红帽全球峰会264.2. 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 converter 重新解析。要使用这个选项，将 contentTypeFormat 值设置为 'json'，或调用 protobuf with second 参数。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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