Spring mvc+mybatis+Log4j控制台打印sql语句

第一步：添加依赖，在web层中

<!-- log start -->
<dependency>
  <groupId>log4j</groupId>
  <artifactId>log4j</artifactId>
  <version>${log4j.version}</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>${slf4j.version}</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-log4j12</artifactId>
  <version>${slf4j.version}</version>
</dependency>
<!-- log end -->

<slf4j.version>1.6.6</slf4j.version>
<log4j.version>1.2.12</log4j.version>

第二步：在resources下添加log4j文件，此文件系统自动加载。

第三步：

log4j.properties中添加以下内容

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m


# LOGFILE is set to be a File appender using a PatternLayout.
# log4j.appender.LOGFILE=org.apache.log4j.FileAppender
# log4j.appender.LOGFILE.File=d:axis.log
# log4j.appender.LOGFILE.Append=true
# log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
# log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m

# 打印出sql语句相关日志
log4j.logger.java.sql.ResultSet=error
log4j.logger.java.sql.Connection=error
log4j.logger.java.sql.Statement=debug
log4j.logger.java.sql.PreparedStatement=debug

如果要在dubbox等分布式项目中打印出来sql，则需要将log4j.properties放入dao或者service中加载，因为在网络中传输过程中，可能导致打印信息传输失败，分页插件使用也要在service中使用，原理同理。