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  • JUL日志级别

    2021-04-26 20:02:50
    jul中定义的日志级别 * java.util.logging.Level中定义了日志的级别: SEVERE(最高值) WARNING INFO (默认级别) CONFIG FINE FINER FINEST(最低值) * 还有两个特殊的级别: OFF,可用来关闭...

    jul中定义的日志级别

    * java.util.logging.Level中定义了日志的级别: 
    	SEVERE(最高值) 
    	WARNING 
    	INFO (默认级别) 
    	CONFIG 
    	FINE 
    	FINER 
    	FINEST(最低值) 
    * 还有两个特殊的级别: OFF,可用来关闭日志记录。 ALL,启用所有消息的日志记录
    

    虽然我们测试了7个日志级别但是默认只实现info以上的级别

    //日志级别
        @Test
        public void testLogLevel() throws Exception {
            // 1.获取日志对象
            Logger logger = Logger.getLogger("com.huanhuan.Jul_Test.testLogLevel");
            // 2.日志记录输出
            logger.severe("severe"); //严重
            logger.warning("warning"); //警告
            logger.info("info"); //默认信息
            logger.config("cofnig"); //配置
            logger.fine("fine"); //详细
            logger.finer("finer"); //比较详细
            logger.finest("finest"); //非常详细
        }
    

    自定义日志级别配置

    //自定义日志级别
        @Test
        public void testLogConfig() throws Exception{
            // 1.获取日志对象
            Logger logger = Logger.getLogger("com.huanhuan.Jul_Test.testLogLevel");
            //关闭系统默认配置
            logger.setUseParentHandlers( false );
    
            //自定义配置日志级别
            //创建ConsolHhandler
            ConsoleHandler consoleHandler = new ConsoleHandler();
            //创建简单格式转换对象
            SimpleFormatter simpleFormatter = new SimpleFormatter();
            //进行关联
            consoleHandler.setFormatter(simpleFormatter);
            logger.addHandler( consoleHandler );
    
            //设置日志的具体级别
            logger.setLevel(Level.ALL);
            consoleHandler.setLevel( Level.ALL );
    
            //设置文件场景输出
            String path = "E:\\Project\\The_Log\\Jul_Demo\\src\\main\\resources\\jul.log";
            FileHandler fileHandler = new FileHandler(path);
            //进行关联
            fileHandler.setFormatter(simpleFormatter);
            logger.addHandler( fileHandler );
    
    
            //打印输出
            logger.severe("severe"); //严重
            logger.warning("warning"); //警告
            logger.info("info"); //默认信息
            logger.config("cofnig"); //配置
            logger.fine("fine"); //详细
            logger.finer("finer"); //比较详细
            logger.finest("finest"); //非常详细
        }
    
    展开全文
  • java日志级别

    2021-02-10 10:12:27
    在 java中日志级别分别有7 个级别:severe、Warning、info、config、fine、finer、finest。默认情况只记录前三个级别。当然你可以使用Level.ALL开启所有的级别记录。或者使用Level.OFF关闭所有的级别记录。 在日常的...

    在 java中日志级别分别有7 个级别:severe、Warning、info、config、fine、finer、finest。默认情况只记录前三个级别。当然你可以使用Level.ALL开启所有的级别记录。或者使用Level.OFF关闭所有的级别记录。
    在日常的开发中,我们用的最多的便是log4j, log4j中日志级别有8种:分别为 ALL、TRACE、DEBUG、INFO、WARN、ERROR、FATAL、OFF。

    ALL
    最低等级的,用于打开所有日志记录。
    TRACE
    很低的日志级别,一般不会使用。
    DEBUG
    指出细粒度信息事件对调试应用程序是非常有帮助的,主要用于开发过程中打印一些运行信息。
    INFO
    消息在粗粒度级别上突出强调应用程序的运行过程。打印一些你感兴趣的或者重要的信息,这个可以用于生产环境中输出程序运行的一些重要信息,比如与三方应用交互时的入参和出参建议打印以便问题定位,但是不能滥用,避免打印过多的日志。
    WARN
    表明会出现潜在错误的情形,有些信息不是错误信息,但是也要给程序员的一些提示。
    ERROR
    指出虽然发生错误事件或者异常捕获,但不影响系统的继续运行。打印错误和异常信息,如果不想输出太多的日志,可以使用这个级别。
    FATAL
    指出每个严重的错误事件将会导致应用程序的退或者直接导致宕机。这个级别比较高了。属于重大性致命性的错误,出现这种级别你可以直接停止程序了。
    OFF
    最高等级的,用于关闭所有日志记录。

    如果将log level设置在某一个级别上,那么比此级别优先级高的log都能打印出来。例如,如果设置优先级为WARN,那么OFF、FATAL、ERROR、WARN 4个级别的log能正常输出,而INFO、DEBUG、TRACE、 ALL级别的log则会被忽略。Log4j建议只使用四个级别,优先级从低到高分别是DEBUG、INFO、WARN、ERROR。
    !log4j默认的优先级为ERROR。

    展开全文
  • I have read about different levels of logger which are: SEVERE (highest) WARNING INFO CONFIG FINE FINER FINEST I am not able to understand the usage of each logging level. Can someone give me a good ...

    I am developing an application where i need to use the logger functionality. I have read about different levels of logger which are:

    SEVERE (highest)

    WARNING

    INFO

    CONFIG

    FINE

    FINER

    FINEST

    I am not able to understand the usage of each logging level.

    Can someone give me a good example showing all the logging levels and their usage?

    解决方案

    Generally, you don't need all those levels, SEVERE, WARNING, INFO, FINE might be enough. We're using Log4J (not java.util.logging directly) and the following levels (which might differ in name from other logging frameworks):

    ERROR: Any error/exception that is or might be critical. Our Logger automatically sends an email for each such message on our servers (usage: logger.error("message"); )

    WARN: Any message that might warn us of potential problems, e.g. when a user tried to log in with wrong credentials - which might indicate an attack if that happens often or in short periods of time (usage: logger.warn("message"); )

    INFO: Anything that we want to know when looking at the log files, e.g. when a scheduled job started/ended (usage: logger.info("message"); )

    DEBUG: As the name says, debug messages that we only rarely turn on. (usage: logger.debug("message"); )

    The beauty of this is that if you set the log level to WARN, info and debug messages have next to no performance impact. If you need to get additional information from a production system you just can lower the level to INFO or DEBUG for a short period of time (since you'd get much more log entries which make your log files bigger and harder to read). Adjusting log levels etc. can normally be done at runtime (our JBoss instance checks for changes in that config every minute or so).

    展开全文
  • 解决方案 It's subject to personal interpretation, but mine is (in order from finest to coursest): Trace - The finest logging level. Can be used to log very specific information that is only relevant ...

    Is there a convention, a standard, or a widely used guide which will help with logging in Java? Specifically, what to include at each level (verbose, debug, ... etc.) rather than the actual mechanism of logging.

    There are many guides out there of what to include at each log level, but none of them are specific; they're all vague, and this makes it hard to "follow orders".

    Any tips would be appreciated.

    解决方案

    It's subject to personal interpretation, but mine is (in order from finest to coursest):

    Trace - The finest logging level. Can be used to log very specific information that is only relevant in a true debugging scenario, e.g., log every database access or every HTTP call etc.

    Debug - Information to primary help you to debug your program. E.g., log every time a batching routine empties its batch or a new file is created on disk etc.

    Info - General application flow, such as "Starting app", "connecting to db", "registering ...". In short, information which should help any observer understand what the application is doing in general.

    Warn - Warns of errors that can be recovered. Such as failing to parse a date or using an unsafe routine. Note though that we should still try to obey the fail fast principle and not hide e.g., configuration errors using warning message, even though we a default value might be provided by the application.

    Error - Denotes an often unrecoverable error. Such as failing to open a database connection.

    Fatal/Critical Used to log an error the application cannot recover from, which might lead to an immediate program termination.

    In the end it's up to you to define what suits you best. Personally, I run most production system with logging level of Info, where I'm mostly interested in following the applications main logic, and of course catch all warnings/errors.

    Except for code cluttering, there is no such thing as too much logging. All logging which helps you reproduce or understand problems better are good logging. On a performance note, most logging systems (e.g., log4j) allows configuring which level to actually append to the physical log which is a great thing.

    展开全文
  • JUL日志级别介绍

    2020-05-05 14:10:27
    日志的级别 ...jul中定义的日志级别 * java.util.logging.Level中定义了日志的级别: SEVERE(最高值) WARNING INFO (默认级别) CONFIG FINE FINER FINEST(最低值) * 还有两个特殊的级...
  • logger.log(java.util.logging.Level.FINEST, "finest"); Output: SEVERE: severe WARNING: warning INFO: info 解决方案 I typically use logback to implement logging, which seems a tad better documented. So...
  • tomcat 日志级别

    万次阅读 2016-01-15 10:48:16
    修改为文件:/tomcat/conf/logging.properties每类日志级别分为如下 7 种:SEVERE (highest value) > WARNING > INFO > CONFIG > FINE > FINER > FINEST (lowest value)
  • tomcat日志级别

    千次阅读 2018-06-05 15:21:05
    tomcat日志级别有以下几种: Log level Description SEVERE(highest) Captures exception and Error WARNING Warning messages INFO Informational message, related to the server activity CONFIG ...
  • log日志级别与简介

    2020-03-10 23:50:34
    8个级别优先级从高到低依次为:OFF、FATAL、ERROR、WARN、INFO、DEBUG、TRACE...日志等级说明  1.static Level DEBUG :   DEBUG Level指出细粒度信息事件对调试应用程序是非常有帮助的。  2.static Level INF...
  • JBoss 日志级别修改

    千次阅读 2014-11-20 14:18:44
    http://xxxxxx:9990/console 点击 Profile-->Core-->Logging--->Log Categories ...新建 JSF的日志级别 javax.enterprise.resource.webcontainer.jsf finest 届时 会在standalone/log/server.log看到
  • #日志输出级别:SEVERE (最高级别) > WARNING > INFO > CONFIG > FINE > FINER(精心) > FINEST (所有内容,最低级别) #配置文件使catalina日志输出级别为FINE 1catalina.org.apache.juli.FileHandler.level = FINE ...
  • Resin3.x日志级别

    2011-02-24 10:08:25
    和java.util.logging.Level中的日志级别对应     声明为 Level  的 java.util.logging  中的字段 static Level Level. ALL    ALL 指示应该记录所有消息。 static Level...
  • Java自带 severe warn info config 、fine、finer、finest log4j off fatal error warn info debug trace all slf4j error warn info debug trace
  • log4j配置文件基本含义说明 log4j.properties配置文件讲解如下: #log4j中有五级logger #FATAL 0 #ERROR 3 #WARN 4 #INFO 6 #DEBUG 7 配置根Logger,其语法为: ...level 是日志记录的优先级 app...
  • 设置日志打印级别

    万次阅读 2016-11-16 14:20:11
    tomcat 日志信息分 为 两 类 : 一是运行中的日志,它主要 记录 运行的一些信息,尤其是一些异常 错误 日志信息 。 二是 访问 日志信息,它 记录 的 访问 的 时间 , IP , 访问 的 资 料等相 关 信息。 2 ...
  • Log.isLoggable(String tag, int level),检查当前的tag是否在指定的log级别。 一般默认的log级别是INFO,这也就意味着在这之上包括INFO的log都会被输出。  你可以通过设置系统属性修改默认的log级别,执行如下...
  • Tomcat是使用自己的日志实现tomcat-juli.jar来打印日志信息的,日志会被打印到catalina.out里,除去你在项目里自己使用的日志框架外,由System.out,System.err或者printStackTrace()打印出来的信息则是会被输入到...
  • 最近在看一些日志门面和日志实现的整合,发现在最老的jul中日志分为七个级别,与slf4j的五个级别的对应关系如下: JUL slf4j SERVERE ERROR WARNING WARNING INFO INFO CONFIG INFO FINE DEBUG ...
  • 日志

    2020-12-13 22:09:08
    Java一共有七个日志级别,默认情况下只记录前三个。 SEVERE WARNING INFO CONFIG FINE FINER FINEST
  • 普元 AppServer 6.5 支持哪些日志级别? 【解答】 支持如下级别: OFF:是一个可用于关闭日志记录的特殊级别。 FINEST:指示一条最详细的跟踪消息。 FINER:指示一条相当详细的跟踪消息。 FINE:是提供跟踪...
  • 启动配置 Application, 设置Main和虚拟机参数catalina.home和日志管理类, 日志配置文件, home目录自己创建. (jdk版本问题, 源代码下有个BUILDING.txt文件, 里面说明了jdk版本,一般来说jdk8) 新建home目录层级:...
  • tomcat 日志详解

    千次阅读 2019-07-22 19:18:44
    1 tomcat 日志详解 1.1 tomcat 日志配置文件  tomcat 对应日志的配置... tomcat 的日志等级有:日志输出级别:SEVERE (最高级别) > WARNING > INFO > CONFIG > FINE > FINER(精心) > FINEST...
  • 日志使用

    2019-02-14 10:49:28
    一、常见日志框架 1.log4j 2.log4j2 3.slf4j (simple logging facade for java) ...三、日志级别 四、日志示例 五、tomcat日志输出级别 六、tomcat日志输出设置 七、tomcat日志过大处理办法 八、总结 ...
  • java log日志

    2013-06-18 18:36:03
    有7个日志级别 SEVERE WARNING INFO CONFIG FINE FINER FINEST 可以设置级别 Logger.setLevel(Level.FINE);使用Level.ALL开启所有级别的记录,或者Level.OFF关闭所有级别的记录 同时可以使用log方法logger...
  • 日志框架日志框架之JULJUL的基本使用JUL的日志级别JUL的默认日志级别自定义JUL的日志级别Logger之间的父子关系默认的日志配置文件自定义日志的配置文件 日志框架之JUL JUL全称Java util Logging是java原生的日志...

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