解密Log4j、SLF4J、Common-logging的区别

本文对比了slf4j与commons-logging两种日志门面库的特点及使用方式,阐述了它们如何结合log4j进行日志记录,并提供了具体的实现案例。

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前面有一篇日志中简单的介绍了 log4j,同时也介绍了它与commons-logging的关系,但是突然冒出来一个slf4j,并且slf4j有取代commons-logging的趋势,所以,我们可以推知slf4j与commons-logging的作用应该

相差不大的。 好,下面开始先讲讲slf4j。
1.slf4j
 他只提供一个核心slf4j api(就是slf4j-api.jar包),这个包只有日志的接口,并没有实现,所以如果要使用就得再给它提供一个实现了些接口的日志包,比 如:log4j,common logging,jdk log日志实现包等,但是这些日志实现又不能通过接口直接调用,实现上他们根本就和slf4j-api不一致,因此slf4j又增加了一层来转换各日志实 现包的使用,当然slf4j-simple除外。
 
slf4j+log4j组合使用模式:
1. slf4j-api-1.5.11.jar
2. slf4j-log4j12-1.5.11.jar
3. log4j-1.2.15.jar
4. log4j.properties(也可以是 log4j.xml)
 
JCL+Log4J组合使用模式(即commons-logging+log4j):
1. commons-logging-1.1.jar
2. log4j-1.2.15.jar
3. log4j.properties
 
2.不同的获取logger的方式
log4j:
import org.apache.log4j.Logger;
Logger logger= Logger.getLogger(xx.class);
 
slf4j+log4j:
import  org.slf4j.Logger;
import  org.slf4j.LoggerFactory;
Logger logger = LoggerFactory.getLogger(xx.class);
 
jcl+log4j:
import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory;
private static Log log = LogFactory.getLog(xx.class);

注意:common-longing是默认支持log4j的,使用其他日志工具需要做下面的配置:common-logging.properties
        org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JCategoryLog
 
3.总结
 
总的来说,slf4j与commons-logging只是一个日志门面,实际还是要依赖真正的日志库log4j,虽然slf4j和commons-loggins自带了日志库,但是毕竟log4j才是最强大的。
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com.ruoyi.auth.RuoYiAuthApplication 14:26:55.068 [main] INFO c.a.n.c.e.SearchableProperties - [sortPropertySourceDefaultOrder,197] - properties search order:PROPERTIES->JVM->ENV->DEFAULT_SETTING 14:26:55.094 [background-preinit] DEBUG org.jboss.logging - [logProvider,152] - Logging Provider: org.jboss.logging.Log4j2LoggerProvider 14:26:55.094 [background-preinit] INFO o.h.v.i.util.Version - [<clinit>,21] - HV000001: Hibernate Validator 6.2.5.Final 14:26:55.099 [background-preinit] DEBUG o.h.v.i.x.c.ValidationXmlParser - [getValidationXmlInputStream,120] - Trying to load META-INF/validation.xml for XML based Validator configuration. 14:26:55.100 [background-preinit] DEBUG o.h.v.i.x.c.ResourceLoaderHelper - [getResettableInputStreamForPath,60] - Trying to load META-INF/validation.xml via TCCL 14:26:55.101 [background-preinit] DEBUG o.h.v.i.x.c.ResourceLoaderHelper - [getResettableInputStreamForPath,66] - Trying to load META-INF/validation.xml via Hibernate Validator's class loader 14:26:55.101 [background-preinit] DEBUG o.h.v.i.x.c.ValidationXmlParser - [getValidationXmlInputStream,127] - No META-INF/validation.xml found. Using annotation based configuration only. 14:26:55.103 [background-preinit] DEBUG o.h.v.i.e.r.TraversableResolvers - [getDefault,60] - Cannot find javax.persistence.Persistence on classpath. Assuming non JPA 2 environment. All properties will per default be traversable. 14:26:55.116 [background-preinit] DEBUG o.h.v.m.ResourceBundleMessageInterpolator - [buildExpressionFactory,172] - Loaded expression factory via original TCCL 14:26:55.217 [background-preinit] DEBUG o.h.v.i.e.ValidatorFactoryConfigurationHelper - [determinePropertyNodeNameProvider,345] - HV000252: Using org.hibernate.validator.internal.engine.DefaultPropertyNodeNameProvider as property node name provider. 14:26:55.220 [background-preinit] DEBUG o.h.v.i.e.ValidatorFactoryConfigurationHelper - [logValidatorFactoryScopedConfiguration,420] - HV000234: Using org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator as ValidatorFactory-scoped message interpolator. 14:26:55.220 [background-preinit] DEBUG o.h.v.i.e.ValidatorFactoryConfigurationHelper - [logValidatorFactoryScopedConfiguration,421] - HV000234: Using org.hibernate.validator.internal.engine.resolver.TraverseAllTraversableResolver as ValidatorFactory-scoped traversable resolver. 14:26:55.220 [background-preinit] DEBUG o.h.v.i.e.ValidatorFactoryConfigurationHelper - [logValidatorFactoryScopedConfiguration,422] - HV000234: Using org.hibernate.validator.internal.util.ExecutableParameterNameProvider as ValidatorFactory-scoped parameter name provider. 14:26:55.221 [background-preinit] DEBUG o.h.v.i.e.ValidatorFactoryConfigurationHelper - [logValidatorFactoryScopedConfiguration,423] - HV000234: Using org.hibernate.validator.internal.engine.DefaultClockProvider as ValidatorFactory-scoped clock provider. 14:26:55.221 [background-preinit] DEBUG o.h.v.i.e.ValidatorFactoryConfigurationHelper - [logValidatorFactoryScopedConfiguration,424] - HV000234: Using org.hibernate.validator.internal.engine.scripting.DefaultScriptEvaluatorFactory as ValidatorFactory-scoped script evaluator factory. 14:26:55.282 [main] INFO c.a.n.p.a.s.c.ClientAuthPluginManager - [init,56] - [ClientAuthPluginManager] Load ClientAuthService com.alibaba.nacos.client.auth.impl.NacosClientAuthServiceImpl success. 14:26:55.282 [main] INFO c.a.n.p.a.s.c.ClientAuthPluginManager - [init,56] - [ClientAuthPluginManager] Load ClientAuthService com.alibaba.nacos.client.auth.ram.RamClientAuthServiceImpl success. . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.7.13) 14:27:05.056 [main] WARN c.a.c.n.c.NacosPropertySourceBuilder - [loadNacosData,87] - Ignore the empty nacos configuration and get it based on dataId[project-public.yaml] & group[DEV] 14:27:05.395 [main] WARN c.a.c.n.c.NacosPropertySourceBuilder - [loadNacosData,87] - Ignore the empty nacos configuration and get it based on dataId[project-mysql.yaml] & group[DEV] 14:27:05.723 [main] WARN c.a.c.n.c.NacosPropertySourceBuilder - [loadNacosData,87] - Ignore the empty nacos configuration and get it based on dataId[ruoyi-auth] & group[DEV] 14:27:06.055 [main] WARN c.a.c.n.c.NacosPropertySourceBuilder - [loadNacosData,87] - Ignore the empty nacos configuration and get it based on dataId[ruoyi-auth.yaml] & group[DEV] 14:27:06.062 [main] INFO c.r.a.RuoYiAuthApplication - [logStartupProfileInfo,631] - No active profile set, falling back to 1 default profile: "default" 14:27:06.739 [main] DEBUG o.a.i.l.LogFactory - [setImplementation,109] - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter. 14:27:06.740 [main] DEBUG o.m.s.m.ClassPathMapperScanner - [scanCandidateComponents,435] - Identified candidate component class: file [E:\前后端代码\shigong-new_20250810 (2)\shigong-new - 副本\ruoyi-auth\target\classes\com\ruoyi\auth\dao\SysBlackIpDao.class] 14:27:06.740 [main] DEBUG o.m.s.m.ClassPathMapperScanner - [debug,49] - Creating MapperFactoryBean with name 'sysBlackIpDao' and 'com.ruoyi.auth.dao.SysBlackIpDao' mapperInterface 14:27:06.742 [main] DEBUG o.m.s.m.ClassPathMapperScanner - [debug,49] - Enabling autowire by type for MapperFactoryBean with name 'sysBlackIpDao'. 14:27:07.101 [main] INFO o.a.c.h.Http11NioProtocol - [log,173] - Initializing ProtocolHandler ["http-nio-8080"] 14:27:07.102 [main] INFO o.a.c.c.StandardService - [log,173] - Starting service [Tomcat] 14:27:07.102 [main] INFO o.a.c.c.StandardEngine - [log,173] - Starting Servlet engine: [Apache Tomcat/9.0.76] 14:27:07.249 [main] INFO o.a.c.c.C.[.[.[/] - [log,173] - Initializing Spring embedded WebApplicationContext 14:27:07.556 [main] WARN o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - [refresh,591] - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tokenController': Unsatisfied dependency expressed through field 'sysLoginService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sysLoginService': Unsatisfied dependency expressed through field 'sysBlackIpDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sysBlackIpDao' defined in file [E:\前后端代码\shigong-new_20250810 (2)\shigong-new - 副本\ruoyi-auth\target\classes\com\ruoyi\auth\dao\SysBlackIpDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class 14:27:07.559 [main] INFO o.a.c.c.StandardService - [log,173] - Stopping service [Tomcat] 14:27:07.579 [main] ERROR o.s.b.d.LoggingFailureAnalysisReporter - [report,40] - *************************** APPLICATION FAILED TO START *************************** Description: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured. Reason: Failed to determine a suitable driver class Action: Consider the following: If you want an embedded database (H2, HSQL or Derby), please put it on the classpath. If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active). 14:27:07.580 [Thread-9] WARN c.a.n.c.n.NotifyCenter - [shutdown,136] - [NotifyCenter] Start destroying Publisher 14:27:07.580 [Thread-3] WARN c.a.n.c.h.HttpClientBeanHolder - [shutdown,102] - [HttpClientBeanHolder] Start destroying common HttpClient 14:27:07.580 [Thread-9] WARN c.a.n.c.n.NotifyCenter - [shutdown,153] - [NotifyCenter] Destruction of the end 14:27:07.581 [Thread-3] WARN c.a.n.c.h.HttpClientBeanHolder - [shutdown,111] - [HttpClientBeanHolder] Destruction of the end 进程已结束,退出代码为 1 解析一下生成结果
最新发布
08-21
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