Examples of MethodInvokingFactoryBean

• org.springframework.beans.factory.config.MethodInvokingFactoryBean
  {@link FactoryBean} which returns a value which is the result of a static or instancemethod invocation. For most use cases it is better to just use the container's built-in factory method support for the same purpose, since that is smarter at converting arguments. This factory bean is still useful though when you need to call a method which doesn't return any value (for example, a static class method to force some sort of initialization to happen). This use case is not supported by factory methods, since a return value is needed to obtain the bean instance.

  Note that as it is expected to be used mostly for accessing factory methods, this factory by default operates in a singleton fashion. The first request to {@link #getObject} by the owning bean factory will cause a method invocation,whose return value will be cached for subsequent requests. An internal {@link #setSingleton singleton} property may be set to "false", to cause thisfactory to invoke the target method each time it is asked for an object.

  A static target method may be specified by setting the {@link #setTargetMethod targetMethod} property to a String representing the staticmethod name, with {@link #setTargetClass targetClass} specifying the Class thatthe static method is defined on. Alternatively, a target instance method may be specified, by setting the {@link #setTargetObject targetObject} property as the targetobject, and the {@link #setTargetMethod targetMethod} property as the name of themethod to call on that target object. Arguments for the method invocation may be specified by setting the {@link #setArguments arguments} property.

  This class depends on {@link #afterPropertiesSet()} being called onceall properties have been set, as per the InitializingBean contract.

  An example (in an XML based bean factory definition) of a bean definition which uses this class to call a static factory method:

   <bean id="myObject" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="staticMethod"><value>com.whatever.MyClassFactory.getInstance</value></property> </bean>

  An example of calling a static method then an instance method to get at a Java system property. Somewhat verbose, but it works.

   <bean id="sysProps" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetClass"><value>java.lang.System</value></property> <property name="targetMethod"><value>getProperties</value></property> </bean> <bean id="javaVersion" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetObject"><ref local="sysProps"/></property> <property name="targetMethod"><value>getProperty</value></property> <property name="arguments"> <list> <value>java.version</value> </list> </property> </bean>

  @author Colin Sampaleanu @author Juergen Hoeller @since 21.11.2003

Examples of org.springframework.beans.factory.config.MethodInvokingFactoryBean

Examples of org.springframework.beans.factory.config.MethodInvokingFactoryBean

Examples of org.springframework.beans.factory.config.MethodInvokingFactoryBean