访问.jar外的属性文件？ [英] Accessing properties files outside the .jar?

问题描述

我有一个.jar文件，我正在整理。我想创建一个非常简单的.properties文件，其中包含可配置的内容，例如用户名和文件。其他的东西，所以他们可以手工编辑，而不是我必须包括一个GUI编辑器。

I have a .jar file I'm putting together. I want to create a really really simple .properties file with configurable things like the user's name & other stuff, so that they can hand-edit rather than my having to include a GUI editor.

我想做的是能够搜索，此订单：

What I'd like to do is to be able to search, in this order:

1. 指定的属性文件（ args [0] ）


2. 当前目录中的MyApp.properties（调用Java的目录）


3. 用户目录中的MyApp.properties（ user.home 系统属性？）


4. MyApp存储应用程序.jar的目录中的.properties

1. a specified properties file (args[0])
2. MyApp.properties in the current directory (the directory from which Java was called)
3. MyApp.properties in the user's directory (the user.home system property?)
4. MyApp.properties in the directory where the application .jar is stored

我知道如何访问＃1和＃3（我认为），但是如何在运行时＃2和＃4确定？

I know how to access #1 and #3 (I think), but how can I determine at runtime #2 and #4?

推荐答案

＃2是user.dir系统属性。 ＃3是user.home属性。

#2 is the "user.dir" system property. #3 is the "user.home" property.

＃4无论你怎么接近它都有点像kludge。如果您从JAR加载的类不在系统类路径上，则这是一种替代技术。

#4 is a bit of a kludge no matter how you approach it. Here's an alternate technique that works if you have a class loaded from a JAR not on the system classpath.

CodeSource src = MyClass.class.getProtectionDomain().getCodeSource();
if (src != null) {
  URL url = new URL(src.getLocation(), "MyApp.properties");
  ...
} 
else {
  /* Fail... */
}

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