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web app的Log4j应用
1 建立log.properties
log level定为INFO，不显示DEBUG信息。log输出依次为文件，控制台
log4j.rootLogger=INFO,R,CONSOLE
#DEBUG,CONSOLE
log4j.addivity.org.apache=true
###################
# Console Appender
###################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=DEBUG
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n
#####################
# File Appender，文件满100kb，自动生成file.log.n
#####################
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=d:\\file.log
log4j.appender.R.MaxFileSize=100KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=1
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
2 建立初始化Action Servlet
import com.nova.colimas.web.constants.*;
import org.apache.log4j.*;
public class StartupServlet extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception{
try{
//初始化log
initLog();
}catch(Exception e){
e.printStackTrace();
return mapping.findForward("failure");
}
Logger logger = Logger.getLogger(this.getClass());
logger.info("init log...");
}
private void initLog() throws Exception{
//获得log.properties绝对地址
java.net.URL myfile=this.getClass().getResource("/resources/log/properties");
//加载log配置文件log.properties
if(myfile.getPath()!=null)
PropertyConfigurator.configure(myfile.getPath());
else
throw new Exception("no log configure");
}
}
3 写log
public class LoginAction extends Action {
LoginContext loginContext=null;
LoginForm loginForm=null;
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception{
Logger logger = Logger.getLogger(this.getClass());
logger.info("login success");
return mapping.findForward("success");
}
}
log文件内容如下：
INFO http-8080-Processor24 com.nova.colimas.web.action.StartupServlet - init colimas...
INFO http-8080-Processor24 com.nova.colimas.web.action.StartupServlet - init security successfully
INFO http-8080-Processor24 com.nova.colimas.web.action.StartupServlet - init DAO successfully
INFO http-8080-Processor24 com.nova.colimas.web.action.LoginAction - login success
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