Java Property File Usage

on
                               Index:

            1. Reading Property File
            2. Writting Property File


            We have below file structure:

PropertyFileExample
         -src/main/java
                  -PropertyExample.java
         -src/main/config
                  -application.config
                  -output.config



                          
1. Reading Property File


a. Java code is this. 

Properties properties = new Properties();
InputStream inputStream = PropertyExample.class.getClassLoader()
       .getResourceAsStream("application.config");
  
properties.load(inputStream);

System.out.println("db.username: " + properties.getProperty("db.username"));
System.out.println("db.password: " + properties.getProperty("db.password"));
System.out.println("db.url: " + properties.getProperty("db.url"));






 


 


b. Output is: 




  db.username: usr
  db.password: 12345
  db.url: kaurl




 


=== application.config =====

  db.username=usr
  db.password=12345
  db.url=kaurl 


 


 


 


              

2. Writting to Property File

 


 


a. Java code is here. 


 


private static void writeToPropertyFile() throws FileNotFoundException,
            IOException {
        OutputStream outputStream = new FileOutputStream("src//main//config//output.config");
        Properties properties = new Properties();
        properties.setProperty("lang", "english");
        properties.setProperty("location", "europa");
        
        properties.store(outputStream, "comments");


}


 


b. After running this code, this file will be created.


 


        ==== output.config  ===== 


 




 #comments
 #Tue Jul 10 10:00:11 EEST 2018
 location=europa
 lang=english