MyBatis的日志工厂 | MyBatis系列
前言
在实际开发中,项目上线之后,如果发生问题,我们定位问题不可能一直去看控制台日志(即nohup文件),正确的做法当然是看日志啦!
logImpl 指定 MyBatis 所用日志的具体实现,未指定时将自动查找。 SLF4J | LOG4J | LOG4J2 | JDK_LOGGING | COMMONS_LOGGING | STDOUT_LOGGING | NO_LOGGING 未设置 MyBatis支持多种日志工厂:
SLF4J
LOG4J 【重点】
LOG4J2
JDK_LOGGING
COMMONS_LOGGING
STDOUT_LOGGING 【重点】
NO_LOGGING
在这里只介绍
LOG4J
和STDOUT_LOGGING
其他的工作中用的少,有兴趣的同学可以自行研究一下!
一、STDOUT_LOGGING 日志
这个比较简单,无需引入jar包啥的,内置的日志工厂!
我们先看下,不加日志工厂的话控制台会输出哪些内容:
位置不要放错哦~ 还记得上一篇的位置吧,哈哈
具体代码如下:
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
复制代码再次运行结果如下:
Class not found: org.jboss.vfs.VFS
JBoss 6 VFS API is not available in this environment.
Class not found: org.jboss.vfs.VirtualFile
VFS implementation org.apache.ibatis.io.JBoss6VFS is not valid in this environment.
Using VFS adapter org.apache.ibatis.io.DefaultVFS
Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo
Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo
Reader entry: User.class
Listing file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo
Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo/User.class
Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo/User.class
Reader entry: ���� 4 m
Checking to see if class com.dy.pojo.User matches criteria [is assignable to Object]
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper
Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper
Reader entry: UserMapper.class
Reader entry: UserMapper.xml
Listing file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper
Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.class
Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.class
Reader entry: ���� 4
Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.xml
Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.xml
Reader entry: <?xml version="1.0" encoding="UTF-8" ?>
Checking to see if class com.dy.mapper.UserMapper matches criteria [is assignable to Object]
Opening JDBC Connection
Created connection 1159114532.
Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4516af24]
==> Preparing: select * from user
==> Parameters:
<== Columns: id, name, age, like
<== Row: 30, 丁大大, 23, 钓鱼
<== Row: 31, 面条, 22, 王者荣耀
<== Row: 32, 面条, 50, 王者荣耀
<== Total: 3
User(id=30, name=丁大大, age=23, like=钓鱼)
User(id=31, name=面条, age=22, like=王者荣耀)
User(id=32, name=面条, age=50, like=王者荣耀)
Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4516af24]
Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@4516af24]
Returned connection 1159114532 to pool.
Process finished with exit code 0
复制代码主要看以下内容:
Opening JDBC Connection //打开一个JDBC链接
Created connection 1159114532. //创建链接
Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4516af24]
//在JDBC Connection上将自动提交设置为false
==> Preparing: select * from user //查询语句
==> Parameters: //查询参数
<== Columns: id, name, age, like
//下面是结果
<== Row: 30, 丁大大, 23, 钓鱼
<== Row: 31, 面条, 22, 王者荣耀
<== Row: 32, 面条, 50, 王者荣耀
<== Total: 3
复制代码现在我们练习的项目很小,sql啥的比较少,出问题很容易找到。
但是在实际开发过程中,项目大,sql多,不看日志定位问题的话比较耗时耗力!
所以推荐大家从一开始就要养成配置日志工厂的习惯!这对我们定位问题有很大的帮助!!!
二、LOG4J 日志
①、MyBatis中使用
什么是Log4j?
有问题不懂找百度 百度百科
Log4j是Apache的一个开源项目,通过使用Log4j,我们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
通过定义每一条日志信息的级别,我们能够更加细致地控制日志的生成过程
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。
这个就不是内置的日志了,先导包:
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
复制代码更改核心配置文件
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
复制代码新增log4j.properties配置文件
首页可以发现,我们的项目中出现了一个新的目录:
log
,目录下的就是我们的日志文件dayu.log
打开瞅瞅里面是啥?
[DEBUG][21-07-08][org.apache.ibatis.logging.LogFactory]Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
[DEBUG][21-07-08][org.apache.ibatis.logging.LogFactory]Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
[DEBUG][21-07-08][org.apache.ibatis.io.VFS]Class not found: org.jboss.vfs.VFS
[DEBUG][21-07-08][org.apache.ibatis.io.JBoss6VFS]JBoss 6 VFS API is not available in this environment.
[DEBUG][21-07-08][org.apache.ibatis.io.VFS]Class not found: org.jboss.vfs.VirtualFile
[DEBUG][21-07-08][org.apache.ibatis.io.VFS]VFS implementation org.apache.ibatis.io.JBoss6VFS is not valid in this environment.
[DEBUG][21-07-08][org.apache.ibatis.io.VFS]Using VFS adapter org.apache.ibatis.io.DefaultVFS
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Reader entry: User.class
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Listing file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo/User.class
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/pojo/User.class
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Reader entry: ���� 4 m
[DEBUG][21-07-08][org.apache.ibatis.io.ResolverUtil]Checking to see if class com.dy.pojo.User matches criteria [is assignable to Object]
[DEBUG][21-07-08][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[DEBUG][21-07-08][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[DEBUG][21-07-08][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[DEBUG][21-07-08][org.apache.ibatis.datasource.pooled.PooledDataSource]PooledDataSource forcefully closed/removed all connections.
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Reader entry: UserMapper.class
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Reader entry: UserMapper.xml
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Listing file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.class
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.class
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Reader entry: ���� 4
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Find JAR URL: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.xml
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Not a JAR: file:/D:/workSpace/dyj-MyBatis-Project/MyBatis-01-properties/target/classes/com/dy/mapper/UserMapper.xml
[DEBUG][21-07-08][org.apache.ibatis.io.DefaultVFS]Reader entry: <?xml version="1.0" encoding="UTF-8" ?>
[DEBUG][21-07-08][org.apache.ibatis.io.ResolverUtil]Checking to see if class com.dy.mapper.UserMapper matches criteria [is assignable to Object]
[DEBUG][21-07-08][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Opening JDBC Connection
[DEBUG][21-07-08][org.apache.ibatis.datasource.pooled.PooledDataSource]Created connection 624271064.
[DEBUG][21-07-08][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@25359ed8]
[DEBUG][21-07-08][com.dy.mapper.UserMapper.getUserInfo]==> Preparing: select * from user
[DEBUG][21-07-08][com.dy.mapper.UserMapper.getUserInfo]==> Parameters:
[DEBUG][21-07-08][com.dy.mapper.UserMapper.getUserInfo]<== Total: 3
[DEBUG][21-07-08][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@25359ed8]
[DEBUG][21-07-08][org.apache.ibatis.transaction.jdbc.JdbcTransaction]Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@25359ed8]
[DEBUG][21-07-08][org.apache.ibatis.datasource.pooled.PooledDataSource]Returned connection 624271064 to pool.
复制代码再看控制台输出的:这里只截取了重点日志信息。
[org.apache.ibatis.transaction.jdbc.JdbcTransaction]-Opening JDBC Connection
[org.apache.ibatis.datasource.pooled.PooledDataSource]-Created connection 624271064.
[org.apache.ibatis.transaction.jdbc.JdbcTransaction]-Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@25359ed8]
[com.dy.mapper.UserMapper.getUserInfo]-==> Preparing: select * from user
[com.dy.mapper.UserMapper.getUserInfo]-==> Parameters:
[com.dy.mapper.UserMapper.getUserInfo]-<== Total: 3
User(id=30, name=丁大大, age=23, like=钓鱼)
User(id=31, name=面条, age=22, like=王者荣耀)
User(id=32, name=面条, age=50, like=王者荣耀)
[org.apache.ibatis.transaction.jdbc.JdbcTransaction]-Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@25359ed8]
[org.apache.ibatis.transaction.jdbc.JdbcTransaction]-Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@25359ed8]
[org.apache.ibatis.datasource.pooled.PooledDataSource]-Returned connection 624271064 to pool.
Process finished with exit code 0
复制代码#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/dayu.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
复制代码执行看结果:
清清爽爽,一目了然!程序的所有执行信息都成功打印出来了!
②、正常项目中业务层使用
先使用静态引入包
static Logger logger = Logger.getLogger(MyTest.class); //这个MyTest.class要和当前所在类名称保持一致!
复制代码注意,这里导包不要导错了,一定要是
import org.apache.log4j.Logger;
,看图说话业务层:
@Test
public void selectUser1() {
logger.info("我是info日志");
logger.error("我是error日志");
logger.debug("我是debug日志");
}
复制代码执行瞅瞅结果:
控制台输出:
日志文件追加:
哪里需要打日志可以直接打出来,方便后面出问题好定位!比我们debug排查问题要快很多吧!哈哈哈!
③、log4j.properties配置文件配置详细解释
这些网络上都能找到,而且特别杂,我们不可能记住所有的内容。
只需要记住一些重点的东西!然后将其记到自己的小本本上,后面哪里需要用到直接capy过来即可。因为都是固定的格式的!
这里只提供一个通用的简单模板,具体需要配置啥自己去log4j百度百科自行查找,上面解释的很详细!
模板:
#设置日志级别,设定日志记录的最低级别,可设的值有OFF、FATAL、ERROR、WARN、INFO、DEBUG、ALL或者自定义组别,Log4j建议只使用中间四个级别。
log4j.rootLogger=DEBUG,console,file
######### 输出到控制台 ####################
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
######### 输出到文件 ####################
log4j.appender.file = org.apache.log4j.RollingFileAppender
###这里指定目录
log4j.appender.file.File=./log/dayu.log
log4j.appender.file.MaxFileSize=10mb
##输出DEBUG级别以上的日志
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
复制代码
作者:大鱼丶
链接:https://juejin.cn/post/6986451654765707295
来源:掘金
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