Log4j，日志分包。

需求：将短信业务日志分在一个单独日志文件下，其他日志分在另一个日志文件下

web-xml 文件，配置监听器和配置文件位置

  <context-param>
        <param-name>webAppRootKey</param-name>
        <param-value>webFEP.root</param-value>
    </context-param>

    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:conf/log4j.xml</param-value>
    </context-param>
    
    <!--定义LOG4J监听器-->
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

 log4j.xml

<?xml version="1.0" encoding="utf-8"?>
<!--LOG4J CONFIGURATION - XML style -->
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">


    <!-- 输出到控制台中 -->
    <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
        <param name="Target" value="System.out"/>
        <layout class="org.apache.log4j.PatternLayout">
            <!-- The default pattern: Date Priority [Category] Message\n -->
            <param name="ConversionPattern" value="%d %-5p [%c{1}] (%t) %m%n"/>
        </layout>
    </appender>
    <!-- A time/date based rolling appender -->
    <appender name="FILE" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="${webFEP.root}/log/web-fep.log"/>
        <!-- 设置是否在重新启动服务时，在原有日志的基础添加新日志 -->
        <param name="Append" value="false"/>
        <!-- Rollover at midnight each day -->
        <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
        <param name="Threshold" value="TRACE"/>
        <!-- 设置输出文件项目和格式 -->
        <layout class="org.apache.log4j.PatternLayout">
            <!-- The default pattern: Date Priority [Category] Message\n -->
            <param name="ConversionPattern" value="%d %-5p [%c] (%t) %m%n"/>
            <!-- The full pattern: Date MS Priority [Category] (Thread:NDC) Message\n
           <param name="ConversionPattern" value="%d %-5r %-5p [%c] (%t:%x) %m%n"/>
            -->
        </layout>
    </appender>

    <appender name="SMS-APPENDER" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="${webFEP.root}/log/smslog/FEP_SMS.log"/>
        <!-- 设置是否在重新启动服务时，在原有日志的基础添加新日志 -->
        <param name="Append" value="false"/>
        <!-- Rollover at midnight each day -->
        <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
        <param name="Threshold" value="TRACE"/>
        <!-- 设置输出文件项目和格式 -->
        <layout class="org.apache.log4j.PatternLayout">
            <!-- The default pattern: Date Priority [Category] Message\n -->
            <param name="ConversionPattern" value="%d %-5p [%c] (%t) %m%n"/>
            <!-- The full pattern: Date MS Priority [Category] (Thread:NDC) Message\n
           <param name="ConversionPattern" value="%d %-5r %-5p [%c] (%t:%x) %m%n"/>
            -->
        </layout>
    </appender>


    <!--将各个包中的类日志输出到不同的日志文件中-->
    <category name="SMS">
        <level value="INFO"/>
        <appender-ref ref="CONSOLE" />
        <appender-ref ref="SMS-APPENDER" />
    </category>


    <root>
        <priority value="INFO"/>
        <appender-ref ref="FILE"/>
        <appender-ref ref="CONSOLE"/>
    </root>

</log4j:configuration>

最后：代码部分

	private static Logger log = LoggerFactory.getLogger("SMS");
	

	@PostConstruct
	public void testLog(){
		log.info("我是一条测试短信");
	}

日志位置输出：