Sometime we need to generate CSV from data as per requirement. You can easily create CSV file by following the below steps:

1. Write the following Maven configuration in pom.xml file in your project:

<dependency>
<groupid>net.sf.opencsv</groupid>
<artifactid>opencsv</artifactid>
<version>2.3</version>
</dependency>

1. Now define the below method to create the CSV file:

    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;

    private void generateCsvFile(String fileName)
    {
            //Delimiter used in CSV file
                private static final String COMMA_DELIMITER = ",";
            private static final String NEW_LINE_SEPARATOR = "\n";
            try {
                FileWriter writer = new FileWriter(fileName);

                //we need to write out the header line
                writer.append("tickitId");
                writer.append('COMMA_DELIMITER');
                writer.append("subject");
                writer.append('COMMA_DELIMITER');
                writer.append("tickitType");
                writer.append('NEW_LINE_SEPARATOR');

                // write out a few records
                writer.append("1");
                writer.append('COMMA_DELIMITER');
                writer.append("Test Tickit 1");
                writer.append('COMMA_DELIMITER');
                writer.append("assigned");
                writer.append('NEW_LINE_SEPARATOR');

                writer.append("2");
                writer.append('COMMA_DELIMITER');
                writer.append("Test Tickit 2");
                writer.append('COMMA_DELIMITER');
                writer.append("verified");
                writer.append('NEW_LINE_SEPARATOR');

                writer.append("3");
                writer.append('COMMA_DELIMITER');
                writer.append("Test Tickit 3");
                writer.append('COMMA_DELIMITER');
                writer.append("rejected");
                writer.append('NEW_LINE_SEPARATOR');

                writer.flush();
                writer.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

    }

Output Format:

tickitId,subject,tickitType
1,Test Tickit 1,assigned
2,Test Tickit 2,verified
3,Test Tickit 3,rejected

Hope this will help you :)