在Spring Boot中配置动态数据源需要使用多数据源配置。以下是配置动态数据源的步骤：

在pom.xml中引入依赖：

<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>

创建多个数据源配置类，每个配置类包含相应的数据源配置信息：

@Configurationpublic class DataSourceConfig1 {@Bean(name = "dataSource1")@ConfigurationProperties(prefix = "spring.datasource.ds1")public DataSource dataSource1() {return DataSourceBuilder.create().build();}}@Configurationpublic class DataSourceConfig2 {@Bean(name = "dataSource2")@ConfigurationProperties(prefix = "spring.datasource.ds2")public DataSource dataSource2() {return DataSourceBuilder.create().build();}}

创建动态数据源配置类，并设置默认数据源：

@Configurationpublic class DynamicDataSourceConfig {@Bean@Primarypublic 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;}}

创建数据源切换类，用于根据需求动态切换数据源：

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();}}

创建数据源切换切面类，实现切换数据源的逻辑：

@Aspect@Componentpublic 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();}}

在需要切换数据源的方法上添加@DataSource注解，指定要切换的数据源：

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

通过以上步骤，就可以实现在Spring Boot中配置动态数据源。在需要切换数据源的方法上添加@DataSource注解即可动态切换数据源。