springboot动态数据源怎么配置

在Spring Boot中配置动态数据源需要以下步骤：

在pom.xml文件中添加以下依赖：

<dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency>    <groupId>org.apache.commons</groupId>    <artifactId>commons-dbcp2</artifactId>    <version>2.9.0</version></dependency>

创建DataSourceConfig类，用于配置数据源：

@Configurationpublic class DataSourceConfig {        @Bean    @ConfigurationProperties(prefix = "spring.datasource.master")    public DataSource masterDataSource() {        return DataSourceBuilder.create().build();    }        @Bean    @ConfigurationProperties(prefix = "spring.datasource.slave")    public DataSource slaveDataSource() {        return DataSourceBuilder.create().build();    }        @Bean    @Primary    public DynamicDataSource dataSource(DataSource masterDataSource, DataSource slaveDataSource) {        Map<Object, Object> targetDataSources = new HashMap<>();        targetDataSources.put("master", masterDataSource);        targetDataSources.put("slave", slaveDataSource);                DynamicDataSource dataSource = new DynamicDataSource();        dataSource.setTargetDataSources(targetDataSources);        dataSource.setDefaultTargetDataSource(masterDataSource);                return dataSource;    }}

在application.properties文件中配置数据源的相关属性：

# 主数据源配置spring.datasource.master.url = jdbc:mysql://localhost:3306/master_databasespring.datasource.master.username = rootspring.datasource.master.password = root# 从数据源配置spring.datasource.slave.url = jdbc:mysql://localhost:3306/slave_databasespring.datasource.slave.username = rootspring.datasource.slave.password = root

创建DynamicDataSource类，用于动态切换数据源：

public class DynamicDataSource extends AbstractRoutingDataSource {    @Override    protected Object determineCurrentLookupKey() {        return DataSourceContextHolder.getDataSource();    }}

创建DataSourceContextHolder类，用于保存当前线程使用的数据源：

public class DataSourceContextHolder {    private static final ThreadLocal<String> CONTEXT_HOLDER = new ThreadLocal<>();    public static void setDataSource(String dataSource) {        CONTEXT_HOLDER.set(dataSource);    }    public static String getDataSource() {        return CONTEXT_HOLDER.get();    }    public static void clearDataSource() {        CONTEXT_HOLDER.remove();    }}

创建AopDataSourceAspect类，用于切换数据源：

@Aspect@Componentpublic class AopDataSourceAspect {    @Before("@annotation(com.example.dynamicdatasource.annotation.DataSource)")    public void switchDataSource(JoinPoint point) {        MethodSignature signature = (MethodSignature) point.getSignature();        Method method = signature.getMethod();        DataSource dataSource = method.getAnnotation(DataSource.class);        if (dataSource == null) {            DataSourceContextHolder.setDataSource("master");        } else {            DataSourceContextHolder.setDataSource(dataSource.value());        }    }    @After("@annotation(com.example.dynamicdatasource.annotation.DataSource)")    public void restoreDataSource(JoinPoint point) {        DataSourceContextHolder.clearDataSource();    }}

在需要切换数据源的方法上添加@DataSource注解，如：

@DataSource("slave")public List<User> getUsers() {    // 查询从数据源}

通过以上配置，就可以在Spring Boot中实现动态数据源的切换。