Log4j日志配置记录

在项目中使用log4j，大致过程如下：

1.web.xml中配置对log4j配置文件的加载。如下

<context-param>

                   <param-name>logbackConfigLocation</param-name>

                   <param-value>file:${config.root}/logback.xml</param-value>

         </context-param>

或

<context-param>
　　<param-name>log4jConfigLocation</param-name>
　　<param-value>/WEB-INF/conf/log4j.xml</param-value>
</context-param>
<listener>
　　<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

2.代码中对log4j的使用，进行日志的打印。

有两种使用方式，一种是别名应用，一种是包引用。

别名使用就是在logback.xml配置文件中配置别名，然后在代码中引用别名，从而把日志打印到对应别名所在的目录下。如下：

protected static final Logger  logger = Logger.getLogger("quartz");

         包引用相对比较简单，在代码中只需要获得类的实例即可。日志的打印位置为logback.xml配置中对应包所在的路径。如下：

         private static final Logger logger = Logger.getLogger(PCITransferServiceImpl.class);

3.Logback.xml配置详解

3.1.别名配置：

打印日志的路径：

　　<appender name="EXT-INTEGRATION-P2P-APPENDER" class="ch.qos.logback.core.rolling.RollingFileAppender">

                   <encoder>UTF-8</encoder>

                   <file>/opt/logs/appserver/p2p/ext_integration_p2p.log</file>

                   <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

                            <fileNamePattern>/opt/logs/appserver/p2p/ext_integration_p2p.log.%d{yyyy-MM-dd}.%i</fileNamePattern>

                            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

                                     <!-- 当文件大小达到1GB时，会自动按照fileNamePattern规定格式生成新的日志文件 -->

                                     <maxFileSize>1GB</maxFileSize>

                            </timeBasedFileNamingAndTriggeringPolicy>

                   </rollingPolicy>

                   <layout class="ch.qos.logback.classic.PatternLayout">

                            <Pattern>[%date{yyyy-MM-ddHH:mm:ss}] %p %C %t %X{logPrefix}, %m%n</Pattern>

                   </layout>

         </appender>

别名对路径的引用，别名为quartz：

　　<logger name=" quartz " level="info" additivity="false">

                   <appender-ref ref=" EXT-INTEGRATION-P2P-APPENDER " />

                   <appender-ref ref="ERROR-P2P-APPENDER" />

         </logger>

日志都打印在ext_integration_p2p.log中。

3.2.包引用配置

         <appender name="CORE-SERVICE-P2P-APPENDER" class="ch.qos.logback.core.rolling.RollingFileAppender">

                   <encoder>UTF-8</encoder>

                   <file>/opt/logs/appserver/p2p/core_service_p2p.log</file>

                   <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

                            <fileNamePattern>/opt/logs/appserver/p2p/core_service_p2p.log.%d{yyyy-MM-dd}.%i</fileNamePattern>

                            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

                                     <!-- 当文件大小达到1GB时，会自动按照fileNamePattern规定格式生成新的日志文件 -->

                                     <maxFileSize>1GB</maxFileSize>

                            </timeBasedFileNamingAndTriggeringPolicy>

                   </rollingPolicy>

                   <layout class="ch.qos.logback.classic.PatternLayout">

                            <Pattern>[%date{yyyy-MM-ddHH:mm:ss}] %p %C %t %X{logPrefix}, %m%n</Pattern>

                   </layout>

         </appender>

对路径的引用：

　　<logger name="com.netfinworks.appserver.p2p" level="info" additivity="false">

                   <appender-ref ref="CORE-SERVICE-P2P-APPENDER" />

                   <appender-ref ref="ERROR-P2P-APPENDER" />

         </logger>

com.netfinworks.appserver.p2p下的日志都打印在core_service_p2p.log中。

错误日志配置：

         <appender name="ERROR-P2P-APPENDER" class="ch.qos.logback.core.rolling.RollingFileAppender">

                   <encoder>UTF-8</encoder>

                   <file>/opt/logs/appserver/p2p/error.log</file>

                   <filter class="ch.qos.logback.classic.filter.LevelFilter">  

                            <level>ERROR</level>

                            <onMatch>ACCEPT</onMatch>

                            <onMismatch>DENY</onMismatch>

                   </filter>

                   <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

                            <fileNamePattern>/opt/logs/appserver/p2p/error.log.%d{yyyy-MM-dd}.%i</fileNamePattern>

                            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

                                     <!-- 当文件大小达到1GB时，会自动按照fileNamePattern规定格式生成新的日志文件 -->

                                     <maxFileSize>1GB</maxFileSize>

                            </timeBasedFileNamingAndTriggeringPolicy>

                   </rollingPolicy>

                   <layout class="ch.qos.logback.classic.PatternLayout">

                            <Pattern>[%date{yyyy-MM-ddHH:mm:ss}] %p %C %t %X{logPrefix}, %m%n</Pattern>

                   </layout>

         </appender>

打印控制台日志配置：

　　<appender name="CONSOLE-APPENDER" class="ch.qos.logback.core.ConsoleAppender">

                   <encoder>UTF-8</encoder>

                   <layout class="ch.qos.logback.classic.PatternLayout">

                            <Pattern>[%date{yyyy-MM-ddHH:mm:ss}] %p %C %t %X{logPrefix}, %m%n</Pattern>

                   </layout>

         </appender>

引用配置：

　　<root level="info">

                   <appender-ref ref="DEFAULT-APPENDER" />

                   <appender-ref ref="ERROR-APPENDER" />

         </root>