logback系列之二:输出日志到文件
logback系列之三:输出日志到文件(滚动)
logback系列之四:输出日志到不同文件
为了方便查看和归档:
不同包的日志可能要放到不同的文件中,如service层和dao层的日志;
不同日志级别:调试、信息、警告和错误等也要分文件输出。
一、根据包输出,通过logger的name属性指定不同的包
1. 创建不同包下的两个类:
package com.john.service; @Service public class ObligationService { static final Logger log = LoggerFactory.getLogger(ObligationService.class); @Resource ObligationDao dao; public void obligate() { log.debug("obligate start..."); dao.queryObligations(); log.error("An error occurred during the progress"); log.debug("obligate end..."); } }
package com.john.dao; @Repository public class ObligationDao { static final Logger log = LoggerFactory.getLogger(ObligationDao.class); public void queryObligations() { log.debug("query obligations start..."); log.error("An error occurred during the query"); log.debug("query obligations end..."); } }
2. 在logback(-test).xml中添加:
<appender name="serviceAppender" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>/logs/bribery.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>/logs/bribery-%d{yyyy-MM-dd}.log</fileNamePattern> </rollingPolicy> <encoder> <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{5} - %msg%n</pattern> </encoder> </appender> <appender name="daoAppender" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>/logs/venality.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>/logs/venality-%d{yyyy-MM-dd}.log</fileNamePattern> </rollingPolicy> <encoder> <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{5} - %msg%n</pattern> </encoder> </appender> <logger name="com.john.service" level="DEBUG" additivity="false"> <appender-ref ref="serviceAppender" /> </logger> <logger name="com.john.dao" level="DEBUG" additivity="false"> <appender-ref ref="daoAppender" /> </logger>
在类路径下创建Spring的beans.xml文件:(beans节点省略)
<context:component-scan base-package="com.john" />
3. 测试方法:
@Test public void dispatchByPackageTest() { AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); ObligationService service = ctx.getBean(ObligationService.class); service.obligate(); }
执行测试后,
bribery.log:
15:59:59.839 [main] DEBUG c.j.s.ObligationService - obligate start...
15:59:59.844 [main] ERROR c.j.s.ObligationService - An error occurred during the progress
15:59:59.844 [main] DEBUG c.j.s.ObligationService - obligate end...
venality.log:
15:59:59.844 [main] DEBUG c.j.d.ObligationDao - query obligations start...
15:59:59.844 [main] ERROR c.j.d.ObligationDao - An error occurred during the query
15:59:59.844 [main] DEBUG c.j.d.ObligationDao - query obligations end...
二、根据日志级别输出
这里把所有级别为ERROR的日志输出到一个文件中
1. 修改logback(-test).xml文件
serviceAppender和daoAppender都加入以下 级别过滤器,这样错误日志就不会在bribery.log和venality.log中打印了:
<filter class="ch.qos.logback.classic.filter.LevelFilter"> <level>ERROR</level> <onMatch>DENY</onMatch> <onMismatch>ACCEPT</onMismatch> </filter>
新建一个错误日志的appender:
<appender name="errorAppender" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>/logs/error.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>/logs/venality-%d{yyyy-MM-dd}.log</fileNamePattern> </rollingPolicy> <encoder> <pattern>%d{HH:mm:ss.SSS} %thread %X{invokeNo} %logger{40} %msg%n</pattern> </encoder> <filter class="ch.qos.logback.classic.filter.LevelFilter"><!-- 只打印错误日志 --> <level>ERROR</level> <onMatch>ACCEPT</onMatch> <onMismatch>DENY</onMismatch> </filter> </appender>
name为com.john.dao和com.john.service的logger都加上errorAppender:
<appender-ref ref="errorAppender" />
2. 执行上面的测试方法,service和dao的错误日志都打印到error.log文件中了:
16:12:51,433 main com.john.dao.ObligationDao An error occurred during the query
16:12:51,433 main com.john.service.ObligationService An error occurred during the progress