log4j 日志文件路径

servlet:

 1 package com.charmyin.test;

 2 

 3 import java.io.IOException;

 4 

 5 import javax.servlet.ServletConfig;

 6 import javax.servlet.ServletException;

 7 import javax.servlet.annotation.WebServlet;

 8 import javax.servlet.http.HttpServlet;

 9 import javax.servlet.http.HttpServletRequest;

10 import javax.servlet.http.HttpServletResponse;

11 

12 import org.apache.log4j.PropertyConfigurator;

13 

14 public class Log4jInitServlet extends HttpServlet {

15     private static final long serialVersionUID = 1L;

16 

17     private final String WEB_APP_ROOT_DEFAULT = "webapp.root";

18 

19     public void init() throws ServletException {

20         String prefix = getServletContext().getRealPath("/");

21         // System.setProperty("webapp.root", prefix);

22         String webAppRootKey = getServletConfig().getInitParameter(

23                 "webAppRootKey");

24         System.out.println(webAppRootKey);

25         if (webAppRootKey == null || webAppRootKey.length() < 1) {

26             webAppRootKey = WEB_APP_ROOT_DEFAULT;

27         }

28         System.setProperty(webAppRootKey, prefix);

29 

30         String propfile = getServletConfig().getInitParameter(

31                 "log4j-configuration");

32         System.out.println(propfile);

33         if (propfile != null) {

34             PropertyConfigurator.configure(prefix + propfile);

35             System.out.println("Log4J Configured.");

36         }

37     }

38 

39     protected void doGet(HttpServletRequest request,

40             HttpServletResponse response) throws ServletException, IOException {

41         // TODO Method stub generated by Lomboz

42     }

43 

44     protected void doPost(HttpServletRequest request,

45             HttpServletResponse response) throws ServletException, IOException {

46         // TODO Method stub generated by Lomboz

47     }

48 }

web.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>

 2 <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">

 3   <display-name>http</display-name>

 4   <servlet>

 5     <servlet-name>Log4jInit</servlet-name>

 6     <servlet-class>com.charmyin.test.Log4jInitServlet</servlet-class>

 7     <init-param>

 8       <param-name>log4j-configuration</param-name>

 9       <param-value>/WEB-INF/log4j.properties</param-value>

10     </init-param>

11     <init-param>

12       <param-name>webAppRootKey</param-name>

13       <param-value>webapp.root</param-value>

14     </init-param>

15     <load-on-startup>0</load-on-startup>

16   </servlet>

17   <welcome-file-list>

18     <welcome-file>index.html</welcome-file>

19     <welcome-file>index.htm</welcome-file>

20     <welcome-file>index.jsp</welcome-file>

21     <welcome-file>default.html</welcome-file>

22     <welcome-file>default.htm</welcome-file>

23     <welcome-file>default.jsp</welcome-file>

24   </welcome-file-list>

25 </web-app>

log4j.properties:

 1 # initialise root logger with level DEBUG 

 2 log4j.rootLogger=DEBUG, CONSOLE, LOGFILE

 3 log4j.logger.com.mchange=OFF  

 4 

 5 #log4j.appender.stdout = org.apache.log4j.ConsoleAppender

 6 #log4j.appender.stdout.Target = System.out

 7 #log4j.appender.stdout.Threshold=ALL 

 8 #log4j.appender.stdout.layout = org.apache.log4j.PatternLayout

 9 #log4j.appender.stdout.layout.ConversionPattern =[%-6p] [%d{yyyy-MM-dd HH/:mm/:ss}]%-5p %c(line/:%L) %x-%m%n

10 

11 #\u8F93\u51FA\u5230\u63A7\u5236\u53F0

12 log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender 

13 log4j.appender.CONSOLE.Threshold=DEBUG 

14 log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout 

15 log4j.appender.CONSOLE.layout.ConversionPattern=[%-6p] %d{yyyy-MM-dd HH:mm:ss,SSS} %l%n %m%n

16 

17 #\u8F93\u51FA\u5230\u6587\u4EF6

18 log4j.appender.LOGFILE=org.apache.log4j.DailyRollingFileAppender 

19 log4j.appender.LOGFILE.DatePattern='.'yyyy-MM-dd'.log'

20 log4j.appender.LOGFILE.Append=true

21 log4j.appender.LOGFILE.Threshold=DEBUG

22 log4j.appender.LOGFILE.File=${webapp.root}/http.log

23 log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout

24 log4j.appender.LOGFILE.layout.ConversionPattern= [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method: %l%n %m%n