关于springboot配置多数据源，整理了这篇笔记，分享给有需要的小伙伴们，视频看的动力节点王鹤老师讲的springboot
视频资源：https://www.bilibili.com/video/BV1XQ4y1m7ex
一、目录结构
目录结构
二、依赖包（pom.xml）
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-data-jpa
mysql
mysql-connector-java
org.springframework.boot
spring-boot-configuration-processor
true
org.projectlombok
lombok
1.18.2
三、配置文件
server:
port: 8080
spring:
datasource:
first:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://localhost:3306/firstuseUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: root
second:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://localhost:3306/seconduseUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: root
jpa:
hibernate:
ddl-auto: update
naming:
physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy
show-sql: true
database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
database: mysql
四、多数据源配置（jpa）
1. DataSourceConfiguration
package com.cetc.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
/**
* 数据库配置
*/
@Configuration
public class DataSourceConfiguration {
/**
* 第一个数据连接，默认优先级最高
* @return
*/
@Bean(name = “dataSourceFirst”)
@Primary
@ConfigurationProperties(prefix = “spring.datasource.first”)
public DataSource dataSourceFirst() {
//这种方式的配置默认只满足spring的配置方式，如果使用其他数据连接（druid）,需要自己独立获取配置
return DataSourceBuilder.create().build();
}
/**
* 第二个数据源
* @return
*/
@Bean(name = “dataSourceSecond”)
@ConfigurationProperties(prefix = “spring.datasource.second”)
public DataSource dataSourceSecond() {
return DataSourceBuilder.create().build();
}
}
说明：其实这里配置已经完成了，这里就配置了两个数据源了。可以加入对应的JdbcTemplate,这里不做介绍，比较简单
2. JpaFirstConfiguration
package com.cetc.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
/**
* 第一个数据源，jpa的相关配置
*/
@Configuration
@EntityScan(basePackages = “com.cetc.domain.first”)
//1、实体扫描
//2、实体管理ref
//3、事务管理
@EnableJpaRepositories(
basePackages = “com.cetc.repository.first”,
entityManagerFactoryRef = “firstEntityManagerFactoryBean”,
transactionManagerRef = “firstTransactionManager”)
@EnableTransactionManagement
public class JpaFirstConfiguration {
//第一个数据源，可以不加Qualifier
@Autowired
@Qualifier(“dataSourceFirst”)
private DataSource dataSource;
//jpa其他参数配置
@Autowired
private JpaProperties jpaProperties;
//实体管理工厂builder
@Autowired
private EntityManagerFactoryBuilder factoryBuilder;
/**
* 配置第一个实体管理工厂的bean
* @return
*/
@Bean(name = “firstEntityManagerFactoryBean”)
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
return factoryBuilder.dataSource(dataSource)
//这一行的目的是加入jpa的其他配置参数比如（ddl-auto: update等）
//当然这个参数配置可以在事务配置的时候也可以
.properties(jpaProperties.getHibernateProperties(new HibernateSettings()))
.packages(“com.cetc.domain.first”)
.persistenceUnit(“firstPersistenceUnit”)
.build();
}
/**
* EntityManager不过解释，用过jpa的应该都了解
* @return
*/
@Bean(name = “firstEntityManager”)
@Primary
public EntityManager entityManager() {
return entityManagerFactoryBean().getObject().createEntityManager();
}
/**
* jpa事务管理
* @return
*/
@Bean(name = “firstTransactionManager”)
@Primary
public JpaTransactionManager transactionManager() {
JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();
jpaTransactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject());
return jpaTransactionManager;
}
}
3. JpaSecondConfiguration
package com.cetc.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
/**
* 第二个数据源，jpa的相关配置
*/
@Configuration
@EntityScan(basePackages = “com.cetc.domain.second”)
//1、实体扫描
//2、实体管理ref
//3、事务管理
@EnableJpaRepositories(
basePackages = “com.cetc.repository.second”,
entityManagerFactoryRef = “secondEntityManagerFactoryBean”,
transactionManagerRef = “secondTransactionManager”)
@EnableTransactionManagement
public class JpaSecondConfiguration {
//第二个数据源，必须加Qualifier
@Autowired
@Qualifier(“dataSourceSecond”)
private DataSource dataSource;
//jpa其他参数配置
@Autowired
private JpaProperties jpaProperties;
//实体管理工厂builder
@Autowired
private EntityManagerFactoryBuilder factoryBuilder;
/**
* 配置第二个实体管理工厂的bean
* @return
*/
@Bean(name = “secondEntityManagerFactoryBean”)
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
return factoryBuilder.dataSource(dataSource)
.properties(jpaProperties.getHibernateProperties(new HibernateSettings()))
.packages(“com.cetc.domain.second”)
.persistenceUnit(“secondPersistenceUnit”)
.build();
}
/**
* EntityManager不过解释，用过jpa的应该都了解
* @return
*/
@Bean(name = “secondEntityManager”)
public EntityManager entityManager() {
return entityManagerFactoryBean().getObject().createEntityManager();
}
/**
* jpa事务管理
* @return
*/
@Bean(name = “secondTransactionManager”)
public JpaTransactionManager transactionManager() {
JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();
jpaTransactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject());
return jpaTransactionManager;
}
}
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原文链接：https://blog.csdn.net/f5465245/article/details/123277463