log4j2打印Mybatis执行的SQL语句及SQL语句的执行时间

系统管理员 2020-11-07 02:57 1927阅读 0赞

### 一、首先如需使用log4j2，得引入maven依赖 ###

<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>

注：本人使用的是2.7版本的log4j2

### 二、然后在项目的classpath下编写log4j2.xml ###

log4j2在启动的时候会默认加载名为log4j2.xml的配置文件

<?xml version="1.0" encoding="UTF-8"?>  
      <Configuration status="OFF" monitorInterval="1800">
        
          <properties>  
          	
              <property name="LOG_HOME">D:/log4j2/mybatis/genertor/logs/</property>
              <property name="ERROR_LOG_FILE_NAME">error</property>
          </properties>  
          <Appenders>  
          	
              <Console name="Console" target="SYSTEM_OUT">  
                  <PatternLayout pattern="%d %-5p (%F:%L) - %m%n" />  
              </Console>  
        	
              <RollingRandomAccessFile name="ErrorLog"  
                                       fileName="${LOG_HOME}/${ERROR_LOG_FILE_NAME}.log"  
                                       filePattern="${LOG_HOME}/${ERROR_LOG_FILE_NAME}.log.%d{yyyy-MM-dd}.gz">  
                  <PatternLayout  
                          pattern="%d %-5p (%F:%L) - %m%n"/>  
                  <Policies>  
                  	  
                      <TimeBasedTriggeringPolicy/>  
                      
                      <SizeBasedTriggeringPolicy size="100 MB"/>  
                  </Policies>
                    
                  <DefaultRolloverStrategy max="20"/>  
              </RollingRandomAccessFile>  
              <param name="Encoding" value="UTF-8" />
          </Appenders>  
        
          <Loggers>  
                
              <logger name="org.springframework.core" level="info">  
              </logger>  
              <logger name="org.springframework.beans" level="info">  
              </logger>  
              <logger name="org.springframework.context" level="info">  
              </logger>  
              <logger name="org.springframework.web" level="info">  
              </logger>  
              <logger name="org.springframework.test.context.junit4.SpringJUnit4ClassRunner" level="info">  
              </logger>  
              
              <logger name="com.stu" level="debug" includeLocation="true" additivity="false">
                  <appender-ref ref="ErrorLog"/>  
                  <appender-ref ref="Console"/>  
              </logger>  
                
            <logger name="druid.sql.Statement" level="debug" additivity="false">
              <appender-ref ref="Console"/>
              <appender-ref ref="RollingFileName"/>
            </logger>
              <root level="info" includeLocation="true">
                  <appender-ref ref="ErrorLog"/>
                  <appender-ref ref="Console"/>  
              </root>  
          </Loggers>  
      </Configuration>

### 三、在web.xml中配置log4j2的加载启动 ###

<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>

注：加上上述配置后，就能在项目启动是加载log4j2

### 四、在Mybatis的配置文件中，加入上述配置 ###

注：settings配置完毕后，即可实现SQL语句的打印！控制台打印如下结果：

2017-10-23 16:38:01,021 DEBUG (BaseJdbcLogger.java:145) - ==>  Preparing: SELECT count(*) FROM t_user 
    2017-10-23 16:38:01,056 DEBUG (BaseJdbcLogger.java:145) - ==> Parameters: 
    2017-10-23 16:38:01,084 DEBUG (BaseJdbcLogger.java:145) - <==      Total: 1

### 五、实现Mybatis官方提供的拦截器，用于记录SQL语句的执行时间 ###

package com.stu.interceptor;
    
    import java.sql.Statement;
    import java.util.Properties;
    
    import org.apache.ibatis.executor.statement.StatementHandler;
    import org.apache.ibatis.plugin.Interceptor;
    import org.apache.ibatis.plugin.Intercepts;
    import org.apache.ibatis.plugin.Invocation;
    import org.apache.ibatis.plugin.Plugin;
    import org.apache.ibatis.plugin.Signature;
    import org.apache.ibatis.session.ResultHandler;
    
    /**
     * Sql执行时间记录拦截器 
     */
    @Intercepts({@Signature(type = StatementHandler.class, method = "query", args = {Statement.class, ResultHandler.class}),
     @Signature(type = StatementHandler.class, method = "update", args = {Statement.class}),
     @Signature(type = StatementHandler.class, method = "batch", args = { Statement.class })})
    public class SqlCostInterceptor implements Interceptor {
     
     @Override
     public Object intercept(Invocation invocation) throws Throwable {
       
      long startTime = System.currentTimeMillis();
      try {
       return invocation.proceed();
      } finally {
       long endTime = System.currentTimeMillis();
       long sqlCost = endTime - startTime;
       System.out.println("执行耗时 : [" + sqlCost + "ms ] ");
      }
     }
     
     @Override
     public Object plugin(Object target) {
      return Plugin.wrap(target, this);
     }
     
     @Override
     public void setProperties(Properties properties) {
       
     }
      
    }

注：Interceptor接口是Mybatis官方提供的拦截接口，创建一个类实现该接口并重写其三个方法并将该类配置在Mybatis的配置文件中，即可拦截SQL语句的执行过程

### 六、将手动编写的拦截器配置在Mybatis配置文件中： ###

<?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>
    	<typeAliases>
    		<package name="com.stu.pojo" />
    	</typeAliases>
    	<plugins>
    		
    		<plugin interceptor="com.stu.interceptor.SqlCostInterceptor" />
    	</plugins>
    
    </configuration>

### 七、测试SQL的控制台打印结果 ###

2017-10-23 16:38:01,091 DEBUG (BaseJdbcLogger.java:145) - ==>  Preparing: select id, username, password, state, isdel, add_time, money, left_money from t_user limit ?,? 
    2017-10-23 16:38:01,093 DEBUG (BaseJdbcLogger.java:145) - ==> Parameters: 0(Integer), 15(Integer)
    2017-10-23 16:38:01,128 DEBUG (BaseJdbcLogger.java:145) - <==      Total: 15
    执行耗时 : [36ms ]