如何使用CDI用参数化构造函数注入类的实例（仅限Java EE 6）

Question

    public class A 
    {
        public A(boolean deliverFromLocalWarehouse)
        {
            if(deliverFromLocalWarehouse)
            {
                wareHouseId = new Integer(10); 
            }
            else 
            {
                wareHouseId = new Integer(100);
            }
        }

        public void deliver()
        {
            //get wareHouse address by Id and initiate delivery.   
        }

        private Integer wareHouseId = null;
    }

    public class B 
    {

        @Inject
        private A a;
    }

谢谢Srikrishna Kalavacharla

Answer 1

如果构造函数参数应该来自一个bean，我认为您可以简单地对其进行注释：

public A(@Inject boolean localWarehouse) { ...

并将其注入

@Inject A a;

如果需要一个的两个不同实例（具有不同的构造函数参数），可以对它们进行子类化：

public AForLocalWarehouse extends A {
    public AForLocalWarehouse() {
        super(true);
    }
}

@Inject AForLocalWarehouse a;

@Produces @LocalWarehouse
public A localWarehouse() { return new A(true); }

@Produces @RemoteWarehouse
public A remoteWarehouse() { return new A(false); }

@Inject @LocalWarehouse A a;
@Inject @RemoteWarehouse A a;