嵌套的JSONObject反序列化为JSONObject [英] Nested JSONObject Deserialize to JSONObject

问题描述

因此，我正在努力反序列化嵌套的JSONObject，但不想为每个嵌套的对象创建一个类。我正在尝试使用嵌套的JSONObject，并将其放入JSONObject。

So I'm working on deserializing a nested JSONObject, but don't want to create a class for each nested object. I was trying to take on of the nested JSONObjects and put it in a JSONObject.

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>();

使用此方法反序列化：

 { "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://"
        }}

我无法识别字段终止

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：//
}
}

我可以将其转换为通用对象，但格式不再是JSON：

I can cast it into a generic object, but the format isn't JSON anymore:

@JsonProperty("state")
private Object state;

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

推荐答案

您需要改进一下示例：

• DeserializationFeature.UNWRAP_ROOT_VALUE ，启用此功能可以使
  展开 JSON 对象。


• 将 JsonRootName 注释添加到 POJO 类中，因为类名不匹配属性 containerStatuses 。


• 使用来自 Jackson 库的 JsonNode 而不是 JSONObject ，它可能来自 org.json 。

• DeserializationFeature.UNWRAP_ROOT_VALUE, enable this feature to unwrap JSON object.
• Add JsonRootName annotation to your POJO class because class name does not match to property containerStatuses.
• Use JsonNode which comes from Jackson library instead of JSONObject which comes probably from 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
}

以上代码打印：

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

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