$.store.book[?(@.category=='fiction')].category
表达式1
$.store.book[?(@.category=='fiction')].category
json source
{ "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 } }, "expensive": 10 }
返回
[
"fiction",
"fiction",
"fiction"
]
表达式2
$.store.book[?(@.category=='fiction')].title[1]
返回
[
"w",
"o",
"h"
]
表达式3
返回索引
$.store.book[0]
$.store.book
$.store.book[:]
返回
[ [ { "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 } ] ]
$.store.book[2]
谓词修饰
Inline Predicates
Inline predicates are the ones defined in the path.
List<Map<String, Object>> books = JsonPath.parse(json)
.read("$.store.book[?(@.price < 10)]");
You can use && and || to combine multiple predicates [?(@.price < 10 && @.category == 'fiction')] , [?(@.category == 'reference' || @.price > 10)].
You can use ! to negate a predicate [?(!(@.price < 10 && @.category == 'fiction'))].
表达式5 枚举
$.store.book[?(@.category=='fiction')].author
返回：
[ "Evelyn Waugh", "Herman Melville", "J. R. R. Tolkien" ]
表达式6:作用域修饰
$.store.book[?(@.price < 10 && @.category == 'fiction')]
返回：
[ { "category": "fiction", "author": "Herman Melville", "title": "Moby Dick", "isbn": "0-553-21311-3", "price": 8.99 } ]
$.store.book[?(@.category == 'reference' || @.price > 10)]
返回：
[ { "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": "J. R. R. Tolkien", "title": "The Lord of the Rings", "isbn": "0-395-19395-8", "price": 22.99 } ]
$.store.book[?(!(@.price < 10 && @.category == 'fiction'))]
返回：
[ { "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": "J. R. R. Tolkien", "title": "The Lord of the Rings", "isbn": "0-395-19395-8", "price": 22.99 } ]
price 作用域大于10
作用域！
$.store.book[?((@.price < 10 && @.category == 'fiction'))]
返回：
[ { "category": "fiction", "author": "Herman Melville", "title": "Moby Dick", "isbn": "0-553-21311-3", "price": 8.99 } ]
解析{} 也就是: {子集合
$.[*]
返回：
[ { "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 } }, 10, [ { "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 } ], { "color": "red", "price": 19.95 }, { "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 }, "reference", "Nigel Rees", "Sayings of the Century", 8.95, "fiction", "Evelyn Waugh", "Sword of Honour", 12.99, "fiction", "Herman Melville", "Moby Dick", "0-553-21311-3", 8.99, "fiction", "J. R. R. Tolkien", "The Lord of the Rings", "0-395-19395-8", 22.99, "red", 19.95 ]
解析
$.[*].price
返回
[ 19.95, 8.95, 12.99, 8.99, 22.99 ]
混合表达式：
[?(@.firstname == 'Bob' || @.firstname == 'Jane' && @.surname == 'Smith')]"
拆分{}
$.store.[?(@.color)]
返回>>>:
[ { "color": "red", "price": 19.95 } ]
json通过正则过滤
$..book[?(@.author =~ /.*Melville/i)]
返回表达式:
http://jsonpath.herokuapp.com/?path=$..book[?(@.author =~ /.*REES/i)]
[ { "category" : "fiction", "author" : "Herman Melville", "title" : "Moby Dick", "isbn" : "0-553-21311-3", "price" : 8.99 } ]
$..book[?(@.author =~ /.*/i)]
返回所有node节点
[ { "category" : "reference", "author" : "Nigel Rees", "title" : "Sayings of the Century", "price" : 8.95 }, { "category" : "fiction", "author" : "Evelyn Waugh", "title" : "Sword of Honour", "price" : 12.99 }, { "category" : "fiction", "author" : "Herman Melville", "title" : "Moby Dick", "isbn" : "0-553-21311-3", "price" : 8.99 }, { "category" : "fiction", "author" : "J. R. R. Tolkien", "title" : "The Lord of the Rings", "isbn" : "0-395-19395-8", "price" : 22.99 } ]
特定未节点返回
http://jsonpath.herokuapp.com/?path=$..book[?(@.price =~ /.*99/i)]
$..book[?(@.price =~ /.*99/i)]
[ { "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 } ]
