所有超级接口:
MessageConverter
所有已知实现类:
AbstractMessageConverter, ByteArrayMessageConverter, CompositeMessageConverter, MappingJackson2MessageConverter, MarshallingMessageConverter, ProtobufJsonFormatMessageConverter, ProtobufMessageConverter, StringMessageConverter
```
public interface SmartMessageConverter
extends MessageConverter
```
An extended MessageConverter SPI with conversion hint support.
In case of a conversion hint being provided, the framework will call these extended methods if a converter implements this interface, instead of calling the regular fromMessage / toMessage variants.
从以下版本开始:
4.2.1
作者:
Juergen Hoeller

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`Object`	`fromMessage(Message<?> message, Class<?> targetClass, Object conversionHint)`	A variant of `MessageConverter.fromMessage(Message, Class)` which takes an extra conversion context as an argument, allowing to take e.g. annotations on a payload parameter into account.
`Message<?>`	`toMessage(Object payload, MessageHeaders headers, Object conversionHint)`	A variant of `MessageConverter.toMessage(Object, MessageHeaders)` which takes an extra conversion context as an argument, allowing to take e.g. annotations on a return type into account.

从接口继承的方法 org.springframework.messaging.converter.MessageConverter
fromMessage, toMessage

- 方法详细资料
  - fromMessage
```
@Nullable
Object fromMessage(Message<?> message,
                   Class<?> targetClass,
                   @Nullable
                   Object conversionHint)
```
    A variant of MessageConverter.fromMessage(Message, Class) which takes an extra conversion context as an argument, allowing to take e.g. annotations on a payload parameter into account.
    参数:
    message - the input message
    targetClass - the target class for the conversion
    conversionHint - an extra object passed to the MessageConverter, e.g. the associated MethodParameter (may be null}
    返回:
    the result of the conversion, or null if the converter cannot perform the conversion
    另请参阅:
    MessageConverter.fromMessage(Message, Class)
  - toMessage
```
@Nullable
Message<?> toMessage(Object payload,
                     @Nullable
                     MessageHeaders headers,
                     @Nullable
                     Object conversionHint)
```
    A variant of MessageConverter.toMessage(Object, MessageHeaders) which takes an extra conversion context as an argument, allowing to take e.g. annotations on a return type into account.
    参数:
    payload - the Object to convert
    headers - optional headers for the message (may be null)
    conversionHint - an extra object passed to the MessageConverter, e.g. the associated MethodParameter (may be null}
    返回:
    the new message, or null if the converter does not support the Object type or the target media type
    另请参阅:
    MessageConverter.toMessage(Object, MessageHeaders)

接口 SmartMessageConverter

方法概要

从接口继承的方法 org.springframework.messaging.converter.MessageConverter

方法详细资料

fromMessage

toMessage