有人知道如何在JSP上使用Optional对象吗?

我有一堂课:

@Entity
@Table(name = "projects")
public class Project {

@Expose
@ManyToOne
@JoinColumn(name = "customer_id")
private Customer endCustomer;
....

public Optional<Customer> getEndCustomer() {
    return Optional.ofNullable(endCustomer);
}

public void setEndCustomer(Customer endCustomer) {
    this.endCustomer = endCustomer;
}
....
}


我有jsp:



<td>
   <form:select class="form-control" id="endCustomer" path="endCustomer.id" tabindex="4">
       <form:options items="${endCustomers}" itemValue="id" itemLabel="name"/>
   </form:select>
</td>





由于明显的原因,该部分不起作用:path="endCustomer.id"

有解决方法吗?
谢谢!

最佳答案

试试这个

<td>
   <form:select class="form-control" id="endCustomer" path="${endCustomer.get().id}" tabindex="4">
       <form:options items="${endCustomers}" itemValue="id" itemLabel="name"/>
   </form:select>
</td>


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07-26 07:49