logger.info（）；啥意思

Posted 2023-04-16

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本人小白，直接告诉我中文意思好了

logger是用log4j作为日志输出组件的，info是日志的级别。

使用了logger.info后，可以将日志信息写入，例登陆成功判断后，调用logger.info( "2010年12月17日12：20:25 用户xxx成功登录")，就能将日志信息写入配置的文件中。

设置保存日志的位置，以日期作为文件名：

public static final Logger logger=Logger.getLogger(Main.class.toString());

StringBuffer logPath=new StringBuffer();

logPath.append("f:\\\\javalogs"); //设置保存路径

//设置文件名

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

logPath.append("\\\\"+sdf.format(new Date())+".log");

//将输出handler加入logger

try

FileHandler fileHandler=new FileHandler(logPath.toString(),true);

logger.addHandler(fileHandler);

catch (IOException e)

e.printStackTrace();

参考技术A 就是写日志信息，配置好了log4j后(log4j 中肯定配置了日志文件的地址)，那么使用了logger.info后，可以将日志信息写入：例,登陆成功判断后，调用logger.info( "2010年12月17日12：20:25 用户xxx成功登录");就能将日志信息写入配置的文件中本回答被提问者和网友采纳参考技术B 对象logger调用info()方法

cmd窗口下执行jar包 logger.info输出乱码，out语句输出正常解决办法

一问题描述

执行jar包，在cmd窗口中执行jar包，看到输出中，logger.info的输出为乱码，而System.out.println()输出为正确的日志。

二解决办法

1.因为cmd默认的编码为GBK，jar包一般设置为UTF-8;

2.在cmd窗口先输入：

2.1 chcp 65001 （注意之间有空格）

2.2 然后执行jar包命令：E:\\huadian-project\\fan_intelligent_server\\target>java -jar -Dfile.encoding=utf-8 fanintelligent.jar

Active code page: 65001

E:\\huadian-project\\fan_intelligent_server\\target>java -jar -Dfile.encoding=utf-8 fanintelligent.jar

  .   ____          _            __ _ _
 /\\\\ / ___'_ __ _ _(_)_ __  __ _ \\ \\ \\ \\
( ( )\\___ | '_ | '_| | '_ \\/ _` | \\ \\ \\ \\
 \\\\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.4.2)

2021-06-02 22:28:37.570  INFO 5632 --- [           main] com.bonc.smartpower.fanintelligent.App   : Starting App v0.0.1-SNAPSHOT using Java 1.8.0_181 on LAPTOP-VC53HCIP with PID 5632 (E:\\huadian-project\\fan_intelligent_server\\target\\fanintelligent.jar started by jurfl in E:\\huadian-project\\fan_intelligent_server\\target)
2021-06-02 22:28:37.574  INFO 5632 --- [           main] com.bonc.smartpower.fanintelligent.App   : No active profile set, falling back to default profiles: default
2021-06-02 22:28:42.119  INFO 5632 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2021-06-02 22:28:43.135  INFO 5632 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 996 ms. Found 13 JPA repository interfaces.
2021-06-02 22:28:46.605  INFO 5632 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-06-02 22:28:46.621  INFO 5632 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-06-02 22:28:46.621  INFO 5632 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.41]
2021-06-02 22:28:46.768  INFO 5632 --- [           main] o.a.c.c.C.[.[.[/fanIntelligentServer]    : Initializing Spring embedded WebApplicationContext
2021-06-02 22:28:46.768  INFO 5632 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 8891 ms
2021-06-02 22:28:47.063  INFO 5632 --- [           main] c.a.d.s.b.a.DruidDataSourceAutoConfigure : Init DruidDataSource
2021-06-02 22:28:47.561  INFO 5632 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} inited
2021-06-02 22:28:47.907  INFO 5632 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2021-06-02 22:28:48.149  INFO 5632 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.4.27.Final
2021-06-02 22:28:48.461  INFO 5632 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2021-06-02 22:28:49.075  INFO 5632 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL57Dialect
2021-06-02 22:28:50.278  INFO 5632 --- [           main] o.h.e.t.j.p.i.JtaPlatformInitiator       : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2021-06-02 22:28:50.295  INFO 5632 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2021-06-02 22:28:53.080  WARN 5632 --- [           main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2021-06-02 22:28:53.414  INFO 5632 --- [           main] pertySourcedRequestMappingHandlerMapping : Mapped URL path [/v2/api-docs] onto method [springfox.documentation.swagger2.web.Swagger2Controller#getDocumentation(String, HttpServletRequest)]
2021-06-02 22:28:53.776  INFO 5632 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-06-02 22:28:54.416  INFO 5632 --- [           main] o.s.s.c.ThreadPoolTaskScheduler          : Initializing ExecutorService 'taskScheduler'
2021-06-02 22:28:54.545  INFO 5632 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path '/fanIntelligentServer'
2021-06-02 22:28:54.546  INFO 5632 --- [           main] d.s.w.p.DocumentationPluginsBootstrapper : Context refreshed
2021-06-02 22:28:54.585  INFO 5632 --- [           main] d.s.w.p.DocumentationPluginsBootstrapper : Found 1 custom documentation plugin(s)
2021-06-02 22:28:54.706  INFO 5632 --- [           main] s.d.s.w.s.ApiListingReferenceScanner     : Scanning for api listing references
2021-06-02 22:28:55.028  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.029  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingGET_1
2021-06-02 22:28:55.030  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.033  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingHEAD_1
2021-06-02 22:28:55.034  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.035  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingPOST_1
2021-06-02 22:28:55.036  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.037  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingPUT_1
2021-06-02 22:28:55.038  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.042  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingPATCH_1
2021-06-02 22:28:55.044  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.045  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingDELETE_1
2021-06-02 22:28:55.046  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.048  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingOPTIONS_1
2021-06-02 22:28:55.049  WARN 5632 --- [           main] s.d.s.w.r.p.ParameterDataTypeReader      : Trying to infer dataType java.lang.String[]
2021-06-02 22:28:55.052  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: updateMonitorStateUsingTRACE_1
2021-06-02 22:28:55.224  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: exportFanAlarmListUsingGET_1
2021-06-02 22:28:55.232  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingGET_1
2021-06-02 22:28:55.232  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingHEAD_1
2021-06-02 22:28:55.233  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingPOST_1
2021-06-02 22:28:55.234  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingPUT_1
2021-06-02 22:28:55.234  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingPATCH_1
2021-06-02 22:28:55.235  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingDELETE_1
2021-06-02 22:28:55.237  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingOPTIONS_1
2021-06-02 22:28:55.239  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: getfanDeviceInfoUsingTRACE_1
2021-06-02 22:28:55.243  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: queryFanListInfoUsingPOST_1
2021-06-02 22:28:55.312  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingGET_1
2021-06-02 22:28:55.312  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingHEAD_1
2021-06-02 22:28:55.314  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingPOST_1
2021-06-02 22:28:55.315  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingPUT_1
2021-06-02 22:28:55.317  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingPATCH_1
2021-06-02 22:28:55.318  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingDELETE_1
2021-06-02 22:28:55.319  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingOPTIONS_1
2021-06-02 22:28:55.320  INFO 5632 --- [           main] .d.s.w.r.o.CachingOperationNameGenerator : Generating unique operation named: selectDeviceUsingTRACE_1
2021-06-02 22:28:55.418  INFO 5632 --- [           main] com.bonc.smartpower.fanintelligent.App   : Started App in 18.908 seconds (JVM running for 19.783)
2021-06-02 22:28:55.423  INFO 5632 --- [           main] com.bonc.smartpower.fanintelligent.App   : =====================华电智能预警服务启动成功===============！！！！！！！
=====================华电智能预警服务启动成功===============！！！！！！！

3.如果还是乱码的话，需要修改字体：

在命令行标题栏上点击右键，选择"属性"->"字体"，将字体修改为True Type字体"Lucida Console"，然后点击确定将属性应用到当前窗口。如下图所示: