1.首先在POM.XML下引入slf4j-log4j依賴包

2.配置log4j-properties檔案

# rootLogger引數分別為：根Logger級別，輸出器stdout，輸出器log
log4j.rootLogger = info,stdout,log

# 輸出資訊到控制檯
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %d [%-5p] %l %rms: %m%n

# 輸出DEBUG級別以上的日誌到D://logs/debug.log
log4j.appender.log = org.apache.log4j.DailyRollingFileAppender
log4j.appender.log.DatePattern = '.'yyyy-MM-dd
log4j.appender.log.File = D://debug.log
log4j.appender.log.Encoding = UTF-8
#log4j.appender.log.Threshold = INFO
log4j.appender.log.layout = org.apache.log4j.PatternLayout
log4j.appender.log.layout.ConversionPattern = %d [%-5p] (%c.%t): %m%n
 

 3.編寫一個測試

package com.zhiyou100.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
 * 通常輸出日誌開銷非常大，從上述結果可見，
 * SLF4J通過{}作為佔位符的方式輸出字串，
 * 相比字串拼接的方式，效率有顯著的提升。
 * @author Administrator
 *
 */
public class LoggerTest {

    private static final Logger logger = 
    		LoggerFactory.getLogger(LoggerTest.class);

    public static void main(String[] args) {
        logger.info("Current Time: {}", System.currentTimeMillis());
        logger.info("Current Time: " + System.currentTimeMillis());
        logger.info("Current Time: {}", System.currentTimeMillis());
        logger.trace("trace log");
        logger.warn("warn log");
        logger.debug("debug log");
        logger.info("info log");
        logger.error("error log");
    }
}