一.日志打印的使用
1.日志对象初创建,在类中创建日志打印对象,类似在类中定义全局变量,如图1:
/**
* 日志
*/
private static final Log logger = LogFactory.getLog(_className);
图1
2.日志对象使用,在方法里面正常运行的代码块使用logger.info();,在try-catch捕获异常的catch模块使用logger.error();如图2。
图2
二.日志文件的生成输出
1.在application.properties配置文件下设置,如图3:
#打印日志文件
#logging.level.shortMessageService=debug
#日志生成方式效果配置文件
logging.config=classpath:logback.xml
# 默认该目录下会生成spring.log logging.file.path 和 logging.file.name 2选1,如果都配置,以后者为准
logging.file.path=logs
#日志文件路径(默认在项目根目录)
#logging.file.name=./logs/my-project.logs
图3
2.在resources目录下放logback.xml日志生成文件,如图 4:
图 4
logback.xml内容:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<include resource="org/springframework/boot/logging/logback/base.xml"/>
<logger name="org.springframework.web" level="debug"/>
<!-- 定义日志文件 输入位置 -->
<property name="logDir" value="logs" />
<!-- 日志最大的历史 30天 -->
<property name="maxHistory" value="30"/>
<!-- 控制台输出日志 -->
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger -%msg%n</pattern>
<charset class="java.nio.charset.Charset">UTF-8</charset>
</encoder>
</appender>
<!-- ERROR级别日志 -->
<appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
<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>${logDir}\%d{yyyyMMdd}\error.log</fileNamePattern>
<maxHistory>${maxHistory}</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
<charset class="java.nio.charset.Charset">UTF-8</charset>
</encoder>
<append>false</append>
<prudent>false</prudent>
</appender>
<!-- WARN级别日志 -->
<appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>WARN</level>
<onMatch>ACCEPT</onMatch>
<onMismatch>DENY</onMismatch>
</filter>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${logDir}\%d{yyyyMMdd}\warn.log</fileNamePattern>
<maxHistory>${maxHistory}</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
<charset class="java.nio.charset.Charset">UTF-8</charset>
</encoder>
<append>false</append>
<prudent>false</prudent>
</appender>
<!-- INFO级别日志 -->
<appender name="INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>INFO</level>
<onMatch>ACCEPT</onMatch>
<onMismatch>DENY</onMismatch>
</filter>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${logDir}\%d{yyyyMMdd}\info.log</fileNamePattern>
<maxHistory>${maxHistory}</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
<charset class="java.nio.charset.Charset">UTF-8</charset>
</encoder>
<append>false</append>
<prudent>false</prudent>
</appender>
<!-- DEBUG级别日志 -->
<appender name="DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>DEBUG</level>
<onMatch>ACCEPT</onMatch>
<onMismatch>DENY</onMismatch>
</filter>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${logDir}\%d{yyyyMMdd}\debug.log</fileNamePattern>
<maxHistory>${maxHistory}</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
<charset class="java.nio.charset.Charset">UTF-8</charset>
</encoder>
<append>false</append>
<prudent>false</prudent>
</appender>
<!-- root级别 DEBUG -->
<root level="INFO">
<!-- 控制台输出 -->
<appender-ref ref="STDOUT" />
<!-- 文件输出 -->
<appender-ref ref="ERROR" />
<appender-ref ref="INFO" />
<appender-ref ref="WARN" />
<appender-ref ref="DEBUG" />
</root>
</configuration>
在我们项目启动后,我们就可以看到日志文件生成的位置,如图5:
图5
最后,本文记录博主的开发历程,也供大家参考,有何不足之处请大家批评指正,谢谢大家(狗头保命)。