Replace System Properties 

Apache Commons Lang 3.0 is a java library with lot of utilities and reusable components. This requires the library commons-lang3-3.0.1.jar to be in classpath. The following example shows using StrSubstitutor.replaceSystemProperties() API. It replaces all the occurrences of variables in the given source object with their matching values from the system properties.

File Name  :   com/bethecoder/tutorials/commons_lang/tests/gen/ReplaceSysPropsTest.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.commons_lang.tests.gen; import org.apache.commons.lang3.text.StrSubstitutor; public class ReplaceSysPropsTest {   /**    * @param args    */   public static void main(String[] args) {            String template = "Java home : ${java.home} \nUser dir : ${user.dir}";     System.out.println(StrSubstitutor.replaceSystemProperties(template));   } }

Java home : C:\Program Files\Java\jdk1.6.0_10\jre 
User dir : C:\BTC\COMMONS_LANG001