Introduction and Context Servlet container

Servlet container start to create a number of objects, such as Servlet, filter, listener, spring, etc. So how do these objects?

Here in the Servlet (or Filter, or Listener) in the spring of the IOC to use the container create the default Servlet container spring container object, injected into the Servlet Context in, Servlet Context object is injected into the session object, session object is injected into the request object, request object is injected into the Servlet object, (the injection is not very standard, is mass parameters, or directly pay the value of the property). Layers can be dependent on spring container object.

WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext (request.getSession (). GetServletContext ());

So you can directly remove the Web Application Context Servlet Context object:

WebApplicationContext webApplicationContext = (WebApplicationContext) servletContext.getAttribute (WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);

In fact Web Application ContextUtils.getWebApplicationContext is to use the above code to achieve, recommended above, the static method above

Note: use the web Application Context.getBean ("ServiceName") when, in front of forced conversion to use interface, if the implementation class will be reported using the type conversion error. Such as:

LUserService userService = (LUserService) webApplicationContext.getBean ("userService");







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