classlogic.java

这是用JSP 实现的一个学生选课系统,功能相对来说还是相当完备.

package com.student.logic;

import com.student.dao.HbmDAO;
import com.student.actionform.ClassActionForm;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import com.student.vo.BaseInfo;
import com.student.assistvo.AssistVo;
import com.student.vo.User;
import com.student.dao.DAOException;
import com.student.vo.ClassInfo;
import com.student.vo.SelectInfo;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class ClassLogic {
  private HbmDAO dao;
  private ClassActionForm form;
  public ClassLogic(ClassActionForm form) {
    dao = new HbmDAO();
    dao.setAutoClose(false);
    this.form = form;
  }
  public void getClasses()
  {
      String str = "from ClassInfo";
      List classes = dao.list(str);
      form.setClasses(classes);
  }
  public void addClass()
  {
   ClassInfo classs = new ClassInfo();
   classs.setClassCredit(new Integer(0));
   classs.setClassName("English");
   classs.setClassRoom("303");
   classs.setClassTeacher("Wang");
   classs.setClassTime("Mon,Wen");

   form.getClasses().add(classs);

  }
  public void saveClass()
  {
        List classes = form.getClasses();
        for (Iterator iter = classes.iterator(); iter.hasNext(); ) {
          ClassInfo item = (ClassInfo)iter.next();
          if(item.getClassUID().equals(new Long(0)))
          {
            item.setClassUID(null);
          }
          try {
            dao.store(item);
          }
          catch (DAOException ex) {
            ex.printStackTrace();
          }
        }
  }
  public void deleteClass()
  {
        Long uid = form.getDeleteUID();
        try {
          String str = "select choose from SelectInfo choose where classUID=" + uid.toString();
          List chooses = dao.list(str);
          if(chooses.size()>0)
          {
            SelectInfo choose = (SelectInfo)chooses.get(0);
            dao.remove(choose);
          }
          dao.remove(ClassInfo.class, uid);
        }
        catch (DAOException ex) {
          ex.printStackTrace();
        }
  }
   public void closeDAO()
   {
         dao.closeSession();
         dao = null;
  }


}