package com.howtodoinjava.io;

import com.opencsv.CSVReader;

import com.opencsv.exceptions.CsvValidationException;

import java.io.*;

import java.util.Arrays;

import java.util.Scanner;

public class ReadCSV {

public static void main(String[] args) {

// 1. OpenCSV

try(CSVReader reader

= new CSVReader(new FileReader("SampleCSVFile.csv")))

{

String [] nextLine;

//Read one line at a time

while ((nextLine = reader.readNext()) != null)

{

//Use the tokens as required

System.out.println(Arrays.toString(nextLine));

}

}

catch (IOException | CsvValidationException e) {

e.printStackTrace();

}

//2 Scanner

//Get scanner instance

try(Scanner scanner = new Scanner(new File("SampleCSVFile.csv"))){

//Read line

while (scanner.hasNextLine()) {

String line = scanner.nextLine();

//Scan the line for tokens

try (Scanner rowScanner = new Scanner(line)) {

rowScanner.useDelimiter(",");

while (rowScanner.hasNext()) {

System.out.print(scanner.next());

}

}

}

} catch (FileNotFoundException e) {

e.printStackTrace();

}

//3 Splitting

try(BufferedReader fileReader

= new BufferedReader(new FileReader("SampleCSVFile.csv")))

{

String line = "";

//Read the file line by line

while ((line = fileReader.readLine()) != null)

{

//Get all tokens available in line

String[] tokens = line.split(",");

//Verify tokens

System.out.println(Arrays.toString(tokens));

}

}

catch (IOException e) {

e.printStackTrace();

}

}

}