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
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~
环境：spring boot 1.5、JDK1.8
# 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
org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder
public DataSource build() {
Class<? extends DataSource> type = this.getType();
DataSource result = (DataSource)BeanUtils.instantiate(type);
this.maybeGetDriverClassName();
this.bind(result);
return result;
}
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" };
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。
