1、输出到控制台
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration debug="true" xmlns:log4j='http://jakarta.apache.org/log4j/'> <appender name="console" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" /> </layout> </appender> <root> <level value="DEBUG" /> <appender-ref ref="console" /> </root> </log4j:configuration>
2、输出到文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration debug="true" xmlns:log4j='http://jakarta.apache.org/log4j/'> <appender name="file" class="org.apache.log4j.RollingFileAppender"> <param name="append" value="false" /> <param name="maxFileSize" value="10KB" /> <param name="maxBackupIndex" value="5" /> <!-- For Tomcat --> <param name="file" value="${catalina.home}/logs/myStruts1App.log" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" /> </layout> </appender> <root> <level value="ERROR" /> <appender-ref ref="file" /> </root> </log4j:configuration>
3、输出到控制台和文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration debug="true" xmlns:log4j='http://jakarta.apache.org/log4j/'> <appender name="console" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" /> </layout> </appender> <appender name="file" class="org.apache.log4j.RollingFileAppender"> <param name="append" value="false" /> <param name="maxFileSize" value="10MB" /> <param name="maxBackupIndex" value="10" /> <param name="file" value="${catalina.home}/logs/myStruts1App.log" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" /> </layout> </appender> <root> <level value="DEBUG" /> <appender-ref ref="console" /> <appender-ref ref="file" /> </root> </log4j:configuration>