参考：https://yq.aliyun.com/articles/632079
首先看配置文件：
#spring配置
spring:
#主数据源
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://server:3306/simon_jia_dev?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true&useSSL=false
username: root
password: js=123456
type: com.zaxxer.hikari.HikariDataSource
hikari:
maxLifetime: 1765000 #一个连接的生命时长（毫秒），超时而且没被使用则被释放（retired），缺省:30分钟，建议设置比数据库超时时长少30秒以上
maximumPoolSize: 20 #连接池中允许的最大连接数。缺省值：10；推荐的公式：((core_count * 2) + effective_spindle_count)
minimumIdle: 1 #连接池中允许的最小空闲连接数
# 更多数据源
custom:
datasource:
names: ds1,ds2
ds1:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://server:3306/simon_jia_dev?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true&useSSL=false
username: root
password: 123456
type: com.zaxxer.hikari.HikariDataSource
hikari:
maxLifetime: 1765000 #一个连接的生命时长（毫秒），超时而且没被使用则被释放（retired），缺省:30分钟，建议设置比数据库超时时长少30秒以上
maximumPoolSize: 20 #连接池中允许的最大连接数。缺省值：10；推荐的公式：((core_count * 2) + effective_spindle_count)
minimumIdle: 1 #连接池中允许的最小空闲连接数\
ds2:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true&useSSL=false
username: root
password: 123456
type: com.zaxxer.hikari.HikariDataSource
hikari:
maxLifetime: 1765000 #一个连接的生命时长（毫秒），超时而且没被使用则被释放（retired），缺省:30分钟，建议设置比数据库超时时长少30秒以上
maximumPoolSize: 20 #连接池中允许的最大连接数。缺省值：10；推荐的公式：((core_count * 2) + effective_spindle_count)
minimumIdle: 1 #连接池中允许的最小空闲连接数
注解类
package com.simonjia.common.datasource;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* @Author: SimonHu
* @Date: 2019/11/21 13:41
* @Description:在方法上使用，用于指定使用哪个数据源
*/
@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface TargetDataSource {
String name();
}
动态数据源
package com.simonjia.common.datasource;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
/**
* @Author: SimonHu
* @Date: 2019/11/21 13:37
* @Description:动态数据源
*/
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
return DynamicDataSourceContextHolder.getDataSourceType();
}
}
数据源切面
package com.simonjia.common.datasource;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* @Author: SimonHu
* @Date: 2019/11/21 13:38
* @Description:
*/
@Aspect
@Order(-1)// 保证该AOP在@Transactional之前执行
@Component
public class DynamicDataSourceAspect {
private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceAspect.class);
@Before("@annotation(ds)")
public void changeDataSource(JoinPoint point, TargetDataSource ds) throws Throwable {
String dsId = ds.name();
if (!DynamicDataSourceContextHolder.containsDataSource(dsId)) {
logger.error("数据源[{}]不存在，使用默认数据源 > {}", ds.name(), point.getSignature());
} else {
logger.debug("Use DataSource : {} > {}", ds.name(), point.getSignature());
DynamicDataSourceContextHolder.setDataSourceType(ds.name());
}
}
@After("@annotation(ds)")
public void restoreDataSource(JoinPoint point, TargetDataSource ds) {
logger.debug("Revert DataSource : {} > {}", ds.name(), point.getSignature());
DynamicDataSourceContextHolder.clearDataSourceType();
}
}
package com.simonjia.common.datasource;
import java.util.ArrayList;
import java.util.List;
/**
* @Author: SimonHu
* @Date: 2019/11/21 13:39
* @Description:
*/
public class DynamicDataSourceContextHolder {
private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();
public static List<String> dataSourceIds = new ArrayList<>();
public static void setDataSourceType(String dataSourceType) {
contextHolder.set(dataSourceType);
}
public static String getDataSourceType() {
return contextHolder.get();
}
public static void clearDataSourceType() {
contextHolder.remove();
}
/**
* 判断指定DataSrouce当前是否存在
*
* @param dataSourceId
* @return
* @author SHANHY
* @create 2016年1月24日
*/
public static boolean containsDataSource(String dataSourceId) {
return dataSourceIds.contains(dataSourceId);
}
}
动态数据源注册
package com.simonjia.common.datasource;
import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.PropertyValues;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.bind.RelaxedDataBinder;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotationMetadata;
/**
* @Author: SimonHu
* @Date: 2019/11/21 13:39
* @Description:动态数据源注册<br/>
* * 启动动态数据源请在启动类中（如SpringBootSampleApplication）
* * 添加 @Import(DynamicDataSourceRegister.class)
*/
public class DynamicDataSourceRegister implements ImportBeanDefinitionRegistrar, EnvironmentAware{
private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceRegister.class);
private ConversionService conversionService = new DefaultConversionService();
private PropertyValues dataSourcePropertyValues;
// 如配置文件中未指定数据源类型，使用该默认值
private static final Object DATASOURCE_TYPE_DEFAULT = "org.apache.tomcat.jdbc.pool.DataSource";
// private static final Object DATASOURCE_TYPE_DEFAULT =
// "com.zaxxer.hikari.HikariDataSource";
// 数据源
private DataSource defaultDataSource;
private Map<String, DataSource> customDataSources = new HashMap<>();
@Override
public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
Map<Object, Object> targetDataSources = new HashMap<Object, Object>();
// 将主数据源添加到更多数据源中
targetDataSources.put("dataSource", defaultDataSource);
DynamicDataSourceContextHolder.dataSourceIds.add("dataSource");
// 添加更多数据源
targetDataSources.putAll(customDataSources);
for (String key : customDataSources.keySet()) {
DynamicDataSourceContextHolder.dataSourceIds.add(key);
}
// 创建DynamicDataSource
GenericBeanDefinition beanDefinition = new GenericBeanDefinition();
beanDefinition.setBeanClass(DynamicDataSource.class);
beanDefinition.setSynthetic(true);
MutablePropertyValues mpv = beanDefinition.getPropertyValues();
mpv.addPropertyValue("defaultTargetDataSource", defaultDataSource);
mpv.addPropertyValue("targetDataSources", targetDataSources);
registry.registerBeanDefinition("dataSource", beanDefinition);
logger.info("Dynamic DataSource Registry");
}
/**
* 创建DataSource
*
* @param type
* @param driverClassName
* @param url
* @param username
* @param password
* @return
* @author SHANHY
* @create 2016年1月24日
*/
@SuppressWarnings("unchecked")
public DataSource buildDataSource(Map<String, Object> dsMap) {
try {
Object type = dsMap.get("type");
if (type == null) {
// 默认DataSource
type = DATASOURCE_TYPE_DEFAULT;
}
Class<? extends DataSource> dataSourceType;
dataSourceType = (Class<? extends DataSource>) Class.forName((String) type);
String driverClassName = dsMap.get("driver-class-name").toString();
String url = dsMap.get("url").toString();
String username = dsMap.get("username").toString();
String password = dsMap.get("password").toString();
DataSourceBuilder factory = DataSourceBuilder.create().driverClassName(driverClassName).url(url)
.username(username).password(password).type(dataSourceType);
return factory.build();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return null;
}
/**
* 加载多数据源配置
*/
@Override
public void setEnvironment(Environment env) {
initDefaultDataSource(env);
initCustomDataSources(env);
}
/**
* 初始化主数据源
*
* @author SHANHY
* @create 2016年1月24日
*/
private void initDefaultDataSource(Environment env) {
// 读取主数据源
RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(env, "spring.datasource.");
Map<String, Object> dsMap = new HashMap<>();
dsMap.put("type", propertyResolver.getProperty("type"));
dsMap.put("driver-class-name", propertyResolver.getProperty("driver-class-name"));
dsMap.put("url", propertyResolver.getProperty("url"));
dsMap.put("username", propertyResolver.getProperty("username"));
dsMap.put("password", propertyResolver.getProperty("password"));
defaultDataSource = buildDataSource(dsMap);
dataBinder(defaultDataSource, env);
}
/**
* 为DataSource绑定更多数据
*
* @param dataSource
* @param env
* @author SHANHY
* @create 2016年1月25日
*/
private void dataBinder(DataSource dataSource, Environment env){
RelaxedDataBinder dataBinder = new RelaxedDataBinder(dataSource);
//dataBinder.setValidator(new LocalValidatorFactory().run(this.applicationContext));
dataBinder.setConversionService(conversionService);
dataBinder.setIgnoreNestedProperties(false);//false
dataBinder.setIgnoreInvalidFields(false);//false
dataBinder.setIgnoreUnknownFields(true);//true
if(dataSourcePropertyValues == null){
Map<String, Object> rpr = new RelaxedPropertyResolver(env, "spring.datasource").getSubProperties(".");
Map<String, Object> values = new HashMap<>(rpr);
// 排除已经设置的属性
values.remove("type");
values.remove("driver-class-name");
values.remove("url");
values.remove("username");
values.remove("password");
dataSourcePropertyValues = new MutablePropertyValues(values);
}
dataBinder.bind(dataSourcePropertyValues);
}
/**
* 初始化更多数据源
*
* @author SHANHY
* @create 2016年1月24日
*/
private void initCustomDataSources(Environment env) {
// 读取配置文件获取更多数据源，也可以通过defaultDataSource读取数据库获取更多数据源
RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(env, "custom.datasource.");
String dsPrefixs = propertyResolver.getProperty("names");
for (String dsPrefix : dsPrefixs.split(",")) {// 多个数据源
Map<String, Object> dsMap = propertyResolver.getSubProperties(dsPrefix + ".");
DataSource ds = buildDataSource(dsMap);
customDataSources.put(dsPrefix, ds);
dataBinder(ds, env);
}
}
}
启动类加上
@SpringBootApplication
@Import({DynamicDataSourceRegister.class}) // 注册动态多数据源
public class JiaApplication extends WebMvcConfigurerAdapter {
public static void main(String[] args) {
SpringApplication.run(JiaApplication.class, args);
}
}
@TargetDataSource注解要使用在service层
@TargetDataSource(name="ds2")
public List<Map> testDataSource(){
List<Map> list = indexMapper.selectStudent();
return list;
}
调用其他数据库成功
