如何指示log4j输出,以便不同的日志级别转到不同的appender？

log4j.appender.consoleAppender=org.apache.log4j.ConsoleAppender
log4j.appender.consoleAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.consoleAppender.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

log4j.appender.fileAppender=org.apache.log4j.RollingFileAppender
log4j.appender.fileAppender.File=application.log
log4j.appender.fileAppender.MaxBackupIndex=10
log4j.appender.fileAppender.MaxFileSize=10MB
log4j.appender.fileAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.fileAppender.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

log4j.logger.com.example=INFO, consoleAppender, fileAppender
log4j.logger.com.example.debug=DEBUG, consoleAppender, fileAppender
log4j.logger.com.example.error=ERROR, consoleAppender, fileAppender

import org.apache.log4j.Logger;

public class LogExample {
    private static final Logger logger = Logger.getLogger(LogExample.class);
    private static final Logger debugLogger = Logger.getLogger("com.example.debug");
    private static final Logger errorLogger = Logger.getLogger("com.example.error");

    public static void main(String[] args) {
        logger.info("这是INFO级别的日志");
        debugLogger.debug("这是DEBUG级别的日志");
        errorLogger.error("这是ERROR级别的日志");
    }
}