Java 8可选组件和JSP

Question

有谁知道如何在JSP上使用可选对象吗？

我有一门课：

@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>

​

这个部分不起作用的原因很明显：path="endCustomer.id"

有解决办法吗？谢谢!

Answer 1

试试这样的东西

<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>

相关问题How to access an object