日誌

1 日誌工廠

如果一個數據庫操作，出現了異常，我們需要排錯。日誌就是最好的助手！

曾經：sout、debug

現在：日誌工廠

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SLF4J
LOG4J【掌握】
LOG4J2
JDK_LOGGING
COMMONS_LOGGING
STDOUT_LOGGING【掌握】
NO_LOGGING

在Mybatis中具體使用那個日誌實現，在設置中設定！

STDOUT_LOGGING標準日誌輸出

在mybatis核心配置文件中，配置我們的日誌！

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


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

LOG4J粘貼過來可能自帶空格，一定要注意

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2 Log4j

什麼事log4j

Log4j是Apache的一個開源項目，通過使用Log4j，我們可以控制日誌信息輸送的目的地是控制檯、文件、GUI組件
我們也可以控制每一條日誌的輸出格式
通過定義每一條日誌信息的級別，我們能夠更加細緻地控制日誌的生成過程。
通過一個配置文件來靈活地進行配置，而不需要修改應用的代碼。

1.先導入log4j的包

    <dependencies>
        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    </dependencies>

2.log4j.properties(在resources包下面建立一個log4j.properties,在創建的文件中輸入下面的代碼)

輸入下面的代碼之後，控制檯會按照我們想要的格式進行輸出

log4j.rootLogger=DEBUG,console,logFile
log4j.additivity.org.apache=true
# 控制檯(console)
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.ImmediateFlush=true
log4j.appender.console.Target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n
# 日誌文件(logFile)
log4j.appender.logFile=org.apache.log4j.FileAppender
log4j.appender.logFile.Threshold=DEBUG
log4j.appender.logFile.ImmediateFlush=true
log4j.appender.logFile.Append=true
log4j.appender.logFile.File=D:/logs/log.log4j
log4j.appender.logFile.layout=org.apache.log4j.PatternLayout
log4j.appender.logFile.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n
# 回滾文件(rollingFile)
log4j.appender.rollingFile=org.apache.log4j.RollingFileAppender
log4j.appender.rollingFile.Threshold=DEBUG
log4j.appender.rollingFile.ImmediateFlush=true
log4j.appender.rollingFile.Append=true
log4j.appender.rollingFile.File=D:/logs/log.log4j
log4j.appender.rollingFile.MaxFileSize=200KB
log4j.appender.rollingFile.MaxBackupIndex=50
log4j.appender.rollingFile.layout=org.apache.log4j.PatternLayout
log4j.appender.rollingFile.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n
# 定期回滾日誌文件(dailyFile)
log4j.appender.dailyFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.dailyFile.Threshold=DEBUG
log4j.appender.dailyFile.ImmediateFlush=true
log4j.appender.dailyFile.Append=true
log4j.appender.dailyFile.File=D:/logs/log.log4j
log4j.appender.dailyFile.DatePattern='.'yyyy-MM-dd
log4j.appender.dailyFile.layout=org.apache.log4j.PatternLayout
log4j.appender.dailyFile.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n
# 應用於socket
log4j.appender.socket=org.apache.log4j.RollingFileAppender
log4j.appender.socket.RemoteHost=localhost
log4j.appender.socket.Port=5001
log4j.appender.socket.LocationInfo=true
# Set up for Log Factor 5
log4j.appender.socket.layout=org.apache.log4j.PatternLayout
log4j.appender.socket.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n
# Log Factor 5 Appender
log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender
log4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000
# 發送日誌到指定郵件
log4j.appender.mail=org.apache.log4j.net.SMTPAppender
log4j.appender.mail.Threshold=FATAL
log4j.appender.mail.BufferSize=10
log4j.appender.mail.From = [email protected]
log4j.appender.mail.SMTPHost=mail.com
log4j.appender.mail.Subject=Log4J Message
log4j.appender.mail.To= [email protected]
log4j.appender.mail.layout=org.apache.log4j.PatternLayout
log4j.appender.mail.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n
# 應用於數據庫
log4j.appender.database=org.apache.log4j.jdbc.JDBCAppender
log4j.appender.database.URL=jdbc:mysql://localhost:3306/test
log4j.appender.database.driver=com.mysql.jdbc.Driver
log4j.appender.database.user=root
log4j.appender.database.password=
log4j.appender.database.sql=INSERT INTO LOG4J (Message) VALUES('=[%-5p] %d(%r) --> [%t] %l: %m %x %n')
log4j.appender.database.layout=org.apache.log4j.PatternLayout
log4j.appender.database.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

# 自定義Appender
log4j.appender.im = net.cybercorlin.util.logger.appender.IMAppender
log4j.appender.im.host = mail.cybercorlin.net
log4j.appender.im.username = username
log4j.appender.im.password = password
log4j.appender.im.recipient = [email protected]
log4j.appender.im.layout=org.apache.log4j.PatternLayout
log4j.appender.im.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

關於這個點一定要好好看看，不需要記住，但是一定要懂

3.配置log4j爲日誌實現

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

4.log4j的使用！直接測試運行剛纔的查詢

DEBUG [main] (LogFactory.java:105) - Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
DEBUG [main] (LogFactory.java:105) - Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
DEBUG [main] (PooledDataSource.java:353) - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] (PooledDataSource.java:353) - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] (PooledDataSource.java:353) - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] (PooledDataSource.java:353) - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] (JdbcTransaction.java:136) - Opening JDBC Connection
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
DEBUG [main] (PooledDataSource.java:424) - Created connection 2049051802.
DEBUG [main] (JdbcTransaction.java:100) - Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@7a220c9a]
DEBUG [main] (BaseJdbcLogger.java:143) - ==>  Preparing: /*定義sql*/ select * from mybatis.user where id = ?; 
DEBUG [main] (BaseJdbcLogger.java:143) - ==> Parameters: 1(Integer)
DEBUG [main] (BaseJdbcLogger.java:143) - <==      Total: 1
User{id=1, name='狂神', password='123456'}
DEBUG [main] (JdbcTransaction.java:122) - Resetting autocommit to true on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@7a220c9a]
DEBUG [main] (JdbcTransaction.java:90) - Closing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@7a220c9a]
DEBUG [main] (PooledDataSource.java:381) - Returned connection 2049051802 to pool.


Disconnected from the target VM, address: '127.0.0.1:58296', transport: 'socket'

Process finished with exit code 0

簡單使用

在要使用Log4j 的類中，導入org.apache.log4j.Logger;

日誌對象，加載參數爲當前類的class

 static Logger logger = Logger.getLogger(UserDaoTest.class);


UserDaoTest是當前的類

日誌級別

logger.info("info:進入了testLog4j方法");
logger.debug("debug:進入了testLog4j");
logger.error("error:進入了testLog4j");

日誌及其使用

日誌

1 日誌工廠

2 Log4j

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