studentaction.java

struts+hibernate在线考试系统exam

package cn.hxex.exam.action;

import java.io.IOException;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import cn.hxex.exam.dao.ClassesDAO;
import cn.hxex.exam.dao.DAOFactory;
import cn.hxex.exam.dao.StudentDAO;
import cn.hxex.exam.dao.UserDAO;
import cn.hxex.exam.form.StudentForm;
import cn.hxex.exam.model.Classes;
import cn.hxex.exam.model.Student;
import cn.hxex.exam.model.User;
import cn.hxex.exam.struts.BaseAction;
import cn.hxex.exam.util.HxexBeanUtils;

/**
 * The action about student
 * 
 * @struts.action
 * 	name="studentForm"
 *  path="/manage/student"
 *  scope="request"
 *  input="/manage/student_add.jsp"
 *  validate="false"
 *  parameter="p"
 * 
 * @struts.action-forward 
 *  name="add" 
 *  path="/manage/student_add.jsp" 
 *  
 * @struts.action-forward 
 *  name="update" 
 *  path="/manage/student_update.jsp" 
 *  
 * @struts.action-forward 
 *  name="list" 
 *  path="/manage/student_list.jsp" 
 * 
 * @author galaxy
 *
 */
public class StudentAction extends BaseAction 
{
	/**
	 * 获得班级学生的方法
	 */
	public ActionForward list( ActionMapping mapping, 
			ActionForm form, 
			HttpServletRequest request, 
			HttpServletResponse response ) 
			throws IOException, ServletException
	{
		// 得到班级的ID值
		String classesid = request.getParameter( "classesid" );
		
		// 得到班级DAO对象
		ClassesDAO dao = DAOFactory.getDao( ClassesDAO.class );
		// 得到班级信息
		Classes c = dao.findById( classesid, false );

		// 将班级信息设置为请求的属性
		request.setAttribute( "classes", c );
	
		// 跳转到学生信息列表页面
		return mapping.findForward( "list" );
	}
	
	/**
	 * 进入录入学生信息页面
	 */
	public ActionForward addin( ActionMapping mapping, 
			ActionForm form, 
			HttpServletRequest request, 
			HttpServletResponse response ) 
			throws IOException, ServletException
	{
		// 得到班级的ID值
		String classesid = request.getParameter( "classesid" );
		
		// 得到班级信息
		ClassesDAO dao = DAOFactory.getDao( ClassesDAO.class );
		Classes c = dao.findById( classesid, false );
		request.setAttribute( "classes", c );
		
		// 跳转到录入学生信息页面
		return mapping.findForward( "add" );
	}

	/**
	 * 保存学生信息
	 */
	public ActionForward save( ActionMapping mapping, 
			ActionForm form, 
			HttpServletRequest request, 
			HttpServletResponse response ) 
			throws IOException, ServletException
	{
		// 得到学生对象
		Student s = HxexBeanUtils.copyProperties( new Student(), form );

		// 得到UserDAO对象的实例
		UserDAO dao = DAOFactory.getDao( UserDAO.class );
		// 判断用户名是否存在
		if( dao.getUserByName( s.getName() )==null )
		{
			// 得到班级的ID
			String classesid = request.getParameter( "classesid" );
			
			// 得到班级对象
			ClassesDAO classesdao = DAOFactory.getDao( ClassesDAO.class );
			Classes c = classesdao.findById( classesid, false );

			// 保存学生对象
			s.setClasses( c );
			dao.makePersistent( s );
			
			// 设置提示信息
			addMessage( request, "student.msg.add.success" );
			
			// 清空Form中的值
			StudentForm student = (StudentForm)form;
			student.setName( null );
			student.setPassword( null );
			student.setFullname( null );
		}
		else
		{
			addMessage( request, "student.msg.add.nameexist" );
		}
		
		// 返回到学生信息录入页面
		return addin( mapping, form, request, response );
	}

	/**
	 * 进入学生信息修改页面的Action方法
	 */
	public ActionForward updatein( ActionMapping mapping, 
			ActionForm form, 
			HttpServletRequest request, 
			HttpServletResponse response ) 
			throws IOException, ServletException
	{
		// 得到用户传递的参数
		StudentForm student = (StudentForm)form;
		
		// 得到StudentDAO对象的实例
		StudentDAO dao = DAOFactory.getDao( StudentDAO.class );
		// 得到学生对象
		Student s = dao.findById( student.getId(), false );
		request.setAttribute( "studentForm", s );
		request.setAttribute( "classes", s.getClasses() );
		
		// 跳转到学生信息修改页面
		return mapping.findForward( "update" );
	}

	/**
	 * 保存学生信息
	 */
	public ActionForward update( ActionMapping mapping, 
			ActionForm form, 
			HttpServletRequest request, 
			HttpServletResponse response ) 
			throws IOException, ServletException
	{
		// 得到学生对象
		Student s = HxexBeanUtils.copyProperties( new Student(), form );

		// 得到UserDAO对象的实例
		UserDAO dao = DAOFactory.getDao( UserDAO.class );
		User u = dao.getUserByName( s.getName() );
		// 判断用户名是否存在
		if( u == null || u.getId().equals( s.getId() ) )
		{
			if( u==null )
				u = dao.findById( s.getId(), false );
			
			if( u != null )
			{
				Student stu = (Student)u;
				stu.setName( s.getName() );
				stu.setPassword( s.getPassword() );
				stu.setFullname( s.getFullname() );
				
				// 设置提示信息
				addMessage(request, "student.msg.update.success");
			}
			else
			{
				// 设置提示信息
				addMessage(request, "student.msg.update.notexist");
			}
		}
		else
		{
			// 设置用户名重复提示信息
			addMessage( request, "student.msg.add.nameexist" );
			if( s.getId()!=null && s.getId().length()>0 )
			{
				// 返回学生信息修改页面
				return updatein( mapping, form, request, response );
			}
		}
		
		// 返回到学生信息列表页面
		return list( mapping, form, request, response );
	}
	
	/**
	 * 删除学生信息功能
	 */
	public ActionForward delete( ActionMapping mapping, 
			ActionForm form, 
			HttpServletRequest request, 
			HttpServletResponse response ) 
			throws IOException, ServletException
	{
		// 得到用户传递的参数
		StudentForm student = (StudentForm)form;
		
		// 得到要删除的学生对象
		StudentDAO dao = DAOFactory.getDao( StudentDAO.class );
		Student s = dao.findById( student.getId(), false );
		if( s!=null )
		{
			// 删除学生对象
			Classes c = s.getClasses();
			c.getStudents().remove( s );
			dao.makeTransient( s );
			
			// 设置提示信息
			addMessage( request, "student.msg.delete.success" );
			
			request.setAttribute( "classes", c );
		}
		else
		{
			addMessage( request, "student.msg.update.notexist" );
		}
		
		return mapping.findForward( "list" );
	}
}