To have some collection items outlined in rows you can use
public void groupCollection(String collectionName) method of
XLSTransformer class.
For example to outline
staff in
department object we can use code like
Department department = new Department("IT");
//... initialization is skipped here
Map beans = new HashMap();
beans.put("department", department);
XLSTransformer transformer = new XLSTransformer();
// set outlines for rows of "department.staff" collection
transformer.groupCollection("department.staff");
transformer.transformXLS(templateFileName, beans, destFileName);
So here we invoke
transformer.groupCollection("department.staff") to group/outline rows of exported collection.
Take a look at Complex Bean Export sample for real example.