(Java) Update CSV File

Demonstrates how to read a CSV, update some cells, and save.

The Chilkat CSV library/component/class is freeware. The downloads for .NET, C++, Perl, Java, Ruby, and Python contain all of the Chilkat classes, some of which are freeware and some of which require licensing.

 Chilkat Java Library Downloads for Windows, Linux, and MAC OS X

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  This example program loads a file (sample.csv)
    //  that contains this content:
    // 
    //  year,color,country,food
    //  2001,red,France,cheese
    //  2005,blue,"United States",hamburger
    //  2008,green,Italy,pasta
    //  1998,orange,Japan,sushi
    // 
    //  The first row contains the column names.
    //  This file is available at:
    //  http://www.chilkatsoft.com/testData/sample.csv

    CkCsv csv = new CkCsv();

    //  Prior to loading the CSV file, indicate that the 1st row
    //  should be treated as column names:
    csv.put_HasColumnNames(true);

    //  Load the CSV records from the file:
    boolean success;
    success = csv.LoadFile("sample.csv");
    if (success != true) {
        System.out.println(csv.lastErrorText());
        return;
    }

    //  Change "cheese" to "baguette"
    //  ("cheese" is at row=0, column=3
    csv.SetCell(0,3,"baguette");

    //  Change "blue" to "magenta"
    csv.SetCell(1,1,"magenta");

    //  Write the updated CSV to a string and display:
    String csvDoc;
    csvDoc = csv.saveToString();
    System.out.println(csvDoc);

    //  Save the CSV to a file:
    success = csv.SaveFile("out.csv");
    if (success != true) {
        System.out.println(csv.lastErrorText());
    }

  }
}