JAVA日志-使用log4j

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1. log4j.jar下載

windows下載地址：

http://www.apache.org/dyn/closer.cgi/logging/log4j/1.2.15/apache-log4j-1.2.15.zip

?Linux平臺下的下載地址：

http://download.chinaunix.net/download.php?id=12696&ResourceID=6256

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把log4j.jar加入到工程中。

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2.為log4j編寫配置文件

寫一個log4j.properties,里面內容為:

log4j.rootCategory=INFO,file
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern='.'yyyy-MM-dd
log4j.appender.file.File=run.log
log4j.appender.file.Append=true
log4j.appender.file.Threshold=INFO
log4j.appender.file.layout=org.apache.log4j.PatternLayout

log4j.appender.file.layout.ConversionPattern=%c %x - %m%n

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3. 編寫測試代碼

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?1package?Log4jTest;
?2
?3import?org.apache.log4j.*;
?4
?5public?class?TestLog4j?{
?6????static?Logger?logger?=?Logger.getLogger(TestLog4j.class);
?7
?8????public?static?void?main(String?arg[])?{
?9????????//BasicConfigurator.configure();
10????????PropertyConfigurator.configure("log4j.properties");
11????????//?Set?the?logger?level?to?Level.INFO
12????????Logger?logger?=?Logger.getLogger(TestLog4j.class);
13????????logger.setLevel(Level.INFO);
14????????//?This?request?will?be?disabled?since?Level.DEBUG?<?Level.INFO.
15????????//DateFormat?a?=?new?SimpleDateFormat();
16????????//String?b?=?a.format(System.currentTimeMillis());
17????????long?lStart?=?System.currentTimeMillis();
18????
19????????for(int?i=0;?i<10000*10000;?i++){
20????????????int?n?=0;
21????????}
22????????
23????????long?lEnd?=?System.currentTimeMillis();
24????????
25????????long?lTime?=?lEnd?-?lStart;
26????????
27????????logger.debug(lTime?+?"This?is?debug.");
28
29????????//?These?requests?will?be?enabled.
30????????logger.info(lTime?+?"This?is?an?info.");
31????????logger.warn(lTime?+?"This?is?a?warning.");
32????????logger.error(lTime?+?"This?is?an?error.");
33????????logger.fatal(lTime?+?"This?is?a?fatal?error.");
34????????return;
35????}
36}
37

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轉載于:https://www.cnblogs.com/zhangqingping/archive/2009/03/24/1420805.html

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