HashMap嵌套对象的GSON Json映射

import com.google.gson.Gson;

public class Main {
    public static void main(String[] args) {
        // 创建包含嵌套HashMap对象的Java对象
        HashMap<String, Object> nestedHashMap = new HashMap<>();
        nestedHashMap.put("key1", "value1");
        nestedHashMap.put("key2", "value2");

        HashMap<String, Object> parentHashMap = new HashMap<>();
        parentHashMap.put("nestedHashMap", nestedHashMap);

        // 将Java对象转换为Json字符串
        Gson gson = new Gson();
        String json = gson.toJson(parentHashMap);
        System.out.println(json);
    }
}

import com.google.gson.Gson;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        String json = "{\"nestedHashMap\":{\"key1\":\"value1\",\"key2\":\"value2\"}}";

        // 将Json字符串转换为Java对象
        Gson gson = new Gson();
        Map<String, Object> parentHashMap = gson.fromJson(json, Map.class);

        // 输出转换后的Java对象
        System.out.println(parentHashMap);
    }
}