mybatis 3.2.8 + log4j2.0.2 控制台输出sql语句

mybatis3.2.7有一个bug,使用log4j2 (2.0.2)版本时,会找不到类 ,导致启动失败,详见

https://github.com/mybatis/mybatis-3/issues/235

但没过多久 , 3.2.8就已经修复了这个bug , 最新的mybatis3.2.8下载地址为:

https://github.com/mybatis/mybatis-3/releases

mybatis 3.2.8 整合 log4j2.0.2并不复杂 , 如果用spring-mvc做为web框架 , 以下是使用步骤:

1. pom.xml添加依赖项

 <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
             <version>1.7.7</version>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-api</artifactId>
             <version>${log4j2.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
             <version>${log4j2.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-web</artifactId>
             <version>${log4j2.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j-impl</artifactId>
             <version>2.0.2</version>
         </dependency>

slf4j的二项好象不加也行 , 大家可以自行试试

2. web.xml中增加listener

     <listener>
         <listener-class>org.apache.logging.log4j.web.Log4jServletContextListener</listener-class>
     </listener>
     <filter>
         <filter-name>log4jServletFilter</filter-name>
         <filter-class>org.apache.logging.log4j.web.Log4jServletFilter</filter-class>
     </filter>
     <filter-mapping>
         <filter-name>log4jServletFilter</filter-name>
         <url-pattern>/*</url-pattern>
         <dispatcher>REQUEST</dispatcher>
         <dispatcher>FORWARD</dispatcher>
         <dispatcher>INCLUDE</dispatcher>
         <dispatcher>ERROR</dispatcher>
     </filter-mapping>

上面这一段,加在web.xml最开头（注：这一步好象也可以去掉）

3. maven项目的resouces目录下 , 放置log4j2.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <Configuration status="off" monitorInterval="1800">    
 
     <Appenders>
         <Console name="Console" target="SYSTEM_OUT">
             <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
         </Console>
     </Appenders>
 
     <Loggers>
         <Root level="debug">
             <AppenderRef ref="Console" />
         </Root>
     </Loggers>
 </Configuration>

只要把root logger的级别调成debug级别即可

4.如果采用mybatis-spring项目来集成mybatis, spring配置文件参考下面这样:

     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="dataSource" ref="dataSource" />
         <property name="configLocation" value="classpath:mybatis-config.xml"></property>
         <property name="typeAliasesPackage" value="com.cnblogs.yjmyzz.entity"></property>
         <property name="mapperLocations" value="classpath:mybatis/**/*.xml"></property>
     </bean>

<property name="configLocation" value="classpath:mybatis-config.xml"></property> 这一行,指定了mybatis的主配置文件

5.mybatis-config配置文件

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-config.dtd">
 <configuration>
     <settings>
         <setting name="logImpl" value="LOG4J2" />
     </settings>
 </configuration>

指定mybatis使用log4j2来记录日志

如果在jboss eap 6.x上部署 , 启动时会有一个error , 但并不影响项目正常运行 , 这是log4j2的一个bug , 估计在后续版本中会修复,详情见:http://mail-archives.apache.org/mod_mbox/logging-log4j-dev/201403.mbox/%3CJIRA.12696787.1393155172406.128647.1393632623629@arcas%3E

鉴于国内不太方便下载github上的东西,最后给出mybatis-2.3.8.jar包文件下载:mybatis-3.2.8.jar.zip