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,CONSOLElog4j.addivity.org.apache=true #################### Console Appender###################log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppenderlog4j.appender.Threshold=DEBUGlog4j.appender.CONSOLE.Target=System.outlog4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayoutlog4j.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.RollingFileAppenderlog4j.appender.R.File=d:\\file.loglog4j.appender.R.MaxFileSize=100KB# Keep one backup filelog4j.appender.R.MaxBackupIndex=1log4j.appender.R.layout=org.apache.log4j.PatternLayoutlog4j.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.propertiesif(myfile.getPath()!=null) PropertyConfigurator.configure(myfile.getPath());elsethrow new Exception("no log configure"); }}
3 写log
ublic 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 successfullyINFO http-8080-Processor24 com.nova.colimas.web.action.StartupServlet - init DAO successfullyINFO http-8080-Processor24 com.nova.colimas.web.action.LoginAction - login success