CODEWITHSUNDEEP
javaspring
Count
Count

Reputation: 1423

Automate the new spring initiated beans to be added to the application

I am working on a shopping-cart application

I have created one product bean and all the new products are being added through spring context given below

<bean id="product1" class="entities.Product">
    <property name="name" value="product1" />
</bean>
<bean id="product2" class="entities.Product">
    <property name="name" value="product2" />
</bean>
.....

My product team is adding one bean in the spring context every-time they have a new product

I am getting the bean using the following code

Product product = (Product) context.getBean("product1");
Product product2 = (Product) context.getBean("product2");

but every time they add the product I need to change my code to my display product set

How can I automate so that I can know number of product in the XML before hand or have every new product handled automatically

I am using this currently which is working fine but I am sure there is better solution to it 

Set<Product> products = new HashSet<Product>();
    int i=1;

        while(true){
            try{
            products.add((Product) context.getBean("product"+i));
            }
            catch(NoSuchBeanDefinitionException n){
                System.out.println(n);
                break;
            }
            i++;
        }



    for(Product p : products)
        System.out.println(p.getName());

Upvotes: 0

Views: 115

Answers (3)

M. Deinum
M. Deinum

Reputation: 124506

You can use dependency injection for that. In your class where you need to Product instances simple put a field which is a collection (List<Product>, Set<Product> or Map<String,Product>) or an array (Product[] and put @Autowired or @Inject on that field. 

public MyClass {

    @Autowired
    private List<Product> products;

}

This will instruct the application context to inject all beans of the type Product into that collection. Now in the method where you need it you can simply access the collection.

As explained here in the reference guide.

Upvotes: 0

Andrei Stefan
Andrei Stefan

Reputation: 52368

Use, instead, getBeansOfType() method that returns a Map: the key is the name of the bean, the value is the bean instance:

    Map map = context.getBeansOfType(Product.class);
    for (Iterator iterator = map.keySet().iterator(); iterator.hasNext();) {
        String beanName = (String) iterator.next();
        System.out.println(beanName + " for bean instance: " + map.get(beanName));
    }

Upvotes: 1

Rohan
Rohan

Reputation: 3078

You can use context.getBeanNamesForType(Product.class) to get the names of beans of specified type.
eg:

String names[] = context.getBeanNamesForType(Product.class);
for(int i=0;i<names.length;i++)
  products.add((Product) context.getBean(names[i]));

More on getBeanNamesForType

Upvotes: 4

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