Log4J的配置

Log4J的配置

在web.xml文件中添加

     < servlet-name > log4j </ servlet-name >
     < servlet-class > com.log4j.Log4jInit </ servlet-class >
     < init-param >
     < param-name > log4j </ param-name >
     < param-value > /WEB-INF/log4j.properties </ param-value >
     </ init-param >
     < load-on-startup > 1 </ load-on-startup >
     </ servlet >     

com.log4j.Log4jInit需要自己写，貌似新版log4J已经不带初始化文件了

import  org.apache.log4j. * ;
import  javax.servlet.http.HttpServlet;
import  javax.servlet.http.HttpServletRequest;
import  javax.servlet.http.HttpServletResponse;
public   class  Log4jInit  extends  HttpServlet  {
    /** *//**
     * 
     */
    private static final long serialVersionUID = 1L;
    public void init() {
        String prefix =  getServletContext().getRealPath("/");
        String file = getInitParameter("log4j");
        // if the log4j-init-file is not set, then no point in trying
        System.out.println(".log4j start");
        if(file != null) 
        {
            PropertyConfigurator.configure(prefix+file);
            System.out.println(prefix+file);
        }
    }
    public void doGet(HttpServletRequest req, HttpServletResponse res) {
    }
}

普通应用程序中的Log4jInit

public   class  Log4jInit  {
    private static final long serialVersionUID = 1L;
    public static void main(String[] args) {
        PropertyConfigurator.configure("/src/log4j.properties");
    }

}

log4j.properties文件，放到WEB-INF目录下，具体每个参数是什么意思，查一下参考文档

log4j.rootLogger = debug ,  stdout ,  R

log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern = %5p  [ %t ]  (%F:%L) - %m%n

log4j.appender.R = org.apache.log4j.RollingFileAppender
log4j.appender.R.File = example.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

#log4j.appender.R  =  org.apache.log4j.RollingFileAppender
#log4j.appender.R.File  =  logs\\test.log
#log4j.appender.R.MaxFileSize  =  1MB
#log4j.appender.R.MaxBackupIndex  =   3
#log4j.appender.R.layout  =  org.apache.log4j.PatternLayout
#log4j.appender.R.layout.ConversionPattern  = [ %d ]  %-4r  [ %t ]  %-5p %c %x - %m %n

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