JarCastingJsonPath
JsonPath is a Java implementation of the JSONPath specification. Details about the specification can be found at http://goessner.net/articles/JsonPath/. This implementation is designed to mimic the Java Pattern class and it's lifecycle.
A JsonPath expression, specified as a string, must first be compiled into an instance of JsonPath. The resulting instance can then be used to read content from a JSON string. All of the smarts involved in the content reading reside in the JsonPath instance, so content can be read from multiple JSON strings using the same JsonPath instance. Since a JsonPath instance is thread-safe once compiled, multiple threads can use the same shared instance.
A typical invocation is thus:
JsonPath namePath = JsonPath.compile("$.name");
List<String> names = namePath.read("[ { \"name\" : \"foo\" }, { \"name\" : \"bar\" } ]", List.class);
A JsonPath.read(String expression, String json, Class<T> expectedReturnType) method is defined by this class as a convenience for when the JSONPath is used just once. This method compiles an expressions and reads content from a JSON string in a single invocation. The statement:
List<String> names = JsonPath.read("$.name", "[ { \"name\" : \"foo\" }, { \"name\" : \"bar\" } ]", List.class)
is equivalent to the two statements above, though for repeated reads it is less efficient since it does not allow the compiled JSONPath to be reused.
Instances of the JsonPath class are immutable and are safe for use by multiple concurrent threads.
JSONPath Expressions
The following content is adapted from http://goessner.net/articles/JsonPath/
JSONPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination with an XML document. Since a JSON structure is usually anonymous and doesn't necessarily have a "root member object" JSONPath assumes the abstract name $ assigned to the outer level object.
JSONPath expressions can use the dot-notation:
$.store.book[0].title
or the bracket–notation:
$['store']['book'][0]['title']
for input paths. Internal or output paths will always be converted to the more general bracket–notation.
Expressions based on the underlying Jackson JsonNode can be used as an alternative to explicit names or indicies as in:
$.store.book[(@.size() - 1)].title
using the symbol @ for the current object. Filter expressions are supported via the syntax ?(<expression>) as in
$.store.book[?(@.price < 10)].title
Here is a complete overview of the JSONPath syntax:
| Operator | Description |
|---|---|
$ |
Root node. Required as first character of path. |
@ |
Current node. Available in filters and expressions. |
* |
Wildcard. Available anywhere a name or numeric are required. |
.. |
Deep wildcard. Available anywhere a name is required. |
.<name> |
Dot-notated child |
['<name> (, <name>)'] |
Bracket-notated child or children |
[<number> (, <number>)] |
Indexed child or children |
[?(<expression>)] |
Filter expression. Expression must evaluate to a boolean value. |
[(<expression>)] |
Expression. Expression must evaluate to a string or numeric value. |
JSONPath Examples
{
"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,
"style": [ "city", "hybrid" ]
}, {
"color": "blue",
"price": 59.91,
"style": [ "downhill", "freeride" ]
} ]
}
}
| JSONPath | Result |
|---|---|
$.store.book[*].author |
The authors of all books |
$..author |
All authors |
$.store.* |
All things, both books and bicycles |
$.store..price |
The price of everything |
$..book[2] |
The third book |
$..book[(@.length-1)] |
The last book |
$..book[0,1] |
The first two books |
$..book[?(@.isbn)] |
All books with an ISBN number |
$..book[?(@.price<10)] |
All books cheaper than 10 |
$..* |
All JSON nodes |
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