Read from CSV file with Java

Question

I am trying to learn Java... And I am facing a (simple) problem.

==> I have a csv file:

This road;123;That place
Another road;456;Another place

==> I have some java code:

package tijdelijk;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

public class ReadFromCSV {

    public static void main(String[] args) {
        String CSVadres = "src/tijdelijk/ReadFromCSV.csv";
        try (Scanner adresScanner = new Scanner(new File(CSVadres))) {
            adresScanner.useDelimiter(";");
            while (adresScanner.hasNext()) {
                String adresIter = adresScanner.next();
                int nummerIter = Integer.parseInt(adresScanner.next());
                String plaatsIter = adresScanner.nextLine();
                System.out.println("straat\t\t" + adresIter);
                System.out.println("huisnummer\t" + nummerIter);
                System.out.println("plaats\t\t" + plaatsIter);
                System.out.println("\n");
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(ReadFromCSV.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

==> I have output:

run:
straat      This road
huisnummer  123
plaats      ;That place

straat      Another road
huisnummer  456
plaats      ;Another place

BUILD SUCCESSFUL (total time: 0 seconds)

==> I have a problem....

Why do I get the semicolon in teh "plaats" field? How should I write my code to fix this?

Thanks in advance for your help. Kind regards from The Netherlands, Pierre

Answer 1

The Scanner#useDelimiter method takes a regex string as input. So you could use it by defining two delimiters like the following

adresScanner.useDelimiter(";|\n");

The first one will be your inline delimiter and the second one is the newline delimiter.

Then, you don't need to use nextLine() anymore but only next()

Answer 2

Instead of using the scanner, you can read the entire line into a string and then split that string based on the semicolon and put the split string into an array:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Main {

    public static void main(String[] args) {
        String CSVadres = "C:/LCC Lev 4/test.csv";
        try (Scanner adresScanner = new Scanner(new File(CSVadres))) {
            while (adresScanner.hasNext()) {
                String fullAddress = adresScanner.nextLine();
                String [] addFields = fullAddress.split(";");
                String adresIter = addFields[0];
                String nummerIter = addFields[1];
                String plaatsIter = addFields[2];
                System.out.println("straat\t\t" + adresIter);
                System.out.println("huisnummer\t" + nummerIter);
                System.out.println("plaats\t\t" + plaatsIter);
                System.out.println("\n");
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}