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Converting any file into a CSV at the code level in Java can be done either manually using core Java I/O or by leveraging libraries like OpenCSV for easier handling of delimiters, quotes, and special characters.
Manual Conversion Using Core Java
Step 1: Read the Input File Use BufferedReader or Scanner to read the source file line by line.
Step 2: Parse and Format Data Split each line into fields based on your file’s delimiter (e.g., space, tab, semicolon) and join them with commas.
Step 3: Write to CSV File Use BufferedWriter or PrintWriter to write formatted lines into a .csv file.
import java.io.*;import java.util.*;public class FileToCSV {public static void main(String[] args) throws IOException {String inputPath = "input.txt";String outputPath = "output.csv";try (BufferedReader br = new BufferedReader(new FileReader(inputPath));PrintWriter pw = new PrintWriter(new FileWriter(outputPath))) {String line;while ((line = br.readLine()) != null) {String[] fields = line.split("\\s+"); // split by spacespw.println(String.join(",", fields));}}System.out.println("CSV file created successfully.");}}Copied!âś•Copy How to Write to a CSV File in Java - Baeldung
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