5.6. Spring boot with Logging

一般的日志需求可以通过配置 application.properties实现，如果仍不能满足可以使用 logback.xml 配置日志。

logging.file=target/spring.log
logging.config=classpath:logback.xml

5.6.1. 打印日志

日志的用法，首先开发中我们根据实际的需要打印不同级别的日志。

package cn.netkiller.web;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;@Controller
public class TestController {private static final Logger log = LoggerFactory.getLogger(TestController.class);@RequestMapping("/test/log")@ResponseBodypublic String log() {String message = "Test";log.debug(message);log.info(message);log.warn(message);log.error(message);log.trace(message);return message;}
}

然后通过application.properties配置那些需要显示，那些不需要，以及显示的级别是什么。

5.6.2. 日志输出级别

显示所有DEBUG信息

              logging.level.root=DEBUG

仅仅显示 springframework 调试信息

              logging.level.org.springframework.web=DEBUG

仅仅显示 cn.netkiller.web.TestController 调试信息

               private static final Logger log = LoggerFactory.getLogger(TestController.class);log.debug(message);logging.level.cn.netkiller.web.TestController=DEBUG

5.6.3. 禁止控制台输出日志

禁止控制台日志输出，同时将日志写入日志文件.

src/main/resources/application.properties

logging.path=/tmp
logging.file=/tmp/spring.log
logging.level.root=INFO
logging.level.org.springframework.web=DEBUG
logging.level.org.hibernate=ERROR

src/main/resources/logback.xml

$ cat src/main/resources/logback.xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration><include resource="org/springframework/boot/logging/logback/defaults.xml" /><include resource="org/springframework/boot/logging/logback/file-appender.xml" /><root level="INFO"><appender-ref ref="FILE" /></root>
</configuration>

使用 java -jar project-version-xxx.jar 启动后控制不会再输出日志

5.6.4. 标准输出

<?xml version="1.0" encoding="UTF-8"?>
<configuration><include resource="org/springframework/boot/logging/logback/defaults.xml" /><include resource="org/springframework/boot/logging/logback/file-appender.xml" /><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>%date{yyyy-MM-dd HH:mm:ss} %-4relative [%thread] %-5level %logger{35} : %msg %n</pattern></encoder></appender><root level="INFO"><appender-ref ref="STDOUT" /><appender-ref ref="FILE" /></root>
</configuration>

5.6.5. 日志分割

按日期分割文件

<?xml version="1.0" encoding="UTF-8"?>
<configuration><include resource="org/springframework/boot/logging/logback/defaults.xml" /><include resource="org/springframework/boot/logging/logback/file-appender.xml" /><appender name="dailyRollingFileAppender" class="ch.qos.logback.core.rolling.RollingFileAppender"><File>logs/spring.log</File><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><!-- daily rollover --><FileNamePattern>spring.%d{yyyy-MM-dd}.log</FileNamePattern><!-- keep 30 days' worth of history --><maxHistory>60</maxHistory>         </rollingPolicy><encoder><Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg %n</Pattern></encoder>
</appender><root level="INFO"><appender-ref ref="FILE" /><appender-ref ref="dailyRollingFileAppender" />   </root>
</configuration>

通过级别分割日志将 info, error, debug 分割到指定文件中。

<configuration scan="true" scanPeriod="10 seconds"><!-- 控制台日志输出--><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>%d %p (%file:%line\)- %m%n</pattern><charset>UTF-8</charset></encoder></appender><!-- info日志输出--><appender name="INFO_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"><encoder><pattern>%d %p (%file:%line\)- %m%n</pattern><charset>UTF-8</charset></encoder><filter class="ch.qos.logback.classic.filter.ThresholdFilter"><level>INFO</level></filter><File>${LOG_PATH}/www.netkiller.cn.info.log</File><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><fileNamePattern>${LOG_PATH}/www.netkiller.cn.info-%d{yyyyMMdd}.log.%i</fileNamePattern><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>10MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy><maxHistory>30</maxHistory></rollingPolicy><layout class="ch.qos.logback.classic.PatternLayout"><Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} -%msg%n</Pattern></layout></appender><!-- debug 日志输出--><appender name="DEBUG_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"><encoder><pattern>%d %p (%file:%line\)- %m%n</pattern><charset>UTF-8</charset></encoder><filter class="ch.qos.logback.classic.filter.ThresholdFilter"><level>DEBUG</level></filter><File>${LOG_PATH}/www.netkiller.cn.debug.log</File><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><fileNamePattern>${LOG_PATH}/www.netkiller.cn.debug-%d{yyyyMMdd}.log.%i</fileNamePattern><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>10MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy><maxHistory>30</maxHistory></rollingPolicy><layout class="ch.qos.logback.classic.PatternLayout"><Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} -%msg%n</Pattern></layout></appender><!--error 日志输出配置 --><appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"><encoder><pattern>%d %p (%file:%line\)- %m%n</pattern><charset>UTF-8</charset></encoder><filter class="ch.qos.logback.classic.filter.ThresholdFilter"><level>ERROR</level></filter><File>${LOG_PATH}/www.netkiller.cn.error.log</File><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><fileNamePattern>${LOG_PATH}/www.netkiller.cn.error-%d{yyyyMMdd}.log.%i</fileNamePattern><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>10MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy><maxHistory>30</maxHistory></rollingPolicy><layout class="ch.qos.logback.classic.PatternLayout"><Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} -%msg%n</Pattern></layout></appender><root level="DEBUG"><!--<appender-ref ref="STDOUT" /><appender-ref ref="INFO_FILE" /><appender-ref ref="ERROR_FILE" /><appender-ref ref="DEBUG_FILE" />--><appender-ref ref="ERROR_FILE" /><appender-ref ref="INFO_FILE" /><appender-ref ref="DEBUG_FILE" /></root></configuration>

5.6.6. 日志写入 MongoDB

原文出处：Netkiller 系列手札
本文作者：陈景峯
转载请与作者联系，同时请务必标明文章原始出处和作者信息及本声明。

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