springboot不自动初始化数据库连接池
简介
有时候我们想自己动态的初始化数据库连接池，但是springboot 的@SpringBootApplication注解会自动去初始化数据库连接池，不配置的话会启动失败，如下提示
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Dbcp2.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.commons.dbcp2.BasicDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
INFO - Unregistering JMX-exposed beans on shutdown
解决方案
办法就是排除自动初始化的类
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class}) public class Application implements CommandLineRunner { ... }
加上这么一句
(exclude = {DataSourceAutoConfiguration.class})
就可以跳过数据库的自动初始化，自己为所欲为了~
记录下spring boot关于数据库连接池的一个小坑
环境：spring boot 1.5、JDK1.8
application.properties配置
# 驱动配置信息 spring.datasource.url = jdbc:mysql://127.0.0.1:3306/mealsystem?useUnicode=true&characterEncoding=utf-8 spring.datasource.username = root spring.datasource.password = 123456 spring.datasource.driverClassName = com.mysql.jdbc.Driver #连接池的配置信息 spring.datasource.initialSize=5 spring.datasource.minIdle=5 spring.datasource.maxActive=20 spring.datasource.maxWait=60000 spring.datasource.timeBetweenEvictionRunsMillis=60000 spring.datasource.minEvictableIdleTimeMillis=300000 spring.datasource.validationQuery=SELECT 1 FROM DUAL spring.datasource.testWhileIdle=true spring.datasource.testOnBorrow=false spring.datasource.testOnReturn=false spring.datasource.poolPreparedStatements=true spring.datasource.maxPoolPreparedStatementPerConnectionSize=20 spring.datasource.filters=stat,wall,log4j spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
先找到这个类
org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder
在下面的源码中打个断点
public DataSource build() { Class<? extends DataSource> type = this.getType(); DataSource result = (DataSource)BeanUtils.instantiate(type); this.maybeGetDriverClassName(); this.bind(result); return result; }
启动项目
我们可以发现，在没有配置spring.datasource.type时，spring boot默认的连接池是tomcat-jdbc
也就是说我们在application.properties中配置的连接池参数是无效的。
好，那我们再配置下这个属性，使用阿里巴巴的druid
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
再启动下
再来看看1.5版本org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder的源码
private static final String[] DATA_SOURCE_TYPE_NAMES = new String[] { "org.apache.tomcat.jdbc.pool.DataSource", "com.zaxxer.hikari.HikariDataSource", "org.apache.commons.dbcp.BasicDataSource", // deprecated "org.apache.commons.dbcp2.BasicDataSource" };
- spring boot 1.5的版本默认连接池为tomcat-jdbc
- spring boot 2.0的版本默认连接池为HikariCP
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/x356982611/article/details/95355406
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