create new logfile with some initial text in logback
public class FileAppenderWithHeader extends FileAppender {
private String header;
public String getHeader() {
return header;
}
public void setHeader(String header) {
this.header = header;
}
@Override
public void openFile(String fileName) throws IOException {
super.openFile(fileName);
File activeFile = new File(getFile());
if (activeFile.exists() && activeFile.isFile() && activeFile.length() == 0) {
write((header + "\n").getBytes());
}
}
private void write(byte[] byteArray) throws IOException {
if (byteArray == null || byteArray.length == 0)
return;
lock.lock();
try {
super.getOutputStream().write(byteArray);
if (super.isImmediateFlush()) {
super.getOutputStream().flush();
}
} finally {
lock.unlock();
}
}
}