语法:
JsonPath | 描述 |
$ | 根节点 |
@ | 当前节点 |
.or[] | 子节点 |
.. | 选择所有符合条件的节点 |
* | 所有节点 |
[] | 迭代器标示,如数组下标 |
[,] | 支持迭代器中做多选 |
[start:end:step] | 数组切片运算符 |
?() | 支持过滤操作 |
() | 支持表达式计算 |
需要的jar包:
commons-lang-2.6.jarjson-path-0.8.1.jarjson-smart-1.1.1.jar
对于如下的json,通过实例介绍JsonPath的使用
{ "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 } }}
代码:
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 | private static void jsonPathTest() { JSONObject json = jsonTest(); //调用自定义的jsonTest()方法获得json对象,生成上面的json //输出book[0]的author值 String author = JsonPath.read(json, "$.store.book[0].author" ); //输出全部author的值,使用Iterator迭代 List<String> authors = JsonPath.read(json, "$.store.book[*].author" ); //输出book[*]中category == 'reference'的book List<Object> books = JsonPath.read(json, "$.store.book[?(@.category == 'reference')]" ); //输出book[*]中price>10的book List<Object> books = JsonPath.read(json, "$.store.book[?(@.price>10)]" ); //输出book[*]中含有isbn元素的book List<Object> books = JsonPath.read(json, "$.store.book[?(@.isbn)]" ); //输出该json中所有price的值 List<Double> prices = JsonPath.read(json, "$..price" ); //可以提前编辑一个路径,并多次使用它 JsonPath path = JsonPath.compile( "$.store.book[*]" ); List<Object> books = path.read(json); } |