logback系列之四：输出日志到不同文件

logback系列之一：输出日志到控制台
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

logback系列之四：输出日志到不同文件

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