java - 使用 JSONObject 打印键值未​​按预期工作

Question

我试图打印出下面 JSON 中的所有键值，但无论出于何种原因，它只为我打印了第一组值。

如何打印idValue字符串中的所有键值？

编辑:我现在收到错误:

意外错误:JSONObject["submenu"] 不是字符串。

代码

import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Multimap;
import org.json.JSONArray;
import org.json.JSONObject;

import java.util.Map;

public class testing {
    static Multimap<String, String> allMappedKeyValues = LinkedListMultimap.create();

    public static void main(String[] args) {

        String idValue = "[{\"link\": \"/us_new/en/home\",\"amid\": \"1__home\",\"title\": \"Home\"}, {\"link\": \"/us_new/en/home/diagnosis\",\"amid\": \"2__diagnosis\",\"title\": \"Diagnosis\"}, {\"link\": \"/us_new/en/home/loss\",\"amid\": \"3__loss\",\"title\": \"loss\",\"submenu\": [{\"amid\": \"4__quiz\",\"name\": \"quiz\",\"title\": \"quiz\"},{\"amid\": \"5__questions\",\"name\": \"questions\",\"title\": \"Questions\"}]}]";

        JSONArray array = new JSONArray(idValue);
        for (int i = 0; i < array.length(); i++)
        {
            JSONObject object = array.getJSONObject(i);
            JSONArray keys = object.names();

            for (int j = 0; j < keys.length(); ++j)
            {
                String key = keys.getString(j);
                Object value = object.get(key);

                if (value instanceof JSONArray) {

                    JSONArray array1 = (JSONArray) value;

                    for (int k = 0; k < array1.length(); k++) {
                        JSONObject object1 = array1.getJSONObject(k);

                        JSONArray keys1 = object1.names();

                        String key2 = keys1.getString(k);
                        String value2 = object1.getString(key2);
                        String title2 = object1.getString("title");
//                        System.out.println("-key :" + key2 + "\n-value " + value2 + "\n-title :" + title2);

                        if (key2.contains("amid")) {
                            allMappedKeyValues.put(value2 + "__title", title2);
                        }
                    }
                } else {
                    String key1 = keys.getString(j);
                    String value1 = object.getString(key1);
                    String title1 = object.getString("title");
//                    System.out.println("-key :" + key1 + "\n-value " + value1 + "\n-title :" + title1);

                    if (key.equals("amid")) {
                        allMappedKeyValues.put(value1 + "__title", title1);
                    }
                }
            }
        }

        for (Map.Entry<String, String> entry : allMappedKeyValues.entries()) {
            System.out.println("This is the key-" + entry.getKey() + " value-" + entry.getValue());
        }
    }
}

JSON

[{"link": "/us_new/en/home","amid": "1__home","title": "Home"}, {"link": "/us_new/en/home/diagnosis","amid": "2__diagnosis","title": "Diagnosis"}, {"link": "/us_new/en/home/loss","amid": "3__loss","title": "loss","submenu": [{"amid": "4__quiz","name": "quiz","title": "quiz"},{"amid": "5__questions","name": "questions","title": "Questions"}]}]

输出

  Entered loop :0
-key :link
-value /us_new/en/home
-title :Home
Entered loop :1
-key :amid
-value 1__home
-title :Home
Entered loop :2
-key :title
-value Home
-title :Home

Answer 1

您不需要替换 []，您的 JSON 格式正确。实际上，您可以直接从字符串创建 JSONArray，

String idValue = "[{\"link\":\"/us_new/en/home\",\"amid\":\"1__home\",\"title\":\"Home\"},{\"link\":\"/us_new/en/home/diagnosis\",\"amid\":\"2__diagnosis\",\"title\":\"Diagnosis\"},{\"link\":\"/us_new/en/home/treatment\",\"amid\":\"3__loss\",\"title\":\"loss\"}]";
JSONArray objects = new JSONArray(idValue);
for(int i = 0; i < objects.length(); i++) {
    JSONObject jsonObject = objects.getJSONObject(i);

    Iterator<String> keys = jsonObject.keys();
    while(keys.hasNext()) {
        String key = keys.next();
        System.out.printf("key : %s | value : %s\n", key, jsonObject.get(key));
    }
}

输出:

key : link | value : /us_new/en/home
key : amid | value : 1__home
key : title | value : Home
key : link | value : /us_new/en/home/diagnosis
key : amid | value : 2__diagnosis
key : title | value : Diagnosis
key : link | value : /us_new/en/home/treatment
key : amid | value : 3__loss
key : title | value : loss