最近做项目需要连两个不同地址的数据库，于是研究了一下Spring Boot如何配置多数据源。

• 在application.properties配置

#主数据源
primary.spring.datasource.type =
primary.spring.datasource.driver-class-name =
primary.spring.datasource.url =
primary.spring.datasource.username =
primary.spring.datasource.password =
#其他数据源
secondary.spring.datasource.type =
secondary.spring.datasource.driver-class-name =
secondary.spring.datasource.url =
secondary.spring.datasource.username =
secondary.spring.datasource.password =

• @Configuration进行自定义配置
  这里我将需要连主数据源mybatis中的mapper文件放在online.chenke.primary包中，第二个数据源放在online.chenke.secondary包中
  • 在DataSourceConfig中配置主数据源

@Configuration
@MapperScan(value = "online.chenke.primary", sqlSessionFactoryRef =  "sessionFactory")
public class DataSourceConfig {
    @Value("${primary.spring.datasource.type}")
    private Class<? extends DataSource> dataSourceType;

    @Bean("dataSourceProperties")
    @Primary
    @ConfigurationProperties("primary.spring.datasource")
    public DataSourceProperties dataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean("dataSource")
    @Primary
    @ConfigurationProperties("primary.spring.datasource")
    public DataSource dataSource(@Qualifier("dataSourceProperties") DataSourceProperties dataSourceProperties) {
        return dataSourceProperties.initializeDataSourceBuilder().type(dataSourceType).build();
    }

    @Bean("sessionFactory")
    @Primary
    @ConfigurationProperties("primary.spring.datasource")
    public SqlSessionFactory sessionFactory(@Qualifier("dataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);

        return sqlSessionFactoryBean.getObject();
    }
}

• 在SecondaryDataSourceConfig中配置第二个数据源

@Configuration
@MapperScan(value = "online.chenke.secondary", sqlSessionFactoryRef =  "secondarySessionFactory")
public class SecondaryDataSourceConfig {
    @Value("${secondary.spring.datasource.type}")
    private Class<? extends DataSource> dataSourceType;

    @Bean("secondaryDataSourceProperties")
    @ConfigurationProperties("secondary.spring.datasource")
    public DataSourceProperties dataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean("secondaryDataSource")
    @ConfigurationProperties("secondary.spring.datasource")
    public DataSource dataSource(@Qualifier("secondaryDataSourceProperties") DataSourceProperties dataSourceProperties) {
        return dataSourceProperties.initializeDataSourceBuilder().type(dataSourceType).build();
    }

    @Bean("secondarySessionFactory")
    @ConfigurationProperties("secondary.spring.datasource")
    public SqlSessionFactory sessionFactory(@Qualifier("secondaryDataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);

        return sqlSessionFactoryBean.getObject();
    }
}

配置完成，正常使用即可