1，关于日志记录是开发中必不可少的知识，现在给大家详细说下如何记录日志信息；原理就不多说了看实际操作
2，配置log4j文件：具体配置表示什么意思就不说了一看就明白 嘿嘿
log4j.rootCategory=DEBUG,stdlog,errorlog
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Threshold=ERROR
log4j.appender.stdlog.File=d:/error.log
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy/MM/dd HH:mm:ss} [%c{1}] - %m%n
log4j.appender.stdlog=org.apache.log4j.RollingFileAppender
log4j.appender.stdlog.Threshold=DEBUG,console
log4j.appender.stdlog.File=d:/debug.log
log4j.appender.stdlog.MaxFileSize=1024KB
log4j.appender.stdlog.MaxBackupIndex=3
log4j.appender.stdlog.layout=org.apache.log4j.PatternLayout
log4j.appender.stdlog.layout.ConversionPattern=%d{yyyy/MM/dd HH:mm:ss} %-5p [%c{1}] - %m%n
log4j.appender.errorlog=org.apache.log4j.RollingFileAppender
log4j.appender.errorlog.Threshold=WARN
log4j.appender.errorlog.File=d:/warn.log
log4j.appender.errorlog.MaxFileSize=1024KB
log4j.appender.errorlog.MaxBackupIndex=3
log4j.appender.errorlog.layout=org.apache.log4j.PatternLayout
log4j.appender.errorlog.layout.ConversionPattern=%d [%c{1}] - %m%n
3，具体代码:
Log4JLogger l = new Log4JLogger("log4j.properties"); //初始化日志驱动
l.logDebug("--->dug记录");
l.logError("日志正在记录...");
l.logInfo("消息记录中...");
try {
Log4JLogger ll = null;
ll.logDebug("---");
} catch (Exception e) {
l.logDebug(e, e.fillInStackTrace());
l.logError(e,e.fillInStackTrace());
}
4，保存的日志信息:
2013/01/24 16:51:03 ERROR [properties] - 日志正在记录...
2013/01/24 16:51:03 INFO [properties] - 消息记录中...
2013/01/24 16:51:03 DEBUG [properties] - java.lang.NullPointerException
java.lang.NullPointerException
at ddm.DataDriverManager.showSysInfo(DataDriverManager.java:47)
at ddm.DataDriverManager.main(DataDriverManager.java:20)
2013/01/24 16:51:03 ERROR [properties] - java.lang.NullPointerException
java.lang.NullPointerException
at ddm.DataDriverManager.showSysInfo(DataDriverManager.java:48)
at ddm.DataDriverManager.main(DataDriverManager.java:20)
5,大功高成！ 觉得可以的哥们儿希望给个好评！
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