Java append new column to csv file

Question

I want to calculate some column data and write it to csv file as column. Then after calculating other column of data I want to append it to same file but as new

Answer 1

Hope this will help you.

{
    //CREATE CSV FILE 
    StringBuffer csvReport = new StringBuffer(); 
    csvReport.append("header1,Header2,Header3\n"); 
    csvReport.append(value1 + "," + value2 + "," + value3 + "\n"); 

    generateCSVFile( filepath,fileName, csvReport); // Call the implemented mathod 
}

public void generateCSVFile(String filepath,String fileName,StringBuffer result)
{
    try{

    FileOutputStream fop = new FileOutputStream(filepath);

    // get the content in bytes
    byte[] contentInBytes = result.toString().getBytes();

    fop.write(contentInBytes);
    fop.flush();

    //wb.write(fileOut);
    if(fop != null)
        fop.close();
    }catch (Exception ex)
    {
        ex.printStackTrace();
    }
}