Java - 属性：在运行时向属性文件添加新密钥？

问题描述

是否可以创建新的属性文件并在运行时添加键和值？
我想在安装我的应用程序时根据用户输入向属性文件添加新密钥。我检查了Java Properties类，但它似乎可以设置现有键的值，但不能将新键添加到属性文件。

Is it possible to create a new properties file and add keys and values in run time?I want to add new keys to properties file depending on user input while installing my application. I checked out Java Properties class but it seem it can set values to existing keys but can not add new keys to properties file.

推荐答案

您只需使用当前不存在的密钥调用 setProperty 即可添加新属性。这只会在内存中执行 - 您必须再次调用 store 以将更改反映回文件：

You can add new properties just by calling setProperty with a key which doesn't currently exist. That will only do it in memory though - you'll have to call store again to reflect the changes back to a file:

Properties prop = new Properties();
prop.load(...); // FileInputStream or whatever

prop.setProperty("newKey", "newValue");
prop.store(...); // FileOutputStream or whatever

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