The instantiation of the spring Learning Note bean

One, there are 3 instances of the Bean method,

1. Constructor instantiation

2. Static Factory method instantiation

3. Instance Factory method instantiation

Second, use the constructor to instantiate

<bean id= "Shundao" class= "test. Ftpdao ">

ID or name to specify the name of the bean, class to specify the type of bean

Iii. instantiation of Static factory methods

<bean id= "Shundao" class= "test. Ftpdao "factory-method=" getinstance ">

Factory-method is used to specify a method for creating a bean object in a factory, which must be static

Iv. Instance Factory method instantiation

<bean id= "Cal1" class= "Java.util.Calendar" factory-method= "getinstance" ></bean>
<bean id= "Cal3" class= "Java.util.Date" factory-bean= "Cal1" factory-method= "GetTime" ></bean>

The instantiation of the spring Learning Note bean