将 JSON 映射到 POJO 进行处理 - 无法识别的字段未标记为可忽略

Question

我需要帮助映射以下 JSON 结构以进行进一步处理。

    [{
    "userId": "11",
    "otherId": "a",
    "key1": "Tesla",
    "key2": "S3",
    "behaviour": {
        "color": "white",
        "size": "S",
        "owner": "Mr. A"
    }
}, 
{
    "userId": "22",
    "otherId": "",
    "key1": "Merc",
    "key2": "C-Class",
    "behaviour": {
        "color": "black",
        "size": "M",
        "isNew": true
    }
},
{
    "userId": "33",
    "otherId": "c",
    "key1": "Honda",
    "key2": "CRV",
    "behaviour": {
        "color": "green",
        "size": "L",
    }
}]

以下是我拥有的 POJO：

public class MainObject {
    private String userId;
    private String otherId;
    private String key1;
    private String key2;
    private Set<Behaviour> behaviours;
}

public class Behaviour {
    private final String name;
    private final Object value;
}

我需要获取 MainObject 列表以进行进一步处理。 在下面尝试过，但不确定如何映射行为集 -

String inputLine = currentBufferedReader.readLine();
//Above String has complete JSON

ObjectMapper objectMapper = new ObjectMapper();
FirstObject[] firstObjects = objectMapper.readValue(inputLine, FirstObject[].class);

我得到：无法识别的字段未使用上述代码标记为可忽略。 请建议。

Answer 1

像belwo一样定义你的类

class MainObject {
    public String userId;
    public String otherId;
    public String key1;
    public String key2;
    @JsonProperty(value = "behaviour")
    public Map<String, String> behaviours;
    @Override
    public String toString() {
        return "MainObject [userId=" + userId + ", otherId=" + otherId + ", key1=" + key1 + ", key2=" + key2
                + ", behaviours=" + behaviours + "]";
    }
}

要映射的代码

public static void main(String[] args) throws IOException  {
    String array = "[\r\n" + 
            "   {\r\n" + 
            "      \"userId\":\"11\",\r\n" + 
            "      \"otherId\":\"a\",\r\n" + 
            "      \"key1\":\"Tesla\",\r\n" + 
            "      \"key2\":\"S3\",\r\n" + 
            "      \"behaviour\":{\r\n" + 
            "         \"color\":\"white\",\r\n" + 
            "         \"size\":\"S\",\r\n" + 
            "         \"owner\":\"Mr. A\"\r\n" + 
            "      }\r\n" + 
            "   },\r\n" + 
            "   {\r\n" + 
            "      \"userId\":\"22\",\r\n" + 
            "      \"otherId\":\"\",\r\n" + 
            "      \"key1\":\"Merc\",\r\n" + 
            "      \"key2\":\"C-Class\",\r\n" + 
            "      \"behaviour\":{\r\n" + 
            "         \"color\":\"black\",\r\n" + 
            "         \"size\":\"M\",\r\n" + 
            "         \"isNew\":true\r\n" + 
            "      }\r\n" + 
            "   },\r\n" + 
            "   {\r\n" + 
            "      \"userId\":\"33\",\r\n" + 
            "      \"otherId\":\"c\",\r\n" + 
            "      \"key1\":\"Honda\",\r\n" + 
            "      \"key2\":\"CRV\",\r\n" + 
            "      \"behaviour\":{\r\n" + 
            "         \"color\":\"green\",\r\n" + 
            "         \"size\":\"L\"\r\n" + 
            "      }\r\n" + 
            "   }\r\n" + 
            "]";
    ObjectMapper mapper = new ObjectMapper();
    MainObject[] objects = mapper.readValue(array, MainObject[].class);
    System.out.println(Arrays.asList(objects));
    
}

输出

 [MainObject [userId=11, otherId=a, key1=Tesla, key2=S3, behaviours={color=white, size=S, owner=Mr. A}], 
MainObject [userId=22, otherId=, key1=Merc, key2=C-Class, behaviours={color=black, size=M, isNew=true}],
 MainObject [userId=33, otherId=c, key1=Honda, key2=CRV, behaviours={color=green, size=L}]]