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## org.springframework.web.servlet.config.annotation
Interface WebMvcConfigurer

All Known Implementing Classes:
  WebMvcConfigurerAdapter

    public interface WebMvcConfigurer

Defines callback methods to customize the Java-based configuration for Spring MVC enabled via `@EnableWebMvc`.

`@EnableWebMvc`-annotated configuration classes may implement this interface to be called back and given a chance to customize the default configuration. Consider extending `WebMvcConfigurerAdapter`, which provides a stub implementation of all interface methods.

Since:
  3.1
Author:
  Rossen Stoyanchev, Keith Donald, David Syer

Method Summary
`void` | `addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers)` Add resolvers to support custom controller method argument types.
`void` | `addFormatters(FormatterRegistry registry)` Add `Converter`s and `Formatter`s in addition to the ones registered by default.
`void` | `addInterceptors(InterceptorRegistry registry)` Add Spring MVC lifecycle interceptors for pre- and post-processing of controller method invocations.
`void` | `addResourceHandlers(ResourceHandlerRegistry registry)` Add handlers to serve static resources such as images, js, and, css files from specific locations under web application root, the classpath, and others.
`void` | `addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers)` Add handlers to support custom controller method return value types.
`void` | `addViewControllers(ViewControllerRegistry registry)` Add view controllers to create a direct mapping between a URL path and view name without the need for a controller in between.
`void` | `configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer)` Configure a handler to delegate unhandled requests by forwarding to the Servlet container's "default" servlet.
`void` | `configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers)` Configure the `HandlerExceptionResolver`s to handle unresolved controller exceptions.
`void` | `configureMessageConverters(List<HttpMessageConverter<?>> converters)` Configure the `HttpMessageConverter`s to use in argument resolvers and return value handlers that support reading and/or writing to the body of the request and response.
`Validator` | `getValidator()` Provide a custom `Validator` instead of the one created by default.

Method Detail

### addFormatters

    void addFormatters(FormatterRegistry registry)

  Add `Converter`s and `Formatter`s in addition to the ones registered by default.

### configureMessageConverters

    void configureMessageConverters(List<HttpMessageConverter<?>> converters)

  Configure the `HttpMessageConverter`s to use in argument resolvers and return value handlers that support reading and/or writing to the body of the request and response. If no message converters are added to the list, default converters are added instead.

  Parameters:
    `converters` - initially an empty list of converters

### getValidator

    Validator getValidator()

  Provide a custom `Validator` instead of the one created by default. The default implementation, assuming JSR-303 is on the classpath, is: `LocalValidatorFactoryBean`. Leave the return value as `null` to keep the default.

### addArgumentResolvers

    void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers)

  Add resolvers to support custom controller method argument types.

  This does not override the built-in support for resolving handler method arguments. To customize the built-in support for argument resolution, configure `RequestMappingHandlerAdapter` directly.

  Parameters:
    `argumentResolvers` - initially an empty list

### addReturnValueHandlers

    void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers)

  Add handlers to support custom controller method return value types.

  Using this option does not override the built-in support for handling return values. To customize the built-in support for handling return values, configure RequestMappingHandlerAdapter directly.

  Parameters:
    `returnValueHandlers` - initially an empty list

### configureHandlerExceptionResolvers

    void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers)

  Configure the `HandlerExceptionResolver`s to handle unresolved controller exceptions. If no resolvers are added to the list, default exception resolvers are added instead.

  Parameters:
    `exceptionResolvers` - initially an empty list

### addInterceptors

    void addInterceptors(InterceptorRegistry registry)

  Add Spring MVC lifecycle interceptors for pre- and post-processing of controller method invocations. Interceptors can be registered to apply to all requests or be limited to a subset of URL patterns.

### addViewControllers

    void addViewControllers(ViewControllerRegistry registry)

  Add view controllers to create a direct mapping between a URL path and view name without the need for a controller in between.

### addResourceHandlers

    void addResourceHandlers(ResourceHandlerRegistry registry)

  Add handlers to serve static resources such as images, js, and, css files from specific locations under web application root, the classpath, and others.

### configureDefaultServletHandling

    void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer)

  Configure a handler to delegate unhandled requests by forwarding to the Servlet container's "default" servlet. A common use case for this is when the `DispatcherServlet` is mapped to "/" thus overriding the Servlet container's default handling of static resources.

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