log4j 日志文件路径

servlet:

package com.charmyin.test;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.PropertyConfigurator;

public class Log4jInitServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    private final String WEB_APP_ROOT_DEFAULT = "webapp.root";

    public void init() throws ServletException {
        String prefix = getServletContext().getRealPath("/");
        // System.setProperty("webapp.root", prefix);
        String webAppRootKey = getServletConfig().getInitParameter(
                "webAppRootKey");
        System.out.println(webAppRootKey);
        if (webAppRootKey == null || webAppRootKey.length() < 1) {
            webAppRootKey = WEB_APP_ROOT_DEFAULT;
        }
        System.setProperty(webAppRootKey, prefix);

        String propfile = getServletConfig().getInitParameter(
                "log4j-configuration");
        System.out.println(propfile);
        if (propfile != null) {
            PropertyConfigurator.configure(prefix + propfile);
            System.out.println("Log4J Configured.");
        }
    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // TODO Method stub generated by Lomboz
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // TODO Method stub generated by Lomboz
    }
}

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>http</display-name>
  <servlet>
    <servlet-name>Log4jInit</servlet-name>
    <servlet-class>com.charmyin.test.Log4jInitServlet</servlet-class>
    <init-param>
      <param-name>log4j-configuration</param-name>
      <param-value>/WEB-INF/log4j.properties</param-value>
    </init-param>
    <init-param>
      <param-name>webAppRootKey</param-name>
      <param-value>webapp.root</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
  </servlet>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

log4j.properties:

# initialise root logger with level DEBUG 
log4j.rootLogger=DEBUG, CONSOLE, LOGFILE
log4j.logger.com.mchange=OFF  

#log4j.appender.stdout = org.apache.log4j.ConsoleAppender
#log4j.appender.stdout.Target = System.out
#log4j.appender.stdout.Threshold=ALL 
#log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
#log4j.appender.stdout.layout.ConversionPattern =[%-6p] [%d{yyyy-MM-dd HH/:mm/:ss}]%-5p %c(line/:%L) %x-%m%n

#u8F93u51FAu5230u63A7u5236u53F0
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender 
log4j.appender.CONSOLE.Threshold=DEBUG 
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout 
log4j.appender.CONSOLE.layout.ConversionPattern=[%-6p] %d{yyyy-MM-dd HH:mm:ss,SSS} %l%n %m%n

#u8F93u51FAu5230u6587u4EF6
log4j.appender.LOGFILE=org.apache.log4j.DailyRollingFileAppender 
log4j.appender.LOGFILE.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.Threshold=DEBUG
log4j.appender.LOGFILE.File=${webapp.root}/http.log
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern= [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method: %l%n %m%n