最近我的项目须要又从新温习了下 springboot，对于 springboot 配置多数据源，做了笔记，分享给有须要的小伙伴们，视频看的能源节点王鹤老师讲的，
能源节点王鹤老师解说的 springboot 教程，由浅入深，带你体验 Spring Boot 的极速开发过程，内容丰盛，涵盖了 SpringBoot 开发的方方面面，并且同步更新到 Spring Boot 2.x 系列的最新版本。
视频链接：
https://www.bilibili.com/vide…
一、目录构造
目录构造
二、依赖包（pom.xml）
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.2</version>
</dependency>
</dependencies>三、配置文件
server:
port: 8080
spring:
datasource:
first:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://localhost:3306/first?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: root
second:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://localhost:3306/second?useUnicode=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 {
/**
* 第一个数据连贯，默认优先级最高
* @return
*/
@Bean(name = "dataSourceFirst")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.first")
public DataSource dataSourceFirst() {
// 这种形式的配置默认只满足 spring 的配置形式，如果应用其余数据连贯（druid）, 须要本人独立获取配置
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();}
}阐明：其实这里配置曾经实现了，这里就配置了两个数据源了。能够退出对应的 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 的相干配置
*/
@Configuration
@EntityScan(basePackages = "com.cetc.domain.first")
//1、实体扫描
//2、实体治理 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，能够不加 Qualifier
@Autowired
@Qualifier("dataSourceFirst")
private DataSource dataSource;
//jpa 其余参数配置
@Autowired
private JpaProperties jpaProperties;
// 实体治理工厂 builder
@Autowired
private EntityManagerFactoryBuilder factoryBuilder;
/**
* 配置第一个实体治理工厂的 bean
* @return
*/
@Bean(name = "firstEntityManagerFactoryBean")
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {return factoryBuilder.dataSource(dataSource)
// 这一行的目标是退出 jpa 的其余配置参数比方（ddl-auto: update 等）// 当然这个参数配置能够在事务配置的时候也能够
.properties(jpaProperties.getHibernateProperties(new HibernateSettings()))
.packages("com.cetc.domain.first")
.persistenceUnit("firstPersistenceUnit")
.build();}
/**
* EntityManager 不过解释，用过 jpa 的应该都理解
* @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 的相干配置
*/
@Configuration
@EntityScan(basePackages = "com.cetc.domain.second")
//1、实体扫描
//2、实体治理 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 其余参数配置
@Autowired
private JpaProperties jpaProperties;
// 实体治理工厂 builder
@Autowired
private EntityManagerFactoryBuilder factoryBuilder;
/**
* 配置第二个实体治理工厂的 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 的应该都理解
* @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;
}
}