如何检查字符串是否在JSON文件中并获取字符串的入口号

import json

def find_string_in_json(json_data, target_string, current_path=""):
    if isinstance(json_data, dict):
        for key, value in json_data.items():
            new_path = f"{current_path}.{key}" if current_path else key
            if isinstance(value, str) and value == target_string:
                print(f"目标字符串 '{target_string}' 存在于路径：{new_path}")
            elif isinstance(value, (dict, list)):
                find_string_in_json(value, target_string, new_path)
    elif isinstance(json_data, list):
        for index, value in enumerate(json_data):
            new_path = f"{current_path}[{index}]"
            if isinstance(value, str) and value == target_string:
                print(f"目标字符串 '{target_string}' 存在于路径：{new_path}")
            elif isinstance(value, (dict, list)):
                find_string_in_json(value, target_string, new_path)

# 读取JSON文件
with open('example.json') as file:
    json_data = json.load(file)

# 检查字符串是否存在并获取入口号
target_string = "目标字符串"
find_string_in_json(json_data, target_string)