org.springframework.web.servlet.handler

## Class SimpleServletPostProcessor

- java.lang.Object
- - org.springframework.web.servlet.handler.SimpleServletPostProcessor

- All Implemented Interfaces:
    Aware, BeanPostProcessor, DestructionAwareBeanPostProcessor, ServletConfigAware, ServletContextAware

      public class SimpleServletPostProcessor
      extends Object
      implements DestructionAwareBeanPostProcessor, ServletContextAware, ServletConfigAware

  `BeanPostProcessor` that applies initialization and destruction callbacks to beans that implement the `Servlet` interface.

  After initialization of the bean instance, the Servlet `init` method will be called with a ServletConfig that contains the bean name of the Servlet and the ServletContext that it is running in.

  Before destruction of the bean instance, the Servlet `destroy` will be called.

  Note that this post-processor does not support Servlet initialization parameters. Bean instances that implement the Servlet interface are supposed to be configured like any other Spring bean, that is, through constructor arguments or bean properties.

  For reuse of a Servlet implementation in a plain Servlet container and as a bean in a Spring context, consider deriving from Spring's `HttpServletBean` base class that applies Servlet initialization parameters as bean properties, supporting both the standard Servlet and the Spring bean initialization style.

  Alternatively, consider wrapping a Servlet with Spring's `ServletWrappingController`. This is particularly appropriate for existing Servlet classes, allowing to specify Servlet initialization parameters etc.

  Since:
    1.1.5
  Author:
    Juergen Hoeller
  See Also:
    `Servlet.init(javax.servlet.ServletConfig)`, `Servlet.destroy()`, `SimpleServletHandlerAdapter`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `SimpleServletPostProcessor()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `postProcessAfterInitialization(Object bean, String beanName)` Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's `afterPropertiesSet` or a custom init-method).
    `void` | `postProcessBeforeDestruction(Object bean, String beanName)` Apply this BeanPostProcessor to the given bean instance before its destruction.
    `Object` | `postProcessBeforeInitialization(Object bean, String beanName)` Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's `afterPropertiesSet` or a custom init-method).
    `void` | `setServletConfig(ServletConfig servletConfig)` Set the `ServletConfig` that this object runs in.
    `void` | `setServletContext(ServletContext servletContext)` Set the `ServletContext` that this object runs in.
    `void` | `setUseSharedServletConfig(boolean useSharedServletConfig)` Set whether to use the shared ServletConfig object passed in through `setServletConfig`, if available.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### SimpleServletPostProcessor

          public SimpleServletPostProcessor()

  - ### Method Detail

    - #### setUseSharedServletConfig

          public void setUseSharedServletConfig(boolean useSharedServletConfig)

      Set whether to use the shared ServletConfig object passed in through `setServletConfig`, if available.

      Default is "true". Turn this setting to "false" to pass in a mock ServletConfig object with the bean name as servlet name, holding the current ServletContext.

      See Also:
        `setServletConfig(javax.servlet.ServletConfig)`

    - #### setServletContext

          public void setServletContext(ServletContext servletContext)

      Description copied from interface: `ServletContextAware`
      Set the `ServletContext` that this object runs in.

      Invoked after population of normal bean properties but before an init callback like InitializingBean's `afterPropertiesSet` or a custom init-method. Invoked after ApplicationContextAware's `setApplicationContext`.

      Specified by:
        `setServletContext` in interface `ServletContextAware`
      Parameters:
        `servletContext` - ServletContext object to be used by this object
      See Also:
        `InitializingBean.afterPropertiesSet()`, `ApplicationContextAware.setApplicationContext(org.springframework.context.ApplicationContext)`

    - #### setServletConfig

          public void setServletConfig(ServletConfig servletConfig)

      Description copied from interface: `ServletConfigAware`
      Set the `ServletConfig` that this object runs in.

      Invoked after population of normal bean properties but before an init callback like InitializingBean's `afterPropertiesSet` or a custom init-method. Invoked after ApplicationContextAware's `setApplicationContext`.

      Specified by:
        `setServletConfig` in interface `ServletConfigAware`
      Parameters:
        `servletConfig` - ServletConfig object to be used by this object
      See Also:
        `InitializingBean.afterPropertiesSet()`, `ApplicationContextAware.setApplicationContext(org.springframework.context.ApplicationContext)`

    - #### postProcessBeforeInitialization

          public Object postProcessBeforeInitialization(Object bean,
                                               String beanName)
                                                 throws BeansException

      Description copied from interface: `BeanPostProcessor`
      Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's `afterPropertiesSet` or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.
      Specified by:
        `postProcessBeforeInitialization` in interface `BeanPostProcessor`
      Parameters:
        `bean` - the new bean instance
        `beanName` - the name of the bean
      Returns:
        the bean instance to use, either the original or a wrapped one; if `null`, no subsequent BeanPostProcessors will be invoked
      Throws:
        `BeansException` - in case of errors
      See Also:
        `InitializingBean.afterPropertiesSet()`

    - #### postProcessAfterInitialization

          public Object postProcessAfterInitialization(Object bean,
                                              String beanName)
                                                throws BeansException

      Description copied from interface: `BeanPostProcessor`
      Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's `afterPropertiesSet` or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

      In case of a FactoryBean, this callback will be invoked for both the FactoryBean instance and the objects created by the FactoryBean (as of Spring 2.0). The post-processor can decide whether to apply to either the FactoryBean or created objects or both through corresponding `bean instanceof FactoryBean` checks.

      This callback will also be invoked after a short-circuiting triggered by a `InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(java.lang.Class<?>, java.lang.String)` method, in contrast to all other BeanPostProcessor callbacks.

      Specified by:
        `postProcessAfterInitialization` in interface `BeanPostProcessor`
      Parameters:
        `bean` - the new bean instance
        `beanName` - the name of the bean
      Returns:
        the bean instance to use, either the original or a wrapped one; if `null`, no subsequent BeanPostProcessors will be invoked
      Throws:
        `BeansException` - in case of errors
      See Also:
        `InitializingBean.afterPropertiesSet()`, `FactoryBean`

    - #### postProcessBeforeDestruction

          public void postProcessBeforeDestruction(Object bean,
                                          String beanName)
                                            throws BeansException

      Description copied from interface: `DestructionAwareBeanPostProcessor`
      Apply this BeanPostProcessor to the given bean instance before its destruction. Can invoke custom destruction callbacks.

      Like DisposableBean's `destroy` and a custom destroy method, this callback just applies to singleton beans in the factory (including inner beans).

      Specified by:
        `postProcessBeforeDestruction` in interface `DestructionAwareBeanPostProcessor`
      Parameters:
        `bean` - the bean instance to be destroyed
        `beanName` - the name of the bean
      Throws:
        `BeansException` - in case of errors
      See Also:
        `DisposableBean`, `AbstractBeanDefinition.setDestroyMethodName(java.lang.String)`