preborrowaction.java

来自「一个基本的图书馆管理系统」· Java 代码 · 共 75 行

package c18.struts.action;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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 c18.service.BorrowService;
import c18.service.BorrowServiceImpl;
import c18.session.UserSession;
import c18.struts.action.exception.ActionException;
import c18.struts.action.exception.ExistReferActionException;
import c18.struts.action.exception.NotEnoughActionException;
import c18.util.ConvertUtil;

/** 
 * 
 * 预借图书Action类
 * @struts.action path="/preborrow"scope="request"
 * @struts.action-forward name="success" path="/optresult.jsp"
 */
public class PreBorrowAction extends Action {
	private static final Log log = LogFactory.getLog(PreBorrowAction.class);

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		//判断是否登陆
		if(!UserSession.isLogin(request, response)){
			return mapping.findForward("/main");
		}
		
		
		//得到图书号
		int bookNo =0;
		String sbookNo = request.getParameter("bookNo");
		if(sbookNo != null && !sbookNo.equals("")){
			bookNo = ConvertUtil.convertInt(sbookNo);
		}
		try {
			//预借图书
			BorrowService borrowservice = new BorrowServiceImpl();
			borrowservice.preBorrow(UserSession.getSession(request, response).getUserNo(), bookNo);
		} catch (ActionException e) {
			//余量不足
			if(e instanceof NotEnoughActionException){
				request.setAttribute("errorString", e.getExceptionString());
				return mapping.findForward("success");
			}else
			//已有未处理预借或已借阅
			if(e instanceof ExistReferActionException){
				request.setAttribute("errorString", e.getExceptionString());
				return mapping.findForward("success");
			}
			
			log.error(e);
		}
			
		
		return mapping.findForward("success");
	}
}