如何从具有 JSON 对象的数组列表中获取键的值

问题描述

List<String>ownerLst= new ArrayList<String>();
ownerLst= Util.extractListFromresponse(apiResponse,"","owner");

public static List <String>extractListFromresponse(Response apiResponse,String keyToMatch,String valuetoMatch,String getValueOfKey) {
        List<String> currLst = new ArrayList<String>();
        JSONObject json;
        try {
            json = (JSONObject) parser.parse(apiResponse.asstring());
            String str;
            if (keyToMatch == "" && valuetoMatch == "") {
                str = "$..results[*]." + getValueOfKey.trim();
            } else {
                str = "$..results[?(@." + keyToMatch.trim() + "==\'" + valuetoMatch.trim() + "\')]."
                        + getValueOfKey.trim() + "";
            }
            
            currLst = JsonPath.read(json,str);
            logger.info("extractListFromresponse - Current List: " + currLst);
        } catch (ParseException e) {
            // Todo Auto-generated catch block
            e.printstacktrace();
        }
        return currLst;
    }

currLst 返回 this- [{"firstname":"xxx","inactive":false] // 一个 JSON 对象

所以，ownerLst 有 [{"firstname":"xxx","inactive":false] // 一个 JSON 对象

现在，我想获取键“firstname”的值（“xxx”）。我该怎么做？

解决方法

试试下面的代码片段：

 JSONParser jp = new JSONParser();
    Object object = jp.parse("[{\"firstname\":\"xxx\",\"inactive\":false}]");
    List<JSONObject> objects=null;
    if ( object instanceof JSONArray) {
         objects = (JSONArray) object;
    }

    for ( JSONObject jsonObject :  objects)
     {
         Object name =  jsonObject.get("firstname");
         System.out.println(name);
     }