我有以下导入:
import org.slf4j.Logger; import org.slf4j.LoggerFactory;以及以下实例:
private static Logger logger = LoggerFactory.getLogger(Test.class);以及我的Main方法中的以下内容:
logger.info(SOME MESSAGE:);但是,我无法在任何地方找到输出。我只看到在我的控制台中有:
21:21:24.235 [main] INFO some_folder.Test - SOME MESSAGE :如何找到日志文件?
请注意,以下内容位于我的构建路径中:
slf4j-api-1.7.5.jar
slf4j-log4j12-1.6.4.jar
<我读了类似问题的答案,但没有人真正说明如何解决这个问题。解决方案slf4j只是一个API。您应该有一个具体的实现(例如log4j)。这个具体实现有一个配置文件,告诉你存储日志的位置。
当slf4j使用记录器捕获日志消息时,会将其提供给appender,该appender决定如何处理消息。默认情况下,ConsoleAppender在控制台中显示消息。
默认配置文件为:
<?xml version =1.0encoding =UTF-8?> <配置状态=警告> < Appenders> <! - 默认情况下=>控制台 - > < Console name =Consoletarget =SYSTEM_OUT> < PatternLayout pattern =%d {HH:mm:ss.SSS} [%t]%-5level%logger {36} - %msg%n/> < / Console> < / Appenders> < Loggers> < Root level =error> < AppenderRef ref =控制台/> < / Root> < / Loggers> < /配置>如果您在类路径中提供配置文件,那么您的具体实现(在您的情况下,log4j) )会找到并使用它。请参阅 Log4J文档。
文件追加器的示例:
< Appenders> <文件名=文件fileName =$ {filename}> < PatternLayout> < pattern>%d%p%C {1。} [%t]%m%n< / pattern> < / PatternLayout> < / File> ... < / Appenders>文件追加器的完整示例:
<?xml version =1.0encoding =UTF-8?> <配置状态=警告> < Appenders> <文件名=文件fileName =$ {filename}> < PatternLayout> < pattern>%d%p%C {1。} [%t]%m%n< / pattern> < / PatternLayout> < / File> < / Appenders> < Loggers> < Root level =error> < AppenderRef ref =File/> < / Root> < / Loggers> < / Configuration>
I have the followed imports:
import org.slf4j.Logger; import org.slf4j.LoggerFactory;and the following instantiation:
private static Logger logger = LoggerFactory.getLogger(Test.class);and the following in my Main method:
logger.info("SOME MESSAGE: ");However, I'm not able to find the output anywhere. All I see is that in my console there is:
21:21:24.235 [main] INFO some_folder.Test - SOME MESSAGE:How do I locate the log file?
Note that the following are on my build path:
slf4j-api-1.7.5.jar
slf4j-log4j12-1.6.4.jar
I read the answer to similar questions but nobody actually says how to fix the problem.
解决方案slf4j is only an API. You should have a concrete implementation (for example log4j). This concrete implementation has a config file which tells you where to store the logs.
When slf4j catches a log messages with a logger, it is given to an appender which decides what to do with the message. By default, the ConsoleAppender displays the message in the console.
The default configuration file is :
<?xml version="1.0" encoding="UTF-8"?> <Configuration status="WARN"> <Appenders> <!-- By default => console --> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/> </Console> </Appenders> <Loggers> <Root level="error"> <AppenderRef ref="Console"/> </Root> </Loggers> </Configuration>If you put a configuration file available in the classpath, then your concrete implementation (in your case, log4j) will find and use it. See Log4J documentation.
Example of file appender :
<Appenders> <File name="File" fileName="${filename}"> <PatternLayout> <pattern>%d %p %C{1.} [%t] %m%n</pattern> </PatternLayout> </File> ... </Appenders>Complete example with a file appender :
<?xml version="1.0" encoding="UTF-8"?> <Configuration status="WARN"> <Appenders> <File name="File" fileName="${filename}"> <PatternLayout> <pattern>%d %p %C{1.} [%t] %m%n</pattern> </PatternLayout> </File> </Appenders> <Loggers> <Root level="error"> <AppenderRef ref="File"/> </Root> </Loggers> </Configuration>
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