JsonPath 解析Josn字符串

本文仅是测试验证使用jsonPath的功能，演示如何使用，详细的介绍可参考GitHub。

测试第一步安装jsonPath:

C:\>pip install Jsonpath

Collecting Jsonpath

Downloading jsonpath-0.82.tar.gz (9.6 kB)

Preparing metadata (setup.py) … done

Using legacy ‘setup.py install’ for Jsonpath, since package ‘wheel’ is not installed.

Installing collected packages: Jsonpath

Running setup.py install for Jsonpath … done

Successfully installed Jsonpath-0.82

https://github.com/json-path/JsonPath

第2步创建用于测试的json文件，依据GitHub示例，稍作修改的测试Json文件如下：

{“store”: {

“book”: [

{“category”: “编程”,

“author”: “Dinnes”,

“title”: “C#高级编程”,

“price”: 99.95

{“category”: “编程”,

“author”: “Ritchie”,

“title”: “WPF编程宝典”,

“price”: 12.99

{“category”: “编程”,

“author”: “Jeff”,

“title”: “Python爬虫”,

“isbn”: “0-553-21311-3”,

“price”: 78.99

{“category”: “编程”,

“author”: “Jack”,

“title”: “Python数据分析”,

“isbn”: “0-395-19395-8”,

“price”: 89.99

}

“bicycle”: {

“author”: “法拉利”,

“color”: “黑色”,

“price”: 1999.95

}

文件名为Demo.json

第3步测试功能：

导入库

import json

import jsonpath

jsObj = json.load(open(“Demo.json”, “r”, encoding=‘utf-8’))

测试1：获取所有书的作者

authors = jsonpath.jsonpath(jsObj, ‘$.store.book[*].author’)

print(authors)

输出：

[‘Dinnes’, ‘Ritchie’, ‘Jeff’, ‘Jack’]

测试2：获取所有的作者，任何包含作者的元素

authors = jsonpath.jsonpath(jsObj, ‘$…author’)

print(authors)

输出：

[‘Dinnes’, ‘Ritchie’, ‘Jeff’, ‘Jack’, ‘法拉利’]

测试3：获取store 下面的所有元素

all_elements = jsonpath.jsonpath(jsObj, ‘$.store.*’)

print(all_elements)

输出：

[[{‘category’: ‘编程’, ‘author’: ‘Dinnes’, ‘title’: ‘C#高级编程’, ‘price’: 99.95}, {‘category’: ‘编程’, ‘author’: ‘Ritchie’, ‘title’: ‘WPF编程宝典’, ‘price’: 12.99}, {‘category’: ‘编程’, ‘author’: ‘Jeff’, ‘title’: ‘Python爬虫’, ‘isbn’: ‘0-553-21311-3’, ‘price’: 78.99}, {‘category’: ‘编程’, ‘author’: ‘Jack’, ‘title’: ‘Python数据分析’, ‘isbn’: ‘0-395-19395-8’, ‘price’: 89.99}], {‘author’: ‘法拉利’, ‘color’: ‘黑色’, ‘price’: 1999.95}]

测试4：获取store 节点下所有商品的价格

all_prices = jsonpath.jsonpath(jsObj, ‘$.store…price’)

print(all_prices)

输出：

[99.95, 12.99, 78.99, 89.99, 1999.95]

测试5：获取第3本书的所有元素

book = jsonpath.jsonpath(jsObj, ‘$…book[2]’)

print(book)

输出：

[{‘category’: ‘编程’, ‘author’: ‘Jeff’, ‘title’: ‘Python爬虫’, ‘isbn’: ‘0-553-21311-3’, ‘price’: 78.99}]

测试6：获取最后一本书的所有元素

last_book = jsonpath.jsonpath(jsObj, ‘$…book[(@.length-1)]’)

print(last_book)

输出：

[{‘category’: ‘编程’, ‘author’: ‘Jack’, ‘title’: ‘Python数据分析’, ‘isbn’: ‘0-395-19395-8’, ‘price’: 89.99}]

测试7：获取前2本书的所有元素

# b_list = jsonpath.jsonpath(jsObj, ‘$…book[0,1]’) 或者

b_list = jsonpath.jsonpath(jsObj, ‘$…book[0:2]’)

print(b_list)

输出：

[{‘category’: ‘编程’, ‘author’: ‘Dinnes’, ‘title’: ‘C#高级编程’, ‘price’: 99.95}, {‘category’: ‘编程’, ‘author’: ‘Ritchie’, ‘title’: ‘WPF编程宝典’, ‘price’: 12.99}]

测试8：获取包含属性ISBN的元素，即属性过滤

b_isbn = jsonpath.jsonpath(jsObj, ‘$…book[?(@.isbn)]’)

print(b_isbn)

输出：

[{‘category’: ‘编程’, ‘author’: ‘Jeff’, ‘title’: ‘Python爬虫’, ‘isbn’: ‘0-553-21311-3’, ‘price’: 78.99}, {‘category’: ‘编程’, ‘author’: ‘Jack’, ‘title’: ‘Python数据分析’, ‘isbn’: ‘0-395-19395-8’, ‘price’: 89.99}]

测试9：价格过滤

选取价格大于90的元素

b_P = jsonpath.jsonpath(jsObj, ‘$…book[?(@.price >90)]’)

print(b_P)

输出：

[{‘category’: ‘编程’, ‘author’: ‘Dinnes’, ‘title’: ‘C#高级编程’, ‘price’: 99.95}]