python从文件中读取json串，按字段单独成行解析

 

# -*- coding: UTF-8 -*-

import json


def input_json_data_from_file(path):
    """
    从文件中获取json数据
    :param path: 文件路径
    :return json_data: 返回转换为json格式后的json数据
    """
    try:
        with open(path, 'r+') as f:
            try:
                json_data = json.load(f)
            except Exception as e:
                print('json数据格式不正确：' + str(e))
        return json_data
    except Exception as e:
        print('文件不存在：' + str(e))


def analyze_json(jsons):
    """
    解析传进来的jsons,将jsons解析成key-value并输出
    :param jsons: 需要解析的json字符串
    :return:
    """
    # json_data = json.loads(jsons)
    # if isinstance(json_data, dict):
    # isinstance函数是Python的内部函数，他的作用是判断jsons这个参数是否为dict类型
    # 如果是的话返回True，否则返回False
    if isinstance(jsons, dict):
        for key in jsons.keys():
            key_value = jsons.get(key)
            if isinstance(key_value, dict):
                analyze_json(key_value)
            elif isinstance(key_value, list):
                for json_array in key_value:
                    analyze_json(json_array)
            else:
                print(str(key) + " = " + str(key_value))
    elif isinstance(jsons, list):
        for json_array in jsons:
            analyze_json(json_array)
    else:
        print('请输入正确的json数据')


def output_value(jsons, key):
    """
    通过参数key，在jsons中进行匹配并输出该key对应的value
    :param jsons: 需要解析的json串
    :param key: 需要查找的key
    :return:
    """
    key_value = ''
    if isinstance(jsons, dict):
        for json_result in jsons.values():
            if key in jsons.keys():
                key_value = jsons.get(key)
            else:
                output_value(json_result, key)
    elif isinstance(jsons, list):
        for json_array in jsons:
            output_value(json_array, key)
    if key_value != '':
        print(str(key) + " = " + str(key_value))


def main(path):
    json_data = input_json_data_from_file(path)
    print('原始数据：' + str(json_data))

    print('……………………………………调用解析……………………………………')
    # 调用解析
    print('将jsons1解析后的结果如下：')
    analyze_json(json_data)

    print('……………………………………调用查找……………………………………')
    # 调用查找
    print('查找jsons1中t2key的value值如下：')
    output_value(json_data, "orderId")
    print('……………………………………运行结束……………………………………')


if __name__ == '__main__':
    main(r"../test_data/json_data.txt")

参考：https://blog.csdn.net/songlh1234/article/details/82690948