參考資料:
https://logging.apache.org/log4j/2.x/manual/appenders.html#JDBCAppender
環境:
Springboot:2.2.3.RELEASE
特殊依賴:org.springframework.boot:spring-boot-starter-log4j2:2.2.2.RELEASE
日誌框架:
門面框架:self4j :1.7.30
實現框架:JUL、log4j :2.12.1 (自帶logback已去除)
橋接: log4j-slf4j :2.12.1
實現:
參考官方資料
官方文檔指出:[需要一個java.sql.Connection]
且已經給出實例:
配置Appenders
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="error">
<Appenders>
<!-- tableName:表名,class:實現獲取Connect的類 method:對應獲取Connect方法 -->
<JDBC name="databaseAppender" tableName="LOGGING.APPLICATION_LOG">
<ConnectionFactory class="net.example.db.ConnectionFactory" method="getDatabaseConnection" />
<!-- literal:原樣映射到SQL中,可以理解爲你寫了啥,sql語句該字段的值就是啥,
舉例:
literal="current_timestamp",翻譯後的SQL爲:
insert into 表名 (EVENT_ID,...) values (current_timestamp,...)
-->
<Column name="EVENT_ID" literal="LOGGING.APPLICATION_LOG_SEQUENCE.NEXTVAL" />
<Column name="EVENT_DATE" isEventTimestamp="true" />
<Column name="LEVEL" pattern="%level" />
<Column name="LOGGER" pattern="%logger" />
<Column name="MESSAGE" pattern="%message" />
<Column name="THROWABLE" pattern="%ex{full}" />
</JDBC>
</Appenders>
<Loggers>
<Root level="warn">
<AppenderRef ref="databaseAppender"/>
</Root>
</Loggers>
</Configuration>
獲取Connection
package net.example.db;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.commons.dbcp.DriverManagerConnectionFactory;
import org.apache.commons.dbcp.PoolableConnection;
import org.apache.commons.dbcp.PoolableConnectionFactory;
import org.apache.commons.dbcp.PoolingDataSource;
import org.apache.commons.pool.impl.GenericObjectPool;
public class ConnectionFactory {
private static interface Singleton {
final ConnectionFactory INSTANCE = new ConnectionFactory();
}
private final DataSource dataSource;
private ConnectionFactory() {
Properties properties = new Properties();
properties.setProperty("user", "logging");
properties.setProperty("password", "abc123"); // or get properties from some configuration file
GenericObjectPool<PoolableConnection> pool = new GenericObjectPool<PoolableConnection>();
DriverManagerConnectionFactory connectionFactory = new DriverManagerConnectionFactory(
"jdbc:mysql://example.org:3306/exampleDb", properties
);
new PoolableConnectionFactory(
connectionFactory, pool, null, "SELECT 1", 3, false, false, Connection.TRANSACTION_READ_COMMITTED
);
this.dataSource = new PoolingDataSource(pool);
}
public static Connection getDatabaseConnection() throws SQLException {
/**
建議在對Connection進行判斷,如果其已經closed就進行重連
*/
return Singleton.INSTANCE.dataSource.getConnection();
}
}
需要注意:
1. Log4j雖然提供了連接池等建議,但是其本身並不管理連接池、事務及自動重連,在獲取Connect時應充分考慮這些因素
2. 一般來說,框架中已經集成了如durid等鏈接數據庫的套件,需要注意的時,Log4j在實際需要寫入日誌的時候,這些框架可能並未加載(或未完成),使用時應注意。
參考實例:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class ConnectionFactory {
private static Connection connection = null;
public static Connection getDatabaseConnection() {
try {
if (connection == null || connection.isClosed()) {
synchronized (ConnectionFactory.class) {
if (connection == null || connection.isClosed()) {
// 修改爲需要存儲的目標數據庫配置,也可以考慮使用連接池等提高可用性及效率
connection = DriverManager.getConnection("jdbc:mysql://**.**.cn:3306/**?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai", "**", "**");
}
}
}
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
}
參考SQL:
create table tbl_log
(
ID int auto_increment
primary key,
EVENT_DATE datetime null,
LEVEL varchar(20) null,
LOGGER varchar(20) null,
MESSAGE text null,
THROWABLE text null
);
效果: