Table of Contents
1. Import dependencies
2.Write configuration
3.Use
4.Verification
5. Print error message
1. Import dependencies
<!-- logback, backward compatible with log4j, also supports SLF4J-->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
</dependency>
2. Write configuration
Including configuring color fonts, saving location, etc.
In the log storage path column, I set it to be stored in the log folder on the d drive.
The main file generates .log type, and info and error generate txt files.
<configuration scan="true" scanPeriod="60 seconds" debug="false">
<!-- Rendering classes that color logs depend on -->
<conversionRule conversionWord="clr" converterClass="org.springframework.boot.logging.logback.ColorConverter"/>
<conversionRule conversionWord="wex"
converterClass="org.springframework.boot.logging.logback.WhitespaceThrowableProxyConverter"/>
<conversionRule conversionWord="wEx"
converterClass="org.springframework.boot.logging.logback.ExtendedWhitespaceThrowableProxyConverter"/>
<!-- Log storage path -->
<property name="log.path" value="D:/log"/>
<!-- Log output format -->
<property name="log.pattern"
value="%clr(%d{${yyyy-MM-dd HH:mm:ss.SSS}}){faint} %clr([%X{mdcTraceId},%X{mdcTraceNum}]){magenta} % clr(${LOG_LEVEL_PATTERN:-%5p}) %clr(${PID:- }){magenta} %clr(- & amp;#45; & amp;#45;){faint} %clr([ .20t ]){faint} %clr(%-40.40logger{39}){cyan} : %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}"/>
<property name="file.log.pattern"
value="%d{${yyyy-MM-dd HH:mm:ss.SSS}} [%X{mdcTraceId},%X{mdcTraceNum}] ${LOG_LEVEL_PATTERN:-%5p} ${PID:- } - & amp;#45; & amp;#45; [ .15t] %-40.40logger{39} : %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}"/>
<!-- <springProperty scope="context" name="logFileName" source="spring.application.name" defaultValue="currentLog"/>-->
<!-- Console output -->
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>${log.pattern}</pattern>
<!-- Logging encoding: Set character set here - -->
<charset>UTF-8</charset>
</encoder>
</appender>
<!-- Global log output -->
<appender name="file_application" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.path}/application</file>
<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<fileNamePattern>${log.path}/application/application.%i</fileNamePattern>
<minIndex>1</minIndex>
<maxIndex>1</maxIndex>
</rollingPolicy>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<maxFileSize>5MB</maxFileSize>
</triggeringPolicy>
<encoder>
<pattern>${file.log.pattern}</pattern>
<!-- Logging encoding: Set character set here - -->
<charset>UTF-8</charset>
</encoder>
</appender>
<!-- System log output -->
<appender name="file_info" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.path}/info.txt</file>
<!-- Cycle policy: create log files based on time -->
<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
<!-- Log file name format -->
<fileNamePattern>${log.path}/info/%d{yyyy-MM-dd}-%i.txt</fileNamePattern>
<!--Maximum value for each file -->
<maxFileSize>10MB</maxFileSize>
<!-- Save logs for up to 30 days -->
<maxHistory>15</maxHistory>
<!-- Maximum limit -->
<totalSizeCap>20GB</totalSizeCap>
</rollingPolicy>
<encoder>
<pattern>${file.log.pattern}</pattern>
<!-- Logging encoding: Set character set here - -->
<charset>UTF-8</charset>
</encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<!-- Level of filtering -->
<level>INFO</level>
<!-- Operation when matching: receive (record) -->
<onMatch>ACCEPT</onMatch>
<!-- Action when there is no match: reject (do not log) -->
<onMismatch>DENY</onMismatch>
</filter>
</appender>
<appender name="file_error" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${log.path}/error.txt</file>
<!-- Cycle policy: create log files based on time -->
<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
<!-- Log file name format -->
<fileNamePattern>${log.path}/error/%d{yyyy-MM-dd}-%i.txt</fileNamePattern>
<!--Maximum value for each file -->
<maxFileSize>10MB</maxFileSize>
<!-- Save logs for up to 30 days -->
<maxHistory>15</maxHistory>
<!-- Maximum limit -->
<totalSizeCap>20GB</totalSizeCap>
</rollingPolicy>
<encoder>
<pattern>${file.log.pattern}</pattern>
<!-- Logging encoding: Set character set here - -->
<charset>UTF-8</charset>
</encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<!-- Level of filtering -->
<level>ERROR</level>
<!-- Operation when matching: receive (record) -->
<onMatch>ACCEPT</onMatch>
<!-- Action when there is no match: reject (do not record) -->
<onMismatch>DENY</onMismatch>
</filter>
</appender>
<!-- System module log level control -->
<logger name="com.org.sys" level="debug"/>
<!-- Spring log level control -->
<logger name="org.springframework" level="warn"/>
<logger name="com.zaxxer.hikari" level="warn"/>
<logger name="io.lettuce.core" level="warn"/>
<logger name="io.seata.core" level="warn"/>
<logger name="com.netflix.loadbalancer" level="warn"/>
<root level="info">
<appender-ref ref="console"/>
</root>
<!--System operation log-->
<root level="info">
<appender-ref ref="file_application"/>
<appender-ref ref="file_info"/>
<appender-ref ref="file_error"/>
</root>
</configuration>
3.Use
Two methods 1. Add annotations to the class 2. Create through LoggerFactory
It should be noted that the method of adding @Slf4j annotation to the class requires dependence on lombok, so the lombok dependency must be imported.
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
@RestController
@RequestMapping("/test")
@CrossOrigin
@Slf4j
public class TestController {
//Edit the xml configuration file. The controller layer indicates the use of printing and display through logger.info.
private static final Logger logger = LoggerFactory.getLogger(TestController.class);
@RepeatSubmit
@PostMapping("/test")
public String login() {
User user = new User();
user.setName("Logger");
log.info("Test the use of the annotation @Slf4j,{}",JSON.toJSONString(user));
logger.info("Print log information{}", JSON.toJSONString(user));
return "Hello, doPost method";
}
}
4.Verification
postman interface test
The log printed by the console
Logs saved in local log folder
5.Print error message
Use: log.error() or logger.error()
public String login() {
User user = new User();
user.setName("Logger");
log.info("Test the use of the annotation @Slf4j,{}",JSON.toJSONString(user));
logger.info("Print log information{}", JSON.toJSONString(user));
log.error("error message");
logger.error("error message");
return "Hello, doPost method";
}
Console printing
At this time, go to err.txt or application.log in the log folder.
error.txt
application.log
Difference: In general, err and info of application are stored according to classification.
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