loginaction.java

仿google 分页的非常好的方法啊

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package strut.action;

import java.util.List;

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

import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
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.bo.UserBO;

import strut.form.LoginForm;

/** 
 * MyEclipse Struts
 * Creation date: 04-05-2008
 * 
 * XDoclet definition:
 * @struts.action path="/login" name="loginForm" parameter="action" scope="request" validate="true"
 */
public class LoginAction extends DispatchAction {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward page(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		LoginForm loginForm = (LoginForm) form;// TODO Auto-generated method stub
		List lt=null;
		int page=0;//初始页面数
		int count=0;//初始记录数
		int now_page=1;//初始当前页
		int temp_now_page=0;//临时变量保存当前页
		UserBO bo=new UserBO();
		ActionErrors errors=new ActionErrors();
		String go=request.getParameter("go");//获取要跳转的页面
		String next=request.getParameter("next");//下一次要显示的页面
		count=bo.count();//获取记录
		if(count==0){//无记录时候
        errors.add("no",new ActionError("page.isnull"));
        saveErrors(request,errors);
//    	return mapping.getInputForward();
		}
		if(count%2==0){
			page=count/2;
		}else{
			page=count/2+1;
		}
		if(go!=null){//判断是否用户要跳转
			try {
				now_page = Integer.parseInt(go);//当接受的不是数字时候
			} catch (Exception e) {
				// TODO: handle exception
				errors.add("no",new ActionError("errors.numformat"));
				saveErrors(request,errors);
				return mapping.findForward("page");
			}			
		}else
			if(next!=null){
				
			try {
				now_page = Integer.parseInt(next);//当接受不是数字时候
			} catch (Exception e) {
				// TODO: handle exception
				errors.add("no",new ActionError("errors.numformat"));
				saveErrors(request,errors);
				return mapping.findForward("page");
			}			
		}else{
			now_page=1;
		}
		if(now_page>page){//当用户输入过大时候
			errors.add("no",new ActionError("errors.toolong",page,page));
		saveErrors(request,errors);
		return mapping.getInputForward();
			
		}
	    temp_now_page=now_page-1;
		lt=bo.page(temp_now_page);
		String page_cut=bo.page_cut(page, now_page);
	
		request.setAttribute("page_cut",page_cut);
		
		request.setAttribute("lt",lt);

		return mapping.findForward("page");
	}
}