急100分.解决办法

<input type="text" name="stu.subjects.subjectsName"/>

private int subjectsId;private String subjectsName;

private int stuId;    private String stuName;    private String stuAddress;    private Date stuJoinTime;    private Card card;    private Class clss;    private Set<Subjects> subjects = new HashSet<Subjects>();

private Student stu = new Student();