xuanke.java

学生选课管理系统 struts hibernate

package com.action;
import java.util.Iterator;

import javax.servlet.http.*;

import org.apache.struts.action.*;

import com.hibernate.BusinessService;
import com.hibernate.Course;
import com.hibernate.Student;
import com.hibernate.StudentCourse;

public class xuanke extends Action{
	public ActionForward execute(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response) throws Exception
	{	
		int id=Integer.parseInt(request.getParameter("id"));
		HttpSession session=request.getSession();	
		Student s=(Student)session.getAttribute("student");
		BusinessService bs=new BusinessService();
		Course c=bs.loadCourse(id);		
		s=bs.loadStudent(s.getId());
		Iterator it = s.getStudentCourses().iterator();
		while(it.hasNext())
		  {
			  StudentCourse sc=(StudentCourse)it.next();
			  if(sc.getCourse().getName().equals(c.getName()))
				  return (mapping.findForward("error")); 		  
		  }
		StudentCourse sc=new StudentCourse();	
			sc.setCourse(c);
			sc.setStudent(s);
			if(c.getNumOfStudents().intValue()<c.getNumOfSeats().intValue())
				c.setNumOfStudents(new Integer(c.getNumOfStudents().intValue()+1));
			else
				return (mapping.findForward("error"));
			bs.saveCourse(c);
			s.getStudentCourses().add(sc);
			bs.saveStudent(s);
			return (mapping.findForward("addok"));
	}
}