JsonPath小结

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在查看DHC Assertions 模块说明的时候，无意间发现assert模块中JsonBody使用了 JSON Path ，兴趣使然，看了下，发现是类似解析xml用到的 XPath。通过路径来获取json对象的属性值

JSON Path提供了javascript与PHP版本

XPath表达式：/store/book[1]/title

JSON Path表达式：.store.book[0].title 或则 x[‘store‘][‘book‘][0][‘title‘]

同时，官网也有提到，像javascript、Python、PHP等语言已经提供了类似JSON Path的能力了。

另外，JSON Path存在以下问题

• be naturally based on those language characteristics.
• cover only essential parts of XPath 1.0.
• be lightweight in code size and memory consumption.
• be runtime efficient.

常用的表达式

$.store.book[(@.length-1)].title

using the symbol ‘@‘ for the current object. Filter expressions are supported via the syntax ?(<boolean expr>) as in

$.store.book[?(@.price < 10)].title

{ "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
    }
  }
}

 题外话：在了解JSON Path的时候，还发现了解析JSON的其他框架

传送门：http://blog.sina.com.cn/s/blog_6d425e1a01017sg4.html

JsonSQL、jfunk、TaffyDB、linq.js、objeq

JsonPath小结

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原文地址：http://www.cnblogs.com/draem0507/p/5111002.html