I'm currently using Filewriter to write a file. I was writing about 75 lines of text to the file with no problems. The requirement has changed and it needs write over 17,000 lines of text to the file. It is taking 3hours and 45minutes to complete. Is there a better way to create a file?

Source:
public void writeLog(String logRecord)
{
try
{
FileWriter out = new FileWriter(fileDir + "\" + fileName, true);
out.write(logRecord);
out.flush();
out.close();
}
catch (IOException e)
{
System.err.println(e);
}
}

public void newWrite(String logRecord)
{
try
{
FileWriter out = new FileWriter(fileDir + "\" + fileName, false);
out.write(logRecord);
out.flush();
out.close();
}
catch (IOException e)
{
System.err.println(e);
}
}