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

public static MethodParameter interfaceMethodParameter(MethodParameter parameter, Class annotationType) {
    if (!parameter.hasParameterAnnotation(annotationType)) {
        for (Class<?> itf : parameter.getDeclaringClass().getInterfaces()) {
            try {
                Method method = itf.getMethod(parameter.getMethod().getName(), parameter.getMethod().getParameterTypes());
                MethodParameter itfParameter = new MethodParameter(method, parameter.getParameterIndex());
                if (itfParameter.hasParameterAnnotation(annotationType)) {
                    return itfParameter;
                }
            } catch (NoSuchMethodException e) {
                continue;
            }
        }
    }
    return parameter;
}
 

/**
 * Determine a Jackson serialization view based on the given conversion hint.
 * @param conversionHint the conversion hint Object as passed into the
 * converter for the current conversion attempt
 * @return the serialization view class, or {@code null} if none
 * @since 4.2
 */
@Nullable
protected Class<?> getSerializationView(@Nullable Object conversionHint) {
	if (conversionHint instanceof MethodParameter) {
		MethodParameter param = (MethodParameter) conversionHint;
		JsonView annotation = (param.getParameterIndex() >= 0 ?
				param.getParameterAnnotation(JsonView.class) : param.getMethodAnnotation(JsonView.class));
		if (annotation != null) {
			return extractViewClass(annotation, conversionHint);
		}
	}
	else if (conversionHint instanceof JsonView) {
		return extractViewClass((JsonView) conversionHint, conversionHint);
	}
	else if (conversionHint instanceof Class) {
		return (Class<?>) conversionHint;
	}

	// No JSON view specified...
	return null;
}
 

private Object getObjectBody(WxApiMethodInfo wxApiMethodInfo, Object[] args) {
    MethodParameter methodParameter = wxApiMethodInfo.getMethodParameters().stream()
            .filter(p -> !BeanUtils.isSimpleValueType(p.getParameterType()) || p.hasParameterAnnotation(WxApiBody.class))
            .findFirst().orElse(null);
    if (methodParameter == null) {
        throw new WxAppException("没有可处理的参数");
    }
    // 不是简单类型
    if (!BeanUtils.isSimpleValueType(methodParameter.getParameterType())) {
        // 暂时只支持json
        return args[methodParameter.getParameterIndex()];
    }
    if (args[methodParameter.getParameterIndex()] != null) {
        return args[methodParameter.getParameterIndex()].toString();
    } else {
        return "";
    }
}
 

private Object getErrors(MethodParameter parameter, BindingContext context) {
	Assert.isTrue(parameter.getParameterIndex() > 0,
			"Errors argument must be declared immediately after a model attribute argument");

	int index = parameter.getParameterIndex() - 1;
	MethodParameter attributeParam = MethodParameter.forExecutable(parameter.getExecutable(), index);
	ReactiveAdapter adapter = getAdapterRegistry().getAdapter(attributeParam.getParameterType());

	Assert.state(adapter == null, "An @ModelAttribute and an Errors/BindingResult argument " +
			"cannot both be declared with an async type wrapper. " +
			"Either declare the @ModelAttribute without an async wrapper type or " +
			"handle a WebExchangeBindException error signal through the async type.");

	ModelAttribute ann = parameter.getParameterAnnotation(ModelAttribute.class);
	String name = (ann != null && StringUtils.hasText(ann.value()) ?
			ann.value() : Conventions.getVariableNameForParameter(attributeParam));
	Object errors = context.getModel().asMap().get(BindingResult.MODEL_KEY_PREFIX + name);

	Assert.state(errors != null, () -> "An Errors/BindingResult argument is expected " +
			"immediately after the @ModelAttribute argument to which it applies. " +
			"For @RequestBody and @RequestPart arguments, please declare them with a reactive " +
			"type wrapper and use its onError operators to handle WebExchangeBindException: " +
			parameter.getMethod());

	return errors;
}
 

public static MethodParameter interfaceMethodParameter(MethodParameter parameter, Class annotationType) {
    if (!parameter.hasParameterAnnotation(annotationType)) {
        for (Class<?> itf : parameter.getDeclaringClass().getInterfaces()) {
            try {
                Method method =
                    itf.getMethod(parameter.getMethod().getName(), parameter.getMethod().getParameterTypes());
                MethodParameter itfParameter = new InterfaceMethodParameter(method, parameter.getParameterIndex());
                if (itfParameter.hasParameterAnnotation(annotationType)) {
                    return itfParameter;
                }
            } catch (NoSuchMethodException e) {
                continue;
            }
        }
    }
    return parameter;
}
 

private Object getErrors(MethodParameter parameter, BindingContext context) {
	Assert.isTrue(parameter.getParameterIndex() > 0,
			"Errors argument must be declared immediately after a model attribute argument");

	int index = parameter.getParameterIndex() - 1;
	MethodParameter attributeParam = MethodParameter.forExecutable(parameter.getExecutable(), index);
	ReactiveAdapter adapter = getAdapterRegistry().getAdapter(attributeParam.getParameterType());

	Assert.state(adapter == null, "An @ModelAttribute and an Errors/BindingResult argument " +
			"cannot both be declared with an async type wrapper. " +
			"Either declare the @ModelAttribute without an async wrapper type or " +
			"handle a WebExchangeBindException error signal through the async type.");

	ModelAttribute ann = parameter.getParameterAnnotation(ModelAttribute.class);
	String name = (ann != null && StringUtils.hasText(ann.value()) ?
			ann.value() : Conventions.getVariableNameForParameter(attributeParam));
	Object errors = context.getModel().asMap().get(BindingResult.MODEL_KEY_PREFIX + name);

	Assert.state(errors != null, () -> "An Errors/BindingResult argument is expected " +
			"immediately after the @ModelAttribute argument to which it applies. " +
			"For @RequestBody and @RequestPart arguments, please declare them with a reactive " +
			"type wrapper and use its onError operators to handle WebExchangeBindException: " +
			parameter.getMethod());

	return errors;
}
 

/**
 * Whether to raise a fatal bind exception on validation errors.
 * @param parameter the method parameter declaration
 * @return {@code true} if the next method parameter is not of type {@link Errors}
 * @since 5.0
 */
protected boolean isBindExceptionRequired(MethodParameter parameter) {
	int i = parameter.getParameterIndex();
	Class<?>[] paramTypes = parameter.getExecutable().getParameterTypes();
	boolean hasBindingResult = (paramTypes.length > (i + 1) && Errors.class.isAssignableFrom(paramTypes[i + 1]));
	return !hasBindingResult;
}
 

/**
 * 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());
}
 

/**
 * 判断类对应方法的参数是否有requestbody注解
 * @param clazz
 * @param refParam
 * @return
 */
private boolean hasRequestBodyAnnotation(Class<?> clazz, MethodParameter refParam) {
    if (ClassUtils.hasMethod(clazz, refParam.getExecutable().getName(), refParam.getExecutable().getParameterTypes())) {
        Method tmpMethod = ClassUtils.getMethod(clazz, refParam.getExecutable().getName(), refParam.getExecutable().getParameterTypes());
        MethodParameter supperParam = new MethodParameter(tmpMethod, refParam.getParameterIndex());
        if (supperParam.hasParameterAnnotation(RequestBody.class)) {
            return true;
        }
    }
    return false;
}
 

/**
 * Whether to raise a fatal bind exception on validation errors.
 * @param binder the data binder used to perform data binding
 * @param methodParam the method argument
 * @return {@code true} if the next method argument is not of type {@link Errors}
 */
protected boolean isBindExceptionRequired(WebDataBinder binder, MethodParameter methodParam) {
	int i = methodParam.getParameterIndex();
	Class<?>[] paramTypes = methodParam.getMethod().getParameterTypes();
	boolean hasBindingResult = (paramTypes.length > (i + 1) && Errors.class.isAssignableFrom(paramTypes[i + 1]));
	return !hasBindingResult;
}
 

/**
 * Whether to raise a {@link BindException} on validation errors.
 *
 * @param parameter the method argument
 * @return {@code true} if the next method argument is not of type {@link org.springframework.validation.Errors}.
 */
protected boolean isBindExceptionRequired(MethodParameter parameter) {
    int i = parameter.getParameterIndex();
    Class<?>[] paramTypes = parameter.getMethod().getParameterTypes();
    boolean hasBindingResult = (paramTypes.length > (i + 1) && Errors.class.isAssignableFrom(paramTypes[i + 1]));

    return !hasBindingResult;
}
 

private String getParameterName(MethodParameter param) {
	String paramName = param.getParameterName();
	return (paramName != null ? paramName : "Arg " + param.getParameterIndex());
}
 

protected static String formatArgumentError(MethodParameter param, String message) {
	return "Could not resolve parameter [" + param.getParameterIndex() + "] in " +
			param.getExecutable().toGenericString() + (StringUtils.hasText(message) ? ": " + message : "");
}
 

private boolean hasErrorsArgument(MethodParameter parameter) {
	int i = parameter.getParameterIndex();
	Class<?>[] paramTypes = parameter.getExecutable().getParameterTypes();
	return (paramTypes.length > i + 1 && Errors.class.isAssignableFrom(paramTypes[i + 1]));
}
 

/**
 * Find {@link Annotation} from {@link MethodParameter method parameter or method return type}
 *
 * @param methodParameter {@link MethodParameter method parameter or method return type}
 * @param annotationClass {@link Annotation} type
 * @param <A>             {@link Annotation} type
 * @return {@link Annotation} If found , return <code>null</code>
 */
public static <A extends Annotation> A findAnnotation(MethodParameter methodParameter, Class<A> annotationClass) {

    A annotation = null;

    boolean isReturnType = methodParameter.getParameterIndex() < 0;

    if (isReturnType) {

        annotation = methodParameter.getMethodAnnotation(annotationClass);

    } else { // is parameter

        annotation = methodParameter.getParameterAnnotation(annotationClass);

    }


    return annotation;

}
 

private String getParameterName(MethodParameter param) {
	String paramName = param.getParameterName();
	return (paramName != null ? paramName : "Arg " + param.getParameterIndex());
}
 

private boolean hasErrorsArgument(MethodParameter parameter) {
	int i = parameter.getParameterIndex();
	Class<?>[] paramTypes = parameter.getExecutable().getParameterTypes();
	return (paramTypes.length > i + 1 && Errors.class.isAssignableFrom(paramTypes[i + 1]));
}
 

/**
 * Whether to raise a fatal bind exception on validation errors.
 * @param binder the data binder used to perform data binding
 * @param parameter the method parameter descriptor
 * @return {@code true} if the next method argument is not of type {@link Errors}
 * @since 4.1.5
 */
protected boolean isBindExceptionRequired(WebDataBinder binder, MethodParameter parameter) {
	int i = parameter.getParameterIndex();
	Class<?>[] paramTypes = parameter.getExecutable().getParameterTypes();
	boolean hasBindingResult = (paramTypes.length > (i + 1) && Errors.class.isAssignableFrom(paramTypes[i + 1]));
	return !hasBindingResult;
}
 

/**
 * Whether to raise a {@link org.springframework.validation.BindException} on bind or validation errors.
 * The default implementation returns {@code true} if the next method
 * argument is not of type {@link org.springframework.validation.Errors}.
 *
 * @param binder    the data binder used to perform data binding
 * @param parameter the method argument
 */
protected boolean isBindExceptionRequired(WebDataBinder binder, MethodParameter parameter) {
    int i = parameter.getParameterIndex();
    Class<?>[] paramTypes = parameter.getMethod().getParameterTypes();
    boolean hasBindingResult = (paramTypes.length > (i + 1) && Errors.class.isAssignableFrom(paramTypes[i + 1]));

    return !hasBindingResult;
}
 

/**
 * Whether to raise a fatal bind exception on validation errors.
 * @param binder the data binder used to perform data binding
 * @param methodParam the method argument
 * @return {@code true} if the next method argument is not of type {@link Errors}
 * @since 4.1.5
 */
protected boolean isBindExceptionRequired(WebDataBinder binder, MethodParameter methodParam) {
	int i = methodParam.getParameterIndex();
	Class<?>[] paramTypes = methodParam.getMethod().getParameterTypes();
	boolean hasBindingResult = (paramTypes.length > (i + 1) && Errors.class.isAssignableFrom(paramTypes[i + 1]));
	return !hasBindingResult;
}