How to programmatically guess whether a CSV file is comma or semicolon delimited

Question

In most cases, CSV files are text files with records delimited by commas. However, sometimes these files will come semicolon delimited. (Excel will use semicolon delimiter

Answer 1

You can read the first line

FileReader fileReader = new FileReader(filePath);
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    String s = bufferedReader.readLine();
    String substring = s.substring(s.indexOf(firstColumnName) + 3, s.indexOf(firstColumnName) + 4);
    bufferedReader.close();
    fileReader.close();
    substring.charAt(0);

Then you capture this value

substring.charAt(0)

depending on whether the CSV is comma or semicolon can use the last value