Skip to main content

How to read and write CSV files in Kotlin

How to read and write CSV files in Kotlin.

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

Reading CSV Files​

Step 1: Import the necessary libraries​

import java.io.BufferedReader
import java.io.FileReader
import java.io.IOException

Step 2: Create a function to read the CSV file​

fun readCSVFile(filePath: String) {
    try {
        val reader = BufferedReader(FileReader(filePath))
        var line: String?
        
        // Read each line of the file
        while (reader.readLine().also { line = it } != null) {
            // Process the line (e.g., split into columns)
            val columns = line!!.split(",")
            
            // Use the data as needed (e.g., print to console)
            for (column in columns) {
                println(column)
            }
        }
        reader.close()
    } catch (e: IOException) {
        e.printStackTrace()
    }
}

Step 3: Call the function and provide the file path​

val filePath = "path/to/your/file.csv"
readCSVFile(filePath)

Writing CSV Files​

Step 1: Import the necessary libraries​

import java.io.BufferedWriter
import java.io.FileWriter
import java.io.IOException

Step 2: Create a function to write data to a CSV file​

fun writeCSVFile(filePath: String, data: List<List<String>>) {
    try {
        val writer = BufferedWriter(FileWriter(filePath))
        
        // Write each row of data to the file
        for (row in data) {
            writer.write(row.joinToString(","))
            writer.newLine()
        }
        writer.close()
    } catch (e: IOException) {
        e.printStackTrace()
    }
}

Step 3: Call the function and provide the file path and data​

val filePath = "path/to/your/file.csv"
val data = listOf(
    listOf("Name", "Age", "Email"),
    listOf("John Doe", "25", "john@example.com"),
    listOf("Jane Smith", "30", "jane@example.com")
)
writeCSVFile(filePath, data)

That's it! You now know how to read and write CSV files in Kotlin. Feel free to customize the code based on your specific requirements.