org.springframework.util.ClassUtils#getDescriptiveType ( )源码实例Demo

@Override
public Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception {
	Class<?> targetMessageType = parameter.getParameterType();
	Class<?> targetPayloadType = getPayloadType(parameter, message);

	if (!targetMessageType.isAssignableFrom(message.getClass())) {
		throw new MethodArgumentTypeMismatchException(message, parameter, "Actual message type '" +
				ClassUtils.getDescriptiveType(message) + "' does not match expected type '" +
				ClassUtils.getQualifiedName(targetMessageType) + "'");
	}

	Object payload = message.getPayload();
	if (targetPayloadType.isInstance(payload)) {
		return message;
	}

	if (isEmptyPayload(payload)) {
		throw new MessageConversionException(message, "Cannot convert from actual payload type '" +
				ClassUtils.getDescriptiveType(payload) + "' to expected payload type '" +
				ClassUtils.getQualifiedName(targetPayloadType) + "' when payload is empty");
	}

	payload = convertPayload(message, parameter, targetPayloadType);
	return MessageBuilder.createMessage(payload, message.getHeaders());
}
 

private Object convertPayload(Message<?> message, MethodParameter parameter, Class<?> targetPayloadType) {
	Object result = null;
	if (this.converter instanceof SmartMessageConverter) {
		SmartMessageConverter smartConverter = (SmartMessageConverter) this.converter;
		result = smartConverter.fromMessage(message, targetPayloadType, parameter);
	}
	else if (this.converter != null) {
		result = this.converter.fromMessage(message, targetPayloadType);
	}

	if (result == null) {
		throw new MessageConversionException(message, "No converter found from actual payload type '" +
				ClassUtils.getDescriptiveType(message.getPayload()) + "' to expected payload type '" +
				ClassUtils.getQualifiedName(targetPayloadType) + "'");
	}
	return result;
}
 

private Object convertPayload(Message<?> message, MethodParameter parameter,
		Class<?> targetPayloadType) {
	Object result = null;
	if (this.messageConverter instanceof SmartMessageConverter) {
		SmartMessageConverter smartConverter = (SmartMessageConverter) this.messageConverter;
		result = smartConverter.fromMessage(message, targetPayloadType, parameter);
	}
	else if (this.messageConverter != null) {
		result = this.messageConverter.fromMessage(message, targetPayloadType);
	}

	if (result == null) {
		throw new MessageConversionException(message,
				"No converter found from actual payload type '"
						+ ClassUtils.getDescriptiveType(message.getPayload())
						+ "' to expected payload type '"
						+ ClassUtils.getQualifiedName(targetPayloadType) + "'");
	}
	return result;
}
 

/**
 * Create a new {@code TypeMismatchException}.
 * @param propertyChangeEvent the PropertyChangeEvent that resulted in the problem
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 */
public TypeMismatchException(PropertyChangeEvent propertyChangeEvent, @Nullable Class<?> requiredType,
		@Nullable Throwable cause) {

	super(propertyChangeEvent,
			"Failed to convert property value of type '" +
			ClassUtils.getDescriptiveType(propertyChangeEvent.getNewValue()) + "'" +
			(requiredType != null ?
			" to required type '" + ClassUtils.getQualifiedName(requiredType) + "'" : "") +
			(propertyChangeEvent.getPropertyName() != null ?
			" for property '" + propertyChangeEvent.getPropertyName() + "'" : ""),
			cause);
	this.propertyName = propertyChangeEvent.getPropertyName();
	this.value = propertyChangeEvent.getNewValue();
	this.requiredType = requiredType;
}
 

@Override
public Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception {
	Class<?> targetMessageType = parameter.getParameterType();
	Class<?> targetPayloadType = getPayloadType(parameter);

	if (!targetMessageType.isAssignableFrom(message.getClass())) {
		throw new MethodArgumentTypeMismatchException(message, parameter, "Actual message type '" +
				ClassUtils.getDescriptiveType(message) + "' does not match expected type '" +
				ClassUtils.getQualifiedName(targetMessageType) + "'");
	}

	Object payload = message.getPayload();
	if (targetPayloadType.isInstance(payload)) {
		return message;
	}

	if (isEmptyPayload(payload)) {
		throw new MessageConversionException(message, "Cannot convert from actual payload type '" +
				ClassUtils.getDescriptiveType(payload) + "' to expected payload type '" +
				ClassUtils.getQualifiedName(targetPayloadType) + "' when payload is empty");
	}

	payload = convertPayload(message, parameter, targetPayloadType);
	return MessageBuilder.createMessage(payload, message.getHeaders());
}
 

private Object convertPayload(Message<?> message, MethodParameter parameter, Class<?> targetPayloadType) {
	Object result = null;
	if (this.converter instanceof SmartMessageConverter) {
		SmartMessageConverter smartConverter = (SmartMessageConverter) this.converter;
		result = smartConverter.fromMessage(message, targetPayloadType, parameter);
	}
	else if (this.converter != null) {
		result = this.converter.fromMessage(message, targetPayloadType);
	}

	if (result == null) {
		throw new MessageConversionException(message, "No converter found from actual payload type '" +
				ClassUtils.getDescriptiveType(message.getPayload()) + "' to expected payload type '" +
				ClassUtils.getQualifiedName(targetPayloadType) + "'");
	}
	return result;
}
 

/**
 * Create a new {@code TypeMismatchException} without a {@code PropertyChangeEvent}.
 * @param value the offending value that couldn't be converted (may be {@code null})
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 * @see #initPropertyName
 */
public TypeMismatchException(@Nullable Object value, @Nullable Class<?> requiredType, @Nullable Throwable cause) {
	super("Failed to convert value of type '" + ClassUtils.getDescriptiveType(value) + "'" +
			(requiredType != null ? " to required type '" + ClassUtils.getQualifiedName(requiredType) + "'" : ""),
			cause);
	this.value = value;
	this.requiredType = requiredType;
}
 

@Override
public Object resolveArgument(MethodParameter parameter, Message<?> message)
		throws Exception {
	Class<?> targetMessageType = parameter.getParameterType();
	Class<?> targetPayloadType = getPayloadType(parameter);

	if (!targetMessageType.isAssignableFrom(message.getClass())) {
		throw new MethodArgumentTypeMismatchException(message, parameter,
				"Actual message type '" + ClassUtils.getDescriptiveType(message)
						+ "' does not match expected type '"
						+ ClassUtils.getQualifiedName(targetMessageType) + "'");
	}

	Class<?> payloadClass = message.getPayload().getClass();

	if (message instanceof ErrorMessage
			|| conversionNotRequired(payloadClass, targetPayloadType)) {
		return message;
	}
	Object payload = message.getPayload();
	if (isEmptyPayload(payload)) {
		throw new MessageConversionException(message,
				"Cannot convert from actual payload type '"
						+ ClassUtils.getDescriptiveType(payload)
						+ "' to expected payload type '"
						+ ClassUtils.getQualifiedName(targetPayloadType)
						+ "' when payload is empty");
	}

	payload = convertPayload(message, parameter, targetPayloadType);
	return MessageBuilder.createMessage(payload, message.getHeaders());
}
 

/**
 * Create a new {@code TypeMismatchException} without a {@code PropertyChangeEvent}.
 * @param value the offending value that couldn't be converted (may be {@code null})
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 * @see #initPropertyName
 */
public TypeMismatchException(@Nullable Object value, @Nullable Class<?> requiredType, @Nullable Throwable cause) {
	super("Failed to convert value of type '" + ClassUtils.getDescriptiveType(value) + "'" +
			(requiredType != null ? " to required type '" + ClassUtils.getQualifiedName(requiredType) + "'" : ""),
			cause);
	this.value = value;
	this.requiredType = requiredType;
}
 

/**
 * Create a new TypeMismatchException.
 * @param propertyChangeEvent the PropertyChangeEvent that resulted in the problem
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 */
public TypeMismatchException(PropertyChangeEvent propertyChangeEvent, Class<?> requiredType, Throwable cause) {
	super(propertyChangeEvent,
			"Failed to convert property value of type '" +
			ClassUtils.getDescriptiveType(propertyChangeEvent.getNewValue()) + "'" +
			(requiredType != null ?
			 " to required type '" + ClassUtils.getQualifiedName(requiredType) + "'" : "") +
			(propertyChangeEvent.getPropertyName() != null ?
			 " for property '" + propertyChangeEvent.getPropertyName() + "'" : ""),
			cause);
	this.value = propertyChangeEvent.getNewValue();
	this.requiredType = requiredType;
}
 

/**
 * Create a new TypeMismatchException without PropertyChangeEvent.
 * @param value the offending value that couldn't be converted (may be {@code null})
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 */
public TypeMismatchException(Object value, Class<?> requiredType, Throwable cause) {
	super("Failed to convert value of type '" + ClassUtils.getDescriptiveType(value) + "'" +
			(requiredType != null ? " to required type '" + ClassUtils.getQualifiedName(requiredType) + "'" : ""),
			cause);
	this.value = value;
	this.requiredType = requiredType;
}
 

/**
 * Create a new TypeMismatchException.
 * @param propertyChangeEvent the PropertyChangeEvent that resulted in the problem
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 */
public TypeMismatchException(PropertyChangeEvent propertyChangeEvent, Class<?> requiredType, Throwable cause) {
	super(propertyChangeEvent,
			"Failed to convert property value of type '" +
			ClassUtils.getDescriptiveType(propertyChangeEvent.getNewValue()) + "'" +
			(requiredType != null ?
			 " to required type '" + ClassUtils.getQualifiedName(requiredType) + "'" : "") +
			(propertyChangeEvent.getPropertyName() != null ?
			 " for property '" + propertyChangeEvent.getPropertyName() + "'" : ""),
			cause);
	this.value = propertyChangeEvent.getNewValue();
	this.requiredType = requiredType;
}
 

/**
 * Create a new TypeMismatchException without PropertyChangeEvent.
 * @param value the offending value that couldn't be converted (may be {@code null})
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 */
public TypeMismatchException(Object value, Class<?> requiredType, Throwable cause) {
	super("Failed to convert value of type '" + ClassUtils.getDescriptiveType(value) + "'" +
			(requiredType != null ? " to required type '" + ClassUtils.getQualifiedName(requiredType) + "'" : ""),
			cause);
	this.value = value;
	this.requiredType = requiredType;
}
 

/**
 * Create a new TypeMismatchException.
 * @param propertyChangeEvent the PropertyChangeEvent that resulted in the problem
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 */
public TypeMismatchException(PropertyChangeEvent propertyChangeEvent, Class<?> requiredType, Throwable cause) {
	super(propertyChangeEvent,
			"Failed to convert property value of type [" +
			ClassUtils.getDescriptiveType(propertyChangeEvent.getNewValue()) + "]" +
			(requiredType != null ?
			 " to required type [" + ClassUtils.getQualifiedName(requiredType) + "]" : "") +
			(propertyChangeEvent.getPropertyName() != null ?
			 " for property '" + propertyChangeEvent.getPropertyName() + "'" : ""),
			cause);
	this.value = propertyChangeEvent.getNewValue();
	this.requiredType = requiredType;
}
 

/**
 * Create a new TypeMismatchException without PropertyChangeEvent.
 * @param value the offending value that couldn't be converted (may be {@code null})
 * @param requiredType the required target type (or {@code null} if not known)
 * @param cause the root cause (may be {@code null})
 */
public TypeMismatchException(Object value, Class<?> requiredType, Throwable cause) {
	super("Failed to convert value of type [" + ClassUtils.getDescriptiveType(value) + "]" +
			(requiredType != null ? " to required type [" + ClassUtils.getQualifiedName(requiredType) + "]" : ""),
			cause);
	this.value = value;
	this.requiredType = requiredType;
}
 

/**
 * Perform the actual reading of an invocation result object from the
 * given ObjectInputStream.
 * <p>The default implementation simply calls
 * {@link java.io.ObjectInputStream#readObject()}.
 * Can be overridden for deserialization of a custom wrapper object rather
 * than the plain invocation, for example an encryption-aware holder.
 * @param ois the ObjectInputStream to read from
 * @return the RemoteInvocationResult object
 * @throws java.io.IOException in case of I/O failure
 * @throws ClassNotFoundException if case of a transferred class not
 * being found in the local ClassLoader
 */
protected RemoteInvocation doReadRemoteInvocation(ObjectInputStream ois)
		throws IOException, ClassNotFoundException {

	Object obj = ois.readObject();
	if (!(obj instanceof RemoteInvocation)) {
		throw new RemoteException("Deserialized object needs to be assignable to type [" +
				RemoteInvocation.class.getName() + "]: " + ClassUtils.getDescriptiveType(obj));
	}
	return (RemoteInvocation) obj;
}
 

/**
 * Perform the actual reading of an invocation result object from the
 * given ObjectInputStream.
 * <p>The default implementation simply calls
 * {@link java.io.ObjectInputStream#readObject()}.
 * Can be overridden for deserialization of a custom wrapper object rather
 * than the plain invocation, for example an encryption-aware holder.
 * @param ois the ObjectInputStream to read from
 * @return the RemoteInvocationResult object
 * @throws java.io.IOException in case of I/O failure
 * @throws ClassNotFoundException if case of a transferred class not
 * being found in the local ClassLoader
 */
protected RemoteInvocation doReadRemoteInvocation(ObjectInputStream ois)
		throws IOException, ClassNotFoundException {

	Object obj = ois.readObject();
	if (!(obj instanceof RemoteInvocation)) {
		throw new RemoteException("Deserialized object needs to be assignable to type [" +
				RemoteInvocation.class.getName() + "]: " + ClassUtils.getDescriptiveType(obj));
	}
	return (RemoteInvocation) obj;
}
 

/**
 * Perform the actual reading of an invocation object from the
 * given ObjectInputStream.
 * <p>The default implementation simply calls {@code readObject}.
 * Can be overridden for deserialization of a custom wrapper object rather
 * than the plain invocation, for example an encryption-aware holder.
 * @param ois the ObjectInputStream to read from
 * @return the RemoteInvocationResult object
 * @throws IOException if thrown by I/O methods
 * @throws ClassNotFoundException if the class name of a serialized object
 * couldn't get resolved
 * @see java.io.ObjectOutputStream#writeObject
 */
protected RemoteInvocationResult doReadRemoteInvocationResult(ObjectInputStream ois)
		throws IOException, ClassNotFoundException {

	Object obj = ois.readObject();
	if (!(obj instanceof RemoteInvocationResult)) {
		throw new RemoteException("Deserialized object needs to be assignable to type [" +
				RemoteInvocationResult.class.getName() + "]: " + ClassUtils.getDescriptiveType(obj));
	}
	return (RemoteInvocationResult) obj;
}
 

/**
 * Perform the actual reading of an invocation result object from the
 * given ObjectInputStream.
 * <p>The default implementation simply calls
 * {@link java.io.ObjectInputStream#readObject()}.
 * Can be overridden for deserialization of a custom wrapper object rather
 * than the plain invocation, for example an encryption-aware holder.
 * @param ois the ObjectInputStream to read from
 * @return the RemoteInvocationResult object
 * @throws java.io.IOException in case of I/O failure
 * @throws ClassNotFoundException if case of a transferred class not
 * being found in the local ClassLoader
 */
protected RemoteInvocation doReadRemoteInvocation(ObjectInputStream ois)
		throws IOException, ClassNotFoundException {

	Object obj = ois.readObject();
	if (!(obj instanceof RemoteInvocation)) {
		throw new RemoteException("Deserialized object needs to be assignable to type [" +
				RemoteInvocation.class.getName() + "]: " + ClassUtils.getDescriptiveType(obj));
	}
	return (RemoteInvocation) obj;
}
 

/**
 * Perform the actual reading of an invocation object from the
 * given ObjectInputStream.
 * <p>The default implementation simply calls {@code readObject}.
 * Can be overridden for deserialization of a custom wrapper object rather
 * than the plain invocation, for example an encryption-aware holder.
 * @param ois the ObjectInputStream to read from
 * @return the RemoteInvocationResult object
 * @throws IOException if thrown by I/O methods
 * @throws ClassNotFoundException if the class name of a serialized object
 * couldn't get resolved
 * @see java.io.ObjectOutputStream#writeObject
 */
protected RemoteInvocationResult doReadRemoteInvocationResult(ObjectInputStream ois)
		throws IOException, ClassNotFoundException {

	Object obj = ois.readObject();
	if (!(obj instanceof RemoteInvocationResult)) {
		throw new RemoteException("Deserialized object needs to be assignable to type [" +
				RemoteInvocationResult.class.getName() + "]: " + ClassUtils.getDescriptiveType(obj));
	}
	return (RemoteInvocationResult) obj;
}