书接上文：JsonPath实践（一）
本期聊一下如何使用JSonpath标记语法处理，json对象中的数组主要内容是提取数组中对象和对象集合。
json数据
首先看官方给的json数据的Demo（我做了一点点修改）：
JSONObject json = JSON.parseObject("{" +
" "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" +
" }" +
" }," +
" "expensive": 10," +
" "ss": [32,32,4,23]" +
"}");
获取数组中的有序对象
jsonpath：$.store.book[2]
- 这里注意索引是从0开始的。
jsonpath：$.store.book[-1]
- 这里表示倒数第一个对象
代码：
Object read = JsonPath.read(json, "$.store.book[2]");
output(JSON.parseObject(read.toString()));
等效写法：
JSONObject read = JsonPath.read(json, "$.store.book[2]");
output(read);
控制台输出：
INFO-> 当前用户：fv，IP：10.60.131.54，工作目录：/Users/fv/Documents/workspace/fun/,系统编码格式:UTF-8,系统Mac OS X版本:10.15.6
INFO->
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞ {
＞ ① . "author":"Herman Melville",
＞ ① . "price":8.99,
＞ ① . "isbn":"0-553-21311-3",
＞ ① . "category":"fiction",
＞ ① . "title":"Moby Dick"
＞ }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
Process finished with exit code 0
获取数组中的有序对象切片
- 这里的语法类似于
Python中对于数组的处理。
jsonpath：$.store.book[:2]
- 倒数截取
jsonpath：$.store.book[-2:]
代码：
Object read = JsonPath.read(json, "$.store.book[2]");
output(JSON.parseObject(read.toString()));
等效写法省略……
控制台输出：
INFO-> 当前用户：fv，IP：10.60.192.21，工作目录：/Users/fv/Documents/workspace/fun/,系统编码格式:UTF-8,系统Mac OS X版本:10.15.6
INFO->
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞ {
＞ ① . "author":"Nigel Rees",
＞ ① . "price":8.95,
＞ ① . "category":"reference",
＞ ① . "title":"Sayings of the Century"
＞ }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
INFO->
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞ {
＞ ① . "author":"Evelyn Waugh",
＞ ① . "price":12.99,
＞ ① . "category":"fiction",
＞ ① . "title":"Sword of Honour"
＞ }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
Process finished with exit code 0
- 倒数截取
INFO-> 当前用户：fv，IP：10.60.192.21，工作目录：/Users/fv/Documents/workspace/fun/,系统编码格式:UTF-8,系统Mac OS X版本:10.15.6
INFO->
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞ {
＞ ① . "author":"Herman Melville",
＞ ① . "price":8.99,
＞ ① . "isbn":"0-553-21311-3",
＞ ① . "category":"fiction",
＞ ① . "title":"Moby Dick"
＞ }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
INFO->
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞ {
＞ ① . "author":"J. R. R. Tolkien",
＞ ① . "price":22.99,
＞ ① . "isbn":"0-395-19395-8",
＞ ① . "category":"fiction",
＞ ① . "title":"The Lord of the Rings"
＞ }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
Process finished with exit code 0
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