框架主页: http://www.slf4j.org/manual.html
下载软件包:slf4j-1.5.5.zip
解压后可以看见如下jar文件:
========================================================
这9个jar含有源码文件,类似"*-sources.jar".
2008-10-17 17:58 21,796 slf4j-api-1.5.5.jar
2008-10-17 17:58 7,104 slf4j-jcl-1.5.5.jar
2008-10-17 17:58 8,787 slf4j-jdk14-1.5.5.jar
2008-10-17 17:58 9,648 slf4j-log4j12-1.5.5.jar
2008-10-17 17:58 5,249 slf4j-nop-1.5.5.jar
2008-10-17 17:58 7,550 slf4j-simple-1.5.5.jar
2008-10-17 17:58 29,487 slf4j-ext-1.5.5.jar
2008-10-17 17:58 16,746 jcl-over-slf4j-1.5.5.jar
2008-10-17 17:46 4,368 jul-to-slf4j-1.5.5.jar
========================================================
2008-10-17 17:46 9,665 log4j-over-slf4j-1.5.5.jar
2008-10-17 17:58 28,567 slf4j-migrator-1.5.5.jar
2008-10-17 17:49 2,025 integration-1.5.5.jar
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
不要怕,我们一个一个击破这些东东.
首先我们写一个使用的hello world 程序.
1.在classpath中导入" slf4j-api-1.5.5.jar"," slf4j-simple-1.5.5.jar" 文件.
package com; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * slf4j Tester * * * @author mike
*/ public class Slf4jTest { final Logger logger = LoggerFactory.getLogger(Slf4jTest.class); Integer t; Integer oldT; public void setTemperature(Integer temperature) { oldT = t; t = temperature; logger.error(" Temperature set to {}. Old temperature was {}. ", t, oldT); if (temperature.intValue() > 23) { logger.info(" Temperature has risen above 23 degrees. "); } if (temperature.intValue() < 0) { logger.warn(" Temperature has below 0 degrees. "); } } public static void main(String[] args) { Sif4jTest wombat = new Sif4jTest(); wombat.setTemperature(1); wombat.setTemperature(24); wombat.setTemperature(-9); } }
运行结果:
引用
0 [main] ERROR com.Sif4jTest - Temperature set to 1. Old temperature was null.
0 [main] ERROR com.Sif4jTest - Temperature set to 24. Old temperature was 1.
0 [main] INFO com.Sif4jTest - Temperature has risen above 23 degrees.
0 [main] ERROR com.Sif4jTest - Temperature set to -9. Old temperature was 24.
0 [main] WARN com.Sif4jTest - Temperature has below 0 degrees.
2.替换" slf4j-simple-1.5.5.jar" 为 " slf4j-jdk14-1.5.5.jar".
再次运行:
引用
2008-11-14 11:24:24 com.Sif4jTest setTemperature
严重: Temperature set to 1. Old temperature was null.
2008-11-14 11:24:24 com.Sif4jTest setTemperature
严重: Temperature set to 24. Old temperature was 1.
2008-11-14 11:24:24 com.Sif4jTest setTemperature
信息: Temperature has risen above 23 degrees.
2008-11-14 11:24:24 com.Sif4jTest setTemperature
严重: Temperature set to -9. Old temperature was 24.
2008-11-14 11:24:24 com.Sif4jTest setTemperature
警告: Temperature has below 0 degrees.
3.替换" slf4j-jdk14-1.5.5.jar"为" slf4j-log4j12-1.5.5.jar"并加入"log4j-1.2.14.jar"和所需的" log4j.properties"配置文件.
再次运行:
引用
2008-11-14 11:26:30 main ERROR com.Sif4jTest:[22]: Temperature set to 1. Old temperature was null.
2008-11-14 11:26:30 main ERROR com.Sif4jTest:[22]: Temperature set to 24. Old temperature was 1.
2008-11-14 11:26:30 main INFO com.Sif4jTest:[25]: Temperature has risen above 23 degrees.
2008-11-14 11:26:30 main ERROR com.Sif4jTest:[22]: Temperature set to -9. Old temperature was 24.
2008-11-14 11:26:30 main WARN com.Sif4jTest:[28]: Temperature has below 0 degrees.
哈哈,看见效果了吧?
个人总结: 根据classpath中放置的包的不同选择不同的日志表现形式,使效果的更改不影响代码.
详细使用和实现方式请查看官方网站说明.