Read CSV file column by column

Question

I want to read specific columns from a multi column csv file and print those columns in other csv file using Java. Any help please? Following is my code to print each token

Answer 1

I sugges to use the Apache Commons CSV https://commons.apache.org/proper/commons-csv/

Here is one example:

    Path currentRelativePath = Paths.get("");
    String currentPath = currentRelativePath.toAbsolutePath().toString();
    String csvFile = currentPath + "/pathInYourProject/test.csv";

    Reader in;
    Iterable records = null;
    try
    {
        in = new FileReader(csvFile);
        records = CSVFormat.EXCEL.withHeader().parse(in); // header will be ignored
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }

    for (CSVRecord record : records) {
        String line = "";
        for ( int i=0; i < record.size(); i++)
        {
            if ( line == "" )
                line = line.concat(record.get(i));
            else
                line = line.concat("," + record.get(i));
        }
        System.out.println("read line: " + line);
    }

It automaticly recognize , and " but not ; (maybe it can be configured...).

My example file is:

col1,col2,col3
val1,"val2",val3
"val4",val5
val6;val7;"val8"

And output is:

read line: val1,val2,val3
read line: val4,val5
read line: val6;val7;"val8"

Last line is considered like one value.