org.springframework.web.servlet.support

Class AbstractDispatcherServletInitializer

java.lang.Object

org.springframework.web.context.AbstractContextLoaderInitializer

org.springframework.web.servlet.support.AbstractDispatcherServletInitializer

All Implemented Interfaces:

WebApplicationInitializer

Direct Known Subclasses:

AbstractAnnotationConfigDispatcherServletInitializer

public abstract class AbstractDispatcherServletInitializer
extends AbstractContextLoaderInitializer

Base class for WebApplicationInitializer implementations that register a DispatcherServlet in the servlet context.

Concrete implementations are required to implement createServletApplicationContext(), as well as getServletMappings(), both of which get invoked from registerDispatcherServlet(ServletContext). Further customization can be achieved by overriding customizeRegistration(ServletRegistration.Dynamic).

Because this class extends from AbstractContextLoaderInitializer, concrete implementations are also required to implement AbstractContextLoaderInitializer.createRootApplicationContext() to set up a parent "root" application context. If a root context is not desired, implementations can simply return null in the createRootApplicationContext() implementation.

Since:

3.2

Author:

Arjen Poutsma, Chris Beams, Rossen Stoyanchev, Juergen Hoeller, Stephane Nicoll

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_SERVLET_NAME The default servlet name.

Fields inherited from class org.springframework.web.context.AbstractContextLoaderInitializer

logger

Constructor Summary

Constructors

Constructor and Description
AbstractDispatcherServletInitializer()

Method Summary

Modifier and Type	Method and Description
protected FrameworkServlet	createDispatcherServlet(WebApplicationContext servletAppContext) Create a DispatcherServlet (or other kind of FrameworkServlet-derived dispatcher) with the specified WebApplicationContext.
protected abstract WebApplicationContext	createServletApplicationContext() Create a servlet application context to be provided to the DispatcherServlet.
protected void	customizeRegistration(ServletRegistration.Dynamic registration) Optionally perform further registration customization once registerDispatcherServlet(ServletContext) has completed.
protected ApplicationContextInitializer<?>[]	getServletApplicationContextInitializers() Specify application context initializers to be applied to the servlet-specific application context that the DispatcherServlet is being created with.
protected Filter[]	getServletFilters() Specify filters to add and map to the DispatcherServlet.
protected abstract String[]	getServletMappings() Specify the servlet mapping(s) for the DispatcherServlet — for example "/", "/app", etc.
protected String	getServletName() Return the name under which the DispatcherServlet will be registered.
protected boolean	isAsyncSupported() A single place to control the asyncSupported flag for the DispatcherServlet and all filters added via getServletFilters().
void	onStartup(ServletContext servletContext) Configure the given ServletContext with any servlets, filters, listeners context-params and attributes necessary for initializing this web application.
protected void	registerDispatcherServlet(ServletContext servletContext) Register a DispatcherServlet against the given servlet context.
protected FilterRegistration.Dynamic	registerServletFilter(ServletContext servletContext, Filter filter) Add the given filter to the ServletContext and map it to the DispatcherServlet as follows: a default filter name is chosen based on its concrete type the asyncSupported flag is set depending on the return value of asyncSupported a filter mapping is created with dispatcher types REQUEST, FORWARD, INCLUDE, and conditionally ASYNC depending on the return value of asyncSupported

Methods inherited from class org.springframework.web.context.AbstractContextLoaderInitializer

createRootApplicationContext, getRootApplicationContextInitializers, registerContextLoaderListener

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SERVLET_NAME

public static final String DEFAULT_SERVLET_NAME

The default servlet name. Can be customized by overriding getServletName().

See Also:

Constant Field Values

Constructor Detail

AbstractDispatcherServletInitializer

public AbstractDispatcherServletInitializer()

Method Detail

onStartup

public void onStartup(ServletContext servletContext)
               throws ServletException

Description copied from interface: WebApplicationInitializer

Configure the given ServletContext with any servlets, filters, listeners context-params and attributes necessary for initializing this web application. See examples above.

Specified by:

onStartup in interface WebApplicationInitializer

Overrides:

onStartup in class AbstractContextLoaderInitializer

Parameters:

servletContext - the ServletContext to initialize

Throws:

ServletException - if any call against the given ServletContext throws a ServletException

registerDispatcherServlet

protected void registerDispatcherServlet(ServletContext servletContext)

Register a DispatcherServlet against the given servlet context.

This method will create a DispatcherServlet with the name returned by getServletName(), initializing it with the application context returned from createServletApplicationContext(), and mapping it to the patterns returned from getServletMappings().

Further customization can be achieved by overriding customizeRegistration(ServletRegistration.Dynamic) or createDispatcherServlet(WebApplicationContext).

Parameters:

servletContext - the context to register the servlet against

getServletName

protected String getServletName()

Return the name under which the DispatcherServlet will be registered. Defaults to DEFAULT_SERVLET_NAME.

See Also:

registerDispatcherServlet(ServletContext)

createServletApplicationContext

protected abstract WebApplicationContext createServletApplicationContext()

Create a servlet application context to be provided to the DispatcherServlet.

The returned context is delegated to Spring's DispatcherServlet.DispatcherServlet(WebApplicationContext). As such, it typically contains controllers, view resolvers, locale resolvers, and other web-related beans.

See Also:

registerDispatcherServlet(ServletContext)

createDispatcherServlet

protected FrameworkServlet createDispatcherServlet(WebApplicationContext servletAppContext)

Create a DispatcherServlet (or other kind of FrameworkServlet-derived dispatcher) with the specified WebApplicationContext.

Note: This allows for any FrameworkServlet subclass as of 4.2.3. Previously, it insisted on returning a DispatcherServlet or subclass thereof.

getServletApplicationContextInitializers

protected ApplicationContextInitializer<?>[] getServletApplicationContextInitializers()

Specify application context initializers to be applied to the servlet-specific application context that the DispatcherServlet is being created with.

Since:

4.2

See Also:

createServletApplicationContext(), FrameworkServlet.setContextInitializers(org.springframework.context.ApplicationContextInitializer<?>...), AbstractContextLoaderInitializer.getRootApplicationContextInitializers()

getServletMappings

protected abstract String[] getServletMappings()

Specify the servlet mapping(s) for the DispatcherServlet — for example "/", "/app", etc.

See Also:

registerDispatcherServlet(ServletContext)

getServletFilters

protected Filter[] getServletFilters()

Specify filters to add and map to the DispatcherServlet.

Returns:

an array of filters or null

See Also:

registerServletFilter(ServletContext, Filter)

registerServletFilter

protected FilterRegistration.Dynamic registerServletFilter(ServletContext servletContext,
                                                           Filter filter)

Add the given filter to the ServletContext and map it to the DispatcherServlet as follows:

• a default filter name is chosen based on its concrete type
• the asyncSupported flag is set depending on the return value of asyncSupported
• a filter mapping is created with dispatcher types REQUEST, FORWARD, INCLUDE, and conditionally ASYNC depending on the return value of asyncSupported

If the above defaults are not suitable or insufficient, override this method and register filters directly with the ServletContext.

Parameters:

servletContext - the servlet context to register filters with

filter - the filter to be registered

Returns:

the filter registration

isAsyncSupported

protected boolean isAsyncSupported()

A single place to control the asyncSupported flag for the DispatcherServlet and all filters added via getServletFilters().

The default value is "true".

customizeRegistration

protected void customizeRegistration(ServletRegistration.Dynamic registration)

Optionally perform further registration customization once registerDispatcherServlet(ServletContext) has completed.

Parameters:

registration - the DispatcherServlet registration to be customized

See Also:

registerDispatcherServlet(ServletContext)