书接上文和上上文以及上上上文：
- JsonPath实践（一）
- JsonPath实践（二）
- JsonPath实践（三）
本期继续将如何处理json数组，主要内容是通过正则过滤json数组中的数据，以及通过正则校验json节点值。
JSonpath中的正则语法是通用的，但是使用方法跟Groovy非常类似。有兴趣的同学参考：Java和Groovy正则使用。使用=~这个标记语法表示正则匹配，然后用前后两个/符号表示正则的内容，这一点跟Groovy一模一样，还有多了一种忽略大小写的语法，就是在正则语句后面的/加上i这个字母（暂时没发现其他字母的标记功能）。
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]"
"}");
通过正则过滤数组
jsonpath：$..book[?(@.author =~ /.*Rees/)]
或者使用路径表示：
jsonpath：$.store.book[?(@.author =~ /.*Rees/)]
- 这里表示倒数第一个对象
代码：
代码语言：javascript复制 Object read = JsonPath.read(json, "$.store.book[?(@.author =~ /.*Rees/)]");
output(JSONArray.parseArray(read.toString()));
等效写法继续省略……
控制台输出：
代码语言：javascript复制INFO-> 当前用户：fv，IP：10.60.192.21，工作目录：/Users/fv/Documents/workspace/fun/,系统编码格式:UTF-8,系统Mac OS X版本:10.15.6
INFO->
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞ {
＞ ① . "author":"Nigel Rees",
＞ ① . "price":8.95,
＞ ① . "category":"reference",
＞ ① . "title":"Sayings of the Century"
＞ }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
Process finished with exit code 0
忽略大小写
jsonpath：$..book[?(@.author =~ /.*REES/)]
或者使用忽略大小写语法：
jsonpath：$.store.book[?(@.author =~ /.*REES/i)]
- 这里表示倒数第一个对象
代码：
代码语言：javascript复制 Object read = JsonPath.read(json, "$.store.book[?(@.author =~ /.*REES/)]");
output(JSONArray.parseArray(read.toString()).isEmpty());
Object read = JsonPath.read(json, "$.store.book[?(@.author =~ /.*Rees/i)]");
output(JSONArray.parseArray(read.toString()));
等效写法继续省略……
控制台输出：
代码语言：javascript复制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-> true
Process finished with exit code 0
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 ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
Process finished with exit code 0
正则验证节点值
- 这个不支持，哈哈，我会封装一下，让它支持。
