## org.springframework.web.servlet.mvc.annotation
Class AnnotationMethodHandlerAdapter

    java.lang.Object
      org.springframework.context.support.ApplicationObjectSupport
          org.springframework.web.context.support.WebApplicationObjectSupport
              org.springframework.web.servlet.support.WebContentGenerator
                  org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter

All Implemented Interfaces:
  ApplicationContextAware, ServletContextAware, HandlerAdapter

    public class AnnotationMethodHandlerAdapter

extends WebContentGenerator
implements HandlerAdapter

Implementation of the `HandlerAdapter` interface that maps handler methods based on HTTP paths, HTTP methods and request parameters expressed through the `RequestMapping` annotation.

Supports request parameter binding through the `RequestParam` annotation. Also supports the `ModelAttribute` annotation for exposing model attribute values to the view, as well as `InitBinder` for binder initialization methods and `SessionAttributes` for automatic session management of specific attributes.

This adapter can be customized through various bean properties. A common use case is to apply shared binder initialization logic through a custom `WebBindingInitializer`.

Since:
  2.5
Author:
  Juergen Hoeller, Arjen Poutsma
See Also:
  `setPathMatcher(org.springframework.util.PathMatcher)`, `setMethodNameResolver(org.springframework.web.servlet.mvc.multiaction.MethodNameResolver)`, `setWebBindingInitializer(org.springframework.web.bind.support.WebBindingInitializer)`, `setSessionAttributeStore(org.springframework.web.bind.support.SessionAttributeStore)`

Field Summary
`static String` `PAGE_NOT_FOUND_LOG_CATEGORY` Log category to use when no mapped handler is found for a request.
`protected static Log` `pageNotFoundLogger` Additional logger to use when no mapped handler is found for a request.

Fields inherited from class org.springframework.web.servlet.support.WebContentGenerator
`METHOD_GET, METHOD_HEAD, METHOD_POST`

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport
`logger`

Constructor Summary
`AnnotationMethodHandlerAdapter()`

Method Summary
`protected ServletRequestDataBinder` `createBinder(HttpServletRequest request, Object target, String objectName)` Template method for creating a new ServletRequestDataBinder instance.
`long` `getLastModified(HttpServletRequest request, Object handler)` Same contract as for HttpServlet's `getLastModified` method.
`ModelAndView` `handle(HttpServletRequest request, HttpServletResponse response, Object handler)` Use the given handler to handle this request.
`protected ModelAndView` `handleNoSuchRequestHandlingMethod(NoSuchRequestHandlingMethodException ex, HttpServletRequest request, HttpServletResponse response)` Handle the case where no request handler method was found.
`protected ModelAndView` `invokeHandlerMethod(HttpServletRequest request, HttpServletResponse response, Object handler)`
`void` `setAlwaysUseFullPath(boolean alwaysUseFullPath)` Set if URL lookup should always use the full path within the current servlet context.
`void` `setCacheSecondsForSessionAttributeHandlers(int cacheSecondsForSessionAttributeHandlers)` Cache content produced by `@SessionAttributes` annotated handlers for the given number of seconds.
`void` `setCustomArgumentResolver(WebArgumentResolver argumentResolver)` Set a custom ArgumentResolvers to use for special method parameter types.
`void` `setCustomArgumentResolvers(WebArgumentResolver[] argumentResolvers)` Set one or more custom ArgumentResolvers to use for special method parameter types.
`void` `setMethodNameResolver(MethodNameResolver methodNameResolver)` Set the MethodNameResolver to use for resolving default handler methods (carrying an empty `@RequestMapping` annotation).
`void` `setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer)` Set the ParameterNameDiscoverer to use for resolving method parameter names if needed (e.g. for default attribute names).
`void` `setPathMatcher(PathMatcher pathMatcher)` Set the PathMatcher implementation to use for matching URL paths against registered URL patterns.
`void` `setSessionAttributeStore(SessionAttributeStore sessionAttributeStore)` Specify the strategy to store session attributes with.
`void` `setSynchronizeOnSession(boolean synchronizeOnSession)` Set if controller execution should be synchronized on the session, to serialize parallel invocations from the same client.
`void` `setUrlDecode(boolean urlDecode)` Set if context path and request URI should be URL-decoded.
`void` `setUrlPathHelper(UrlPathHelper urlPathHelper)` Set the UrlPathHelper to use for resolution of lookup paths.
`void` `setWebBindingInitializer(WebBindingInitializer webBindingInitializer)` Specify a WebBindingInitializer which will apply pre-configured configuration to every DataBinder that this controller uses.
`boolean` `supports(Object handler)` Given a handler instance, return whether or not this HandlerAdapter can support it.

Methods inherited from class org.springframework.web.servlet.support.WebContentGenerator
`applyCacheSeconds, applyCacheSeconds, cacheForSeconds, cacheForSeconds, checkAndPrepare, checkAndPrepare, getCacheSeconds, getSupportedMethods, isRequireSession, isUseCacheControlHeader, isUseCacheControlNoStore, isUseExpiresHeader, preventCaching, setCacheSeconds, setRequireSession, setSupportedMethods, setUseCacheControlHeader, setUseCacheControlNoStore, setUseExpiresHeader`

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport
`getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext`

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport
`getApplicationContext, getMessageSourceAccessor, initApplicationContext, requiredContextClass, setApplicationContext`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### PAGE_NOT_FOUND_LOG_CATEGORY

    public static final String PAGE_NOT_FOUND_LOG_CATEGORY

  Log category to use when no mapped handler is found for a request.

  See Also:
    `pageNotFoundLogger`, Constant Field Values

### pageNotFoundLogger

    protected static final Log pageNotFoundLogger

  Additional logger to use when no mapped handler is found for a request.

  See Also:
    `PAGE_NOT_FOUND_LOG_CATEGORY`

Constructor Detail

### AnnotationMethodHandlerAdapter

    public AnnotationMethodHandlerAdapter()

Method Detail

### setAlwaysUseFullPath

    public void setAlwaysUseFullPath(boolean alwaysUseFullPath)

  Set if URL lookup should always use the full path within the current servlet context. Else, the path within the current servlet mapping is used if applicable (that is, in the case of a ".../*" servlet mapping in web.xml).

  Default is "false".

  See Also:
    `UrlPathHelper.setAlwaysUseFullPath(boolean)`

### setUrlDecode

    public void setUrlDecode(boolean urlDecode)

  Set if context path and request URI should be URL-decoded. Both are returned undecoded by the Servlet API, in contrast to the servlet path.

  Uses either the request encoding or the default encoding according to the Servlet spec (ISO-8859-1).

  See Also:
    `UrlPathHelper.setUrlDecode(boolean)`

### setUrlPathHelper

    public void setUrlPathHelper(UrlPathHelper urlPathHelper)

  Set the UrlPathHelper to use for resolution of lookup paths.

  Use this to override the default UrlPathHelper with a custom subclass, or to share common UrlPathHelper settings across multiple HandlerMappings and HandlerAdapters.

### setPathMatcher

    public void setPathMatcher(PathMatcher pathMatcher)

  Set the PathMatcher implementation to use for matching URL paths against registered URL patterns. Default is AntPathMatcher.

  See Also:
    `AntPathMatcher`

### setMethodNameResolver

    public void setMethodNameResolver(MethodNameResolver methodNameResolver)

  Set the MethodNameResolver to use for resolving default handler methods (carrying an empty `@RequestMapping` annotation).

  Will only kick in when the handler method cannot be resolved uniquely through the annotation metadata already.

### setWebBindingInitializer

    public void setWebBindingInitializer(WebBindingInitializer webBindingInitializer)

  Specify a WebBindingInitializer which will apply pre-configured configuration to every DataBinder that this controller uses.

### setSessionAttributeStore

    public void setSessionAttributeStore(SessionAttributeStore sessionAttributeStore)

  Specify the strategy to store session attributes with.

  Default is `DefaultSessionAttributeStore`, storing session attributes in the HttpSession, using the same attribute name as in the model.

### setCacheSecondsForSessionAttributeHandlers

    public void setCacheSecondsForSessionAttributeHandlers(int cacheSecondsForSessionAttributeHandlers)

  Cache content produced by `@SessionAttributes` annotated handlers for the given number of seconds. Default is 0, preventing caching completely.

  In contrast to the "cacheSeconds" property which will apply to all general handlers (but not to `@SessionAttributes` annotated handlers), this setting will apply to `@SessionAttributes` annotated handlers only.

  See Also:
    `WebContentGenerator.setCacheSeconds(int)`, `SessionAttributes`

### setSynchronizeOnSession

    public void setSynchronizeOnSession(boolean synchronizeOnSession)

  Set if controller execution should be synchronized on the session, to serialize parallel invocations from the same client.

  More specifically, the execution of each handler method will get synchronized if this flag is "true". The best available session mutex will be used for the synchronization; ideally, this will be a mutex exposed by HttpSessionMutexListener.

  The session mutex is guaranteed to be the same object during the entire lifetime of the session, available under the key defined by the `SESSION_MUTEX_ATTRIBUTE` constant. It serves as a safe reference to synchronize on for locking on the current session.

  In many cases, the HttpSession reference itself is a safe mutex as well, since it will always be the same object reference for the same active logical session. However, this is not guaranteed across different servlet containers; the only 100% safe way is a session mutex.

  See Also:
    `HttpSessionMutexListener`, `WebUtils.getSessionMutex(javax.servlet.http.HttpSession)`

### setParameterNameDiscoverer

    public void setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer)

  Set the ParameterNameDiscoverer to use for resolving method parameter names if needed (e.g. for default attribute names).

  Default is a `LocalVariableTableParameterNameDiscoverer`.

### setCustomArgumentResolver

    public void setCustomArgumentResolver(WebArgumentResolver argumentResolver)

  Set a custom ArgumentResolvers to use for special method parameter types. Such a custom ArgumentResolver will kick in first, having a chance to resolve an argument value before the standard argument handling kicks in.

### setCustomArgumentResolvers

    public void setCustomArgumentResolvers(WebArgumentResolver[] argumentResolvers)

  Set one or more custom ArgumentResolvers to use for special method parameter types. Any such custom ArgumentResolver will kick in first, having a chance to resolve an argument value before the standard argument handling kicks in.

### supports

    public boolean supports(Object handler)

  Description copied from interface: `HandlerAdapter`
  Given a handler instance, return whether or not this HandlerAdapter can support it. Typical HandlerAdapters will base the decision on the handler type. HandlerAdapters will usually only support one handler type each.

  A typical implementation:

  `return (handler instanceof MyHandler);`

  Specified by:
    `supports` in interface `HandlerAdapter`
  Parameters:
    `handler` - handler object to check
  Returns:
    whether or not this object can use the given handler

### handle

    public ModelAndView handle(HttpServletRequest request,
                               HttpServletResponse response,
                               Object handler)
                        throws Exception

  Description copied from interface: `HandlerAdapter`
  Use the given handler to handle this request. The workflow that is required may vary widely.

  Specified by:
    `handle` in interface `HandlerAdapter`
  Parameters:
    `request` - current HTTP request
    `response` - current HTTP response
    `handler` - handler to use. This object must have previously been passed to the `supports` method of this interface, which must have returned `true`.
  Returns:
    ModelAndView object with the name of the view and the required model data, or `null` if the request has been handled directly
  Throws:
    `Exception` - in case of errors

### invokeHandlerMethod

    protected ModelAndView invokeHandlerMethod(HttpServletRequest request,
                                               HttpServletResponse response,
                                               Object handler)
                                        throws Exception

  Throws:
    `Exception`

### getLastModified

    public long getLastModified(HttpServletRequest request,
                                Object handler)

  Description copied from interface: `HandlerAdapter`
  Same contract as for HttpServlet's `getLastModified` method. Can simply return -1 if there's no support in the handler class.

  Specified by:
    `getLastModified` in interface `HandlerAdapter`
  Parameters:
    `request` - current HTTP request
    `handler` - handler to use
  Returns:
    the lastModified value for the given handler
  See Also:
    `HttpServlet.getLastModified(javax.servlet.http.HttpServletRequest)`, `LastModified.getLastModified(javax.servlet.http.HttpServletRequest)`

### handleNoSuchRequestHandlingMethod

    protected ModelAndView handleNoSuchRequestHandlingMethod(NoSuchRequestHandlingMethodException ex,
                                                             HttpServletRequest request,
                                                             HttpServletResponse response)
                                                      throws Exception

  Handle the case where no request handler method was found.

  The default implementation logs a warning and sends an HTTP 404 error. Alternatively, a fallback view could be chosen, or the NoSuchRequestHandlingMethodException could be rethrown as-is.

  Parameters:
    `ex` - the NoSuchRequestHandlingMethodException to be handled
    `request` - current HTTP request
    `response` - current HTTP response
  Returns:
    a ModelAndView to render, or `null` if handled directly
  Throws:
    `Exception` - an Exception that should be thrown as result of the servlet request

### createBinder

    protected ServletRequestDataBinder createBinder(HttpServletRequest request,
                                                    Object target,
                                                    String objectName)
                                             throws Exception

  Template method for creating a new ServletRequestDataBinder instance.

  The default implementation creates a standard ServletRequestDataBinder. This can be overridden for custom ServletRequestDataBinder subclasses.

  Parameters:
    `request` - current HTTP request
    `target` - the target object to bind onto (or `null` if the binder is just used to convert a plain parameter value)
    `objectName` - the objectName of the target object
  Returns:
    the ServletRequestDataBinder instance to use
  Throws:
    `Exception` - in case of invalid state or arguments
  See Also:
    `ServletRequestDataBinder.bind(javax.servlet.ServletRequest)`, `DataBinder.convertIfNecessary(Object, Class, MethodParameter)`

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