JsonPath解析Json数据 JsonPath解析Json数据

JsonPath to JSON is what XPATH is to XML, a simple way to extract parts of a given document. JsonPath is available in many programming languages such as Javascript, Python and PHP. Now also in Java!

Given:
{ "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,
"isbn": "0-553-21311-3"
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
}

Read

All authors:

List authors = JsonPath.read(json, "$.store.book[*].author");

Author of first book in store:

String author = JsonPath.read(json, "$.store.book[1].author");

All books with category = "reference"

List books = JsonPath.read(json, "$.store.book[?(@.category == 'reference')]");

List books = JsonPath.read(json, "$.store.book[?]", filter(where("category").is("reference")));

All books that cost more than 10 USD

List books = JsonPath.read(json, "$.store.book[?(@.price > 10)]");

List books = JsonPath.read(json, "$.store.book[?]", filter(where("price").gt(10)));

All books that have isbn

List books = JsonPath.read(json, "$.store.book[?(@.isbn)]");

List books = JsonPath.read(json, "$.store.book[?]", filter(where("isbn").exists(true)));

Chained filters

Filter filter = Filter.filter(Criteria.where("isbn").exists(true).and("category").in("fiction", "reference"))

List books = JsonPath.read(json, "$.store.book[?]", filter);

Custom filters

Filter myFilter = new Filter.FilterAdapter>(){
@Override
public boolean accept(Map map) {
return map.containsKey("isbn");
}
};

List books = JsonPath.read(json, "$.store.book[?]", myFilter);

All prices in the document

List prices = JsonPath.read(json, "$..price");

Compiled path

You can pre compile a path and use it multiple times

JsonPath path = JsonPath.compile("$.store.book[*]");

List books = path.read(json);

Assert

Asserts are made with Hamcrest matchers

JsonAssert.with(json).assertThat("$.store.bicycle.color", Matchers.equalTo("red"))
.assertThat("$.store.bicycle.price", Matchers.equalTo(19.95D));

Add some static imports and you get this

with(json).assertThat("$.store.bicycle.color", equalTo("red"))
.assertThat("$.store.bicycle.price", equalTo(19.95D));

The Hamcrest library contains a lot of different matchers and they can often be nested.

with(json).assertThat("$..author", hasItems("Nigel Rees", "Evelyn Waugh"))
.assertThat("$..author", is(collectionWithSize(equalTo(2))));

with(json).assertThat("$.store.book[?(@.category == 'x')]", emptyCollection());

If you don't find the matcher you need, roll your own.
Download

Json-path is available at Maven Central，add below dependency into pom.xml :
【JsonPath解析Json数据】

文章图片

JsonPath解析Json数据

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