try {
		currentPage = Integer.parseInt(request.getParameter("cp"));
	} catch (Exception e) {
		e.getStackTrace();
	}  
	try {
		allRecorders = bdao.getAllCount();//求出全部记录数；
		all=bdao.queryAll(currentPage, lineSize);
	} catch (Exception e) {
		e.getStackTrace();
	}	
      /**	  将数据保存到页面中**/
	
	    request.setAttribute("currentPage",new Integer(currentPage));
	    request.setAttribute("lineSize", new Integer(lineSize));
	    request.setAttribute("allRecorders",new Integer(allRecorders));
	    request.setAttribute("all", all);

		return mapping.findForward("list");
	}
	
	
	public ActionForward selectlike(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		BookForm bookForm = (BookForm) form;//
		String keyWord=null;//接受查询关键件字
		int lineSize=8;//每页显示8行记录；
		int currentPage=1;//当前第几页
		int allRecorders=0;//全部记录数
		BookDao bdao=DAOfactory.getBookDAOInstance();
		List all=null;//全部记录
		keyWord=request.getParameter("kw");//从页面取出kw对象并放入keyWord中
		
		try {
			currentPage = Integer.parseInt(request.getParameter("cp"));//接收cp保存在curentPage
		} catch (Exception e) {
			e.printStackTrace();
		}
			try {
				allRecorders = bdao.getLikeCount(keyWord);//求出全部数
				all = bdao.queryLikeAll(keyWord, currentPage, lineSize);
			} catch (Exception e) {
				e.printStackTrace();// TODO: handle exception
			}
			request.setAttribute("currentPage", new Integer(currentPage));
			request.setAttribute("lineSize", new Integer(lineSize));
			request.setAttribute("allRecorders",new Integer( allRecorders));
			request.setAttribute("keyWord", keyWord);
			request.setAttribute("all", all);
			/*   把数据保存到页面中
			 * */
		return mapping.findForward("list");
	}
}