viewaction.java

应用struts技术开发的java的多表关系的增删改应用程序

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

package com.xaccp.struts.action;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
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 com.xaccp.service.EmpService;

/** 
 * MyEclipse Struts
 * Creation date: 01-09-2007
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 */
public class ViewAction extends Action {
	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	
	//每页10条记录
	private static final int PAGE_SIZE=10;
	
	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response) {

		EmpService emp=new EmpService();
		/**
		 * 获得所有员工信息
		 */
		List list=emp.getAllEmp();
		if(list==null){
			//登陆失败
			ActionErrors ae=new ActionErrors();
			ae.add("error",new ActionError("error","Employee"));
			super.saveErrors(request,ae);
			//跳转到错误页面
			return mapping.getInputForward();
		}
		//将员工信息保存在request中
		request.setAttribute("EmpList",list);
		//分页处理
		int pageCount = (list.size()-1)/PAGE_SIZE+1;  //总页数
		int page = 1;  //当前页数
		
		try {
			page = Integer.parseInt(request.getParameter("page"));  //从请求流中获得当前页数
		} catch (NumberFormatException e) {
		}
		if(page < 1)page = 1;
        if(page > pageCount)page = pageCount;
	
        //保存分页的数据request
        request.setAttribute("page",page+"");
        request.setAttribute("pageCount",pageCount+"");
        request.setAttribute("pagesize",PAGE_SIZE+"");
        request.setAttribute("offset",((page-1)*PAGE_SIZE)+"");  //offset为本页第一条记录在集合中的位置
		
		return mapping.findForward("ok");
	}

}