Read Properties file using Java

Posted by DurgaPrasad on 22:57

Reading Properties file using Java


What is properties file?

  • Properties file is a simple collection of key-value pairs data.
  • Properties files are widely used for many purposes in all kinds of java applications, often to store configuration or localization data.

How to create file?

  • User can save the normal text file with .properties extension instead of file.

Where we use properties file

  • In well-developed framework, has to provide some details like type of browser, application url, , environment ) before trigger the automation suite.
  • For easy maintenance and manipulations of configuration details, user have to use file (it will store in Key-Value pair combination).

Example :

Create file with name as “configurations.properties and add below two lines in it.

browserName=Firefox

ApplicationUrl=http://www.gmail.com

In above example,
“browserName” is a Key and “Firefox” is the Value (assigned to Key)
"ApplicationUrl" is a Key and “http://www.gmail.com” is the Value(assigned to Key ApplicationUrl)

Let us see how to read file data using Java:

FileInputStream fInput= new FileInputStream(new File(“Path of the .properties file”));
Properties configProps=new Properties();//Predefined class in java
configProps.load(fInput);
System.out.println(“Value assigned to ‘browserName’ key is :”+configProps.getProperty(“browserName”));
System.out.println(“Value assigned to ‘ApplicationUrl’ key is :”+configProps.getProperty(“ApplicationUrl”));
Now, please change value from “Firefox” to “Chrome” in file and again re-run the program.
Note: Duplicate key will are not in properties fileKey name should be unique. User cannot give browserName=Firefox browserName=Chrome at time in same file.