Java 配置 log4j 以在运行时登录到自定义文件
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configure log4j to log to custom file at runtime
提问by Fell
Can anyone please guide me as to how I can configure log4j to log to a specific file that I specify at run-time.The name and path of the log file are generated at run-time and the application must log to that particular file.
任何人都可以指导我如何配置 log4j 以登录到我在运行时指定的特定文件。日志文件的名称和路径是在运行时生成的，应用程序必须登录到该特定文件。
Generally file appender entries in the log4j.properties file points to the log file that will be used by the application.However in this case I would like to read the log file path from the command line and log to that particular file.
通常 log4j.properties 文件中的文件附加条目指向应用程序将使用的日志文件。但是在这种情况下，我想从命令行读取日志文件路径并记录到该特定文件。
How can I achieve this ?
我怎样才能做到这一点？
采纳答案by Vinay Sajip
Adapted from the log4j documentation:
改编自 log4j 文档：
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.SimpleLayout;
import org.apache.log4j.FileAppender;
public class SimpandFile {
static Logger logger = Logger.getLogger(SimpandFile.class);
public static void main(String args[]) {
// setting up a FileAppender dynamically...
SimpleLayout layout = new SimpleLayout();
FileAppender appender = new FileAppender(layout,"your filename",false);
logger.addAppender(appender);
logger.setLevel((Level) Level.DEBUG);
logger.debug("Here is some DEBUG");
logger.info("Here is some INFO");
logger.warn("Here is some WARN");
logger.error("Here is some ERROR");
logger.fatal("Here is some FATAL");
}
}
回答by jmq
You can also do this from the log4j.properties file. Using the sample file below I have added the system property ${logfile.name}:
您也可以从 log4j.properties 文件执行此操作。使用下面的示例文件，我添加了系统属性${logfile.name}：
# logfile is set to be a RollingFileAppender
log4j.appender.logfile=org.apache.log4j.RollingFileAppender
log4j.appender.logfile.File=${logfile.name}
log4j.appender.logfile.MaxFileSize=10MB
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=[%-5p]%d{yyyyMMdd@HH\:mm\:ss,SSS}\:%c - %m%n
The log file name can then be set two different ways:
然后可以通过两种不同的方式设置日志文件名：
- As a command line, system property passed to java "-Dlogfile.name={logfile}"
In the java program directly by setting a system property (BEFORE you make any calls to log4j).
System.setProperty("logfile.name","some path/logfile name string");
- 作为命令行，系统属性传递给 java "-Dlogfile.name={logfile}"
在 java 程序中直接通过设置系统属性（在对 log4j 进行任何调用之前）。
System.setProperty("logfile.name","一些路径/日志文件名字符串");
回答by Sumit
Can be also done by this properties define in log4j.properties file
也可以通过在 log4j.properties 文件中定义的这个属性来完成
log4j.appender.logfile=org.apache.log4j.RollingFileAppender
log4j.appender.logfile.maxFileSize=5000KB
log4j.appender.logfile.maxBackupIndex=5
log4j.appender.logfile.File=/WebSphere/AppServer/profiles/Custom01/error.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p [%t] %C %M %c{1}:%L - %m%n
回答by Manimaran Samuthirapandi
Working and same has been tested
工作和相同已经过测试
// setting up a FileAppender dynamically...
SimpleLayout layout = new SimpleLayout();
RollingFileAppender appender = new RollingFileAppender(layout,"file-name_with_location",true);
appender.setMaxFileSize("20MB");
logger.addAppender(appender);
