Log4J的实践

ttl_web

操作系统:Red Hat Linux 9
系统环境变量:
-------------------------------------------------------------------------
# java env config file
# ant env config file
# /etc/profile.d/java.sh
export JAVA_HOME=/usr/java/j2sdk1.4.2_07
export ANT_HOME=/usr/ant
export LOG4J_HOME=/bak/logging-log4j-1.2.9
export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:${ANT_HOME}/bin
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre:$java_HOME/jre/lib:$LOG4J_HOME/dist/lib/log4j-1.2.9.jar
-------------------------------------------------------------------------
示例程序:
-------------------------------------------------------------------------
import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;   
public class Hello {   
    //得到记录器
    static Logger logger = Logger.getLogger(Hello.class.getName());      
    public static void main(String argv[]) {
        //读取配置文件
        BasicConfigurator.configure();
        //插入记录信息 - 格式化日志信息
        logger.debug("Here is debug.");
        logger.info("Here is info.");
        logger.warn ("Here is warn.") ;
        logger.error ("Here is error.") ;
    }
}
-------------------------------------------------------------------------
日志输出:
-------------------------------------------------------------------------
[root@localhost root]# java Hello
0 [main] DEBUG Hello  - Here is debug.
7 [main] INFO Hello  - Here is info.
8 [main] WARN Hello  - Here is warn.
8 [main] ERROR Hello  - Here is error.
-------------------------------------------------------------------------


本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/3534/showart_31810.html