JsonPath

JsonPath提供的json解析非常強大,非常方便的獲取json的內容.

 

需要的jar網上有!

語法簡介

JsonPath	描述
$	根節點
@	當前節點
.or[]	子節點
..	選擇所有符合條件的節點
*	所有節點
[]	迭代器標示，如數組下標
[,]	支持迭代器中做多選
[start:end:step]	數組切片運算符
?()	支持過濾操作
()	支持表達式計算

 

代碼實例:

{ "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
    }
  }
}

解析代碼:

 //輸出book[0]的author值
        String author = JsonPath.read(json, "$.store.book[0].author");
         System.out.println("author\t"+author);
        //輸出全部author的值，使用Iterator迭代
        List<String> authors = JsonPath.read(json, "$.store.book[*].author");
        System.out.println("authors\t"+authors);
         
        //輸出book[*]中category == 'reference'的book
        List<Object> books = JsonPath.read(json, "$.store.book[?(@.category == 'reference')]");               
        System.out.println("books\t"+books);
        //輸出book[*]中category == 'reference'的book或者
        List<Object> books2 = JsonPath.read(json, "$.store.book[?(@.category == 'reference' || @.price>10)]");               
        System.out.println("books2\t"+books2);
        
        //輸出book[*]中category == 'reference'的book的author 
        List<Object> books1 = JsonPath.read(json, "$.store.book[?(@.category == 'reference')].author");               
        System.out.println("books1\t"+books1);
         
        //輸出book[*]中price>10的book
        List<Object> b1 = JsonPath.read(json, "$.store.book[?(@.price>10)]");
        System.out.println("b1"+b1);
        
        //輸出book[*]中含有isbn元素的book
        List<Object> b2 = JsonPath.read(json, "$.store.book[?(@.isbn)]");
        System.out.println("b2"+b2);
         
        //輸出該json中所有price的值
        List<Double> prices = JsonPath.read(json, "$..price");
        System.out.println("prices"+prices);
        
        //輸出該json中所有title的值
        List<Double> title = JsonPath.read(json, "$..title");
        System.out.println("title"+title);
        //輸出該json中book 0,1的值
        List<Double> book01 = JsonPath.read(json, "$..book[0,1]");
        System.out.println("book01"+book01);
       /* //輸出該json中book 0,1的值
        List<Double> book012 = JsonPath.read(json, "$..book[-2:]");
        System.out.println("book012"+book012);*/
         
        //可以提前編輯一個路徑，並多次使用它
        JsonPath path = JsonPath.compile("$.store.book[*]"); 
        List<Object> b3 = path.read(json); 
        System.out.println("path\t"+path+"\n"+b3);

 

JsonPath 解析比較簡單,使用幾次后就會熟練!