log4j的操纵步骤[Java编程]

1、建一个log4j.properties的配置文件,放到有main的进口类的相同途径下.

og4j.rootLogger=debug, stdout, R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller´s file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%d %5p [%t] (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=YesFTP.log

log4j.appender.R.MaxFileSize=1000KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d %5p [%t] (%F:%L) - %m%n

2、在进口类的静态区初始化log4j

static {
　PropertyConfigurator.configure(
　YesFTPClientFrame.class.getResource("log4j.properties"));
}

3、在每一个需求log的地方都初始化一个私有静态的变量

private static Logger logger = Logger.getLogger(xx.class);

4、利用log4j供应的办法

logger.info(”hello”);

5、用log4j输出非常的仓库信息

logger.error("oops, got an exception: ", e);