嵌套的JSONObject反序列化为JSONObject

Question

所以我正在进行反序列化嵌套JSONObject，但不想为每个嵌套对象创建一个类。我试图接受嵌套的JSONObjects并将其放在JSONObject中。

public class ContainerStatus {

@JsonProperty("name")
private String name;
@JsonProperty("state")
private JSONObject state;
@JsonProperty("lastState")
private JSONObject  lastState;
@JsonProperty("ready")
private Boolean ready;
@JsonProperty("restartCount")
private Integer restartCount;
@JsonProperty("image")
private String image;
@JsonProperty("imageID")
private String imageID;
@JsonProperty("containerID")
private String containerID;
@JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();

使用它来反序列化：

 { "containerStatuses": 
        {
            "name": "connect",
            "state": {
                        "terminated": {
                            "exitCode": 1,
                            "reason": "Error",
                            "startedAt": "2019-03-20T15:40:08Z",
                            "finishedAt": "2019-03-20T15:40:50Z",
                            "containerID": "docker://"
                        }
                    },
            "lastState": {},
            "ready": true,
            "restartCount": 0,
            "image": "image",
            "imageID": "docker-pullable://",
            "containerID": "docker://"
        }}

由于状态JSONObject，我得到无法识别的字段“已终止”。

我想要一个：

JsonObject state =  {
                            "terminated": {
                                "exitCode": 1,
                                "reason": "Error",
                                "startedAt": "2019-03-20T15:40:08Z",
                                "finishedAt": "2019-03-20T15:40:50Z",
                                "containerID": "docker://"
                            }
                        }

我可以将它转换为通用对象，但格式不再是JSON：

@JsonProperty("state")
private Object state;

Gives me this format:
{running={startedAt=2019-03-20T14:53:53Z}}

Answer 1

你需要改进一点你的例子：

• DeserializationFeature.UNWRAP_ROOT_VALUE，启用此功能以解开JSON对象。
• 将JsonRootName注释添加到POJO类，因为类名与属性containerStatuses不匹配。
• 使用JsonNode来自Jackson库，而不是来自JSONObject的org.json。

改进的示例如下所示：

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonRootName;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonApp {

    public static void main(String[] args) throws Exception {
        String json = "{...}";
        ObjectMapper mapper = new ObjectMapper();
        mapper.enable(DeserializationFeature.UNWRAP_ROOT_VALUE);

        ContainerStatus cs = mapper.readValue(json, ContainerStatus.class);
        System.out.println(cs.getState());
    }
}

@JsonRootName("containerStatuses")
class ContainerStatus {

    @JsonProperty("name")
    private String name;
    @JsonProperty("state")
    private JsonNode state;
    @JsonProperty("lastState")
    private JsonNode lastState;
    @JsonProperty("ready")
    private Boolean ready;
    @JsonProperty("restartCount")
    private Integer restartCount;
    @JsonProperty("image")
    private String image;
    @JsonProperty("imageID")
    private String imageID;
    @JsonProperty("containerID")
    private String containerID;

    // getters, setters, toString
}

上面的代码打印：

{"terminated":{"exitCode":1,"reason":"Error","startedAt":"2019-03-20T15:40:08Z","finishedAt":"2019-03-20T15:40:50Z","containerID":"docker://"}}