1.在服务中启动运行

//import org.slf4j.Logger;
//import org.slf4j.LoggerFactory;
import org.apache.log4j.Logger;
public class GetVoiceService {

    //private Logger log = LoggerFactory.getLogger(GetVoiceService.class);

    private static Logger log = Logger.getLogger(com.qzlink.robot.service.GetVoiceService.class);

    long start = Long.parseLong((new SimpleDateFormat("yyyyMMddHHmmssSSS")).format(new Date()));
    log.info("time:" + start);

}

配置：log4j.properties

log4j.rootLogger=info,file
#log4j.rootLogger=INFO, Console
#log4j.rootLogger=info,file
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File=/usr/local/voice_robot/web/ROOT/cdr_log/test/idslog_timing.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d  %c,%M,%F,%L %p - %m%n

log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=(%r ms) [%t] %-5p: %c#%M %x: %m%n

#log4j.logger.com.genuitec.eclipse.sqlexplorer=DEBUG
#log4j.logger.org.apache=WARN
#log4j.logger.org.hibernate=WARN

原有的：

log4j.rootLogger=INFO, Console 

log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=(%r ms) [%t] %-5p: %c#%M %x: %m%n

#log4j.logger.com.genuitec.eclipse.sqlexplorer=DEBUG
#log4j.logger.org.apache=WARN
#log4j.logger.org.hibernate=WARN

2.在控制台运行

import org.apache.log4j.Logger;

public class TestLog {

    //public static Logger log3 = LoggerFactory.getLogger(com.qzlink.test.TestLog.class);
    public static String str2;
//    //获取日志记录器Logger，名字为本类类名
//    public static Logger log2 = LoggerFactory.getLogger(com.qzlink.test.TestLog.class);
    private static Logger log3 = Logger.getLogger(com.qzlink.test.TestLog.class);
    public static void main(String[] args) throws Exception {
        System.out.println("===================");
        long start = Long.parseLong((new SimpleDateFormat("yyyyMMddHHmmssSSS")).format(new Date()));
        System.out.println(start);
        log3.info("time:" + start);

参考资料：
java项目用log4j写日志