log4j 一个线程记录一个日志怎么配置

public class ThreadLog1 extends Thread {    private static Logger logger = Logger.getLogger("file_1");    private boolean stop = false;    public void run() {        while(!stop){            System.out.println("I am ThreadLog1");            logger.info("I am ThreadLog1");            try {                Thread.sleep(1000);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }    public boolean isStop() {        return stop;    }    public void setStop(boolean stop) {        this.stop = stop;    }}