Log4j日志文件输出为相对路径的解决方法
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方法一:将日志文件输出到tomcat自身的日志文件夹logs中
# console is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=info
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=- %m%n
# R is set to be a File appender using a PatternLayout.
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.Append=true
log4j.appender.R.Threshold=info
log4j.appender.R.MaxFileSize=1024KB
log4j.appender.R.MaxBackupIndex=10
log4j.appender.R.File=../logs/abc.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} [%c]-[%p] %m%n
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=info
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=- %m%n
# R is set to be a File appender using a PatternLayout.
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.Append=true
log4j.appender.R.Threshold=info
log4j.appender.R.MaxFileSize=1024KB
log4j.appender.R.MaxBackupIndex=10
log4j.appender.R.File=../logs/abc.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} [%c]-[%p] %m%n
方法二:将日志文件输出到自己程序WEB-INF\logs目录中
11.<servlet>
22. <servlet-name>lo4jInit</servlet-name>
33. <servlet-class>com.linder.util.log4j.init.Lo4jInit</servlet-class>
44. <init-param>
55. <param-name>log4j_init_path</param-name>
66. <param-value>WEB-INF\classes\log4j.properties</param-value>
77. </init-param>
88. <init-param>
99. <param-name>log4j_file_path</param-name>
1010. <param-value>WEB-INF\logs\</param-value>
1111. </init-param>
1212. <load-on-startup>0</load-on-startup>
1313. </servlet>
14
22. <servlet-name>lo4jInit</servlet-name>
33. <servlet-class>com.linder.util.log4j.init.Lo4jInit</servlet-class>
44. <init-param>
55. <param-name>log4j_init_path</param-name>
66. <param-value>WEB-INF\classes\log4j.properties</param-value>
77. </init-param>
88. <init-param>
99. <param-name>log4j_file_path</param-name>
1010. <param-value>WEB-INF\logs\</param-value>
1111. </init-param>
1212. <load-on-startup>0</load-on-startup>
1313. </servlet>
14
2、编写一个初始化log4j的Servlet
1.package com.linder.util.log4j.init;
2.
3.import java.io.FileInputStream;
4.import java.io.IOException;
5.import java.util.Properties;
6.
7.import javax.servlet.ServletException;
8.import javax.servlet.http.HttpServlet;
9.import javax.servlet.http.HttpServletRequest;
10.import javax.servlet.http.HttpServletResponse;
11.
12.import org.apache.log4j.Logger;
13.import org.apache.log4j.PropertyConfigurator;
14.
15.
16.public class Lo4jInit extends HttpServlet {
17.
18. /**
19. *
20. */
21. private static final long serialVersionUID = 1L;
22. private static Logger logger=Logger.getLogger(Lo4jInit.class);
23.
24. public void init(){
25. String path=this.getServletContext().getRealPath("/");
26. String file=this.getInitParameter("log4j_init_path");
27. String logFile=this.getInitParameter("log4j_file_path");
28. if(file!=null)
29. {
30. Properties prop = new Properties();
31. try{
32. prop.load(new FileInputStream(path+file)); //加载log4j.properties
33. prop.setProperty("log4j.appender.R.File", path+logFile+ prop.getProperty("log4j.appender.R.File")); //设置日志文件的输出路径
34. PropertyConfigurator.configure(prop); //加载配置项
35. }catch(Exception e)
36. {
37. logger.info("初始化log4j日志输入路径异常,请检查web.xml参数配置是否正常,异常发生在"+this.getClass().getName()+"类的public void init()方法,异常的愿意是:"+e.getMessage(), e.fillInStackTrace());
38. }
39. }
40.
41.
42. }
43. protected void service(HttpServletRequest request, HttpServletResponse response)
44. throws ServletException, IOException {
45.
46. }
47.
48.}
2.
3.import java.io.FileInputStream;
4.import java.io.IOException;
5.import java.util.Properties;
6.
7.import javax.servlet.ServletException;
8.import javax.servlet.http.HttpServlet;
9.import javax.servlet.http.HttpServletRequest;
10.import javax.servlet.http.HttpServletResponse;
11.
12.import org.apache.log4j.Logger;
13.import org.apache.log4j.PropertyConfigurator;
14.
15.
16.public class Lo4jInit extends HttpServlet {
17.
18. /**
19. *
20. */
21. private static final long serialVersionUID = 1L;
22. private static Logger logger=Logger.getLogger(Lo4jInit.class);
23.
24. public void init(){
25. String path=this.getServletContext().getRealPath("/");
26. String file=this.getInitParameter("log4j_init_path");
27. String logFile=this.getInitParameter("log4j_file_path");
28. if(file!=null)
29. {
30. Properties prop = new Properties();
31. try{
32. prop.load(new FileInputStream(path+file)); //加载log4j.properties
33. prop.setProperty("log4j.appender.R.File", path+logFile+ prop.getProperty("log4j.appender.R.File")); //设置日志文件的输出路径
34. PropertyConfigurator.configure(prop); //加载配置项
35. }catch(Exception e)
36. {
37. logger.info("初始化log4j日志输入路径异常,请检查web.xml参数配置是否正常,异常发生在"+this.getClass().getName()+"类的public void init()方法,异常的愿意是:"+e.getMessage(), e.fillInStackTrace());
38. }
39. }
40.
41.
42. }
43. protected void service(HttpServletRequest request, HttpServletResponse response)
44. throws ServletException, IOException {
45.
46. }
47.
48.}
3、log4j.properties的配置信息
1.# Set root category priority to info and its only appender to console.
2.log4j.rootCategory=info,console,R
3.#log4j.debug=true
4.
5.# console is set to be a ConsoleAppender using a PatternLayout.
6.log4j.appender.console=org.apache.log4j.ConsoleAppender
7.log4j.appender.console.Threshold=info
8.log4j.appender.console.layout=org.apache.log4j.PatternLayout
9.log4j.appender.console.layout.ConversionPattern=- %m%n
10.
11.# R is set to be a File appender using a PatternLayout.
12.log4j.appender.R=org.apache.log4j.RollingFileAppender
13.log4j.appender.R.Append=true
14.log4j.appender.R.Threshold=info
15.log4j.appender.R.MaxFileSize=1024KB
16.log4j.appender.R.MaxBackupIndex=10
17.log4j.appender.R.File=abc.log
18.log4j.appender.R.layout=org.apache.log4j.PatternLayout
19.log4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} [%c]-[%p] %m%n
2.log4j.rootCategory=info,console,R
3.#log4j.debug=true
4.
5.# console is set to be a ConsoleAppender using a PatternLayout.
6.log4j.appender.console=org.apache.log4j.ConsoleAppender
7.log4j.appender.console.Threshold=info
8.log4j.appender.console.layout=org.apache.log4j.PatternLayout
9.log4j.appender.console.layout.ConversionPattern=- %m%n
10.
11.# R is set to be a File appender using a PatternLayout.
12.log4j.appender.R=org.apache.log4j.RollingFileAppender
13.log4j.appender.R.Append=true
14.log4j.appender.R.Threshold=info
15.log4j.appender.R.MaxFileSize=1024KB
16.log4j.appender.R.MaxBackupIndex=10
17.log4j.appender.R.File=abc.log
18.log4j.appender.R.layout=org.apache.log4j.PatternLayout
19.log4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} [%c]-[%p] %m%n
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