Java - 属性：在运行时向属性文件添加新键？
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Java - Properties: Add new keys to properties file in run time?
提问by Olcay Erta?
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.
是否可以在运行时创建新的属性文件并添加键和值？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，但它似乎可以为现有键设置值，但不能向属性文件添加新键。
回答by Jon Skeet
You can add new properties just by calling setPropertywith a key which doesn't currently exist. That will only do it in memory though - you'll have to call storeagain to reflect the changes back to a file:
您可以通过setProperty使用当前不存在的键调用来添加新属性。但这只会在内存中执行 - 您必须store再次调用以将更改反映回文件：
Properties prop = new Properties();
prop.load(...); // FileInputStream or whatever
prop.setProperty("newKey", "newValue");
prop.store(...); // FileOutputStream or whatever
