在JSONArray中,我们可以使用getJSONObject()方法来获取指定位置上的JSON对象。然后,我们可以使用getString()、getInt()等方法来获取JSON对象中指定key的value值。 以下是如何根据key获取value值的示例代码: importorg.json.JSONArray;importorg.json.JSONException;importorg.json.JSONObject;publicclassMain{publicstaticvo...
取出指定key对应的value 现在,我们已经将JSON数据解析为JSONArray对象,下面我们将介绍如何从JSONArray中取出指定key对应的value。 假设我们要取出所有人的姓名(name),我们可以使用以下代码: for(inti=0;i<jsonArray.size();i++){JSONObjectjsonObject=jsonArray.getJSONObject(i);Stringname=jsonObject.getString("n...
*/publicstaticObjectgetJsonValue(String json , String key){if(StringUtils.isNotEmpty(json) && StringUtils.isNotEmpty(key)) {Objectobject=JSON.parse(json);if(object !=null) {if(objectinstanceofJSONObject) {returngetJsonValue((JSONObject) object, key); }elseif(objectinstanceofJSONArray){return...
getJSONObject(key),key为键名,返回JSONObject对象 getJSONArray(key),key为键名,返回JSONArray对象 实例如下 JSONObject student =newJSONObject();/** put(key,value)其中key是键名,一般为字符串,用于调用后边的value, * value的值为String或JSONObject或JSONArray对象*///put(key,value)添加String对象student.p...
Append an object value. void putByPath(String expression, Object value) 设置表达式指定位置(或filed对应)的值 若表达式指向一个JSONArray则设置其坐标对应位置的值,若指向JSONObject则put对应key的值 注意:如果为JSONArray,设置值下标小于其长度,将替换原有值,否则追加新值 .表达式,可以获取Bean对象中的属性(...
template get<std::string>(); j[1] = 42; bool foo = j.at(2); // comparison j == R"(["foo", 1, true, 1.78])"_json; // true // other stuff j.size(); // 4 entries j.empty(); // false j.type(); // json::value_t::array j.clear(); // the array is empty ...
--json_object和json_array是MaxCompute的内置函数 insert into mf_json_table select json_object("key",123, "value", "abc"); select * from mf_json_table; --返回结果 +---+ | json_val | +---+ | 123 | | {"key":123,"value":"abc"} | +---+ insert into mf_json_table select ...
You can also obtain JSON values by casting values of other types to the JSON type using CAST(value AS JSON); see Converting between JSON and non-JSON values, for more information. Two aggregate functions generating JSON values are available (MySQL 5.7.22 and later). JSON_ARRAYAGG() return...
the location value.toJson public JsonWriter toJson(JsonWriter jsonWriter) Overrides: JsonDataset.toJson(JsonWriter jsonWriter) Parameters: jsonWriter Throws: IOException type public String type() Get the type property: Type of dataset. Overrides: JsonDataset.type() Returns: the type value.val...
OPENJSONtransforms the array of JSON objects into a table in which each object is represented as one row, and key/value pairs are returned as cells. The output observes the following rules: OPENJSONconverts JSON values to the types that are specified in theWITHclause. ...