这篇文章主要介绍了spring boot多数据源动态切换代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

当项目中存在多数据源时，就涉及到数据源的动态切换，通过研究，特此记录一下。

1、maven依赖

<!--数据库连接--><dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc6</artifactId> <version>11.2.0.4</version> <scope>runtime</scope> </dependency><!--数据库连接池-><dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency><!--aop-><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency>

2、多数据源信息配置

#多数据源测试spring: datasource: druid: master: driver-class-name: oracle.jdbc.driver.OracleDriver username: test password: test url: jdbc:oracle:thin:@//ip1:1521/orcl slave: driver-class-name: oracle.jdbc.driver.OracleDriver username: test password: test url: jdbc:oracle:thin:@//ip2:1521/orcl

3、数据源配置信息转换成实体类

@ConfigurationProperties(prefix = "spring.datasource.druid")@Data@Componentpublic class DataSourceProperties { private Map<String,String>master; private Map<String,String>slave;}

4、动态数据源切换类

public class DynamicDataSource extends AbstractRoutingDataSource { private static final ThreadLocal<String> contextHolder = new ThreadLocal<>(); public DynamicDataSource(DataSource defaultTargetDataSource, Map<Object, Object> targetDataSources) { super.setDefaultTargetDataSource(defaultTargetDataSource); super.setTargetDataSources(targetDataSources); super.afterPropertiesSet(); } @Override protected Object determineCurrentLookupKey() { return getDataSource(); } public static void setDataSource(String dataSource) { contextHolder.set(dataSource); } public static String getDataSource() { return contextHolder.get(); } public static void clearDataSource() { contextHolder.remove(); }}

5、多数据源配置类

@Configurationpublic class DynamicDataSourceConfig { @Bean public DataSource master(@Autowired DataSourceProperties dataSourceProperties){ DruidDataSource druidDataSource = new DruidDataSource(); Map<String, String> master = dataSourceProperties.getMaster(); druidDataSource.setUsername(master.get("username")); druidDataSource.setPassword(master.get("password")); druidDataSource.setUrl(master.get("url")); //其他参数配置 省略 return druidDataSource; } @Bean public DataSource slave(@Autowired DataSourceProperties dataSourceProperties){ DruidDataSource druidDataSource = new DruidDataSource(); Map<String, String> slave = dataSourceProperties.getSlave(); druidDataSource.setUsername(slave.get("username")); druidDataSource.setPassword(slave.get("password")); druidDataSource.setUrl(slave.get("url")); //其他参数配置 省略 return druidDataSource; } @Bean @Primary public DynamicDataSource dataSource(DataSource master,DataSource slave){ Map<Object,Object>map = new HashMap<>(4); map.put("master",master); map.put("slave",slave); return new DynamicDataSource(master,map); }}

6、自定义@DataSource注解

@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface DataSource { String name() default "master";}

7、Aop切面类配置

@Component@Aspectpublic class DataSourceAspect { @Pointcut("@annotation(com.zxgeo.sso.muiltDatasource.anons.DataSource)") public void dataSourcePointCut(){} @Around(value = "dataSourcePointCut()") public Object around(ProceedingJoinPoint point) throws Throwable { MethodSignature signature = (MethodSignature) point.getSignature(); Method method = signature.getMethod(); DataSource dataSource = method.getAnnotation(DataSource.class); if(dataSource == null){ DynamicDataSource.setDataSource("master"); }else { DynamicDataSource.setDataSource(dataSource.name()); } try { return point.proceed(); } finally { DynamicDataSource.clearDataSource(); } }}

8、启动配置注解信息，重要（不然运行会报错）

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})

9、测试

（1）、service层（此处没有使用mybatis）

@Servicepublic class TestService { @Autowired private javax.sql.DataSource dataSource; @DataSource public Map<String,Object> getMasterDataSource() throws SQLException { Connection connection = dataSource.getConnection(); Map<String,Object> map; try (PreparedStatement preparedStatement = connection.prepareStatement("SELECT * FROM AA WHERE A=10001")) { ResultSet resultSet = preparedStatement.executeQuery(); map = new HashMap<>(); while (resultSet.next()){ map.put("A",resultSet.getString("A")); map.put("B",resultSet.getString("B")); map.put("C",resultSet.getString("C")); } } return map; } @DataSource(name = "slave") public Map<String,Object> getSlaveDataSource() throws SQLException { Connection connection = dataSource.getConnection(); Map<String,Object> map; try (PreparedStatement preparedStatement = connection.prepareStatement("SELECT * FROM AA WHERE A=10002")) { ResultSet resultSet = preparedStatement.executeQuery(); map = new HashMap<>(); while (resultSet.next()){ map.put("A",resultSet.getString("A")); map.put("B",resultSet.getString("B")); map.put("C",resultSet.getString("C")); } } return map; }}

（2）、单元测试

@SpringBootTest@RunWith(SpringRunner.class)class SsoApplicationTests { @Autowired private TestService testService; @Test public void muliDatasorce() throws SQLException { Map<String, Object> masterDataSourceUrl = testService.getMasterDataSource(); System.out.println(masterDataSourceUrl); Map<String, Object> slaveDataSourceUrl = testService.getSlaveDataSource(); System.out.println(slaveDataSourceUrl); }}

（3）、结果：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。