递归输出json所有key和value_gson 获取所有key-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_29188567/article/details/130467917

该代码示例展示了如何在Java中使用Gson库递归遍历并打印Json对象的所有键值对，包括嵌套的对象和数组。主要方法是`getAllKeys()`，它处理JsonObject和JsonArray两种情况。

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import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import org.springframework.util.StopWatch;


public class GsonUtils2 {
    private static Gson gson = new Gson();


    public static void main(String[] args) {
        String jsonStr="{\"name\":\"张三\",\"age\":18,\"address\":{\"province\":\"广东省\",\"city\":\"深圳市\",\"district\":\"南山区\"},\"hobbies\":[\"篮球\",\"游泳\",\"旅游\"]}";
        StopWatch sw=new StopWatch();
        sw.start("递归输出json所有key和value");
        JsonObject jsonObject = gson.fromJson(jsonStr, JsonObject.class);
        getAllKeys(jsonObject, "");
        sw.stop();
        System.out.println("总共耗时：" + sw.getTotalTimeMillis() + "ms");
    }

    public static void getAllKeys(JsonObject jsonObject, String parentKey) {
        for (String key : jsonObject.keySet()) {
            JsonElement value = jsonObject.get(key);
            StringBuffer sb=new StringBuffer();
            sb.append(parentKey).append(key).append(".");
            if (value.isJsonObject()) {
                getAllKeys(value.getAsJsonObject(), sb.toString());
            } else if (value.isJsonArray()) {
                getAllKeys(value.getAsJsonArray(), sb.toString());
            } else {
                StringBuffer newSb=new StringBuffer();
                newSb.append(parentKey).append(key).append(":").append(value.getAsString());
                System.out.println(newSb);
            }
        }
    }

    public static void getAllKeys(JsonArray jsonArray, String parentKey) {
        for (int i = 0; i < jsonArray.size(); i++) {
            JsonElement value = jsonArray.get(i);
            StringBuffer sb=new StringBuffer();
            sb.append(parentKey).append("[").append(i).append("]").append(".");
            if (value.isJsonObject()) {
                getAllKeys(value.getAsJsonObject(), sb.toString());
            } else if (value.isJsonArray()) {
                getAllKeys(value.getAsJsonArray(), sb.toString());
            } else {
                StringBuffer newSb=new StringBuffer();
                newSb.append(parentKey).append("[").append(i).append("]").append(":").append(value.getAsString());
                System.out.println(newSb);
            }
        }
    }

}