红帽全球峰会143.2.3. KeyType 和 ValueType
- NULL it 表示键或值不存在
- BYTE 用于编写字节，java Byte 类映射到 BYTE
- 用于编写一系列字节的 BYTES。它映射 java ByteBuffer 类
- INT 用于编写 java 整数
- FLOAT 用于编写 java float
- 用于编写 java long 的 LONG
- DOUBLE for writing java double
- TEXT 用于编写 java 字符串
BYTES 还与其它内容一起使用，例如，在 Camel 中，文件作为 InputStream 发送，但 int本例以一系列字节顺序编写。
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