Reading and writing propertis file

Properties file is a simple text file with extension .properties generally used to store projects configurations like database connection details and text labels in case project is a web application.

Here is a sample to read data from a properties file and then write it back to an xml file.

I have a properties file named test.properties with one entry as below.
// test.properties
msg1=hello bharat, this is comming from properties file.

package com.bharat.io;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.OutputStream;
import java.util.Properties;


public class ReadWritePropertiesFile
{

  public static void main(String... args) throws Exception
  {
    Properties props = new Properties();
    props.load(new FileReader("test.properties"));
    System.out.println(props.get("msg1"));
    
    props.put("msg2", "This was written to properties file from java");
    
    
    OutputStream os = new FileOutputStream(new File("test.xml"));
    props.storeToXML(os, "my test comment");
  }
} 

This is the xml file where properties get written to.
// test.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
    <comment>my test comment</comment>
    <entry key="msg2">This was written to properties file from java</entry>
    <entry key="msg1">hello bharat, this is comming from properties file.</entry>
</properties>

I prefer storing ddl sql statements in a xml properties file as queries are formatted and readable.