系统日志分类别输出至日志文件[Log4j应用]

 在项目的开发过程中，系统对日志的要求很细，而且要求分类清楚。所以还是采用了Log4J。

      在强调可重用组件开发的今天，除了自己从头到尾开发一个可重用的日志操作类外，Apache为我们提供了一个强有力的日志操作包-Log4j。

      Log4j是Apache的一个开放源代码项目，通过使用Log4j，我们可以控制日志信息输送的目的地是控制台、文件、GUI组件、甚至是套接口服务器、NT的事件记录器、UNIX Syslog守护进程等；我们也可以控制每一条日志的输出格式；通过定义每一条日志信息的级别，我们能够更加细致地控制日志的生成过程。最令人感兴趣的就是，这些可以通过一个配置文件来灵活地进行配置，而不需要修改应用的代码。

      此外，通过Log4j其他语言接口，您可以在C、php、C++、.Net、PL/SQL程序中使用Log4j，其语法和用法与在Java程序中一样，使得多语言分布式系统得到一个统一一致的日志组件模块。而且，通过使用各种第三方扩展，您可以很方便地将Log4j集成到J2EE、JINI甚至是SNMP应用中。

      Log4j配置文件详细说明（*.properties和*.xml）
      
属性文件Properties

properties属性文件

编号 配置项 配置项描述 示例
1 log4j.threshold 阈值项 log4j.threshold = error
2 log4j.rootLogger 根日志属性项 log4j.rootLogger = info,stdout1,stdout2
3 log4j.category. 子日志属性项（旧） log4j.category.com.eos = NULL,stdout1
4 log4j.logger. 子日志属性项（新） log4j.logger.com.eos.log = debug,stdout2
5 log4j.additivity. appender是否继承设置 log4j.additivity.com.eos = false
6 log4j.appender. 输出目的地定义项 log4j.appender.stdout2 = org.apache.log4j.ConsoleAppender
7 log4j.appender.A.layout 输出格式定义项 log4j.appender.stdout2.layout = org.apache.log4j.PatternLayout

xml文件

编号 配置项 配置项描述 示例
1 threshold 阈值项 <configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false" threshold="null"><br> 2 root 根日志属性项 <root><br>      <priority value="info"></priority><br>      <appender-ref ref="CONSOLE"></appender-ref><br>    </root><br> 3 priority 级别项（旧） <priority value="info"></priority><br> 4 level 级别项（新） <level value="info"></level><br> 5 category 子日志属性项（旧） <category name="com.eos.log" additivity="true"><br> 6 logger 子日志属性项（新） <logger name="com.eos" additivity="true"><br> 7 appender-ref 输出端控制项 <appender-ref ref="CONSOLE"></appender-ref><br> 8 additivity appender是否继承设置 <logger name="com.eos" additivity="true"><br> 9 appender 输出目的地定义项 <appender class="org.apache.log4j.ConsoleAppender" name="CONSOLE"><br> 10 layout 输出格式定义项 <layout class="org.apache.log4j.PatternLayout"><br><br><strong>详细说明（只针对Log4j常用的，用户可以自定义）Appender</strong><br> Appender继承关系<br> Appender基本种类<br> org.apache.log4j.ConsoleAppender（控制台）<br> org.apache.log4j.FileAppender（文件）<br> org.apache.log4j.DailyRollingFileAppender（每天产生一个日志文件）<br> org.apache.log4j.RollingFileAppender（文件大小到达指定尺寸的时候产生一个新的文件）<br> org.apache.log4j.WriterAppender（将日志信息以流格式发送到任意指定的地方）<br> · ConsoleAppender选项<br> Threshold=WARN:指定日志消息的输出最低层次。<br> ImmediateFlush=true:默认值是true,意谓着所有的消息都会被立即输出。<br> Target=System.err：默认情况下是：System.out,指定输出控制台<br> · FileAppender 选项<br> Threshold=WARN:指定日志消息的输出最低层次。<br> ImmediateFlush=true:默认值是true,意谓着所有的消息都会被立即输出。<br> File=mylog.txt:指定消息输出到mylog.txt文件。<br> Append=false:默认值是true,即将消息增加到指定文件中，false指将消息覆盖指定的文件内容。<br> · DailyRollingFileAppender 选项<br> Threshold=WARN:指定日志消息的输出最低层次。<br> ImmediateFlush=true:默认值是true,意谓着所有的消息都会被立即输出。<br> File=mylog.txt:指定消息输出到mylog.txt文件。<br> Append=false:默认值是true,即将消息增加到指定文件中，false指将消息覆盖指定的文件内容。<br> DatePattern='.'yyyy-ww:每周滚动一次文件，即每周产生一个新的文件。当然也可以指定按月、周、<br> 天、时和分。即对应的格式如下：<br> 1)'.'yyyy-MM: 每月<br> 2)'.'yyyy-ww: 每周<br> 3)'.'yyyy-MM-dd: 每天<br> 4)'.'yyyy-MM-dd-a: 每天两次<br> 5)'.'yyyy-MM-dd-HH: 每小时<br> 6)'.'yyyy-MM-dd-HH-mm: 每分钟<br> n RollingFileAppender 选项<br> Threshold=WARN:指定日志消息的输出最低层次。<br> ImmediateFlush=true:默认值是true,意谓着所有的消息都会被立即输出。<br> File=mylog.txt:指定消息输出到mylog.txt文件。<br> Append=false:默认值是true,即将消息增加到指定文件中，false指将消息覆盖指定的文件内容。<br> MaxFileSize=100KB: 后缀可以是KB, MB 或者是 GB. 在日志文件到达该大小时，将会自动滚动，即将原来<br> 的内容移到mylog.log.1文件。<br> MaxBackupIndex=2:指定可以产生的滚动文件的最大数。 <br><br><strong>详细说明（只针对Log4j，用户可以自定义）Layout</strong><br> Log4j的Layout基本种类<br> org.apache.log4j.HTMLLayout（以HTML表格形式布局），<br> org.apache.log4j.PatternLayout（可以灵活地指定布局模式），<br> org.apache.log4j.SimpleLayout（包含日志信息的级别和信息字符串），<br> org.apache.log4j.TTCCLayout（包含日志产生的时间、线程、类别等等信息）<br> · HTMLLayout选项<br> LocationInfo=true:默认值是false,输出java文件名称和行号<br> Title=my app file: 默认值是 Log4J Log Messages.       <br> n PatternLayout 选项<br> log4j.appender.A1.layout.ConversionPattern=%-4r %-5p %d{yyyy-MM-dd HH:mm:ssS} %c %m%n<br> 这里需要说明的就是日志信息格式中几个符号所代表的含义：<br><br> %X: 信息输出时左对齐；<br> %p: 输出日志信息优先级，即DEBUG，INFO，WARN，ERROR，FATAL,<br> %d: 输出日志时间点的日期或时间，默认格式为ISO8601，也可以在其后指定格式，比如：%d{yyy MMM dd HH:mm:ss,SSS}，输出类似：2002年10月18日 22：10：28，921<br> %r: 输出自应用启动到输出该log信息耗费的毫秒数<br> %c: 输出日志信息所属的类目，通常就是所在类的全名<br> %t: 输出产生该日志事件的线程名<br> %l: 输出日志事件的发生位置，相当于%C.%M(%F:%L)的组合,包括类目名、发生的线程，以及在代码中的行数。举例：Testlog4.main(TestLog4.java:10)<br> %x: 输出和当前线程相关联的NDC(嵌套诊断环境),尤其用到像java servlets这样的多客户多线程的应用中。<br> %%: 输出一个"%"字符<br> %F: 输出日志消息产生时所在的文件名称<br> %L: 输出代码中的行号<br> %m: 输出代码中指定的消息,产生的日志具体信息<br> %n: 输出一个回车换行符，Windows平台为"\r\n"，Unix平台为"\n"输出日志信息换行，可以在%与模式字符之间加上修饰符来控制其最小宽度、最大宽度、和文本的对齐方式。如：<br> 1)%20c：指定输出category的名称，最小的宽度是20，如果category的名称小于20的话，默认的情况下右对齐。<br> 2)%-20c:指定输出category的名称，最小的宽度是20，如果category的名称小于20的话，"-"号指定左对齐。<br> 3)%.30c:指定输出category的名称，最大的宽度是30，如果category的名称大于30的话，就会将左边多出的字符截掉，但小于30的话也不会有空格。<br> 4)%20.30c:如果category的名称小于20就补空格，并且右对齐，如果其名称长于30字符， 就从左边交远销出的字符截掉。<br> · XMLLayout 选项<br> LocationInfo=true:默认值是false,输出java文件和行号<br><br><strong>日志配置文件内容范例</strong>   <br> log4j.properties<br><br><div class="dp-highlighter"> <div class="bar"> <div class="tools"> <a onclick="dp.sh.Toolbar.Command('ViewSource',this);return false;" href="http://www.icnote.com/#">view plain</a><a onclick="dp.sh.Toolbar.Command('CopyToClipboard',this);return false;" href="http://www.icnote.com/#">copy to clipboard</a><a onclick="dp.sh.Toolbar.Command('PrintSource',this);return false;" href="http://www.icnote.com/#">print</a><a onclick="dp.sh.Toolbar.Command('About',this);return false;" href="http://www.icnote.com/#">?</a> </div> </div> <ol class="dp-j"> <li class="alt"> <span><span>log4j.rootLogger=DEBUG, CONSOLE    </span></span> </li> <li class=""> <span>#DEBUG, CONSOLE,FILE,ROLLING_FILE,MAIL,DATABASE    </span> </li> <li class="alt"> <span style="background-color: yellow">#log4j.threshold=WARN</span> </li> <li class="alt"> </li> <li class=""> <span style="background-color: yellow">log4j.logger.org.apache=INFO, FILE </span> </li> <li class="alt"> <span><span style="background-color: yellow">log4j.additivity.org.apache=<span class="keyword">false</span></span></span><span>    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>###################    </span> </li> <li class=""> <span># Console Appender    </span> </li> <li class="alt"> <span>###################    </span> </li> <li class=""> <span>log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender    </span> </li> <li class="alt"> <span><span style="background-color: yellow">log4j.appender.Threshold=DEBUG   </span> </span> </li> <li class=""> <span>log4j.appender.CONSOLE.Target=System.out    </span> </li> <li class="alt"> <span>log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout    </span> </li> <li class=""> <span>log4j.appender.CONSOLE.layout.ConversionPattern=%d [%p] - %m%n    </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>#####################    </span> </li> <li class=""> <span># File Appender    </span> </li> <li class="alt"> <span>#####################    </span> </li> <li class=""> <span>log4j.appender.FILE=org.apache.log4j.FileAppender    </span> </li> <li class="alt"> <span>log4j.appender.FILE.File=file.log    </span> </li> <li class=""> <span>log4j.appender.FILE.Append=</span><span class="keyword">false</span><span>    </span> </li> <li class="alt"> <span>log4j.appender.FILE.layout=org.apache.log4j.PatternLayout    </span> </li> <li class=""> <span>log4j.appender.FILE.layout.ConversionPattern=%d [%p] - %m%n    </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>########################    </span> </li> <li class=""> <span># Rolling File    </span> </li> <li class="alt"> <span>########################    </span> </li> <li class=""> <span>log4j.appender.ROLLING_FILE=org.apache.log4j.RollingFileAppender    </span> </li> <li class="alt"> <span>log4j.appender.ROLLING_FILE.Threshold=ERROR    </span> </li> <li class=""> <span>log4j.appender.ROLLING_FILE.File=rolling.log    </span> </li> <li class="alt"> <span>log4j.appender.ROLLING_FILE.Append=</span><span class="keyword">true</span><span>    </span> </li> <li class=""> <span>log4j.appender.ROLLING_FILE.MaxFileSize=10KB    </span> </li> <li class="alt"> <span>log4j.appender.ROLLING_FILE.MaxBackupIndex=</span><span class="number">1</span><span>    </span> </li> <li class=""> <span>log4j.appender.ROLLING_FILE.layout=org.apache.log4j.PatternLayout    </span> </li> <li class="alt"> <span>log4j.appender.ROLLING_FILE.layout.ConversionPattern=%d [%p] - %m%n    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>####################    </span> </li> <li class="alt"> <span># Socket Appender    </span> </li> <li class=""> <span>####################    </span> </li> <li class="alt"> <span>log4j.appender.SOCKET=org.apache.log4j.RollingFileAppender    </span> </li> <li class=""> <span>log4j.appender.SOCKET.RemoteHost=localhost    </span> </li> <li class="alt"> <span>log4j.appender.SOCKET.Port=</span><span class="number">5001</span><span>    </span> </li> <li class=""> <span>log4j.appender.SOCKET.LocationInfo=</span><span class="keyword">true</span><span>    </span> </li> <li class="alt"> <span># Set up </span><span class="keyword">for</span><span> Log Facter </span><span class="number">5</span><span>    </span> </li> <li class=""> <span>log4j.appender.SOCKET.layout=org.apache.log4j.PatternLayout    </span> </li> <li class="alt"> <span>log4j.appender.SOCET.layout.ConversionPattern=%d [%p] - %m%n    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>########################    </span> </li> <li class="alt"> <span># Log Factor </span><span class="number">5</span><span> Appender    </span> </li> <li class=""> <span>########################    </span> </li> <li class="alt"> <span>log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender    </span> </li> <li class=""> <span>log4j.appender.LF5_APPENDER.MaxNumberOfRecords=</span><span class="number">2000</span><span>    </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>########################    </span> </li> <li class=""> <span># SMTP Appender    </span> </li> <li class="alt"> <span>#######################    </span> </li> <li class=""> <span>log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender    </span> </li> <li class="alt"> <span>log4j.appender.MAIL.Threshold=FATAL    </span> </li> <li class=""> <span>log4j.appender.MAIL.BufferSize=</span><span class="number">10</span><span>    </span> </li> <li class="alt"> <span>log4j.appender.MAIL.From=wuyh</span><span class="annotation">@primeton</span><span>.com    </span> </li> <li class=""> <span>log4j.appender.MAIL.SMTPHost=mail.primeton.com    </span> </li> <li class="alt"> <span>log4j.appender.MAIL.Subject=Log4J Message    </span> </li> <li class=""> <span>log4j.appender.MAIL.To=test</span><span class="annotation">@primeton</span><span>.com    </span> </li> <li class="alt"> <span>log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout    </span> </li> <li class=""> <span>log4j.appender.MAIL.layout.ConversionPattern=%d [%p] - %m%n    </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>########################    </span> </li> <li class=""> <span># JDBC Appender    </span> </li> <li class="alt"> <span>#######################    </span> </li> <li class=""> <span>log4j.appender.DATABASE=org.apache.log4j.jdbc.JDBCAppender    </span> </li> <li class="alt"> <span>log4j.appender.DATABASE.URL=jdbc:mysql:</span><span class="comment">//localhost:3306/test  </span><span>  </span> </li> <li class=""> <span>log4j.appender.DATABASE.driver=com.mysql.jdbc.Driver    </span> </li> <li class="alt"> <span>log4j.appender.DATABASE.user=root    </span> </li> <li class=""> <span>log4j.appender.DATABASE.password=    </span> </li> <li class="alt"> <span>log4j.appender.DATABASE.sql=INSERT INTO LOG4J (Message) VALUES (%d [%p] - %m%n)    </span> </li> <li class=""> <span>log4j.appender.DATABASE.layout=org.apache.log4j.PatternLayout    </span> </li> <li class="alt"> <span>log4j.appender.DATABASE.layout.ConversionPattern=%d [%p] - %m%n    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender    </span> </li> <li class="alt"> <span>log4j.appender.A1.File=SampleMessages.log4j    </span> </li> <li class=""> <span>log4j.appender.A1.DatePattern=yyyyMMdd-HH</span><span class="string">'.log4j'</span><span>    </span> </li> <li class="alt"> <span>log4j.appender.A1.layout=org.apache.log4j.xml.XMLLayout    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>###################    </span> </li> <li class=""> <span>#自定义Appender    </span> </li> <li class="alt"> <span>###################    </span> </li> <li class=""> <span>log4j.appender.im = net.cybercorlin.util.logger.appender.IMAppender    </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>log4j.appender.im.host = mail.cybercorlin.net    </span> </li> <li class="alt"> <span>log4j.appender.im.username = username    </span> </li> <li class=""> <span>log4j.appender.im.password = password    </span> </li> <li class="alt"> <span>log4j.appender.im.recipient = wuyh</span><span class="annotation">@primeton</span><span>.com    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>log4j.appender.im.layout=org.apache.log4j.PatternLayout    </span> </li> <li class=""> <span>log4j.appender.im.layout.ConversionPattern =%d [%p] - %m%n   </span> </li> </ol> </div> <textarea class="java" style="display: none" name="code" rows="15" cols="100">log4j.rootLogger=DEBUG, CONSOLE #DEBUG, CONSOLE,FILE,ROLLING_FILE,MAIL,DATABASE log4j.logger.org.apache=INFO, FILE log4j.additivity.org.apache=false ################### # Console Appender ################### log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.Threshold=DEBUG log4j.appender.CONSOLE.Target=System.out log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern=%d [%p] - %m%n ##################### # File Appender ##################### log4j.appender.FILE=org.apache.log4j.FileAppender log4j.appender.FILE.File=file.log log4j.appender.FILE.Append=false log4j.appender.FILE.layout=org.apache.log4j.PatternLayout log4j.appender.FILE.layout.ConversionPattern=%d [%p] - %m%n ######################## # Rolling File ######################## log4j.appender.ROLLING_FILE=org.apache.log4j.RollingFileAppender log4j.appender.ROLLING_FILE.Threshold=ERROR log4j.appender.ROLLING_FILE.File=rolling.log log4j.appender.ROLLING_FILE.Append=true log4j.appender.ROLLING_FILE.MaxFileSize=10KB log4j.appender.ROLLING_FILE.MaxBackupIndex=1 log4j.appender.ROLLING_FILE.layout=org.apache.log4j.PatternLayout log4j.appender.ROLLING_FILE.layout.ConversionPattern=%d [%p] - %m%n #################### # Socket Appender #################### log4j.appender.SOCKET=org.apache.log4j.RollingFileAppender log4j.appender.SOCKET.RemoteHost=localhost log4j.appender.SOCKET.Port=5001 log4j.appender.SOCKET.LocationInfo=true # Set up for Log Facter 5 log4j.appender.SOCKET.layout=org.apache.log4j.PatternLayout log4j.appender.SOCET.layout.ConversionPattern=%d [%p] - %m%n ######################## # Log Factor 5 Appender ######################## log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender log4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000 ######################## # SMTP Appender ####################### log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender log4j.appender.MAIL.Threshold=FATAL log4j.appender.MAIL.BufferSize=10 log4j.appender.MAIL.From=[e-mail] log4j.appender.MAIL.SMTPHost=mail.primeton.com log4j.appender.MAIL.Subject=Log4J Message log4j.appender.MAIL.To=[e-mail] log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout log4j.appender.MAIL.layout.ConversionPattern=%d [%p] - %m%n ######################## # JDBC Appender ####################### log4j.appender.DATABASE=org.apache.log4j.jdbc.JDBCAppender log4j.appender.DATABASE.URL=jdbc:mysql://localhost:3306/test log4j.appender.DATABASE.driver=com.mysql.jdbc.Driver log4j.appender.DATABASE.user=root log4j.appender.DATABASE.password= log4j.appender.DATABASE.sql=INSERT INTO LOG4J (Message) VALUES (%d [%p] - %m%n) log4j.appender.DATABASE.layout=org.apache.log4j.PatternLayout log4j.appender.DATABASE.layout.ConversionPattern=%d [%p] - %m%n log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender log4j.appender.A1.File=SampleMessages.log4j log4j.appender.A1.DatePattern=yyyyMMdd-HH'.log4j' log4j.appender.A1.layout=org.apache.log4j.xml.XMLLayout ################### #自定义Appender ################### log4j.appender.im = net.cybercorlin.util.logger.appender.IMAppender log4j.appender.im.host = mail.cybercorlin.net log4j.appender.im.username = username log4j.appender.im.password = password log4j.appender.im.recipient = [e-mail] log4j.appender.im.layout=org.apache.log4j.PatternLayout log4j.appender.im.layout.ConversionPattern =%d [%p] - %m%n </textarea><br><br> #注意：在属性配置文件中，属性值的第一个一定是级别，输出端可有可无，以逗号分割。（而xml文件格式没有这种限制）<br><br> log4j.xml<br><div class="dp-highlighter"> <div class="bar"> <div class="tools"> <a onclick="dp.sh.Toolbar.Command('ViewSource',this);return false;" href="http://www.icnote.com/#">view plain</a><a onclick="dp.sh.Toolbar.Command('CopyToClipboard',this);return false;" href="http://www.icnote.com/#">copy to clipboard</a><a onclick="dp.sh.Toolbar.Command('PrintSource',this);return false;" href="http://www.icnote.com/#">print</a><a onclick="dp.sh.Toolbar.Command('About',this);return false;" href="http://www.icnote.com/#">?</a> </div> </div> <ol class="dp-j"> <li class="alt"> <span><span>&lt; xml version=</span><span class="string">"1.0"</span><span> encoding=</span><span class="string">"UTF-8"</span><span> &gt;    </span></span> </li> <li class=""> <span>&lt;!DOCTYPE log4j:configuration SYSTEM </span><span class="string">"log4j.dtd"</span><span>&gt;    </span> </li> <li class="alt"> <span>&lt;log4j:configuration xmlns:log4j=</span><span class="string">"http://jakarta.apache.org/log4j/"</span><span> debug=</span><span class="string">"false"</span><span> threshold=</span><span class="string">"null"</span><span>&gt;    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>&lt;appender </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.ConsoleAppender"</span><span> name=</span><span class="string">"CONSOLE"</span><span>&gt;    </span> </li> <li class="alt"> <span>&lt;param name=</span><span class="string">"Target"</span><span> value=</span><span class="string">"System.out"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;param name=</span><span class="string">"Threshold"</span><span> value=</span><span class="string">"INFO"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;layout </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.PatternLayout"</span><span>&gt;    </span> </li> <li class=""> <span>&lt;param name=</span><span class="string">"ConversionPattern"</span><span> value=</span><span class="string">"%d [%p] - %m%n "</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;/layout&gt;    </span> </li> <li class=""> <span>&lt;filter </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.varia.DenyAllFilter"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;errorHandler </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.varia. FallbackErrorHandler"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;/appender&gt;    </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>&lt;appender </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.FileAppender"</span><span> name=</span><span class="string">"FILE"</span><span>&gt;    </span> </li> <li class="alt"> <span>&lt;param name=</span><span class="string">"File"</span><span> value=</span><span class="string">"file.log"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;param name=</span><span class="string">"Append"</span><span> value=</span><span class="string">"false"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;param name=</span><span class="string">"Threshold"</span><span> value=</span><span class="string">"INFO"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;layout </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.PatternLayout"</span><span>&gt;    </span> </li> <li class="alt"> <span>&lt;param name=</span><span class="string">"ConversionPattern"</span><span> value=</span><span class="string">"%d [%p] - %m%n "</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;/layout&gt;    </span> </li> <li class="alt"> <span>&lt;/appender&gt;    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>&lt;appender </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.RollingFileAppender"</span><span> name=</span><span class="string">"ROLLING_FILE"</span><span>&gt;    </span> </li> <li class=""> <span>&lt;param name=</span><span class="string">"Threshold"</span><span> value=</span><span class="string">"INFO"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;param name=</span><span class="string">"File"</span><span> value=</span><span class="string">"rolling.log"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;param name=</span><span class="string">"Append"</span><span> value=</span><span class="string">"false"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;param name=</span><span class="string">"MaxFileSize"</span><span> value=</span><span class="string">"10KB"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;param name=</span><span class="string">"MaxBackupIndex"</span><span> value=</span><span class="string">"1"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;layout </span><span class="keyword">class</span><span>=</span><span class="string">"org.apache.log4j.PatternLayout"</span><span>&gt;    </span> </li> <li class=""> <span>&lt;param name=</span><span class="string">"ConversionPattern"</span><span> value=</span><span class="string">"%d [%p] - %m%n "</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;/layout&gt;    </span> </li> <li class=""> <span>&lt;/appender&gt;    </span> </li> <li class="alt"> <span>  </span> </li> <li class=""> <span>&lt;logger additivity=</span><span class="string">"false"</span><span> name=</span><span class="string">"com.eos"</span><span>&gt;    </span> </li> <li class="alt"> <span>&lt;level value=</span><span class="string">"info"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;appender-ref ref=</span><span class="string">"CONSOLE"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;/logger&gt;    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>&lt;category additivity=</span><span class="string">"true"</span><span> name=</span><span class="string">"com.eos.log"</span><span>&gt;    </span> </li> <li class=""> <span>&lt;priority value=</span><span class="string">"warn"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;/category&gt;    </span> </li> <li class=""> <span>  </span> </li> <li class="alt"> <span>&lt;root&gt;    </span> </li> <li class=""> <span>&lt;priority value=</span><span class="string">"info"</span><span>/&gt;    </span> </li> <li class="alt"> <span>&lt;appender-ref ref=</span><span class="string">"CONSOLE"</span><span>/&gt;    </span> </li> <li class=""> <span>&lt;/root&gt;    </span> </li> <li class="alt"> <span>&lt;/log4j:configuration&gt;   </span> </li> </ol> </div> <textarea class="java" style="display: none" name="code" rows="15" cols="100">&lt; xml version="1.0" encoding="UTF-8" &gt; &lt;!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"&gt; &lt;log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false" threshold="null"&gt; &lt;appender class="org.apache.log4j.ConsoleAppender" name="CONSOLE"&gt; &lt;param name="Target" value="System.out"/&gt; &lt;param name="Threshold" value="INFO"/&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%d [%p] - %m%n "/&gt; &lt;/layout&gt; &lt;filter class="org.apache.log4j.varia.DenyAllFilter"/&gt; &lt;errorHandler class="org.apache.log4j.varia. FallbackErrorHandler"/&gt; &lt;/appender&gt; &lt;appender class="org.apache.log4j.FileAppender" name="FILE"&gt; &lt;param name="File" value="file.log"/&gt; &lt;param name="Append" value="false"/&gt; &lt;param name="Threshold" value="INFO"/&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%d [%p] - %m%n "/&gt; &lt;/layout&gt; &lt;/appender&gt; &lt;appender class="org.apache.log4j.RollingFileAppender" name="ROLLING_FILE"&gt; &lt;param name="Threshold" value="INFO"/&gt; &lt;param name="File" value="rolling.log"/&gt; &lt;param name="Append" value="false"/&gt; &lt;param name="MaxFileSize" value="10KB"/&gt; &lt;param name="MaxBackupIndex" value="1"/&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%d [%p] - %m%n "/&gt; &lt;/layout&gt; &lt;/appender&gt; &lt;logger additivity="false" name="com.eos"&gt; &lt;level value="info"/&gt; &lt;appender-ref ref="CONSOLE"/&gt; &lt;/logger&gt; &lt;category additivity="true" name="com.eos.log"&gt; &lt;priority value="warn"/&gt; &lt;/category&gt; &lt;root&gt; &lt;priority value="info"/&gt; &lt;appender-ref ref="CONSOLE"/&gt; &lt;/root&gt; &lt;/log4j:configuration&gt; </textarea><br></layout></appender></logger></logger></category></configuration>