Java JSONObject和JSONArray

首先，我英语说得不好，请理解

我使用JAVA和“总线到达系统API”，但我有一个问题

如果只有一条总线将到达，“item”是一个JSONObject

但如果有超过2辆巴士将到达，“项目”是一个JSONArray。

反正我也不知道。。。如果有什么想法，请帮助我。。 多谢各位

这是我的密码

@Override
public void initialize(URL arg0, ResourceBundle arg1) {
    no1.setText(""); no2.setText(""); no3.setText(""); no4.setText(""); no5.setText(""); no6.setText(""); no7.setText(""); no8.setText("");
    info1.setText(""); info2.setText(""); info3.setText(""); info4.setText(""); info5.setText("");  info6.setText("");  info7.setText("");  info8.setText("");  
    station1.setText(""); station2.setText(""); station3.setText(""); station4.setText(""); station5.setText(""); station6.setText(""); station7.setText(""); station8.setText(""); 
    time1.setText(""); time2.setText(""); time3.setText(""); time4.setText(""); time5.setText(""); time6.setText(""); time7.setText(""); time8.setText("");
}

private ArrayList<String> arrstation = new ArrayList<>();
private ArrayList<String> arrtime = new ArrayList<>();
private ArrayList<String> busno = new ArrayList<>();
private ArrayList<String> businfo = new ArrayList<>();
private ArrayList<Integer> intarrtime = new ArrayList<>();

public void Bus(){
    try{

        StringBuilder urlBuilder = new StringBuilder("http://openapi.tago.go.kr/openapi/service/ArvlInfoInqireService/getSttnAcctoArvlPrearngeInfoList"); /*URL*/
        urlBuilder.append("?" + URLEncoder.encode("ServiceKey","UTF-8") + "=Tcit3Up%2FxLhDOivx1nH8pb9%2FJB1g44Wy7OC1pISvRlUCt2fnnPJyD0si1jFkvjlYXaixwMD%2BVV5j76M8i%2BEpuA%3D%3D"); /*Service Key*/
        urlBuilder.append("&" + URLEncoder.encode("cityCode","UTF-8") + "=" + URLEncoder.encode("32010", "UTF-8")); /*도시코드*/
        urlBuilder.append("&" + URLEncoder.encode("nodeId","UTF-8") + "=" + URLEncoder.encode("CCB250001349", "UTF-8")); /*정류소ID*/
        urlBuilder.append("&" + URLEncoder.encode("_type", "UTF-8") + "=" + URLEncoder.encode("json", "UTF-8"));
        URL url = new URL(urlBuilder.toString());
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setRequestProperty("Content-type", "application/json");
        System.out.println("Response code: " + conn.getResponseCode());
        BufferedReader rd;
        if(conn.getResponseCode() >= 200 && conn.getResponseCode() <= 300) {
            rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        } else {
            rd = new BufferedReader(new InputStreamReader(conn.getErrorStream()));
        }
        String result = new String();
        String line;
        while ((line = rd.readLine()) != null) {
            result=result.concat(line);
        }
        System.out.println(result);

        JSONParser jsonParser = new JSONParser();
        JSONObject jsonObj = (JSONObject) jsonParser.parse(result);
        System.out.println("parsing start");

        JSONObject response = (JSONObject) jsonObj.get("response");

        JSONObject body = (JSONObject) response.get("body");

        JSONObject items = (JSONObject) body.get("items");

        JSONArray itemArray = (JSONArray) items.get("item");


        JSONObject item_array[] = new JSONObject[10];


        for(int i=0; i<=8; i++){
            item_array[i] = (JSONObject) itemArray.get(i);

            busno.add(item_array[i].get("routeno").toString());

            businfo.add(item_array[i].get("routetp").toString());
            arrtime.add(item_array[i].get("arrtime").toString());
            arrstation.add(item_array[i].get("arrprevstationcnt").toString());
            intarrtime.add(Integer.parseInt(arrtime.get(i))/60);
        }

        rd.close();
        conn.disconnect();


    }catch(Exception e){
        System.out.println(e.getMessage());
    }

    }

public void setBusLabel(ArrayList<String> busno, ArrayList<String> businfo, ArrayList<Integer> intarrtime, ArrayList<String> arrstation) {
    no1.setText(busno.get(0)); no2.setText(busno.get(1)); no3.setText(busno.get(2)); no4.setText(busno.get(3)); no5.setText(busno.get(4)); no6.setText(busno.get(5)); no7.setText(busno.get(6)); no8.setText(busno.get(7));
    info1.setText(businfo.get(0)); info2.setText(businfo.get(1)); info3.setText(businfo.get(2)); info4.setText(businfo.get(3)); info5.setText(businfo.get(4));  info6.setText(businfo.get(5));  info7.setText(businfo.get(6));  info8.setText(businfo.get(7));  
    /*
    time1.setText(intarrtime[0].toString()+"분"); time2.setText(intarrtime[1].toString()+"분"); time3.setText(intarrtime[2].toString()+"분"); time4.setText(intarrtime[3].toString()+"분"); time5.setText(intarrtime[4].toString()+"분"); time6.setText(intarrtime[5].toString()+"분"); time7.setText(intarrtime[6].toString()+"분"); time8.setText(intarrtime[7].toString()+"분");
    station1.setText(arrstation[0]); station2.setText(arrstation[1]); station3.setText(arrstation[2]); station4.setText(arrstation[3]); station5.setText(arrstation[4]); station6.setText(arrstation[5]);   station7.setText(arrstation[6]); station8.setText(arrstation[7] 
    */
}

public ArrayList<String> getArrstation() {
    return arrstation;
}

public void setArrstation1(ArrayList<String> arrstation) {
    this.arrstation = arrstation;
}

public ArrayList<String> getBusno() {
    return busno;
}

public void setBusno1(ArrayList<String> busno) {
    this.busno = busno;
}

public ArrayList<String> getBusinfo() {
    return businfo;
}

public void setBusinfo1(ArrayList<String> businfo) {
    this.businfo = businfo;
}

public ArrayList<Integer> getIntarrtime() {
    return intarrtime;
}

public void setIntarrtime(ArrayList<Integer> intarrtime) {
    this.intarrtime = intarrtime;
}   

}

@覆盖
公共void初始化（URL arg0，ResourceBundle arg1）{
no1.setText（“”）；no2.setText（“”）；no3.setText（“”）；no4.setText（“”）；no5.setText（“”）；no6.setText（“”）；no7.setText（“”）；no8.setText（“”）；
info1.setText（“”）；info2.setText（“”）；info3.setText（“”）；info4.setText（“”）；info5.setText（“”）；info6.setText（“”）；info7.setText（“”）；info8.setText（“”）；
station1.setText（“”）；station2.setText（“”）；station3.setText（“”）；station4.setText（“”）；station5.setText（“”）；station6.setText（“”）；station7.setText（“”）；station8.setText（“”）；
time1.setText（“”）；time2.setText（“”）；time3.setText（“”）；time4.setText（“”）；time5.setText（“”）；time6.setText（“”）；time7.setText（“”）；time8.setText（“”）；
}
private ArrayList arrstation=new ArrayList（）；
private ArrayList arrtime=new ArrayList（）；
private ArrayList busno=new ArrayList（）；
private ArrayList businfo=new ArrayList（）；
private ArrayList intarrtime=new ArrayList（）；
公共巴士（）{
试一试{
StringBuilder urlBuilder=新的StringBuilder（“http://openapi.tago.go.kr/openapi/service/ArvlInfoInqireService/getSttnAcctoArvlPrearngeInfoList“”；/*URL*/
urlBuilder.append（“？”+URLEncoder.encode（“ServiceKey”，“UTF-8”）+”=Tcit3Up%2FxLhDOivx1nH8pb9%2FJB1g44Wy7OC1pISvRlUCt2fnnPJyD0si1jFkvjlYXaixwMD%2BVVV5J76M8I%2BEpuA%3D%3D”）；/*服务密钥*/
urlBuilder.append（“&”+urlcoder.encode（“cityCode”，“UTF-8”）+“=”+urlcoder.encode（“32010”，“UTF-8”））/*도시코드*/
urlBuilder.append（“&”+urlcoder.encode（“nodeId”，“UTF-8”）+“=”+urlcoder.encode（“CCB250001349”，“UTF-8”））/*정류소身份证*/
urlBuilder.append（“&”+URLEncoder.encode（“_-type”，“UTF-8”）+“=”+URLEncoder.encode（“json”，“UTF-8”））；
URL=新URL（urlBuilder.toString（））；
HttpURLConnection conn=（HttpURLConnection）url.openConnection（）；
conn.setRequestMethod（“GET”）；
conn.setRequestProperty（“内容类型”、“应用程序/json”）；
System.out.println（“响应代码：+conn.getResponseCode（））；
BufferedReader路；
如果（conn.getResponseCode（）>=200&&conn.getResponseCode（）尽管服务中可能存在设计缺陷，但您可以使用instanceOf：

好的，您可以通过
instanceof
进行检查，例如
对象itemObj=items.get（“item”）；if（itemObj instanceof JSONObject）{…}
。但是，我个人不会以如此笨拙的方式设计api，也就是说，我可能总是使用数组/列表，即使它只包含一个元素。
Object obj = items.get("item");

if( obj instanceOf JSONArray )
{

   //treat as JSONArray
}
else if(obj instanceOf JSONObject)
{

   //treat as JSONObject
}