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Creating and Configuring Beans
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In order to be created, beans require the following: A Java class definition A configuration The Java class definition is usually a regular Java class following bean conventions: properties should be accessible through getter/setter pairs. Spring, however, allows any class to become a bean, and therefore any kind of Java object can be managed by the container and referenced by other beans, exactly like regular beans. Spring also allows the beans to define a constructor with some parameters, so that the bean properties are initialized in a more straightforward way. As previously indicated, a typical bean configuration is written in an XML file, which contains bean definition entries. (Note that configurations can also be achieved programmatically, but we will not enter into this level of detail in this book.) Each bean entry defines the name (or id) and the Java class of the bean. At this point, the bean can be referenced by other bean definition entries. In addition, several configuration parameters can be added to the entries such as the values of the properties, the values of the constructor s parameters, lifecycle management configurations, etc.
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A First Bean Definition
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As a simple example, we write the class in Listing 6-1.
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CHAPTER 6 SPRING AOP
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Listing 6-1. A First Bean Definition package aop.spring; public class ExampleBean { private AnotherBean beanOne; private YetAnotherBean beanTwo; private int i; public void setBeanOne(AnotherBean beanOne) { this.beanOne = beanOne; } public void setBeanTwo(YetAnotherBean beanTwo) { this.beanTwo = beanTwo; } public void setIntegerProperty(int i) { this.i = i; } } This class contains two references towards AnotherBean and YetAnotherBean, and an integer property i. It also defines setters for all of them. In order to make this class recognized as a bean by a Spring bean factory or application context, we must write the XML configuration in Listing 6-2. Listing 6-2. A First Configuration 1 <bean id="exampleBean" class="aop.spring.ExampleBean"> 2 <property name="beanOne"><ref bean="anotherExampleBean"/></property> 3 <property name="beanTwo"><ref bean="yetAnotherBean"/></property> 4 <property name="integerProperty"><value>1</value></property> 5 </bean> In this configuration, we create a new bean named exampleBean (id attribute of the bean element), which is an instance of the class aop.spring.ExampleBean (class attribute of the bean element) defined previously. The initialization of the properties is done through the property elements. For primary properties, the value element will be used to create a primitive value (line 4). For references, a ref element will be used to reference another bean (lines 2 and 3). Of course, the referenced beans must be defined elsewhere in a similar manner. A minimal configuration is as shown in Listing 6-3. Listing 6-3. A First Configuration (Continued) <bean id="anotherExampleBean" class="aop.spring.AnotherBean"/> <bean id="yetAnotherBean" class="aop.spring.YetAnotherBean"/>
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In Spring, beans are singletons by default. In order to change this strategy, and to make the factory create a new instance each time a bean is accessed, the configuration should set the singleton attribute to false simply by changing the first line of the configuration of Listing 6-2: <bean id="exampleBean" class="aop.spring.ExampleBean" singleton="false">
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An Alternative Definition
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As stated previously, an alternative to this is to use constructor initialization. In this case, the bean class is defined as shown in Listing 6-4. Listing 6-4. A Constructor-based Alternative Definition of Our First Bean package aop.spring; public class ExampleBean { private AnotherBean beanOne; private YetAnotherBean beanTwo; private int i; public ExampleBean(AnotherBean anotherBean, YetAnotherBean yetAnotherBean, int i) { this.beanOne = anotherBean; this.beanTwo = yetAnotherBean; this.i = i; } } And the configuration must be as shown in Listing 6-5. Listing 6-5. Constructor-based Configuration <bean id="exampleBean" class="aop.spring.ExampleBean"> <constructor-arg><ref bean="anotherExampleBean"/></constructor-arg> <constructor-arg><ref bean="yetAnotherBean"/></constructor-arg> <constructor-arg type="int"><value>1</value></constructor-arg> </bean>
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Accessing the Bean
Once defined, a bean must be accessed through a factory. The BeanFactory class defines the following methods: boolean containsBean(String): Checks that the factory contains a given bean name Object getBean(String): Instantiates/accesses a given bean name Object getBean(String,Class): Instantiates/accesses a given bean name and casts it to a given class
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