什么是log4j的默认日志文件转储路径

问题描述

我是编程概念的新手，我倾向于用log4j来处理东西。所以我正在阅读Log4j教程，在那里我找到以下代码：

 包测试; 
 import org.apache.log4j.Logger; 
 import java.io. *; 
 import java.sql.SQLException; 
 
 
 public class Log4jExample {
 
 / *获取要打印在* / 
上的实际类名静态Logger log = Logger.getLogger（Log4jExample。 class.getName（））; 
 public static void main（String [] args）throws IOException，SQLException 
 {
 log.debug（Hello this is a debug message）; 
 log.info（Hello this is a info message）; 
} 
 
} 
  

但是在eclipse中运行无法找到生成的日志文件。任何人都可以告诉文件被转储在哪里？也帮助我一些最好的网站，从那里我可以从头开始学习Log4j和Java Doc。谢谢!!

解决方案

要将日志输出重定向到文件，您需要使用FileAppender并需要定义其他文件详细信息在你的log4j.properties/xml文件中。以下是相同的示例属性文件：

 ＃根记录器选项
 log4j.rootLogger = INFO，文件
 
＃将日志消息直接发送到日志文件
 log4j.appender.file = org.apache.log4j.RollingFileAppender 
 log4j.appender.file.File = C：\\ loging.log 
 log4j.appender.file.MaxFileSize = 1MB 
 log4j.appender.file.MaxBackupIndex = 1 
 log4j.appender.file.layout = org.apache.log4j.PatternLayout 
 log4j.appender.file.layout.ConversionPattern =％d {yyyy-MM-dd HH：mm：ss}％-5p％c {1}：％L  - ％m％n 
  

按照本教程了解有关log4j用法的更多信息：

Hi i am new to programming concepts and i am tend to work out something with log4j. So i am reading Log4j tutorials where i found the following code:

package test;
import org.apache.log4j.Logger;
import java.io.*;
import java.sql.SQLException;


public class Log4jExample {

    /* Get actual class name to be printed on */
        static Logger log = Logger.getLogger(Log4jExample.class.getName());
        public static void main(String[] args)throws IOException,SQLException
        {
            log.debug("Hello this is an debug message");
            log.info("Hello this is an info message");
        }

}

But after running this in eclipse i am not able to locate the generated log file. Can anybody tell where is the file being dumped? Also help me with some best sites wherefrom i can learn Log4j and Java Doc from the scratch. Thanks!!

解决方案

To redirect your logs output to a file, you need to use the FileAppender and need to define other file details in your log4j.properties/xml file. Here is a sample properties file for the same:

# Root logger option
log4j.rootLogger=INFO, file

# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C:\\loging.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

Follow this tutorial to learn more about log4j usage:

http://www.mkyong.com/logging/log4j-log4j-properties-examples/

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