java - 在 Jackson 中使用变量名映射对象

Question

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

标签： javaserializationjacksonjson-serialization

Answer 1

IndexLifeCycleManagementPolicy 使用其对应的 JSON 属性映射 的每个实例，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 
}

Edit1：
您可以使用 MapIndexLifeCycleManagementPolicy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" 和 value = IndexLifeCycleManagementPolicyinstance。
然后，您可以使用 getter 来读取此IndexLifeCycleManagementPolicy实例 Map。