log4j 路径环境变量配置和log4j加载配置-白红宇

log4j 路径环境变量配置和log4j加载配置

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发布时间：2019-06-15

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1.lo4j日志路径从环境变量读取，log4j.xml配置如下：

具体配置如下：log4j.appender.R.Encoding=UTF-8log4j.appender.R=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.R.Append=true#log4j.appender.R.Threshold=INFOlog4j.appender.R.File=${log4j.home}/logs/log.loglog4j.appender.R.DatePattern='.'yyyy-MM-ddlog4j.appender.R.layout=org.apache.log4j.PatternLayoutlog4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} [%c]-[%p] %m%n

1.1 监听配置web.xml


           
      
       com.jumper.logview.servlet.Log4jlistener

1.2 监听代码

public class Log4jlistener implements ServletContextListener {    final static String LOG4J_HOME = "log4j.home";    final static String ENV_HOME = "LOG4J_HOME";            public void contextDestroyed(ServletContextEvent servletcontextevent) {        System.getProperties().remove(LOG4J_HOME);    }        public void contextInitialized(ServletContextEvent servletcontextevent) {        String logsHome = System.getenv(ENV_HOME);        if(logsHome == null){            logsHome = System.getProperty("catalina.home")+"/log4j";        }System.out.println("*********log4j dir:"+logsHome);                System.setProperty(LOG4J_HOME, logsHome);    }}

2.log4j　加载的两种方式

2.1采用spring加载配置


             
      
       log4jConfigLocation
              
      
       /WEB-INF/classes/config/log4j.properties
          
         
         
             
      
       log4jRefreshInterval
              
      
       1000000
          
         
             
      
       org.springframework.web.util.Log4jConfigListener

２.２采用serlvet加载

import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import org.apache.log4j.PropertyConfigurator;public class Log4jInit extends HttpServlet {    private static final long serialVersionUID = 1L;    public void destroy() {        super.destroy();    }    public Log4jInit() {        super();    }    /**     * Initialization of the servlet. 
     *      * @throws ServletException     *             if an error occurs     */    public void init() throws ServletException {        String file = this.getInitParameter("log4j");// 从web.xml配置读取，名字一定要和web.xml配置一致        if (file != null) {            PropertyConfigurator.configure(this.getServletContext().getRealPath(file));                }    }}web.xml配置：
       
      
       Log4jInit
        
      
       com.jumper.log4j.Log4jInit
        
         
       
        log4j
       //这个是名字是下边路径配置的标识（好像KEY一样）   
       
        /WEB-INF/classes/config/log4j.properties
       //这是容器初始化时候加载log4j配置文件的路径（这好像一个value）;  
        
      
       1