Json 杰克逊：反序列化 for each 值都具有正确类型的 Map

我有一个类似于下面的类

public class MyClass {
   private String val1;
   private String val2;
   private Map<String,Object> context;
   // Appropriate accessors removed for brevity.
   ...
}

I'm looking to be able to make the round trip with Jackson from object to JSON and back. I can serialize the object above fine and receive the following output:

{
    "val1": "foo",
    "val2": "bar",
    "context": {
        "key1": "enumValue1",
        "key2": "stringValue1",
        "key3": 3.0
    }
}

我遇到的问题是，因为序列化映射中的值没有任何类型信息，所以它们没有正确地反序列化.例如，在上面的示例中，枚举值1应该反序列化为枚举值，而不是反序列化为字符串.我已经看到了将什么类型建立在各种事物上的示例，但是在我的场景中，我不知道类型是什么(它们将是用户生成的对象，我事先不知道)，所以我需要能够用键值对序列化类型信息.我怎么才能和杰克逊一起做到这一点呢？

作为记录，我使用的是杰克逊2.4.2版.我用来测试往返的代码如下:

@Test
@SuppressWarnings("unchecked")
public void testJsonSerialization() throws Exception {
    // Get test object to serialize
    T serializationValue = getSerializationValue();
    // Serialize test object
    String json = mapper.writeValueAsString(serializationValue);
    // Test that object was serialized as expected
    assertJson(json);
    // Deserialize to complete round trip
    T roundTrip = (T) mapper.readValue(json, serializationValue.getClass());
    // Validate that the deserialized object matches the original one
    assertObject(roundTrip);
}

由于这是一个基于Spring的项目，映射器的创建过程如下:

@Configuration
public static class SerializationConfiguration {

    @Bean
    public ObjectMapper mapper() {
        Map<Class<?>, Class<?>> mixins = new HashMap<Class<?>, Class<?>>();
        // Add unrelated MixIns
        .. 

        return new Jackson2ObjectMapperBuilder()
                .featuresToDisable(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS)
                .dateFormat(new ISO8601DateFormatWithMilliSeconds())
                .mixIns(mixins)
                .build();
    }
}