MessageConverter (Spring Framework 5.2.12.RELEASE API)

所有已知子接口:
SmartMessageConverter
所有已知实现类:
AbstractMessageConverter, ByteArrayMessageConverter, CompositeMessageConverter, GenericMessageConverter, MappingJackson2MessageConverter, MarshallingMessageConverter, ProtobufJsonFormatMessageConverter, ProtobufMessageConverter, SimpleMessageConverter, StringMessageConverter
```
public interface MessageConverter
```
A converter to turn the payload of a Message from serialized form to a typed Object and vice versa. The MessageHeaders.CONTENT_TYPE message header may be used to specify the media type of the message content.
从以下版本开始:
4.0
作者:
Mark Fisher, Rossen Stoyanchev

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)`	Convert the payload of a `Message` from a serialized form to a typed Object of the specified target class.
`Message<?>`	`toMessage(Object payload, MessageHeaders headers)`	Create a `Message` whose payload is the result of converting the given payload Object to serialized form.

- 方法详细资料
  - fromMessage
```
@Nullable
Object fromMessage(Message<?> message,
                   Class<?> targetClass)
```
    Convert the payload of a Message from a serialized form to a typed Object of the specified target class. The MessageHeaders.CONTENT_TYPE header should indicate the MIME type to convert from.
    If the converter does not support the specified media type or cannot perform the conversion, it should return null.
    参数:
    message - the input message
    targetClass - the target class for the conversion
    返回:
    the result of the conversion, or null if the converter cannot perform the conversion
  - toMessage
```
@Nullable
Message<?> toMessage(Object payload,
                     @Nullable
                     MessageHeaders headers)
```
    Create a Message whose payload is the result of converting the given payload Object to serialized form. The optional MessageHeaders parameter may contain a MessageHeaders.CONTENT_TYPE header to specify the target media type for the conversion and it may contain additional headers to be added to the message.
    If the converter does not support the specified media type or cannot perform the conversion, it should return null.
    参数:
    payload - the Object to convert
    headers - optional headers for the message (may be null)
    返回:
    the new message, or null if the converter does not support the Object type or the target media type