How Do I Effectively Store, Load, and Iterate Through Values in Java Property Files?

Storing and Handling Java Property Files

When working with configuration values in Java, property files provide a convenient way to store and manage key/value pairs. This article addresses some common questions related to using Java property files.

File Location and Extension

Regarding file location, property files can be placed anywhere accessible by the application. They do not require being stored in the same package as the loading class.

As for the file extension, Java property files do not have a specific extension requirement. However, it is a common practice to use the .properties extension for clarity.

Loading Property Files

To load a property file in your code, you can pass an InputStream to the Properties object. This allows for flexibility in loading files from various sources.

Properties properties = new Properties();
try {
  properties.load(new FileInputStream("path/filename"));
} catch (IOException e) {
  ...
}

Iterating Through Values

Once loaded, iterating through the property values is straightforward. You can use the stringPropertyNames() method to retrieve a list of property names and then access the corresponding values using the getProperty() method.

for(String key : properties.stringPropertyNames()) {
  String value = properties.getProperty(key);
  System.out.println(key + " => " + value);
}

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