JsonPath 语法 与 XPath 对比

JsonPath 语法 与 XPath 对比

 

XPath	JSONPath	Description
/	$	the root object/element
.	@	the current object/element
/	. or []	child operator
..	n/a	parent operator
//	..	recursive descent. JSONPath borrows this syntax from E4X.
*	*	wildcard. All objects/elements regardless their names.
@	n/a	attribute access. JSON structures don't have attributes.
[]	[]	subscript operator. XPath uses it to iterate over element collections and for predicates. In Javascript and JSON it is the native array operator.
|	[,]	Union operator in XPath results in a combination of node sets. JSONPath allows alternate names or array indices as a set.
n/a	[start:end:step]	array slice operator borrowed from ES4.
[]	?()	applies a filter (script) expression.
n/a	()	script expression, using the underlying script engine.
()	n/a	grouping in Xpath

JSONPath expressions can use the dot–notation

$.store.book[0].title

or the bracket–notation

$['store']['book'][0]['title']

The following XPath expression

/store/book[1]/title

JsonPath would look like

x.store.book[0].title

or

x['store']['book'][0]['title']

JSONPath examples

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

{ "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     }   } }

　　

XPath	JSONPath	Result
/store/book/author	$.store.book[*].author	the authors of all books in the store
//author	$..author	all authors
/store/*	$.store.*	all things in store, which are some books and a red bicycle.
/store//price	$.store..price	the price of everything in the store.
//book[3]	$..book[2]	the third book
//book[last()]	$..book[(@.length-1)] $..book[-1:]	the last book in order.
//book[position()<3]	$..book[0,1] $..book[:2]	the first two books
//book[isbn]	$..book[?(@.isbn)]	filter all books with isbn number
//book[price<10]	$..book[?(@.price<10)]	filter all books cheapier than 10
//*	$..*	all Elements in XML document. All members of JSON structure.

 需要的JAR包

json-path-0.9.1.jar

json-smart-1.2.jar

commons-lang-2.6.jar