Convert MySQL Table into CSV using JAVA

Here's the code for converting available mysql table into csv.

String filename ="D:/test.csv";
Connection conn=null;
Statement stmt=null;
try {
//filewriter
FileWriter fw = new FileWriter(filename);
conn=DbConnection.getConnection(); //db connection function
String query = "select * from tablename";
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(query);
 while (rs.next()) {
fw.append(rs.getString(1));fw.append(',');
fw.append(rs.getString(2));
fw.append(',');
fw.append(rs.getString(3));
fw.append('\n');
}
fw.flush();
fw.close();
conn.close();
System.out.println("CSV File is created successfully.");
} catch (Exception e) {
e.printStackTrace();
}