在Spring Boot中配置動態數據源需要使用多數據源配置。以下是配置動態數據源的步驟：

1. 在pom.xml中引入依賴：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>com.zaxxer</groupId>
    <artifactId>HikariCP</artifactId>
</dependency>

2. 創建多個數據源配置類，每個配置類包含相應的數據源配置信息：

@Configuration
public class DataSourceConfig1 {

    @Bean(name = "dataSource1")
    @ConfigurationProperties(prefix = "spring.datasource.ds1")
    public DataSource dataSource1() {
        return DataSourceBuilder.create().build();
    }
}

@Configuration
public class DataSourceConfig2 {

    @Bean(name = "dataSource2")
    @ConfigurationProperties(prefix = "spring.datasource.ds2")
    public DataSource dataSource2() {
        return DataSourceBuilder.create().build();
    }
}

3. 創建動態數據源配置類，并設置默認數據源：

@Configuration
public class DynamicDataSourceConfig {

    @Bean
    @Primary
    public DataSource dynamicDataSource(@Qualifier("dataSource1") DataSource dataSource1,
                                        @Qualifier("dataSource2") DataSource dataSource2) {
        DynamicRoutingDataSource dynamicDataSource = new DynamicRoutingDataSource();
        Map<Object, Object> dataSourceMap = new HashMap<>();
        dataSourceMap.put("dataSource1", dataSource1);
        dataSourceMap.put("dataSource2", dataSource2);
        dynamicDataSource.setDefaultTargetDataSource(dataSource1);
        dynamicDataSource.setTargetDataSources(dataSourceMap);
        return dynamicDataSource;
    }
}

4. 創建數據源切換類，用于根據需求動態切換數據源：

public class DataSourceContextHolder {

    private static final ThreadLocal<String> contextHolder = new ThreadLocal<>();

    public static void setDataSource(String dataSource) {
        contextHolder.set(dataSource);
    }

    public static String getDataSource() {
        return contextHolder.get();
    }

    public static void clearDataSource() {
        contextHolder.remove();
    }
}

5. 創建數據源切換切面類，實現切換數據源的邏輯：

@Aspect
@Component
public class DataSourceAspect {

    @Pointcut("@annotation(com.example.demo.annotation.DataSource)")
    public void dataSourcePointcut() {
    }

    @Before("dataSourcePointcut() && @annotation(dataSource)")
    public void switchDataSource(JoinPoint joinPoint, DataSource dataSource) {
        DataSourceContextHolder.setDataSource(dataSource.value());
    }

    @After("dataSourcePointcut()")
    public void restoreDataSource(JoinPoint joinPoint) {
        DataSourceContextHolder.clearDataSource();
    }
}

6. 在需要切換數據源的方法上添加@DataSource注解，指定要切換的數據源：

@DataSource("dataSource2")
public void test() {
    // 方法體
}

通過以上步驟，就可以實現在Spring Boot中配置動態數據源。在需要切換數據源的方法上添加@DataSource注解即可動態切換數據源。