如何使用jackson将json数据下面的反序列化到集合列表中？

Question

{
    "TOTALRECORDCOUNT": 588,
    "RECORDCOUNT": 588,
    "HASMORE": false,
    "RECORDSET": {
        "COLUMNS": [
            "PARTNERSEGMENTID",
            "ORGANIZATIONID",
            "ORGANIZATIONNAME",
            "PROGRAMTRACK",
            "PARTNERLEVEL"
        ],
        "DATA": [
            [
                "Partner_Segment_GES",
                1,
                "Relayware",
                "ProgramTrack_SolutionPartner",
                "AuthorizedLevel"
            ],
            [
                "Partner_Segment_GES",
                2,
                "Tata Communications",
                "ProgramTrack_SolutionPartner",
                null
            ],

Answer 1

您可以使用jackson @JsonRootName注释，因为您发布的json只有一个顶级键。如果还有更多，你可以创建一个pojo，其中recordSet是一个字段。

1. 当json只有recordSet作为顶级键时的情况： 这是代码：记录集的Pojo

   @JsonRootName("RECORDSET")
   class RecordSet{
   
      @JsonProperty("DATA")
      List<List<String>> data;
   
      @JsonProperty("COLUMNS")
      List<String> columns;
   
      //getter and setter
   }
   

将json反序列化为RecordSet对象的代码

String jsonString="{ \"RECORDSET\": { \"COLUMNS\": [ \"MEMBERSHIPLEVEL\", \"PARTNERSEGMENTID\", \"ORGANIZATIONID\", \"ORGANIZATIONNAME\", \"PROGRAMTRACK\", \"CREATED\" ], \"DATA\": [ [ \"ProgramLevel_Premier\", \"Partner_Segment_GES\", 2, \"Tata Communications\", \"ProgramTrack_SolutionPartner\", \"2008-06-10T20:03:07Z\" ] ] } }";

        ObjectMapper mapper=new ObjectMapper();
        mapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);

        RecordSet recordSet = mapper.readValue(jsonString, RecordSet.class);

       //The below two statements can be replaced with the logic that you want to operate on deserialized object
        System.out.println(recordSet.getColumns());
        System.out.println(recordSet.getData());

1. 当totalRecordSetCount和其他字段是顶级json的一部分时的情况：

   class Response{
   
      @JsonProperty("HASMORE")
      private boolean hasMore;
   
      @JsonProperty("RECORDCOUNT")
      private int recordCount;
   
      @JsonProperty("TOTALRECORDCOUNT")
      private int totalRecordCount;
   
      @JsonProperty("RECORDSET")
      RecordSet recordSet;
   
     //getter and setter
   }
   

从案例＃1

获取RecordSet pojo

反序列化代码：

  ObjectMapper mapper=new ObjectMapper();
            Response response = mapper.readValue(jsonString, Response.class);

            RecordSet recordSet = response.getRecordSet();


 //The below two statements can be replaced with the 
 //logic that you want to operate on deserialized object

            System.out.println(recordSet.getColumns());
            System.out.println(recordSet.getData());