地图>到JSON和漂亮的打印

您可以手动设置密钥名称，例如：

ArrayNode array = mapper.createArrayNode();for (Entry entry: yourMap.entries()) {  ObjectNode node = mapper.createObjectNode()      .put("name", entry.key())      .putPOJO("ids", entry.value());  array.add(node);}mapper.writevalue(file, array);

或者，您可以为数据创建一个类

class MyEntity {  String name;  Set<String> ids; // use names that you want in the JSON result  // getters, setters if necessary}

将您的数据映射转换为的列表

MyEntity

ObjectMapper

mapper.writevalue(file, listOfMyEntities)

[  {    "name": "some name here",    "ids": ["id1", "id2", ...]    }  // more elements here]