How to read and write properties files in Kotlin

How to read and write properties files in Kotlin.

Here's a step-by-step tutorial on how to read and write properties files in Kotlin:

1. Import the necessary packages:

   import java.io.FileInputStream
   import java.io.FileOutputStream
   import java.util.Properties

2. Reading Properties file:

   a. Create an instance of the Properties class:

   val properties = Properties()

   b. Load the properties from the file:

   val fileInputStream = FileInputStream("path/to/properties/file.properties")
   properties.load(fileInputStream)

   c. Access the properties using their keys:

   val value = properties.getProperty("key")

3. Writing Properties file:

   a. Create an instance of the Properties class:

   val properties = Properties()

   b. Set the properties and their values:

   properties.setProperty("key1", "value1")
   properties.setProperty("key2", "value2")

   c. Save the properties to a file:

   val fileOutputStream = FileOutputStream("path/to/properties/file.properties")
   properties.store(fileOutputStream, "Optional comment")

4. Reading and Writing Properties file using Kotlin DSL:

   a. Create a Kotlin properties file (.kts) with the desired properties:

   val properties = Properties().apply {
       setProperty("key1", "value1")
       setProperty("key2", "value2")
   }

   b. Load the properties from the file:

   val fileInputStream = FileInputStream("path/to/properties/file.kts")
   properties.load(fileInputStream)

   c. Access the properties using their keys:

   val value = properties.getProperty("key")

   d. Save the properties to a file:

   val fileOutputStream = FileOutputStream("path/to/properties/file.kts")
   properties.store(fileOutputStream, "Optional comment")

5. Closing the streams:

   Don't forget to close the input and output streams after reading or writing the properties file. You can use the use function for automatic closing:

   fileInputStream.use {
       // read or write operations
   }
   fileOutputStream.use {
       // read or write operations
   }

That's it! You now know how to read and write properties files in Kotlin.