Java ObjectMapper映射未正确读取列表的数据<；地图>；

我有一个

DataResponseDto.json

{
  "data": [
    {
      "customRule": {
        "code": null,
        "executionType": "ON_SUCCESS",
        "description": "Description",
        "owners": null,
        "type": "TWO",
        "enabled": true,
        "objectType": "TEST",
        "syncObjectKPIs": null,
        "inactive": false,
        "responsible": null,
        "id": "0AB58A47D3A64B56A6B74DA0E66935DD",
        "embedded": true,
        "value": null,
        "variables": [],
        "kafkaEventName": null,
        "lastChanged": 1530091858490,
        "createPerson": null,
        "externalId": null,
        "groups": null,
        "eventType": "UPDATE",
        "branches": null,
        "executionOrder": null,
        "createDateTime": null,
        "cronExpression": null,
        "udfMetaGroups": null,
        "name": "Sample1",
        "location": null,
        "permissionsType": "USER",
        "udfValues": null,
        "conditions": null,
        "actions": [
          {
            "name": "ChecklistInstance",
            "parameters": {
              "templateName": "checklist"
            }
          }
        ],
        "syncStatus": "IN_CLOUD",
        "executionLog": []
      },
      "customRule": {
        "code": null,
        "executionType": "ON_SUCCESS",
        "description": "Description",
        "owners": null,
        "type": "TWO",
        "enabled": true,
        "objectType": "TEST",
        "syncObjectKPIs": null,
        "inactive": false,
        "responsible": null,
        "id": "5033296D138C45C385AC141E1157B4FE",
        "embedded": true,
        "value": null,
        "variables": [],
        "kafkaEventName": null,
        "lastChanged": 1530091858490,
        "createPerson": null,
        "externalId": null,
        "groups": null,
        "eventType": "UPDATE",
        "branches": null,
        "executionOrder": null,
        "createDateTime": null,
        "cronExpression": null,
        "udfMetaGroups": null,
        "name": "Sample2",
        "location": null,
        "permissionsType": "USER",
        "udfValues": null,
        "conditions": null,
        "actions": [
          {
            "name": "ChecklistInstance",
            "parameters": {
              "templateName": "checklist"
            }
          }
        ],
        "syncStatus": "IN_CLOUD",
        "executionLog": []
      }
    }],
  "pageSize": 1,
  "currentPage": 0,
  "lastPage": 0,
  "totalObjectCount": 1,
  "truncated": false
}

我有一个类来映射这个JSON文件

public class DataResponseDto {
    private List<Map> data;
    private Integer pageSize;
    private Integer currentPage;
    private Integer lastPage;
    private Long totalObjectCount;
    private Boolean truncated;

// getter setter

...
}

公共类数据响应到{
私人名单数据；
私有整数页面大小；
私有整数当前页；
私有整数最后一页；
私人长计数；
私有布尔截断；
//吸气剂设定器
...
}

现在，我使用ObjectMapper将这个JSON解析为一个java类。它仅使用数据中的1个映射检索DataResponseDto。数据中应该有两张地图

ClassLoader ClassLoader=ClassLoader.getSystemClassLoader（）； File File=新文件（classLoader.getResource（“mock/DataResponseDto.json”）.getFile（）

ObjectMapper mapper=new ObjectMapper（）；
DataResponseDto DataResponseDto=mapper.readValue（文件，DataResponseDto.class）；
List rules=dataResponseDto.getData（）.stream（）.map（m->mapper.convertValue（m.get（“customRule”），RuleDto.class））.collect（Collectors.toList（））；

---

我得到了规则。size（）=1，它应该是2

您有重复的键

customRule

。尝试使用规则创建

customRules

数组，然后重新运行代码。

您的问题在于

私有列表数据
MAP不能有重复的键，考虑使用其他的东西，比如从Apache CuMon（<代码> org .Apache .Corn.Stopy.Mava.MulkKeMeP >）来使用代码> MuleKyMyPa<代码> > ./P>哦，我知道，我不能更改数据类型/数据。我们还有其他选择吗？在用正则表达式将字符串解析为JSONObject之前，您可以通过操纵字符串来解决问题。规范说它将只保留最后一个键/值对，并覆盖现有的键对。两个条目都有键“customRule”重要吗？
ObjectMapper mapper = new ObjectMapper();
DataResponseDto dataResponseDto = mapper.readValue(file, DataResponseDto.class);
List<RuleDto> rules = dataResponseDto.getData().stream().map(m -> mapper.convertValue(m.get("customRule"), RuleDto.class)).collect(Collectors.toList());