jsonpath表达式可以使用点或者括号来取值
管方详细介绍:https://goessner.net/articles/JsonPath/
$ :表示根对象
@:表示当前对象
. 或者[]:表示子运算符
():脚本表达式
?():应用过滤器(脚本)表达式
例子如下:
{ "store": {
"book": [
{ "category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{ "category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{ "category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{ "category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
$.store.book[*].author:商店所有书籍的作者(四个作者)
$..author :所有作者
$.store.* :商店所有的东西,包括book和bicycle
$.store..price :所有东西的价格
$..book[2] :第三本书
$..book[0,2]或者$..book[:2]:前两本书
$..book[?(@.isbn)] :用isbn编号过滤所有书籍
$..book[?(@.price<10)] :过滤所有比10更便宜的书
$..* :XML文档中的所有元素