将字符串解析为属性 [英] Parsing string as properties

问题描述

我正在从数据库中读取属性文件。
我检查了 java.util.Properties ，并且没有从 String 实例解析的方法。有没有办法做到这一点？

I am reading a properties file from database. I checked java.util.Properties and there's no method to parse from a String instance. Is there any way to do it?

推荐答案

你是对的 java.util.Properties 没有从 String 读取的方法 - 但事实上它有更多通用方法从读取InputStream 或读者。

You're right that java.util.Properties doesn't have a method to read from a String - but in fact it has more general methods that read from an InputStream or Reader.

所以你可以打电话给 loading 如果你有某种方式将 String 作为其中任何一个呈现，即一个有效地逐个遍历字符的源。这感觉它应该存在，事实确实如此 - java.io.StringReader 。

So you can call load if you have some way of presenting your String as either of these, i.e. a source which effectively iterates over characters one by one. This feels like it ought to exist, and indeed it does - java.io.StringReader.

然后把它放在一起非常简单：

Putting it together, then, is quite straightforward:

public Properties parsePropertiesString(String s) {
    // grr at load() returning void rather than the Properties object
    // so this takes 3 lines instead of "return new Properties().load(...);"
    final Properties p = new Properties();
    p.load(new StringReader(s));
    return p;
}

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