Java Spring 3 - 为 NoSuchRequestHandlingMethodException 创建 ExceptionHandler
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Spring 3 - Create ExceptionHandler for NoSuchRequestHandlingMethodException
提问by sgsweb
Using Spring 3, I like to create an exception handler using the ExceptionHandlerannotation that will handle "no page found (404)"requests. I am using the following code to do this. But when I point to a URL that does not exist, the default exception handler defined by Spring is being invoked.
使用 Spring 3，我喜欢使用ExceptionHandler注释创建一个异常处理程序，该注释将处理“未找到页面（404）”请求。我正在使用以下代码来执行此操作。但是当我指向一个不存在的 URL 时，就会调用 Spring 定义的默认异常处理程序。
It might be that I'm handling the NoSuchRequestHandlingMethodExceptionexception. If it is, then what exception should I be registering?
可能是我正在处理NoSuchRequestHandlingMethodException异常。如果是，那么我应该注册什么例外？
Will you please take a look at the following code and see what I'm doing wrong?
请你看看下面的代码，看看我做错了什么？
NOTE: If I change the exception in the @ExceptionHandlerto NullPointerExceptionand create a RequestMappingto throw null pointer, that will work.
注意：如果我将@ExceptionHandler 中的异常更改为NullPointerException并创建一个RequestMapping以抛出空指针，那将起作用。
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.mvc.multiaction.NoSuchRequestHandlingMethodException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class GeneralHandler {
private final Log logger = LogFactory.getLog(getClass());
@ExceptionHandler(NoSuchRequestHandlingMethodException.class)
public ModelAndView handleException (NoSuchRequestHandlingMethodException ex) {
ModelAndView mav = new ModelAndView();
logger.error("Exception found: " + ex);
return mav;
}
}
采纳答案by skaffman
@ExceptionHandler-annotated methods are invoked when a @RequestMappingmethod on that same class throws an exception. So when you added the mapping which threw the NullPointerException, that worked, since the mapped method and exception handler were together in the same class.
@ExceptionHandler-annotated 方法@RequestMapping在同一个类上的方法抛出异常时被调用。因此，当您添加抛出 的映射时NullPointerException，它起作用了，因为映射的方法和异常处理程序在同一个类中。
When no mapping is found, Spring has no way of associating the NoSuchRequestHandlingMethodExceptionwith your @ExceptionHandler, because it didn't get as far as matching the request to a handler method. This isn't mentioned explicitly in the docs, but is the behaviour I've observed.
当未找到映射时，Spring 无法将NoSuchRequestHandlingMethodException与您的 相关联@ExceptionHandler，因为它没有将请求与处理程序方法相匹配。这在文档中没有明确提到，而是我观察到的行为。
If you want to handle this exception specially, you're going to have to use the more general HandlerExceptionResolverapproach, rather than the more specialised @ExceptionHandlertechnique.
如果你想特别处理这个异常，你将不得不使用更通用的HandlerExceptionResolver方法，而不是更专业的@ExceptionHandler技术。
回答by lisak
回答by Janning
In Spring 3.2 you can use @ContollerAdviceto have an ExceptionHandler for all your Controllers like this:
在 Spring 3.2 中，您可以使用@ContollerAdvice为所有控制器设置一个 ExceptionHandler，如下所示：
@ControllerAdvice
public class GeneralHandler {
@ExceptionHandler
public ModelAndView handleException (NoSuchRequestHandlingMethodException ex) {
ModelAndView mav = new ModelAndView();
...
return mav;
}
}
You can even add more annotations to return serialized json
您甚至可以添加更多注释以返回序列化的 json
@ExceptionHandler
@ResponseBody
@ResponseStatus(HttpStatus.BAD_REQUEST)
public RestError resolveBindingException ( MethodArgumentNotValidException methodArgumentNotValidException, Locale locale )
{
BindingResult bindingResult = methodArgumentNotValidException.getBindingResult();
return getRestError(bindingResult, locale);
}
