Ajax 实现三级联动
.................\AjaxOptions
.................\...........\.classpath
.................\...........\.mymetadata
.................\...........\.project
.................\...........\src
.................\...........\...\com
.................\...........\...\...\SelectCourses.java
.................\...........\...\...\SelectTeachers.java
.................\...........\...\dao
.................\...........\...\...\TDao.java
.................\...........\...\test
.................\...........\...\....\Test.java
.................\...........\...\util
.................\...........\...\....\ChangEncording.java
.................\...........\...\....\DatabaseConnection.java
.................\...........\...\....\Encoding.java
.................\...........\WebRoot
.................\...........\.......\index.jsp
.................\...........\.......\META-INF
.................\...........\.......\........\MANIFEST.MF
.................\...........\.......\test.jsp
.................\...........\.......\WEB-INF
.................\...........\.......\.......\classes
.................\...........\.......\.......\.......\com
.................\...........\.......\.......\.......\...\SelectCourses.class
.................\...........\.......\.......\.......\...\SelectTeachers.class
.................\...........\.......\.......\.......\dao
.................\...........\.......\.......\.......\...\TDao.class
.................\...........\.......\.......\.......\test
.................\...........\.......\.......\.......\....\Test.class
.................\...........\.......\.......\.......\util
.................\...........\.......\.......\.......\....\ChangEncording.class
.................\...........\.......\.......\.......\....\DatabaseConnection.class
.................\...........\.......\.......\.......\....\Encoding.class
.................\...........\.......\.......\lib
.................\...........\.......\.......\...\struts.jar
.................\...........\.......\.......\web.xml
.................\db
.................\..\teacherdb.mdf
.................\..\teacherdb_log.ldf