Java 属性中的键可以包含空白字符吗？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2108103/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Can the key in a Java property include a blank character?
提问by bl4ckb0l7
We are getting properties (that we can not influence) out of a database and want to access them by a key/value mapping. We are facing the problem that one of the property keys includes a blank character.
我们正在从数据库中获取属性（我们无法影响）并希望通过键/值映射访问它们。我们面临的问题是其中一个属性键包含一个空白字符。
foo bar = barefoot
This is - correctly - interpreted as follows
这是 - 正确 - 解释如下
key: foo
value: bar = barefoot
Is there a way to include the blank in the key so that it's not interpreted as the delimiter? I guess this behaviour is just like intended, but I thought I could give it a try here.
有没有办法在键中包含空格，使其不被解释为分隔符？我想这种行为就像预期的那样，但我想我可以在这里尝试一下。
采纳答案by Bozho
As it seems the delimiter should be =, not space.
Hence - keyValuePair.split("=")should do.
看起来分隔符应该是=，而不是空格。因此 -keyValuePair.split("=")应该这样做。
If you are loading this from a java .propertiesfile, then you can extend java.util.Propertiesand override this method
如果你是从一个 java.properties文件加载它，那么你可以扩展java.util.Properties和覆盖这个方法
public synchronized void load(InputStream inStream) throws IOException
so that it parses the properties correctly.
以便它正确解析属性。
回答by Petar Minchev
Maybe you can escape the whitespaces: foo\ bar = barefoot
也许你可以逃避空格： foo\ bar = barefoot
Edit: Oops, I did not see that you can't change the properties.
编辑：糟糕，我没有看到您不能更改属性。
回答by sleske
I assume by "properties", you mean a Java property file (as written/read by java.util.Properties).
我假设“属性”是指 Java 属性文件（由 写入/读取java.util.Properties）。
Then, as you write yourself,
然后，当你自己写的时候，
foo bar = barefoot
must indeed be interpreted as
确实必须被解释为
key: foo
value: bar = barefoot
There's no way to configure this using the built-in Propertiesclass. You must either manipulate your input (escape the whitespace, change it to _ and back...), or write your own parser. Writing your own parser is probably better, as obviously your input isn't really a Java properties file to begin with :-).
没有办法使用内置Properties类来配置它。您必须操作您的输入（转义空格，将其更改为 _ 并返回...），或者编写您自己的解析器。编写自己的解析器可能会更好，因为显然您的输入并不是真正的 Java 属性文件：-)。
回答by Veaceslav Serghienco
You can escape every thing in properties file with Java Unicode:
您可以使用 Java Unicode 转义属性文件中的所有内容：
\u003dfor=\u0020for whitespace
\u003d为了=\u0020对于空白
For example:
例如：
foo bar = barefoot
must be:
必须是：
foo\u0020bar\u0020=\u0020barefoot
So will be:
那么将是：
key: "foo bar "
value: " barefoot"
回答by yurin
keyValuePair = keyValuePair.substring(0,indexOf("=")).replaceAll("\s+") +
keyValuePair.substring(indexOf("="));
