Java原生日志类JUL

import java.io.IOException;
import java.util.UUID;
import java.util.logging.*;

public class LogDemo {

    public static void main(String[] args) throws IOException {

        Logger global = Logger.getGlobal();

        FileHandler fileHandler = new FileHandler("./tmp.log", true);
        fileHandler.setFormatter(new CustomFormatter());
        fileHandler.setEncoding("UTF-8");
        global.addHandler(fileHandler);

        LogRecord logRecord = new LogRecord(Level.INFO, UUID.randomUUID().toString() + "\n");
        global.log(logRecord);

    }
}

class CustomFormatter extends Formatter {

    @Override
    public String format(LogRecord record) {
        return record.getMessage();
    }

}