dependency inject servlet listener

Question

In my Stripes app I define the following class:

MyServletListener implements ServletContextListener, HttpSessionListener, HttpSessionAttributeListener {

  private SomeService someService;

  private AnotherService anotherService;

  // remaining implementation omitted
}

The service layer of this app uses Spring to define and wire together some service beans in an XML file. I would like to inject the beans that implement SomeService and AnotherService into MyServletListener, is this possible?

score 25 · Answer 1 · edited Apr 01 '11 at 12:54

25

Something like this should work:

public class MyServletListener implements ServletContextListener, HttpSessionAttributeListener, HttpSessionListener {
    @Autowired
    private SomeService someService;        
    @Autowired
    private AnotherService anotherService; 

    public void contextInitialized(ServletContextEvent sce) {
        WebApplicationContextUtils
            .getRequiredWebApplicationContext(sce.getServletContext())
            .getAutowireCapableBeanFactory()
            .autowireBean(this);
    }

    ...
}

Your listener should be declared after Spring's ContextLoaderListener in web.xml.

edited Apr 01 '11 at 12:54

Dónal

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answered Apr 01 '11 at 09:04

axtavt

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@Don: `contextInitalized(ServletContextEvent)` is defined on [`ServletContextListener`](http://download.oracle.com/docs/cd/E17802_01/products/products/servlet/2.3/javadoc/javax/servlet/ServletContextListener.html#contextInitialized(javax.servlet.ServletContextEvent)) – ig0774 Apr 01 '11 at 13:03
1

Important : In web.xml ContextLoaderListener must be loaded before MyServletListener. – Nico Apr 15 '13 at 17:53

score 12 · Answer 2 · answered Oct 30 '13 at 13:25

Little bit shorter and simpler is to use SpringBeanAutowiringSupport class.
Than all you have to do is this:

SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);

So using example from axtavt:

public class MyServletListener implements ServletContextListener, HttpSessionAttributeListener, HttpSessionListener {
    @Autowired
    private SomeService someService;        
    @Autowired
    private AnotherService anotherService; 

    public void contextInitialized(ServletContextEvent sce) {
        SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);
    }

    ...
}

dependency inject servlet listener

2 Answers2

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