JsonPath [start:end] 操作符

在 JsonPath 中,[start:end] 操作符表示获取数组中的一个子集,注意,包含 start,不包含 end。

Java 示例:

package com.hxstrive.json_path.operators;

import com.jayway.jsonpath.JsonPath;

/**
 * [start:end] 符号
 * @author hxstrive.com
 */
public class OperatorsDemo08 {

    public static void main(String[] args) {
        String json = "{" +
                "    \"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" +
                "}";
        Object obj = JsonPath.read(json, "$.store.book[1:3]");
        System.out.println(obj);

        obj = JsonPath.read(json, "$.store.book[-1:2]");
        System.out.println(obj);
        
        obj = JsonPath.read(json, "$.store.book[1:-1]");
        System.out.println(obj);
    }

}

运行示例,输出如下:

[{"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},{"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}]
[]

从上述示例可知,[start:end] 中的,如果 start 为负数,则将从数组末尾开始算,如果 end 为负数好像没有什么效果。

说说我的看法
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