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Struts2でHibernateを使用してコレクションマッピングを実行するために、インターフェイスを使用しAddressCertificateクラスオブジェクトなどの異なるPOJOを使用する方法は?ModelDrivenAction

コードサンプルは次のとおりです。

 package com.acv.in.action;
 import java.util.HashSet;
 import java.util.Set;
 import com.acv.in.bean.Student;
 import com.acv.in.dao.DAO;
 import com.acv.in.dao.DAOImpl;
 import com.opensymphony.xwork2.ActionSupport;
 import com.opensymphony.xwork2.ModelDriven;

 public class UserActionImpl extends ActionSupport implements  ModelDriven<Student>{

private static final long serialVersionUID = 1L;
Set<String> docList= new HashSet<String>();
DAO dao= new DAOImpl();
private Student student= new Student();
 
@Override
public Student getModel() {
    // TODO Auto-generated method stub
    return student;
}

返品方法AddressCertificateオブジェクトは?

public UserActionImpl()
{
    
}

public String add() {
  System.out.println("inside add");
  dao.insert(student);
    return "success";
}

 
public String delete() {
    // TODO Auto-generated method stub
    return "success";
}


public String update() {
    // TODO Auto-generated method stub
    return "success";
}

 
public String getById() {
    // TODO Auto-generated method stub
    return "success";
}


public String getAll() {
    // TODO Auto-generated method stub
    return "success";
}

public Set<String> getDocList() {
    return docList;
}

public void setDocList(Set<String> docList) {
    this.docList = docList;
}

public Student getStudent() {
    return student;
}

public void setStudent(Student student) {
    this.student = student;
}


public DAO getDao() {
    return dao;
}

public void setDao(DAO dao) {
    this.dao = dao;
}

 
}
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