1、日志
通过使用内置的日志工厂提供日志功能。内置日志工厂将会把日志工作委托给下面的实现之一:
SLF4J
LOG4J 【掌握】
LOG4J2
JDK_LOGGING:JDK记录
COMMONS_LOGGING:日志记录
STDOUT_LOGGING :标准输出记录
NO_LOGGING:没有记录
日志的使用:
<settings> <setting name="logImpl" value="STDOUT_LOGGING"/> </settings>
输出结果:
Logging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter. PooledDataSource forcefully closed/removed all connections. PooledDataSource forcefully closed/removed all connections. PooledDataSource forcefully closed/removed all connections. PooledDataSource forcefully closed/removed all connections. Opening JDBC Connection Created connection 1995616381. Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@76f2b07d] ==> Preparing: /*根据id查询用户*/ select * from mybatis.user where id = ?; ==> Parameters: 1(Integer) <== Columns: id, name, pwd <== Row: 1, zhangsan, 123 <== Total: 1 User{id=1, name='zhangsan', pwd='123'} Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@76f2b07d] Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@76f2b07d] Returned connection 1995616381 to pool.
2、LOG4J
什么是log4j:
- Log4j是Apache的一个开源项目,可以控制日志信息输送的目的地是控制台、文件、GUI组件
- 我们也可以控制每一条日志的输出格式;
- 通过一个配置文件来灵活地进行配置,而不需要修改应用的代码。
要想使用log4j必须:
1、导入log4j对应的jar包(依赖)
<!-- https://mvnrepository.com/artifact/log4j/log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>
2、创建配置文件
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/zhixi.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mybatis配置文件中:配置log4j日志实现
<settings> <setting name="logImpl" value="LOG4J"/> </settings>
3、简单使用:
1、在要使用log4j的类中引入类:import org.apache.log4j.Logger;
2、日志对象,参数是当前类的class
static Logger logger = Logger.getLogger(IUserDaoTest.class);
3、使用:运行测试类即可自动新建日志文件
public class IUserDaoTest { static Logger logger = Logger.getLogger(IUserDaoTest.class); @Test public void getLogTest() { //打印信息 logger.info("info:进入了testLog4j"); logger.debug("debug:进入了testLog4j"); logger.error("error :进入了testLog4j"); } }