json参数化Jackson Java库的JsonProperty值

Question

我想把这具尸体和杰克逊连载

但在许多API调用中，“requestName”部分将有所不同

所以这部分我有一些不同的对象

问题是我想参数化这个JsonProperty的名称，但是注释不接受这个变量

当我编译它时，我得到了这个错误：

/home/duma/IdeaProjects/API Testing/src/test/java/SingleRequest.java:16:19
java: element value must be a constant expression

你知道吗

正文：

"singleRequest": {
        "requestName": {
            "canReplaceSpellCheckerQuery": false,
            "language": "fa",
            "query": "test",
            "scope": "app",
            "entities": ""
        }
    }

代码：

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;

public class SingleRequest {
   
    private Object object;
    @JsonIgnore
    private String requestName;

    SingleRequest(Object request, String requestName){
        this.object = request;
        this.requestName = requestName;
    }

    @JsonProperty(value = requestName)
    public Object getObject() {
        return object;
    }

    public void setObject(Object object) {
        this.object = object;
    }
    
    public String getRequestName() {
        return requestName;
    }
    public void setRequestName(String requestName) {
        this.requestName = requestName;
    }
}

Answer 1

考虑到您希望生成的JSON文档：

"singleRequest": {
        "requestName": {
            "canReplaceSpellCheckerQuery": false,
            "language": "fa",
            "query": "test",
            "scope": "app",
            "entities": ""
        }
    }

如果希望参数化字段"requestName"对应的键，则可以尝试以下代码：

public class RequestDocument implements Serializable {
    Map<String, RequestOptions> singleRequest;

    public RequestDocument(Map<String, RequestOptions> singleRequest) {
        this.singleRequest = singleRequest;
    }

    public RequestDocument(String requestName, RequestOptions options) {
        this.singleRequest = new HashMap<String, RequestOptions>() {{
                put(requestName, options);
            }
        };
    }

    public static RequestDocument makeSample() {
        return new RequestDocument("requestName", RequestOptions.makeSample());
    }

    public String toJsonString() throws IOException {
        return new ObjectMapper()
                .setVisibility(PropertyAccessor.FIELD, Visibility.ANY) // just because I have no setter/getter
                .writerWithDefaultPrettyPrinter()
                .writeValueAsString(this);
    }
}

其中RequestOptions是：

public class RequestOptions implements Serializable {
    Boolean canReplaceSpellCheckerQuery;
    String language;
    String query;
    String scope;
    String entities;

    public RequestOptions(Boolean canReplaceSpellCheckerQuery, String lang, String query, String scope, String entities) {
        this.canReplaceSpellCheckerQuery = canReplaceSpellCheckerQuery;
        this.language = lang;
        this.query = query;
        this.scope = scope;
        this.entities = entities;
    }        
    
    public static RequestOptions makeSample() {
        return new RequestOptions(false, "fa", "test", "app", "");
    }
}

通过运行以下代码：

 public static void main(String[] args) throws IOException {
        RequestDocument example = RequestDocument.makeSample();
        logger.info(example.toJsonString());
    }

输出结果正是这样：

{
  "singleRequest" : {
    "requestName" : {
      "canReplaceSpellCheckerQuery" : false,
      "language" : "fa",
      "query" : "test",
      "scope" : "app",
      "entities" : ""
    }
  }
}

我相信这是实现目标的最简单方法，但也有其他选择。你可以从阅读这篇文章和相关文章开始：https://www.baeldung.com/jackson-map

请注意，提供的代码只是一个示例，没有经过特别的润色