java - Spring MVC中的异常处理——异常描述

Question

我有一个用 @ResponseStatus 注释的异常，如下所示:

@ResponseStatus(value = HttpStatus.UNPROCESSABLE_ENTITY, reason = "Restrioctions violated. Need confirmation.")
@ResponseBody
public class RestrictionExceptions extends Exception {

    private List<RestrictionViolation> restrictionViolations;

但是，当引发异常时，@ResponseStatus 声明中只有 HTTP 状态代码和 reason 。是否可以在错误响应正文中包含 restrictionViolations ？

我想将异常声明保留在异常本身中，如果可能的话，我不想在 Controller 中引入一些异常处理方法。

Answer 1

您可以使用您希望在正文中包含的字段创建一个 ErrorResource:

public class ErrorResource {
    private String reason;
    private String value;
    private List<RestrictionViolation> restrictionViolations;
    ....
}

并在处理程序中处理异常:

@ControllerAdvice
public class RestrictionExceptionsHandler {

@ExceptionHandler({ RestrictionExceptions.class })
protected ResponseEntity<ErrorResource> handleInvalidRequest(Exception exception) {
    RestrictionExceptions restrictionExceptions = (RestrictionExceptions) exception;

    ErrorResource error = new ErrorResource();
    Class clazz = exception.getClass();
    if(clazz.isAnnotationPresent(ResponseStatus.class)){
         ResponseStatus responseStatus = (ResponseStatus) clazz.getAnnotation(ResponseStatus.class);
        error.setValue(responseStatus.value());
        error.setReason(responseStatus.reason());
    }
    error.setRestrictionViolations(restrictionExceptions.getRestrictionViolations());

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);

    return new ResponseEntity<ErrorResource>(error, error.getValue());
}
}