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.jar
json-path-0.8.1.jar
json-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:
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);
}