Mybatis中日志工厂LOG4J的使用步骤

1.导入jar包

<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>

2.新建一个配置文件log4j.properties

#将等级为DEBUG的日志信息输出到console和file这两个目的地，console和file的定义在下面的代码
log4j.rootLogger=DEBUG,console,file

#控制台输出的相关设置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n

#文件输出的相关设置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/joe.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n

#日志输出级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

3.在主配置文件中，通过settings标签设置日志文件类型

<settings>
    <setting name="logImpl" value="LOG4J"/>
</settings>

4.在使用log4j的类中新建一个静态对象，

4.1：注意要导对包org.apche.log4j.Logger;

4.2：日志对象，参数为当前类的class    (UserMapperTest.class)

package com.joe.dao;

import com.joe.pojo.User;
import com.joe.utils.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.Test;


public class UserMapperTest {
    static Logger logger = Logger.getLogger(UserMapperTest.class);
    @Test
    public void getUserByIDTest(){
        SqlSession sqlSession = MyBatisUtil.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User userByID = mapper.getUserByID(1);
        System.out.println(userByID);
        sqlSession.close();
    }
    @Test
    public void testLog4j(){
        logger.info("info:进入了testlog4j");
        logger.debug("debug:进入了testLog4j");
        logger.error("error:进入了testLog4j");
    }
}

5.在代码中加一句日志信息，可以选择info类型，也可以选择debug或error类型{logger.info(),logger.debug(),logger.error()}

package com.joe.dao;

import com.joe.pojo.User;
import com.joe.utils.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.Test;


public class UserMapperTest {
    static Logger logger = Logger.getLogger(UserMapperTest.class);
    @Test
    public void getUserByIDTest(){
        SqlSession sqlSession = MyBatisUtil.getSqlSession();

        logger.info("测试，进入getUserByIDtest方法成功！");

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User userByID = mapper.getUserByID(1);
        System.out.println(userByID);
        sqlSession.close();
    }
    @Test
    public void testLog4j(){
        logger.info("info:进入了testlog4j");
        logger.debug("debug:进入了testLog4j");
        logger.error("error:进入了testLog4j");
    }
}

6.执行成功后，控制台会打印log4j日志信息，并且之前我们在配置文件中设置了让打印的log日志保存到项目的当前路径下

可以看到，我这里多了一个lt.log文件，里面清晰的写出了每一句日志的级别，刚才我们自定义的info日志也在其中~~~

[DEBUG][20-05-04][org.apache.ibatis.logging.LogFactory]Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
[DEBUG][20-05-04][org.apache.ibatis.logging.LogFactory]Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
[DEBUG][20-05-04][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[DEBUG][20-05-04][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[DEBUG][20-05-04][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[DEBUG][20-05-04][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[INFO][20-05-04][com.joe.dao.UserMapperTest]测试，进入getUserByIDtest方法成功！
[DEBUG][20-05-04][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Opening JDBC Connection
[DEBUG][20-05-04][org.apache.ibatis.datasource.pooled.PooledDataSource]Created connection 660879561.
[DEBUG][20-05-04][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@276438c9]
[DEBUG][20-05-04][com.joe.dao.UserMapper.getUserByID]==>  Preparing: select * from user where id = ? 
[DEBUG][20-05-04][com.joe.dao.UserMapper.getUserByID]==> Parameters: 1(Integer)
[DEBUG][20-05-04][com.joe.dao.UserMapper.getUserByID]<==      Total: 1
[DEBUG][20-05-04][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@276438c9]
[DEBUG][20-05-04][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@276438c9]
[DEBUG][20-05-04][org.apache.ibatis.datasource.pooled.PooledDataSource]Returned connection 660879561 to pool.

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版权声明：本文为CSDN博主「刘桐ssss」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/delicious_life/article/details/105660519