JsonPath 使用

 

Map<String, String> map ----> $.store.bicycle
String str = $.store.other
List<Map<String, String>> list = $.store.book

{
     "category": "fiction",
     "author": "Evelyn Waugh",
     "title": "Sword of Honour",
     "price": 12.99
  }
Map<String, String> entries = JsonPath.read(str, "$");

JSONPATH Parse JSON array file:

If the object is:
　　[
　　　　[50.4154134372953,-1.28486558931069,"CLASS B",9,205,0,"UK",431500382,3,4],
　　　　[50.3058858494047,-0.976070494820637,"CLASS B",9,239,0,"UK",2750350,21,2]
　　]
Then "$[0]" will return:
[50.4154134372953,-1.28486558931069,"CLASS B",9,205,0,"UK",431500382,3,4] 

And "$[1]" will return:
[50.3058858494047,-0.976070494820637,"CLASS B",9,239,0,"UK",2750350,21,2] 

You can do it two levels deep as well. "$[0][4]" will return:
205

You can also extract the elements of the array into a list with "$[*]", which will return a list of 2 elements. The first being:
[50.4154134372953,-1.28486558931069,"CLASS B",9,205,0,"UK",431500382,3,4]
and the second being:
[50.3058858494047,-0.976070494820637,"CLASS B",9,239,0,"UK",2750350,21,2]

{
    "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
        }        "other":"[{"filterable":"true","dataIndex":"DateValue","dataType":"date","isInStandardView":"true","sortAsConverterFormat":"yyyyMMdd","id":"DateValue","sortable":"true","isVisible":"true"},{"filterable":"true","dataIndex":"DateType","dataType":"string","isInStandardView":"true","sortAsConverterFormat":null,"id":"DateType","sortable":"true","isVisible":"true"}]"
    },
    "expensive": 10
}

{ "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
    }
  }
}

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); 
}