```
@Target(METHOD)
@Retention(RUNTIME)
@Documented
public @interface ExceptionHandler
```
Annotation for handling exceptions in specific handler classes and/or handler methods.
Handler methods which are annotated with this annotation are allowed to have very flexible signatures. They may have parameters of the following types, in arbitrary order:
- An exception argument: declared as a general Exception or as a more specific exception. This also serves as a mapping hint if the annotation itself does not narrow the exception types through its value().
- Request and/or response objects (typically from the Servlet API). You may choose any specific request/response type, e.g. ServletRequest / HttpServletRequest.
- Session object: typically HttpSession. An argument of this type will enforce the presence of a corresponding session. As a consequence, such an argument will never be null. Note that session access may not be thread-safe, in particular in a Servlet environment: Consider switching the "synchronizeOnSession" flag to "true" if multiple requests are allowed to access a session concurrently.
- WebRequest or NativeWebRequest. Allows for generic request parameter access as well as request/session attribute access, without ties to the native Servlet API.
- Locale for the current request locale (determined by the most specific locale resolver available, i.e. the configured LocaleResolver in a Servlet environment).
- InputStream / Reader for access to the request's content. This will be the raw InputStream/Reader as exposed by the Servlet API.
- OutputStream / Writer for generating the response's content. This will be the raw OutputStream/Writer as exposed by the Servlet API.
- Model as an alternative to returning a model map from the handler method. Note that the provided model is not pre-populated with regular model attributes and therefore always empty, as a convenience for preparing the model for an exception-specific view.
The following return types are supported for handler methods:
- A ModelAndView object (from Servlet MVC).
- A Model object, with the view name implicitly determined through a RequestToViewNameTranslator.
- A Map object for exposing a model, with the view name implicitly determined through a RequestToViewNameTranslator.
- A View object.
- A String value which is interpreted as view name.
- @ResponseBody annotated methods (Servlet-only) to set the response content. The return value will be converted to the response stream using message converters.
- An HttpEntity<?> or ResponseEntity<?> object (Servlet-only) to set response headers and content. The ResponseEntity body will be converted and written to the response stream using message converters.
- void if the method handles the response itself (by writing the response content directly, declaring an argument of type ServletResponse / HttpServletResponse for that purpose) or if the view name is supposed to be implicitly determined through a RequestToViewNameTranslator (not declaring a response argument in the handler method signature).
You may combine the ExceptionHandler annotation with @ResponseStatus for a specific HTTP error status.
从以下版本开始:
3.0
作者:
Arjen Poutsma, Juergen Hoeller
另请参阅:
WebRequest

- 可选元素概要
  可选元素
  修饰符和类型可选元素说明
  Class<? extends Throwable>[] value
  Exceptions handled by the annotated method.

- 元素详细资料
  - value
```
Class<? extends Throwable>[] value
```
    Exceptions handled by the annotated method. If empty, will default to any exceptions listed in the method argument list.
    默认值:
    {}

注释类型 ExceptionHandler

可选元素概要

元素详细资料

value