1.配置文件配置多数据源,如默认数据源:master,数据源1:salve1...,运行时动态切换已配置的数据源(master、salve1互相切换),无法在运行时动态添加配置文件中未配置的数据源。
Spring提供了AbstractRoutingDataSource用于动态路由数据源,第一种场景继承AbstractRoutingDataSource类并覆写其protected abstract Object determineCurrentLookupKey()即可;
而第二种场景我们直接覆写protected DataSource determineTargetDataSource方法即可。原理可看下AbstractRoutingDataSource对应源码,比较简单,不做赘述。
直接上干货:
import com.fizz.utils.spring.SpringUtils; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; import javax.sql.DataSource; public class DynamicDataSource extends AbstractRoutingDataSource { private static final ThreadLocal<DataSource> dataSource = ThreadLocal.withInitial(() -> (DataSource) SpringUtils.getBean("defaultDataSource")); public static void setDataSource(DataSource dataSource) { DynamicDataSource.dataSource.set(dataSource); } public static DataSource getDataSource() { return DynamicDataSource.dataSource.get(); } @Override protected Object determineCurrentLookupKey() { return null; } @Override protected DataSource determineTargetDataSource() { return getDataSource(); } public static void clear() { DynamicDataSource.dataSource.remove(); } }
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import javax.sql.DataSource; import java.util.HashMap; @Configuration public class DataSourceConfig { @Bean @ConfigurationProperties("spring.datasource.druid") public DataSource defaultDataSource() { return DruidDataSourceBuilder.create().build(); } @Bean @Primary public DynamicDataSource dataSource() { DynamicDataSource dynamicDataSource = new DynamicDataSource(); dynamicDataSource.setTargetDataSources(new HashMap<>()); return dynamicDataSource; } }
使用时直接调用DynamicDataSource.setDataSource(DataSource dataSource)方法即可,使用完后调用DynamicDataSource.clear()防止内存泄漏并重置默认数据源。
DruidDataSource druidDataSource = new DruidDataSource(); druidDataSource.setUrl("jdbc:mysql://localhost:3306/sys?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC&useAffectedRows=true"); druidDataSource.setUsername("root"); druidDataSource.setPassword("root"); DynamicDataSource.setDataSource(druidDataSource); 此时数据源已切换到druidDataSource ,调用自己的业务方法即可。 使用完后调用DynamicDataSource.clear();重置为默认数据源。
import lombok.Getter; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; @Component public final class SpringUtils implements ApplicationContextAware { @Getter private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { if (SpringUtils.applicationContext == null) { SpringUtils.applicationContext = applicationContext; } } public static <T> T getBean(Class<T> clazz) { return SpringUtils.applicationContext.getBean(clazz); } public static Object getBean(String name) { return SpringUtils.applicationContext.getBean(name); } public static String getProperty(String key) { return SpringUtils.applicationContext.getEnvironment().getProperty(key); } }