如果你需要把传入的jsonMap到你的List，你可以这样做

String jsonString = ...; //Your incoming json string
ObjectMapper mapper = new ObjectMapper();
Class<?> clz = Class.forName(yourTypeString);
JavaType type = mapper.getTypeFactory().constructCollectionType(List.class, clz);
List <T> result = mapper.readValue(jsonString, type);

编辑

像这样的东西，完全未经测试，从来没有做过

public Message<T> deserialize(JsonParser jsonParser, DeserializationContext arg1)
    throws IOException, JsonProcessingException {
    ObjectMapper mapper = new ObjectMapper();
    ObjectCodec oc = jsonParser.getCodec();
    JsonNode node = oc.readTree(jsonParser);

    JsonNode timeStamp = node.get("time");
    Timestamp time = mapper.readValue(timeStamp, Timestamp.class);
    JsonNode restAction = node.get("action");
    RestAction action = mapper.readValue(restAction, RestAction.class);
    String type = node.get("type").getTextValue();
    Class<?> clz = Class.forName(type);
    JsonNode list = node.get("data");
    JavaType listType = mapper.getTypeFactory().constructCollectionType(List.class,   clz);
    List <T> data = mapper.readValue(list, listType);

    Message<T> message = new Message<T>;
    message.setTime(time);
    message.setAction(action);
    message.setType(type);
    message.setData(data);

    return message;
}

您需要使用@JsonDeserialize(using = MessageDeserializer.class)对类进行注解，并实现自定义反序列化器：

public class MessageDeserializer extends JsonDeserializer<Message> {
  @Override
  public Message deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
    throws IOException, JsonProcessingException {
    // YOU DESERIALIZER CODE HERE
  }
}

@请参见此处的示例：How Do I Write a Jackson JSON Serializer & Deserializer?

自版本2.11（2020年4月）起，Jackson拥有readerForListOf方法（文档）：

ObjectMapper mapper = ObjectMapper().configure(...);
ObjectReader reader = mapper.readerForListOf(MyClass.class);
List<MyClass> list = reader.readValue(...);

这应该适用于简单的POJO和集合：

// import com.fasterxml.jackson.core.type.TypeReference;
// import com.fasterxml.jackson.databind.ObjectMapper;

// get your <T> type
final Type entryType = ...

// Create a new TypeReference object and convert
return new ObjectMapper().readValue(jsonString, new TypeReference<>() {
    @Override
    public Type getType() {
        return entryType;
    }
});

如果您需要读取泛型List中的json，请执行以下操作

{
    Employee:
    [
        {
            "key": "value",
            "key": "value"
        },
        {
            "key": "value",
            "key": "value"
        }
    ]
}

您json列表对象和bean类

class person {
private String key;
private String value;
}

现在您可以使用HashMap读取这个json
类似于

TypeReference<HashMap<String,List<Person>>> personList =  new   TypeReference<HashMap<String, List<Person>>>() {};

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

HashMap<String, List<Person>> employees = objectMapper.readValue(request.getInputStream(), personList);

短得多的东西：

mapper.readValue(jsonString, new TypeReference<List<EntryType>>() {});

其中，EntryType是对要在集合中保留的类型的引用。它可以是任何Java类。例如，要读取JSON表示形式（如["a", "b", "c"]），Map器的第二个参数应为new TypeReference<List<String>>() {}