对log4j初始化并设置log文件的存放路径

利用servlet初始化时配置log的存放位置

java 代码

package cn.feigme.util;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
/**
 * Feigme H.Guo
 */
public class Log4jInit extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private static Logger logger = Logger.getLogger(Log4jInit.class);

    public Log4jInit() {

    }

    public void init(ServletConfig config) throws ServletException {

        String prefix = config.getServletContext().getRealPath("/");
        String file = config.getInitParameter("log4j");
        String filePath = prefix + file;
        Properties props = new Properties();
        try {
            FileInputStream istream = new FileInputStream(filePath);
            props.load(istream);
            istream.close();
            String logFile = prefix + props.getProperty("log4j.appender.logfile.File");//设置路径
            props.setProperty("log4j.appender.logfile.File",logFile);
            PropertyConfigurator.configure(props);//装入log4j配置信息
            logger.info(logFile);
        } catch (IOException e) {
            logger.debug("Could not read configuration file [" + filePath + "].");
            logger.debug("Ignoring configuration file [" + filePath + "].");
            return;
        }
    }

}

相关配置

xml 代码

<!-- log4j config -->
     <servlet>
         <servlet-name>log4j-init</servlet-name>
         <servlet-class>cn.feigme.util.Log4jInit</servlet-class>
         <init-param>
             <param-name>log4j</param-name>
             <param-value>WEB-INF/classes/log4j.properties</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
     </servlet>
<!-- log4j config -->

log4j文件

java 代码

# For JBoss: Avoid to setup Log4J outside $JBOSS_HOME/server/default/deploy/log4j.xml!
# For all other servers: Comment out the Log4J listener in web.xml to activate Log4J.
log4j.rootLogger=INFO, stdout, logfile

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

log4j.appender.logfile=org.apache.log4j.RollingFileAppender
log4j.appender.logfile.File=cis.log
log4j.appender.logfile.MaxFileSize=1024KB
# Keep three backup files.
log4j.appender.logfile.MaxBackupIndex=3
# Pattern to output: date priority [category] - message
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

评论

1 楼 jaja_jaja 2011-07-24  

有错误，web.xml里少了servlet-mapping部分