Study：mybatis的log打印SQL的问题

web.xml的配置也正确，log4j.properties配置也添加了。

#
# Log4J Settings for log4j 1.2.x (via jakarta-commons-logging)
#
# The five logging levels used by Log are (in order):
# 
#   1. DEBUG (the least serious)
#   2. INFO
#   3. WARN
#   4. ERROR
#   5. FATAL (the most serious)


# Set root logger level to INFO and append to stdout
log4j.rootLogger=INFO,stdout,file

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=[%p]%-d{yyyy-MM-dd HH\:mm\:ss}[%c\:%L] %m%n 

log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File=D://mvc.log
log4j.appender.file.DatePattern='.'yyyy-MM-dd
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p]%-d{yyyy-MM-dd HH\:mm\:ss}[%c\:%L] %m%n 

# Print only messages of level ERROR or above in the package noModule.
log4j.logger.noModule=DEBUG

# Spring Stuff
log4j.logger.org.springframework=FATAL


#kuaiba
log4j.logger.com.student=DEBUG

# Sql
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG

 但是仍然不能打印sql语句，折腾了好久，看到控制台输出关于sfl4j的消息，网上查询了好久，才发现是缺少jar包。加入以上两个jar包就解决了。

<dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
</dependency>
<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.1</version>
</dependency>
<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.1</version>
</dependency>