java 我可以在哪里以编程方式找到 log4j 日志文件的存储位置？
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Where can i programatically find where the log4j log files are stored?
提问by JavaRocky
Relative paths are used in the log4j.properties file.
log4j.properties 文件中使用了相对路径。
How can i find the absolute path programatically where logs are stored?
如何以编程方式找到存储日志的绝对路径？
回答by Basil Musa
From: http://www.gunith.com/2010/11/how-to-get-the-file-path-of-a-log4j-log-file/
来自：http: //www.gunith.com/2010/11/how-to-get-the-file-path-of-a-log4j-log-file/
Assume the log4j.properties file is as below,
假设 log4j.properties 文件如下，
log4j.logger.migrationlog = INFO, migration
log4j.appender.migration = org.apache.log4j.RollingFileAppender
log4j.appender.migration.File = C:/work/log/migration.log
log4j.appender.migration.MaxFileSize=20MB
log4j.appender.migration.MaxBackupIndex=1
log4j.appender.migration.layout = org.apache.log4j.PatternLayout
log4j.appender.migration.layout.conversionPattern = %d %-5p %c - %m%n
In such case, your Java code should be as follows,
在这种情况下，您的 Java 代码应如下所示，
Logger logger = Logger.getLogger("migrationlog"); //Defining the Logger
FileAppender appender = (FileAppender)logger.getAppender("migration");
return new File(appender.getFile());
Note that migrationlogwas used to create the logger object in the first line. And migrationis used to get the FileAppender which in turn calls getFile() to get the log File object.
请注意，migrationlog用于在第一行中创建记录器对象。并且迁移用于获取 FileAppender，后者又调用 getFile() 来获取日志文件对象。
回答by Inv3r53
I think one way is like this:
我认为一种方法是这样的：
since the path is relative to system property "user.dir"
因为路径是相对于系统属性“user.dir”
so relative path = ./app.logbecomes {user.dir}/app.log
所以相对路径 =./app.log变成 {user.dir}/app.log
get user.dir as System.getproperty("user.dir").
