JsonPath的使用

最新推荐文章于 2025-06-05 14:48:11 发布

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最新推荐文章于 2025-06-05 14:48:11 发布

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本文介绍了JsonPath在删除JSON值和提升性能方面的应用。通过使用delete方法可以方便地移除JSON对象中的特定值，若需对大量数据进行操作，预编译规则能显著提高效率。

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1.如何删除json里面的某个值

采用JsonPath里面delete方法，具体代码如下：

package testCode;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.jayway.jsonpath.Configuration;
import com.jayway.jsonpath.JsonPath;
import com.jayway.jsonpath.Predicate;

public class TestJsonPath {

    public JSONObject delete(JSONObject j){

        Configuration configuration = Configuration.builder().build();
        JsonPath jsonPath = JsonPath.compile("$.store.book[0].title", new Predicate[0]);
        j = jsonPath.delete(j, configuration);
        return j;
    }
    
    public static void main(String args[]){
        String s = "{\n" +
                "    \"store\": {\n" +
                "        \"book\": [\n" +
                "            {\n" +
                "                \"category\": \"reference\",\n" +
                "                \"author\": \"Nigel Rees\",\n" +
                "                \"title\": \"Sayings of the Century\",\n" +
                "                \"price\": 8.95\n" +
                "            },\n" +
                "            {\n" +
                "                \"category\": \"fiction\",\n" +
                "                \"author\": \"Evelyn Waugh\",\n" +
                "                \"title\": \"Sword of Honour\",\n" +
                "                \"price\": 12.99\n" +
                "            },\n" +
                "            {\n" +
                "                \"category\": \"fiction\",\n" +
                "                \"author\": \"Herman Melville\",\n" +
                "                \"title\": \"Moby Dick\",\n" +
                "                \"isbn\": \"0-553-21311-3\",\n" +
                "                \"price\": 8.99\n" +
                "            },\n" +
                "            {\n" +
                "                \"category\": \"fiction\",\n" +
                "                \"author\": \"J. R. R. Tolkien\",\n" +
                "                \"title\": \"The Lord of the Rings\",\n" +
                "                \"isbn\": \"0-395-19395-8\",\n" +
                "                \"price\": 22.99\n" +
                "            }\n" +
                "        ],\n" +
                "        \"bicycle\": {\n" +
                "            \"color\": \"red\",\n" +
                "            \"price\": 19.95\n" +
                "        }\n" +
                "    },\n" +
                "    \"expensive\": 10\n" +
                "}";

        JSONObject json = JSONObject.parseObject(s);
        String author = JsonPath.read(json, "$.store.book[0].title");
        System.out.println("test1"+author);
        TestJsonPath t = new TestJsonPath();
        t.delete(json);
        System.out.println(json);
    }   
}

2.进行规则的预编译来提升性能

如果对一个json要进行大数据量的操作可以使用

参考资料：

1.http://www.ibloger.net/article/2329.html