一、压平Json（包含JsonArray也压平）
public static void flattenJson(String prefix, Object json, Map<String, Object> flattenedMap) {
if (json instanceof JSONObject) {
JSONObject jsonObject = (JSONObject) json;
for (String key : jsonObject.keySet()) {
Object value = jsonObject.get(key);
flattenJson(prefix + key + ".", value, flattenedMap);
}
} else if (json instanceof JSONArray) {
JSONArray jsonArray = (JSONArray) json;
for (int i = 0; i < jsonArray.size(); i++) {
Object value = jsonArray.get(i);
flattenJson(prefix + i + ".", value, flattenedMap);
}
} else {
if (ObjectUtil.isEmpty(prefix)) {
flattenedMap.put("row_data", json);
} else {
flattenedMap.put(prefix.substring(0, prefix.length() - 1), json);
}
}
}
使用
public static void main(String[] args) {
Map<String, Object> flattenedMap = new LinkedHashMap<>();
String a = "{\"a\": 1,\"b\": \"b\",\"c\": {\"d\": 1},\"e\": [{\"f\": 1},\"1\",1,[{\"a\": 1}]]}";
Object parse = JSON.parse(a);
flattenJson("", parse, flattenedMap);
System.out.println(flattenedMap);
}
结果
所有层级的数据都解析出来了
二、压平Json（仅压平JsonObject）
private static void flattenJson(String prefix, JSONObject obj, Map<String, Object> flattenedMap) {
for (String key : obj.keySet()) {
Object value = obj.get(key);
if (value instanceof JSONObject) {
if (!flattenedMap.containsKey(key)) {
flattenedMap.put(key, value);
}
flattenJson(prefix + key + ".",(JSONObject) value, flattenedMap);
} else {
flattenedMap.put(prefix + key, value);
}
}
}
使用
public static void main(String[] args) {
Map<String, Object> flattenedMap = new LinkedHashMap<>();
String a = "{\"a\": 1,\"b\": \"b\",\"c\": {\"d\": 1},\"e\": [{\"f\": 1},\"1\",1,[{\"a\": 1}]]}";
JSONObject parse = JSON.parseObject(a);
flattenJson("", parse, flattenedMap);
System.out.println(flattenedMap);
}
结果
JsonArray的数据未解析