红帽全球峰会266.3. 内容类型格式（从 Camel 2.19开始）
可以解析 JSON 消息，将其转换为 protobuf 格式，并使用原生 util 转换程序将其返回。要使用这个选项，请将 contentTypeFormat 值设置为 'json' 或调用带有第二个参数的 protobuf。如果没有指定默认实例，请始终使用原生 protobuf 格式。示例代码显示如下：
from("direct:marshal")
.unmarshal()
.protobuf("org.apache.camel.dataformat.protobuf.generated.AddressBookProtos$Person", "json")
.to("mock:reverse");
from("direct:marshal")
.unmarshal()
.protobuf("org.apache.camel.dataformat.protobuf.generated.AddressBookProtos$Person", "json")
.to("mock:reverse");
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