[英]Exception Handling in Spring boot
I have a spring-boot application which has the following end point: 我有一个具有以下端点的spring-boot应用程序:
@RequestMapping("/my-end-point")
public MyCustomObject handleProduct(
@RequestParam(name = "productId") String productId,
@RequestParam(name = "maxVersions", defaultValue = "1") int maxVersions,
){
// my code
}
This should handle requests of the form 这应该处理以下形式的请求
/my-end-point?productId=xyz123&maxVersions=4
However, when I specify maxVersions=3.5
, this throws NumberFormatException
(for obvious reason). 但是,当我指定
maxVersions=3.5
,这将引发NumberFormatException
(出于明显的原因)。 How can I gracefully handle this NumberFormatException
and return an error message? 我如何优雅地处理此
NumberFormatException
并返回错误消息?
You can define an ExceptionHandler
in the same controller or in a ControllerAdvice
that handles the MethodArgumentTypeMismatchException
exception: 您可以在处理
MethodArgumentTypeMismatchException
异常的同一控制器或ControllerAdvice
中定义ExceptionHandler
:
@ExceptionHandler(MethodArgumentTypeMismatchException.class)
public void handleTypeMismatch(MethodArgumentTypeMismatchException ex) {
String name = ex.getName();
String type = ex.getRequiredType().getSimpleName();
Object value = ex.getValue();
String message = String.format("'%s' should be a valid '%s' and '%s' isn't",
name, type, value);
System.out.println(message);
// Do the graceful handling
}
If during controller method argument resolution, Spring detects a type mismatch between the method argument type and actual value type, it would raise an MethodArgumentTypeMismatchException
. 如果在控制器方法自变量解析期间,Spring检测到方法自变量类型与实际值类型之间的类型不匹配,则将引发
MethodArgumentTypeMismatchException
。 For more details on how to define an ExceptionHandler
, you can consult the documentation . 有关如何定义
ExceptionHandler
更多详细信息,请查阅文档 。
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