JSONObject优雅获取深层字段属性值

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描述介绍

根据JSONObject中字段的名称,优雅获取深层属性值

使用示例,取error_entry的数量。JSON的层次结构如下 aggregations.3.buckets.[key=error_entry].doc_count

/*
{"took": 3043,"timed_out": false,"_shards": {"total": 7,"successful": 7,"skipped": 0,"failed": 0},"hits": {"total": {"value": 38,"relation": "eq"},"max_score": null,"hits": []},"aggregations": {"3": {"doc_count_error_upper_bound": 0,"sum_other_doc_count": 0,"buckets": [{"key": "error_entry","doc_count": 34},{"key": "error_patch","doc_count": 4}]}}
}
*/public static void main(String[] args) {String jsonStr = "{\"took\":3043,\"timed_out\":false,\"_shards\":{\"total\":7,\"successful\":7,\"skipped\":0,\"failed\":0},\"hits\":{\"total\":{\"value\":38,\"relation\":\"eq\"},\"max_score\":null,\"hits\":[]},\"aggregations\":{\"3\":{\"doc_count_error_upper_bound\":0,\"sum_other_doc_count\":0,\"buckets\":[{\"key\":\"error_entry\",\"doc_count\":34},{\"key\":\"error_patch\",\"doc_count\":4}]}}};JSONObject jsonObject = JSONObject.parseObject(jsonStr); Object obj = getDeepFieldValue(jsonObject, "aggregations.3.buckets.[key=error_entry].doc_count");System.out.println(obj.toString());}

public Object getDeepFieldValue(JSONObject jsonObject, String jsonPath) {String[] split = jsonPath.split("\\.");Object currentObject = jsonObject;for (String item : split) {if (currentObject instanceof JSONObject) {JSONObject temp = (JSONObject) currentObject;if (temp.containsKey(item)) {currentObject = temp.get(item);} else {return null;}} else if (currentObject instanceof JSONArray) {JSONArray temps = (JSONArray) currentObject;String[] kv = item.replace("[", "").replace("]", "").split("=");boolean exist = false;for (Object obj : temps) {if (obj instanceof JSONObject) {JSONObject json = (JSONObject) obj;if (kv.length == 2 && json.containsKey(kv[0]) && String.valueOf(json.get(kv[0])).equals(kv[1])) {currentObject = json;exist = true;break;}}}if (!exist) {return null;}} else {return null;}}return currentObject;}