當(dāng)你希望在 Map 中不使用 String 為 Key，那么你需要使用?MessagePackKeySerializer?來為 key 進(jìn)行序列化。

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本測試方法，可以在?https://github.com/cwiki-us-demo/serialize-deserialize-demo-java/blob/master/src/test/java/com/insight/demo/serialize/MessagePackSerializer.java?中找到。

/**
?*?testMessagePackSerializationMapKey
?*/
@Test
@JsonSerialize(keyUsing?=?MessagePackKeySerializer.class)
public?void?testMessagePackSerializationMapKey()?{
????logger.debug("testMessagePackSerializationNotCloseInputStream");

????byte[]?bytes?=?new?byte[0];
????Integer?uuid_a?=?101;
????Integer?uuid_b?=?102;

????//?Instantiate?ObjectMapper?for?MessagePack
????ObjectMapper?objectMapper?=?new?ObjectMapper(new?MessagePackFactory());

????Map?map?=?new?HashMap<>();
????MessageData?messageData?=?new?MessageData();

????//?Element?A?in?MAP
????messageData.setUuid(UUID.randomUUID().toString());
????messageData.setName("CWIKI.US?-?A");
????map.put(uuid_a,?messageData);

????//?Element?B?in?MAP
????messageData?=?new?MessageData();
????messageData.setUuid(UUID.randomUUID().toString());
????messageData.setName("CWIKI.US?-?B");
????map.put(uuid_b,?messageData);


????try?{
????????//?Serialize?a?Java?object?to?byte?array
????????bytes?=?objectMapper.writeValueAsBytes(map);
????????logger.debug("Length?of?Bytes:?[{}]",?bytes.length);

????????//?Deserialize?the?byte?array?to?a?MAP
????????Map?deserialized?=?objectMapper.readValue(bytes,?new?TypeReference>()?{
????????});
????????logger.debug("Deserialized?MAP?Count:?[{}]",?deserialized.size());
????????logger.debug("MAP?index?0:?[{}]",?deserialized.get(uuid_a).getName());

????????assertEquals("CWIKI.US?-?A",?deserialized.get(uuid_a).getName());

????}?catch?(JsonProcessingException?ex)?{
????????logger.error("Serialize?Error",?ex);
????}?catch?(IOException?e)?{
????????e.printStackTrace();
????}
}

?

https://www.cwiki.us/display/Serialization/MessagePack+Jackson+Dataformat