在Spring Boot中配置多个数据源可以通过以下步骤来实现：

1. 在pom.xml文件中添加Spring Boot对多数据源的支持依赖：

   
    org.springframework.boot
    spring-boot-starter-data-jpa
   
   
    com.zaxxer
    HikariCP
   

2. 在application.properties或application.yml配置文件中配置每个数据源的连接信息：

   
   # 数据源1
   spring.datasource.url=jdbc:mysql://localhost:3306/db1
   spring.datasource.username=root
   spring.datasource.password=root

数据源2

spring.datasource.secondary.url=jdbc:mysql://localhost:3306/db2 spring.datasource.secondary.username=root spring.datasource.secondary.password=root

3. 创建多个DataSource bean，分别对应每个数据源：
```java
@Configuration
public class DataSourceConfig {

    @Primary
    @Bean(name = "dataSource")
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }
}

4. 配置JpaVendorAdapter和EntityManagerFactory bean，指定每个数据源的JPA配置：

   @Configuration
   @EnableJpaRepositories(
        basePackages = "com.example.repository", 
        entityManagerFactoryRef = "entityManagerFactory",
        transactionManagerRef = "transactionManager"
   )
   public class JpaConfig {
   
    @Autowired
    @Qualifier("dataSource")
    private DataSource dataSource;
   
    @Autowired
    @Qualifier("secondaryDataSource")
    private DataSource secondaryDataSource;
   
    @Primary
    @Bean(name = "entityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(dataSource)
                .packages("com.example.domain")
                .persistenceUnit("primary")
                .build();
    }
   
    @Bean(name = "secondaryEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean secondaryEntityManagerFactory(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(secondaryDataSource)
                .packages("com.example.domain")
                .persistenceUnit("secondary")
                .build();
    }
   
    @Primary
    @Bean(name = "transactionManager")
    public PlatformTransactionManager transactionManager(
            @Qualifier("entityManagerFactory") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }
   
    @Bean(name = "secondaryTransactionManager")
    public PlatformTransactionManager secondaryTransactionManager(
            @Qualifier("secondaryEntityManagerFactory") EntityManagerFactory secondaryEntityManagerFactory) {
        return new JpaTransactionManager(secondaryEntityManagerFactory);
    }
   }

5. 在需要使用数据源的地方使用@Qualifier注解指定具体的数据源：

   @Service
   public class MyService {
   
    @Autowired
    @Qualifier("entityManagerFactory")
    private EntityManagerFactory entityManagerFactory;
   
    // 使用entityManagerFactory进行数据库操作
   }

通过以上步骤，就可以在Spring Boot中成功配置多个数据源。