使用Maven包管理工具，按住shift后點(diǎn)擊log4j的依賴，可以直接進(jìn)入log4j-1.2.17.pom中，說明包導(dǎo)入成功；

log4j.properties文件中內(nèi)容如下：

#日志的輸入級(jí)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(tái)
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?nèi)罩镜臅r(shí)間
#%t : 產(chǎn)生的日志所處線程的線程名稱
#%p : 輸出的日志的級(jí)別，5表示輸出的字符至少五個(gè)，-表示如果輸出的字符少于五個(gè)，少的部分由空格補(bǔ)齊并且補(bǔ)充的空格在右邊，
# ? ?若不加-號(hào)，則補(bǔ)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(shí)的附加信息
#%n : 換行
log4j.appender.Console.layout.ConversionPattern = %d [%t] %-5p [%c] - %m%n
#為某個(gè)包單獨(dú)設(shè)置輸出級(jí)別，org.apache可以是任意的包名
#log4j.logger.org.apache = INFO

報(bào)錯(cuò)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.