org.springframework.core.MethodParameter#getParameterAnnotations ( )源码实例Demo

@Override
public List<Constraint> resolveForParameter(MethodParameter param) {
    if (CONSTRAINT_CLASS == null) {
        return Collections.emptyList();
    }

    List<Constraint> constraints = new ArrayList<>();
    for (Annotation annot : param.getParameterAnnotations()) {
        Class<? extends Annotation> type = annot.annotationType();
        if (type.getAnnotation(CONSTRAINT_CLASS) != null) {
            Constraint constraint = createConstraint(annot, type);
            constraints.add(constraint);
        }
    }
    return constraints;
}
 

/**
 * Validate the specified candidate value if applicable.
 * <p>The default implementation checks for {@code @javax.validation.Valid},
 * Spring's {@link org.springframework.validation.annotation.Validated},
 * and custom annotations whose name starts with "Valid".
 * @param binder the DataBinder to be used
 * @param parameter the method parameter declaration
 * @param targetType the target type
 * @param fieldName the name of the field
 * @param value the candidate value
 * @since 5.1
 * @see #validateIfApplicable(WebDataBinder, MethodParameter)
 * @see SmartValidator#validateValue(Class, String, Object, Errors, Object...)
 */
protected void validateValueIfApplicable(WebDataBinder binder, MethodParameter parameter,
		Class<?> targetType, String fieldName, @Nullable Object value) {

	for (Annotation ann : parameter.getParameterAnnotations()) {
		Object[] validationHints = determineValidationHints(ann);
		if (validationHints != null) {
			for (Validator validator : binder.getValidators()) {
				if (validator instanceof SmartValidator) {
					try {
						((SmartValidator) validator).validateValue(targetType, fieldName, value,
								binder.getBindingResult(), validationHints);
					}
					catch (IllegalArgumentException ex) {
						// No corresponding field on the target class...
					}
				}
			}
			break;
		}
	}
}
 

/**
 * Validate the payload if applicable.
 * <p>The default implementation checks for {@code @javax.validation.Valid},
 * Spring's {@link org.springframework.validation.annotation.Validated},
 * and custom annotations whose name starts with "Valid".
 * @param message the currently processed message
 * @param parameter the method parameter
 * @param target the target payload object
 * @throws MethodArgumentNotValidException in case of binding errors
 */
protected void validate(Message<?> message, MethodParameter parameter, Object target) {
	if (this.validator == null) {
		return;
	}
	for (Annotation ann : parameter.getParameterAnnotations()) {
		Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
		if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
			Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
			Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
			BeanPropertyBindingResult bindingResult =
					new BeanPropertyBindingResult(target, getParameterName(parameter));
			if (!ObjectUtils.isEmpty(validationHints) && this.validator instanceof SmartValidator) {
				((SmartValidator) this.validator).validate(target, bindingResult, validationHints);
			}
			else {
				this.validator.validate(target, bindingResult);
			}
			if (bindingResult.hasErrors()) {
				throw new MethodArgumentNotValidException(message, parameter, bindingResult);
			}
			break;
		}
	}
}
 

/**
 * Validate the specified candidate value if applicable.
 * <p>The default implementation checks for {@code @javax.validation.Valid},
 * Spring's {@link org.springframework.validation.annotation.Validated},
 * and custom annotations whose name starts with "Valid".
 * @param binder the DataBinder to be used
 * @param parameter the method parameter declaration
 * @param targetType the target type
 * @param fieldName the name of the field
 * @param value the candidate value
 * @since 5.1
 * @see #validateIfApplicable(WebDataBinder, MethodParameter)
 * @see SmartValidator#validateValue(Class, String, Object, Errors, Object...)
 */
protected void validateValueIfApplicable(WebDataBinder binder, MethodParameter parameter,
		Class<?> targetType, String fieldName, @Nullable Object value) {

	for (Annotation ann : parameter.getParameterAnnotations()) {
		Object[] validationHints = determineValidationHints(ann);
		if (validationHints != null) {
			for (Validator validator : binder.getValidators()) {
				if (validator instanceof SmartValidator) {
					try {
						((SmartValidator) validator).validateValue(targetType, fieldName, value,
								binder.getBindingResult(), validationHints);
					}
					catch (IllegalArgumentException ex) {
						// No corresponding field on the target class...
					}
				}
			}
			break;
		}
	}
}
 

@Nullable
private Consumer<Object> getValidator(Message<?> message, MethodParameter parameter) {
	if (this.validator == null) {
		return null;
	}
	for (Annotation ann : parameter.getParameterAnnotations()) {
		Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
		if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
			Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
			Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
			String name = Conventions.getVariableNameForParameter(parameter);
			return target -> {
				BeanPropertyBindingResult bindingResult = new BeanPropertyBindingResult(target, name);
				if (!ObjectUtils.isEmpty(validationHints) && this.validator instanceof SmartValidator) {
					((SmartValidator) this.validator).validate(target, bindingResult, validationHints);
				}
				else {
					this.validator.validate(target, bindingResult);
				}
				if (bindingResult.hasErrors()) {
					throw new MethodArgumentNotValidException(message, parameter, bindingResult);
				}
			};
		}
	}
	return null;
}
 

private void validateIfApplicable(WebExchangeDataBinder binder, MethodParameter parameter) {
	for (Annotation ann : parameter.getParameterAnnotations()) {
		Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
		if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
			Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
			if (hints != null) {
				Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
				binder.validate(validationHints);
			}
			else {
				binder.validate();
			}
		}
	}
}
 

@Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
    HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
    String authorization = request.getHeader("Authorization");
    String result = null;
    JwtClaim token = null;
    if(authorization!=null){
        Annotation[] methodAnnotations = parameter.getParameterAnnotations();
        for (Annotation methodAnnotation : methodAnnotations) {
            if(methodAnnotation instanceof JwtClaim){
                token = (JwtClaim) methodAnnotation;
                break;
            }
        }
        if(token!=null){
            result = JwtUtil.get(authorization,token.value());
        }
    }
    if(result!=null){
        return result;
    }
    if(token==null || token.exception()){
        throw new RequestException(ResponseCode.NOT_SING_IN);
    }else{
        return null;
    }
}
 

/**
 * Create a new type descriptor from a {@link MethodParameter}.
 * <p>Use this constructor when a source or target conversion point is a
 * constructor parameter, method parameter, or method return value.
 * @param methodParameter the method parameter
 */
public TypeDescriptor(MethodParameter methodParameter) {
	this.resolvableType = ResolvableType.forMethodParameter(methodParameter);
	this.type = this.resolvableType.resolve(methodParameter.getNestedParameterType());
	this.annotatedElement = new AnnotatedElementAdapter(methodParameter.getParameterIndex() == -1 ?
			methodParameter.getMethodAnnotations() : methodParameter.getParameterAnnotations());
}
 

/**
 * Create a new type descriptor from a {@link MethodParameter}.
 * <p>Use this constructor when a source or target conversion point is a
 * constructor parameter, method parameter, or method return value.
 * @param methodParameter the method parameter
 */
public TypeDescriptor(MethodParameter methodParameter) {
	this.resolvableType = ResolvableType.forMethodParameter(methodParameter);
	this.type = this.resolvableType.resolve(methodParameter.getParameterType());
	this.annotatedElement = new AnnotatedElementAdapter(methodParameter.getParameterIndex() == -1 ?
			methodParameter.getMethodAnnotations() : methodParameter.getParameterAnnotations());
}
 

private boolean validateParameter(MethodParameter parameter) {
    Annotation[] annotations = parameter.getParameterAnnotations();
    for (Annotation annot : annotations) {
        if (annot.annotationType().getSimpleName().startsWith("Valid")) {
            return true;
        }
    }

    return false;
}
 

private void validateIfApplicable(WebExchangeDataBinder binder, MethodParameter parameter) {
	for (Annotation ann : parameter.getParameterAnnotations()) {
		Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
		if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
			Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
			if (hints != null) {
				Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
				binder.validate(validationHints);
			}
			else {
				binder.validate();
			}
		}
	}
}
 

private boolean isAnnotated(MethodParameter methodParameter) {
	for (Annotation annotation : methodParameter.getParameterAnnotations()) {
		for (Class<? extends Annotation> annotationType : resolversBySupportedType.keySet()) {
			if (annotationType.equals(annotation.annotationType())) {
				return true;
			}
		}
	}

	return isAnnotatedRecursively(methodParameter.getParameterType());
}
 

/**
 * Validate the model attribute if applicable.
 * <p>The default implementation checks for {@code @javax.validation.Valid},
 * Spring's {@link org.springframework.validation.annotation.Validated},
 * and custom annotations whose name starts with "Valid".
 * @param binder the DataBinder to be used
 * @param methodParam the method parameter
 */
protected void validateIfApplicable(WebDataBinder binder, MethodParameter methodParam) {
	Annotation[] annotations = methodParam.getParameterAnnotations();
	for (Annotation ann : annotations) {
		Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
		if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
			Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
			Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
			binder.validate(validationHints);
			break;
		}
	}
}
 

private boolean hasSpringAnnotation(MethodParameter parameter){
    for(Annotation ann:parameter.getParameterAnnotations()){
        if(ann.annotationType().getPackage().getName().startsWith("org.springframework.web.bind.annotation")){
            return true;
        }
    }
    return false;
}
 

/**
 * Validate the request part if applicable.
 * <p>The default implementation checks for {@code @javax.validation.Valid},
 * Spring's {@link org.springframework.validation.annotation.Validated},
 * and custom annotations whose name starts with "Valid".
 * @param binder the DataBinder to be used
 * @param methodParam the method parameter
 * @see #isBindExceptionRequired
 * @since 4.1.5
 */
protected void validateIfApplicable(WebDataBinder binder, MethodParameter methodParam) {
	Annotation[] annotations = methodParam.getParameterAnnotations();
	for (Annotation ann : annotations) {
		Validated validatedAnn = AnnotationUtils.getAnnotation(ann, Validated.class);
		if (validatedAnn != null || ann.annotationType().getSimpleName().startsWith("Valid")) {
			Object hints = (validatedAnn != null ? validatedAnn.value() : AnnotationUtils.getValue(ann));
			Object[] validationHints = (hints instanceof Object[] ? (Object[]) hints : new Object[] {hints});
			binder.validate(validationHints);
			break;
		}
	}
}
 

private boolean validateParameter(MethodParameter parameter) {
    Annotation[] annotations = parameter.getParameterAnnotations();
    for (Annotation annot : annotations) {
        if (annot.annotationType().getSimpleName().startsWith("Valid")) {
            return true;
        }
    }

    return false;
}
 

/**
 * Validate the model attribute if applicable.
 * <p>The default implementation checks for {@code @javax.validation.Valid}.
 *
 * @param binder    the DataBinder to be used
 * @param parameter the method parameter
 */
protected void validateIfApplicable(WebDataBinder binder, MethodParameter parameter) {
    Annotation[] annotations = parameter.getParameterAnnotations();
    for (Annotation annot : annotations) {
        if (annot.annotationType().getSimpleName().startsWith("Valid")) {
            Object hints = AnnotationUtils.getValue(annot);
            binder.validate(hints instanceof Object[] ? (Object[]) hints : new Object[]{hints});
        }
    }
}
 

@Override
public boolean supportsParameter(MethodParameter parameter) {
	return Map.class.isAssignableFrom(parameter.getParameterType()) &&
			parameter.getParameterAnnotations().length == 0;
}
 

private Object[] resolveInitBinderArguments(Object handler, Method initBinderMethod,
		WebDataBinder binder, NativeWebRequest webRequest) throws Exception {

	Class<?>[] initBinderParams = initBinderMethod.getParameterTypes();
	Object[] initBinderArgs = new Object[initBinderParams.length];

	for (int i = 0; i < initBinderArgs.length; i++) {
		MethodParameter methodParam = new SynthesizingMethodParameter(initBinderMethod, i);
		methodParam.initParameterNameDiscovery(this.parameterNameDiscoverer);
		GenericTypeResolver.resolveParameterType(methodParam, handler.getClass());
		String paramName = null;
		boolean paramRequired = false;
		String paramDefaultValue = null;
		String pathVarName = null;
		Annotation[] paramAnns = methodParam.getParameterAnnotations();

		for (Annotation paramAnn : paramAnns) {
			if (RequestParam.class.isInstance(paramAnn)) {
				RequestParam requestParam = (RequestParam) paramAnn;
				paramName = requestParam.name();
				paramRequired = requestParam.required();
				paramDefaultValue = parseDefaultValueAttribute(requestParam.defaultValue());
				break;
			}
			else if (ModelAttribute.class.isInstance(paramAnn)) {
				throw new IllegalStateException(
						"@ModelAttribute is not supported on @InitBinder methods: " + initBinderMethod);
			}
			else if (PathVariable.class.isInstance(paramAnn)) {
				PathVariable pathVar = (PathVariable) paramAnn;
				pathVarName = pathVar.value();
			}
		}

		if (paramName == null && pathVarName == null) {
			Object argValue = resolveCommonArgument(methodParam, webRequest);
			if (argValue != WebArgumentResolver.UNRESOLVED) {
				initBinderArgs[i] = argValue;
			}
			else {
				Class<?> paramType = initBinderParams[i];
				if (paramType.isInstance(binder)) {
					initBinderArgs[i] = binder;
				}
				else if (BeanUtils.isSimpleProperty(paramType)) {
					paramName = "";
				}
				else {
					throw new IllegalStateException("Unsupported argument [" + paramType.getName() +
							"] for @InitBinder method: " + initBinderMethod);
				}
			}
		}

		if (paramName != null) {
			initBinderArgs[i] =
					resolveRequestParam(paramName, paramRequired, paramDefaultValue, methodParam, webRequest, null);
		}
		else if (pathVarName != null) {
			initBinderArgs[i] = resolvePathVariable(pathVarName, methodParam, webRequest, null);
		}
	}

	return initBinderArgs;
}
 

/**
 * Validate the model attribute if applicable.
 * <p>The default implementation checks for {@code @javax.validation.Valid},
 * Spring's {@link org.springframework.validation.annotation.Validated},
 * and custom annotations whose name starts with "Valid".
 * @param binder the DataBinder to be used
 * @param parameter the method parameter declaration
 * @see WebDataBinder#validate(Object...)
 * @see SmartValidator#validate(Object, Errors, Object...)
 */
protected void validateIfApplicable(WebDataBinder binder, MethodParameter parameter) {
	for (Annotation ann : parameter.getParameterAnnotations()) {
		Object[] validationHints = determineValidationHints(ann);
		if (validationHints != null) {
			binder.validate(validationHints);
			break;
		}
	}
}