java - 如何使用一个 log4j 配置文件创建 2 个单独的日志文件？

Question

我不知道如何配置我的 log4j，以便我的 debugLog 和我的 reportsLog 彼此分开(不是附加的)。为什么，在下面的配置中，reportsLog 总是空的？

log4j.rootLogger=TRACE, stdout, debugLog

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

log4j.appender.debugLog=org.apache.log4j.FileAppender
log4j.appender.debugLog.File=logs/debug.log
log4j.appender.debugLog.layout=org.apache.log4j.PatternLayout
log4j.appender.debugLog.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

log4j.reportsLog=DEBUG,reportsLog
log4j.appender.reportsLog=org.apache.log4j.FileAppender
log4j.appender.reportsLog.File=logs/reports.log
log4j.appender.reportsLog.layout=org.apache.log4j.PatternLayout
log4j.appender.reportsLog.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

这是我的 Java 代码:

package test;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

public class HelloLogger {

    static final Logger debugLog = Logger.getLogger("debugLog");
    static final Logger resultLog = Logger.getLogger("reportsLog");

    public static void main(String[] args) {
        PropertyConfigurator.configure("log4j.properties");
        debugLog.debug("Hello debugLog message");   
        resultLog.debug("Hello reportsLog message");
    }   
}

Answer 1

试试下面的配置:

log4j.rootLogger=TRACE, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

log4j.appender.debugLog=org.apache.log4j.FileAppender
log4j.appender.debugLog.File=logs/debug.log
log4j.appender.debugLog.layout=org.apache.log4j.PatternLayout
log4j.appender.debugLog.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

log4j.appender.reportsLog=org.apache.log4j.FileAppender
log4j.appender.reportsLog.File=logs/reports.log
log4j.appender.reportsLog.layout=org.apache.log4j.PatternLayout
log4j.appender.reportsLog.layout.ConversionPattern=%d [%24F:%t:%L] - %m%n

log4j.category.debugLogger=TRACE, debugLog
log4j.additivity.debugLogger=false

log4j.category.reportsLogger=DEBUG, reportsLog
log4j.additivity.reportsLogger=false

然后在 Java 代码中相应地配置记录器:

static final Logger debugLog = Logger.getLogger("debugLogger");
static final Logger resultLog = Logger.getLogger("reportsLogger");

你想输出到 stdout 吗？如果不是，将log4j.properties的第一行改为:

log4j.rootLogger=OFF

并去掉 stdout 行。