servlet写的增删改查和图片上传

分老师与学生登录，老师可增删改查学生信息和上传图片，数据库用的是mysql

package dome.bean;

public class classroom 
{
	private int crId;
	private String crName;
	private String crTeacher;
	public int getCrId（） {
		return crId;
	}
	public void setCrId（int crId） {
		this.crId = crId;
	}
	public String getCrName（） {
		return crName;
	}
	public void setCrName（String crName） {
		this.crName = crName;
	}
	public String getCrTeacher（） {
		return crTeacher;
	}
	public void setCrTeacher（String crTeacher） {
		this.crTeacher = crTeacher;
	}
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2015-11-09 15:59  student\
     文件         955  2015-09-09 13:28  student\.classpath
     文件        1040  2015-09-08 11:59  student\.project
     目录           0  2015-11-09 15:59  student\.settings\
     文件         503  2015-09-08 11:59  student\.settings\.jsdtscope
     文件         364  2015-09-08 11:59  student\.settings\org.eclipse.jdt.core.prefs
     文件         548  2015-09-09 10:39  student\.settings\org.eclipse.wst.common.component
     文件         345  2015-09-08 11:59  student\.settings\org.eclipse.wst.common.project.facet.core.xml
     文件          49  2015-09-08 11:59  student\.settings\org.eclipse.wst.jsdt.ui.superType.container
     文件           6  2015-09-08 11:59  student\.settings\org.eclipse.wst.jsdt.ui.superType.name
     目录           0  2015-11-09 15:59  student\build\
     目录           0  2015-11-09 15:59  student\build\classes\
     文件         137  2015-09-09 14:56  student\build\classes\aa.properties
     目录           0  2015-11-09 15:59  student\build\classes\dome\
     目录           0  2015-11-09 15:59  student\build\classes\dome\bean\
     文件         924  2015-09-25 13:07  student\build\classes\dome\bean\classroom.class
     文件        1685  2015-09-25 13:07  student\build\classes\dome\bean\student.class
     文件        1494  2015-09-25 13:07  student\build\classes\dome\bean\Teacher.class
     目录           0  2015-11-09 15:59  student\build\classes\dome\dao\
     文件         226  2015-09-25 13:07  student\build\classes\dome\dao\classroomdao.class
     文件         155  2015-09-25 13:07  student\build\classes\dome\dao\houtaidao.class
     目录           0  2015-11-09 15:59  student\build\classes\dome\dao\impl\
     文件        1905  2015-09-25 13:07  student\build\classes\dome\dao\impl\classroomimpl.class
     文件        1190  2015-09-25 13:07  student\build\classes\dome\dao\impl\classroomimplTest.class
     文件        1650  2015-09-25 13:07  student\build\classes\dome\dao\impl\houtaiimpl.class
     文件         995  2015-09-25 13:07  student\build\classes\dome\dao\impl\houtaiimplTest.class
     文件        6097  2015-09-25 13:07  student\build\classes\dome\dao\impl\studentimpl.class
     文件        1176  2015-09-25 13:07  student\build\classes\dome\dao\impl\studentimplTest.class
     文件         460  2015-09-25 13:07  student\build\classes\dome\dao\studentdao.class
     目录           0  2015-11-09 15:59  student\build\classes\dome\filter\
     文件        1863  2015-09-25 13:07  student\build\classes\dome\filter\loginfilter.class
............此处省略68个文件信息