selectcourseaction.java

使用struts+spring+JDBC 实现的学生选课管理系统

package bit.jeffy.action;

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

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 org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import bit.jeffy.entity.SelectCourse;
import bit.jeffy.service.SelectCourseDao;

public class SelectCourseAction extends Action{
	private SelectCourseDao selectcoursedao;
	
	public ActionForward execute(ActionMapping map, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		// TODO 自动生成方法存根
		ActionMessages errors = new ActionMessages();
		
		Long uid = (Long)request.getSession().getAttribute("curr_stu_id");
		if(uid == null){
			errors.add("fail_1",new ActionMessage("SelectCourseAction.a"));
			saveErrors(request,errors);
			return (map.getInputForward());
		}
		
		String tmp = (String)request.getParameter("scid");
		long scid = Long.parseLong(tmp);
		if(scid < 0){
			errors.add("fail_2",new ActionMessage("SelectCourseAction.b"));
			saveErrors(request,errors);
			return (map.getInputForward());
		}
		
		tmp = (String)request.getParameter("tid");
		long tid = Long.parseLong(tmp);
		if(tid < 0){
			errors.add("fail_3",new ActionMessage("SelectCourseAction.c"));
			saveErrors(request,errors);
			return (map.getInputForward());
		}
		
		SelectCourse sc = new SelectCourse();
		sc.setStudent_id(uid.longValue());
		sc.setTeacher_id(tid);
		sc.setCourse_id(scid);
		
		if(selectcoursedao.add(sc)){
			return (map.getInputForward());
		}else{
			errors.add("fail_4",new ActionMessage("SelectCourseAction.d"));
			saveErrors(request,errors);
			return (map.getInputForward());
		}

	}
	public SelectCourseDao getSelectcoursedao() {
		return selectcoursedao;
	}
	public void setSelectcoursedao(SelectCourseDao selectcoursedao) {
		this.selectcoursedao = selectcoursedao;
	}

}