JsonPath实践（六）

时间:2022-07-24
本文章向大家介绍JsonPath实践（六），主要内容包括其使用实例、应用技巧、基本知识点总结和需要注意事项，具有一定的参考价值，需要的朋友可以参考一下。

之前分享了jsonpath的部分API使用，基本已经把基础的内容讲完了，今天分享一下JsonPath API中的函数的使用方法，其实之前讲到的一些json数组的过滤中已经用到了一些函数，大概是因为功能不一样吧，这里将的函数都是处理json数组的，而不是过滤数组的条件。

json数据

在原来的数据基础上增加了部分字段和部分节点。

JSONObject json = JSON.parseObject("{" +
                "    "store": {" +
                "        "book": [" +
                "            {" +
                "                "category": "reference"," +
                "                "author": "Nigel Rees"," +
                "                "title": "Sayings of the Century"," +
                "                "page": "D"," +
                "                "pages": ["S","X","G"]," +
                "                "price": 8.95" +
                "            }," +
                "            {" +
                "                "category": "fiction"," +
                "                "author": "Evelyn Waugh"," +
                "                "title": "Sword of Honour"," +
                "                "page": "A"," +
                "                "pages": ["A","B"]," +
                "                "price": 12.99" +
                "            }," +
                "            {" +
                "                "category": "fiction"," +
                "                "author": "Herman Melville"," +
                "                "title": "Moby Dick"," +
                "                "isbn": "0-553-21311-3"," +
                "                "page": "B"," +
                "                "pages": ["E","F"]," +
                "                "price": 8.99" +
                "            }," +
                "            {" +
                "                "category": "fiction"," +
                "                "author": "J. R. R. Tolkien"," +
                "                "title": "The Lord of the Rings"," +
                "                "isbn": "0-395-19395-8"," +
                "                "page": "C"," +
                "                "pages": ["C","D"]," +
                "                "price": 22.99" +
                "            }" +
                "        ]," +
                "        "bicycle": {" +
                "            "color": "red"," +
                "            "price": 19.95" +
                "        }" +
                "    }," +
                "    "expensive": 10," +
                "    "ss": [32,32,4,23]" +
                "}");

获取数组最小值

jsonpath：$.ss.min()

代码：

        Object read = JsonPath.read(json, "$.ss.min()");
        output(read);

等效写法继续省略……

控制台输出：

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-> 4.0

Process finished with exit code 0
  • 这里需要注意，该方法返回值是一个double的数值，测试中用的int整型，但是结果返回的是4.0。

获取数组的最大值

jsonpath：$.ss.max()

代码：

        Object read = JsonPath.read(json, "$.ss.max()");
        output(read);

等效写法继续省略……

控制台输出：

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-> 32.0

Process finished with exit code 0
  • 同样的，max函数返回的也是double浮点型数据。

获取数组的平均值

jsonpath：$.ss.avg()

代码：

        Object read = JsonPath.read(json, "$.ss.avg()");
        output(read);

等效写法继续省略……

控制台输出：

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-> 22.75

Process finished with exit code 0
  • 同样的，max函数返回的也是double浮点型数据。

获取数组的标准差

jsonpath：$.ss.stddev()

代码：

        Object read = JsonPath.read(json, "$.ss.stddev()");
        output(read);

等效写法继续省略……

控制台输出：

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-> 11.431863365173676

Process finished with exit code 0
  • 同样的，stddev函数返回的也是double浮点型数据。

获取数组的长度

  • 对于json数组适用。

jsonpath：$.ss.length()

jsonpath：$.store.book.length()

代码：

        Object read = JsonPath.read(json, "$.ss.length()");
        output(read);

        Object read = JsonPath.read(json, "$.store.book.length()");
        output(read);

等效写法继续省略……

控制台输出：

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-> 4

Process finished with exit code 0

求数组的和

jsonpath：$.ss.sum()

代码：

        Object read = JsonPath.read(json, "$.ss.sum()");
        output(read);

等效写法继续省略……

控制台输出：

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-> 91.0

Process finished with exit code 0
  • 同样的，sun函数返回的也是double浮点型数据。

自此，JsonPath API系列已经更完了，我在积极准备JsonPath util的内容，使用Groovy的Groovy重载操作符（终极版）功能，敬请期待。

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