JsonPath实践（二）

时间:2022-07-23
本文章向大家介绍JsonPath实践（二），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。

本期接一下如何使用JSonpath标记语法处理，json对象中的数组主要内容是提取数组中对象和对象集合。

json数据

首先看官方给的json数据的Demo（我做了一点点修改）：

JSONObject json = JSON.parseObject("{" +
                "    "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" +
                "        }" +
                "    }," +
                "    "expensive": 10," +
                "    "ss": [32,32,4,23]" +
                "}");

获取数组中的有序对象

jsonpath：$.store.book[2]

  • 这里注意索引是从0开始的。

jsonpath：$.store.book[-1]

  • 这里表示倒数第一个对象

代码：

        Object read = JsonPath.read(json, "$.store.book[2]");
        output(JSON.parseObject(read.toString()));

等效写法：

        JSONObject read = JsonPath.read(json, "$.store.book[2]");
        output(read);

控制台输出：

INFO-> 当前用户：fv，IP：10.60.131.54，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-> 
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞  {
＞  ① . "author":"Herman Melville",
＞  ① . "price":8.99,
＞  ① . "isbn":"0-553-21311-3",
＞  ① . "category":"fiction",
＞  ① . "title":"Moby Dick"
＞  }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~

Process finished with exit code 0

获取数组中的有序对象切片

  • 这里的语法类似于Python中对于数组的处理。

jsonpath：$.store.book[:2]

  • 倒数截取

jsonpath：$.store.book[-2:]

代码：

        Object read = JsonPath.read(json, "$.store.book[2]");
        output(JSON.parseObject(read.toString()));

等效写法省略……

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-> 
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞  {
＞  ① . "author":"Nigel Rees",
＞  ① . "price":8.95,
＞  ① . "category":"reference",
＞  ① . "title":"Sayings of the Century"
＞  }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
INFO-> 
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞  {
＞  ① . "author":"Evelyn Waugh",
＞  ① . "price":12.99,
＞  ① . "category":"fiction",
＞  ① . "title":"Sword of Honour"
＞  }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~

Process finished with exit code 0
  • 倒数截取

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-> 
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞  {
＞  ① . "author":"Herman Melville",
＞  ① . "price":8.99,
＞  ① . "isbn":"0-553-21311-3",
＞  ① . "category":"fiction",
＞  ① . "title":"Moby Dick"
＞  }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
INFO-> 
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~
＞  {
＞  ① . "author":"J. R. R. Tolkien",
＞  ① . "price":22.99,
＞  ① . "isbn":"0-395-19395-8",
＞  ① . "category":"fiction",
＞  ① . "title":"The Lord of the Rings"
＞  }
~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~ JSON ~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~~☢~

Process finished with exit code 0

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