log4j報錯：ERROR Could not find value for key log4j.appender.Console
使用Maven包管理工具，按住shift后點擊log4j的依賴，可以直接進入log4j-1.2.17.pom中，說明包導入成功；
log4j.properties文件中內容如下：
#日志的輸入級別和輸出位置
log4j.rootLogger = DEBUG,Console
#配置此類可以將log日志輸出到控制臺
log4.appender.Console = org.apache.log4j.ConsoleAppender
#自定義的日志布局
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
#自定義的日志布局格式
#%d : 查詢日志的時間
#%t : 產生的日志所處線程的線程名稱
#%p : 輸出的日志的級別，5表示輸出的字符至少五個，-表示如果輸出的字符少于五個，少的部分由空格補齊并且補充的空格在右邊，
# ? ?若不加-號，則補齊的空格在左邊
#%c : 輸出的日志所處的類的全名
#%m : 輸出日志時的附加信息
#%n : 換行
log4j.appender.Console.layout.ConversionPattern = %d [%t] %-5p [%c] - %m%n
#為某個包單獨設置輸出級別，org.apache可以是任意的包名
#log4j.logger.org.apache = INFO報錯如下：
Connected to server
[2018-05-16 09:21:44,533] Artifact micromessage:war exploded: Artifact is being deployed, please wait...
16-May-2018 09:21:45.496 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
[2018-05-16 09:21:45,566] Artifact micromessage:war exploded: Artifact is deployed successfully
[2018-05-16 09:21:45,566] Artifact micromessage:war exploded: Deploy took 1,033 milliseconds
command = null
description = null
log4j:ERROR Could not find value for key log4j.appender.Console
log4j:ERROR Could not instantiate appender named "Console".
log4j:WARN No appenders could be found for logger (Message.selectMessageList).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
2018-05-16
……配置文件log4j寫成log4了，啊啊啊啊，尷尬，請大家忽略我的提問