Java&Android遍历JSON文件的数据

import org.json.JSONArray;
import org.json.JSONObject;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

public class JsonFileReader {

    public static void main(String[] args) {
        try {
            String filename = "json.json";
            String hashValue = "-232323298";
            String popupRule = getPopupRuleFromJson(filename, hashValue);
            System.out.println("Popup Rule: " + popupRule);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static String getPopupRuleFromJson(String filename, String hashValue) throws IOException {
        InputStream inputStream = JsonFileReader.class.getClassLoader().getResourceAsStream(filename);
        if (inputStream != null) {
            byte[] buffer = new byte[inputStream.available()];
            inputStream.read(buffer);
            String json = new String(buffer, StandardCharsets.UTF_8);
            JSONArray jsonArray = new JSONArray(json);

            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                if (jsonObject.has(hashValue)) {
                    String popupRulesJson = jsonObject.getString(hashValue);
                    JSONObject popupRulesObject = new JSONObject(popupRulesJson);
                    JSONArray popupRules = popupRulesObject.getJSONArray("popup_rules");
                    if (popupRules.length() > 0) {
                        JSONObject firstPopupRule = popupRules.getJSONObject(0);
                        return firstPopupRule.toString();
                    }
                }
            }
        }
        return null;
    }
}