无法将Json字符串转换为Map<String，Object>

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonToMapExample {
    public static void main(String[] args) {
        String jsonString = "{\"key1\":\"value1\",\"key2\":\"value2\",\"key3\":{\"nestedKey\":\"nestedValue\"}}";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            Map<String, Object> map = objectMapper.readValue(jsonString, new TypeReference<Map<String, Object>>() {});

            // 遍历Map并打印键值对
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}