使用 Apache log4j OptionConverter 來取得系統變數

Apache Logging Services Project - Apache log4j

import org.apache.log4j.helpers.OptionConverter;

public class Main {

public static void main(String[] args) {
 String fileSeparator =
  System.getProperty("file.separator");

 String javaLogFile = "${user.home}" +
  fileSeparator + "java0.log";

 javaLogFile = OptionConverter.substVars(
   javaLogFile, System.getProperties());
 System.out.println(javaLogFile);
}

}