意外字符（（）在位置 0

Question

我想从 JSON 文件中获取单个属性及其值，并将其打印在 excel 文件中。 我想从 http 响应方法中获取详细信息，但是我遇到了错误。

Exception in thread "main" Unexpected character (() at position 0.
    at [email protected]/org.json.simple.parser.Yylex.yylex(Unknown Source)
    at [email protected]/org.json.simple.parser.JSONParser.nextToken(Unknown Source)
    at [email protected]/org.json.simple.parser.JSONParser.parse(Unknown Source)
    at [email protected]/org.json.simple.parser.JSONParser.parse(Unknown Source)
    at [email protected]/org.json.simple.parser.JSONParser.parse(Unknown Source)

try {
    HttpResponse<String> response = null;
    response = HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString());
    int statusCode = response.statusCode();
    System.out.println(statusCode);
    System.out.println(response.body());
    JSONObject object = (JSONObject) new JSONParser().parse(jsonString);
    JSONArray users = (JSONArray) object.get("users");
    JSONObject user0 = (JSONObject) users.get(0);
    JSONObject user0data = (JSONObject) user0.get("data");
    String empID = user0data.get("employeeid").toString();
    
    System.out.println("Employee ID: "+empID);
    System.out.println("\n");
}