JsonPath | 易学教程

JsonPath提供的json解析非常强大,非常方便的获取json的内容.

需要的jar网上有!

语法简介

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

代码实例:

 1 { "store": {
 2     "book": [ 
 3       { "category": "reference",
 4         "author": "Nigel Rees",
 5         "title": "Sayings of the Century",
 6         "price": 8.95
 7       },
 8       { "category": "fiction",
 9         "author": "Evelyn Waugh",
10         "title": "Sword of Honour",
11         "price": 12.99,
12         "isbn": "0-553-21311-3"
13       }
14     ],
15     "bicycle": {
16       "color": "red",
17       "price": 19.95
18     }
19   }
20 }

解析代码:

 1  //输出book[0]的author值
 2         String author = JsonPath.read(json, "$.store.book[0].author");
 3          System.out.println("author\t"+author);
 4         //输出全部author的值，使用Iterator迭代
 5         List<String> authors = JsonPath.read(json, "$.store.book[*].author");
 6         System.out.println("authors\t"+authors);
 7          
 8         //输出book[*]中category == 'reference'的book
 9         List<Object> books = JsonPath.read(json, "$.store.book[?(@.category == 'reference')]");               
10         System.out.println("books\t"+books);
11         //输出book[*]中category == 'reference'的book或者
12         List<Object> books2 = JsonPath.read(json, "$.store.book[?(@.category == 'reference' || @.price>10)]");               
13         System.out.println("books2\t"+books2);
14         
15         //输出book[*]中category == 'reference'的book的author 
16         List<Object> books1 = JsonPath.read(json, "$.store.book[?(@.category == 'reference')].author");               
17         System.out.println("books1\t"+books1);
18          
19         //输出book[*]中price>10的book
20         List<Object> b1 = JsonPath.read(json, "$.store.book[?(@.price>10)]");
21         System.out.println("b1"+b1);
22         
23         //输出book[*]中含有isbn元素的book
24         List<Object> b2 = JsonPath.read(json, "$.store.book[?(@.isbn)]");
25         System.out.println("b2"+b2);
26          
27         //输出该json中所有price的值
28         List<Double> prices = JsonPath.read(json, "$..price");
29         System.out.println("prices"+prices);
30         
31         //输出该json中所有title的值
32         List<Double> title = JsonPath.read(json, "$..title");
33         System.out.println("title"+title);
34         //输出该json中book 0,1的值
35         List<Double> book01 = JsonPath.read(json, "$..book[0,1]");
36         System.out.println("book01"+book01);
37        /* //输出该json中book 0,1的值
38         List<Double> book012 = JsonPath.read(json, "$..book[-2:]");
39         System.out.println("book012"+book012);*/
40          
41         //可以提前编辑一个路径，并多次使用它
42         JsonPath path = JsonPath.compile("$.store.book[*]"); 
43         List<Object> b3 = path.read(json); 
44         System.out.println("path\t"+path+"\n"+b3);

JsonPath 解析比较简单,使用几次后就会熟练!

来源：https://www.cnblogs.com/fyqx/p/6832473.html

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jsonpath