java 如何使用绝对路径读取配置文件？
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How to read configuration file using absolute path?
提问by John Smith
I have a configuration file from which I have to read some properties. This configuration file exists in diferent locations but has the same name. I am able to read a configuration file, but only one from my project. I used the following code:
我有一个配置文件，我必须从中读取一些属性。此配置文件存在于不同的位置，但具有相同的名称。我能够读取一个配置文件，但只能从我的项目中读取一个。我使用了以下代码：
Properties prop = new Properties();
String propFileName = "config.properties";
InputStream inputStream = getClass().getClassLoader().getResourceAsStream(propFileName);
try {
prop.load(inputStream);
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
if (inputStream == null) {
try {
throw new FileNotFoundException("property file '" + propFileName + "' not found in the classpath");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
I have to open the config file using the full path so instead of propFileName="config.properties" to insert the absolute path to the config file. The config file can't be opened if I use the absolute path. How can this be done ?
我必须使用完整路径打开配置文件，而不是 propFileName="config.properties" 插入配置文件的绝对路径。如果我使用绝对路径，则无法打开配置文件。如何才能做到这一点 ？
回答by greg-449
InputStream inputStream = new FileInputStream("path");
will open a file with an absolute path.
将打开一个带有绝对路径的文件。
Note: This will only work for a file, it will not work for anything included in a plugin jar.
注意：这仅适用于文件，不适用于插件 jar 中包含的任何内容。
回答by Sridhar
You can use FileInputStream for locating config file outside of your project path.
您可以使用 FileInputStream 来定位项目路径之外的配置文件。
Properties prop = new Properties();
InputStream input = new FileInputStream("/home/ubuntu/Desktop/sample.properties");
prop.load(input);
System.out.println(prop.get("test"));
When specifying path we need give file name with extension.
指定路径时，我们需要提供带扩展名的文件名。
