JSONObject：为什么JSONObject改变属性的顺序 [英] JSONObject : Why JSONObject changing the order of attributes

问题描述

我试图使用JSON对象构造一个JSON字符串

I was trying to construct an JSON String using JSON Object

我希望以这种方式构造JSON字符串

I want the JSON String to be constructed this way

{
    "Level": "3",
    "Name": "testLogger",
    "IPADDRESS": "testMachiene",
    "Message": "hiiiiiiiiii",
    "TimeStamp": "test12345678"
}

这是我的简单程序

package com;

import org.json.JSONObject;

public class Teste {

    public static void main(String args[]) throws Exception {

        int loglevel = 3;
        String loggerName = "testLogger";
        String machieneName = "testMachiene";
        String timeStamp = "test12345678";
        String message = "hiiiiiiiiii";

        JSONObject obj = new JSONObject();

        obj.put("TimeStamp", message);
        obj.put("Message", timeStamp);
        obj.put("IPADDRESS", machieneName);
        obj.put("Name", loggerName);
        obj.put("Level", loglevel);

        System.out.println(obj.toString());

    }

}

它是以这种方式构建

{
    "Name": "testLogger",
    "TimeStamp": "hiiiiiiiiii",
    "Message": "test12345678",
    "Level": 3,
    "IPADDRESS": "testMachiene"
}

我的问题是为什么它改变了属性的顺序

My question is that why its changing the order of attributes

我可以订购吗？我希望在哪里？

Can i have the order in which i wish ??

推荐答案

请在此处查看答案： JSON订单混乱

你不能也不应该依赖于
JSON对象中元素的排序。

You cannot and should not rely on the ordering of elements within a JSON object.

来自 http://www.json.org/ ：

对象是一组无序的名称/值对

"An object is an unordered set of name/value pairs"

因此，JSON图书馆员es可以自由地重新排列元素的顺序。这不是错误。

As a consequence, JSON libraries are free to rearrange the order of the elements as they see fit. This is not a bug.

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