WebSocketMessage (Spring Framework 4.3.30.RELEASE API)

所有已知实现类:
AbstractWebSocketMessage, BinaryMessage, PingMessage, PongMessage, TextMessage
```
public interface WebSocketMessage<T>
```
A message that can be handled or sent on a WebSocket connection.
从以下版本开始:
4.0
作者:
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
`T`	`getPayload()`	Return the message payload (never `null`).
`int`	`getPayloadLength()`	Return the number of bytes contained in the message.
`boolean`	`isLast()`	When partial message support is available and requested via `WebSocketHandler.supportsPartialMessages()`, this method returns `true` if the current message is the last part of the complete WebSocket message sent by the client.

- 方法详细资料
  - getPayload
```
T getPayload()
```
    Return the message payload (never null).
  - getPayloadLength
```
int getPayloadLength()
```
    Return the number of bytes contained in the message.
  - isLast
```
boolean isLast()
```
    When partial message support is available and requested via WebSocketHandler.supportsPartialMessages(), this method returns true if the current message is the last part of the complete WebSocket message sent by the client. Otherwise false is returned if partial message support is either not available or not enabled.