在 Jackson 中使用变量名映射对象

问题描述

我有以下 JSON：

{
 "filebeat": {
   "version": 2,"modified_date": "2021-01-15T14:02:41.103Z","policy": {
     "phases": {
       "hot": {
         "min_age": "0ms","actions": {
           "rollover": {
             "max_size": "30gb","max_age": "1d"
           }
         }
       },"delete": {
         "min_age": "90d","actions": {
           "wait_for_snapshot": {
             "policy": "mainbackuppolicy"
           }
         }
       }
     }
   }
 },"ilm-history-ilm-policy": {
   "version": 1,"modified_date": "2020-12-08T14:31:15.717Z","actions": {
           "rollover": {
             "max_size": "50gb","max_age": "30d"
           }
         }
       },"actions": {
           "delete": {
             "delete_searchable_snapshot": true
           }
         }
       }
     }
   }
 },"kibana-event-log-policy": {
   "version": 3,"modified_date": "2020-12-08T14:39:00.097Z","logs": {
   "version": 1,"modified_date": "2020-12-08T14:31:15.227Z","max_age": "30d"
           }
         }
       }
     }
   }
 },"metricbeat": {
   "version": 2,"modified_date": "2021-01-15T14:02:42.090Z","metrics": {
   "version": 1,"modified_date": "2020-12-08T14:31:15.475Z","ml-size-based-ilm-policy": {
   "version": 1,"modified_date": "2020-12-08T14:31:15.083Z","actions": {
           "rollover": {
             "max_size": "50gb"
           }
         }
       }
     }
   }
 },"slm-history-ilm-policy": {
   "version": 1,"modified_date": "2020-12-08T14:31:15.585Z","synthetics": {
   "version": 1,"modified_date": "2020-12-08T14:31:15.352Z","watch-history-ilm-policy": {
   "version": 1,"modified_date": "2020-12-08T14:31:15.792Z","policy": {
     "phases": {
       "delete": {
         "min_age": "7d","actions": {
           "delete": {
             "delete_searchable_snapshot": true
           }
         }
       }
     }
   }
 }
}

我不知道如何将这些 JSON 元素映射到相应的对象，因为它的名称是可变的，例如filebeat、ilm-history-ilm-policy 等

我创建了以下对象：

public class IndexLifeCycleManagement {
    private IndexLifeCycleManagementPolicy indexLifeCycleManagementPolicy;
}

public class IndexLifeCycleManagementPolicy {

    @JsonProperty("modified_date")
    private String modifiedDate;

    @JsonProperty("version")
    private int version;

    @JsonProperty("policy")
    private Policy policy;
}

但我认为问题在于杰克逊无法将 filebeat 映射到 IndexLifecycleManagement-object

提前致谢 问候

解决方法

将 IndexLifeCycleManagementPolicy 的每个实例与其对应的 JSON 属性进行映射，如下所示：

class IndexLifeCycleManagementPolicy{
    @JsonProperty("modified_date")
    private String modifiedDate;

    @JsonProperty("version")
    private int version;

    @JsonProperty("policy")
    private Policy policy;
}

class IndexLifeCycleManagement{
    @JsonProperty("ilm-history-ilm-policy")
    public IndexLifeCycleManagementPolicy ilmHistoryIlmPolicy;

    @JsonProperty("filebeat")
    public IndexLifeCycleManagementPolicy filebeat;

    // similarly for every other attribute at this level 
}

编辑1：
您可以使用 IndexLifeCycleManagementPolicy 的 Map 并通过 JsonAnySetter 注释动态设置它们，如下所示：

class IndexLifeCycleManagement{

    public Map<String,IndexLifeCycleManagementPolicy> getIndexLifeCycleManagementPolicyMap() {
        return indexLifeCycleManagementPolicyMap;
    }

    @JsonAnySetter
    public void setIndexLifeCycleManagementPolicyMap(String key,IndexLifeCycleManagementPolicy policy) {
        indexLifeCycleManagementPolicyMap.put(key,policy);
    }

    Map<String,IndexLifeCycleManagementPolicy> indexLifeCycleManagementPolicyMap = new HashMap<>();
}

例如： key = "filebeat" and value = IndexLifeCycleManagementPolicy 实例。
然后，您可以使用 getter 来读取此 IndexLifeCycleManagementPolicy 实例的 Map。

,

它可以，您需要创建一个对象，该对象将包含名为 filebeat、ilm-history-ilm-policy 等类型为 IndexLifeCycleManagementPolicy 的字段。 示例：

类 YourJsonObject private IndexLifeCycleManagementPolicy ilm-history-ilm-policy; private IndexLifeCycleManagementPolicy fileBeat 等