版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/w1lgy/article/details/80179689
一、Springboot 动态数据源
把文章下半部分的代码复制到项目包中，然后按下面步骤处理就能实现多数据源的切换。
1、启动类注册动态数据源
@SpringBootApplication @Import({DynamicDataSourceRegister.class}) public class SpringBootSampleApplication {}
2、配置文件application.properties
#JDBC配置
#默认数据源
#spring.datasource.type=com.alibaba.druid.pool.DruidDataSource type可以修改连接池，默认采用Tomcat的连接池
spring.datasource.url=jdbc:mysql://localhost:3306/consult
spring.datasource.username=myConsult
spring.datasource.password=123456
spring.datasource.driver-class-name=org.gjt.mm.mysql.Driver
# 更多数据源
custom.datasource.names=ds1,ds2
custom.datasource.ds1.driver-class-name=com.mysql.jdbc.Driver
custom.datasource.ds1.url=jdbc:mysql://localhost:3306/test1
custom.datasource.ds1.username=root
custom.datasource.ds1.password=123456
custom.datasource.ds2.driver-class-name=com.mysql.jdbc.Driver
custom.datasource.ds2.url=jdbc:mysql://localhost:3306/test2
custom.datasource.ds2.username=root
custom.datasource.ds2.password=123456
3、配置文件中加上配置
mybatis.typeAliasesPackage=com.dongnao.jack.bean
mybatis.mapperLocations=classpath:com/dongnao/jack/xml
补充：mybatis引入后mapper的映射接口不用添加注解，其他用法一样。
4、动态切换数据源
使用时用@TargetDataSource(name = “ds1”)指明数据源即可。
@TargetDataSource(name = "ds1")
public User findUserByName(String username) {
List<User> users = userMapper.findByUserName(username);
return users.size() > 0 ? users.get(0) : null;
}
@Transactional
@TargetDataSource(name = "ds2")
public int saveArea(ConsultConfigArea area) {
int cout = mapper.saveArea(area);
return cout;
}
下面贴上完整的处理代码：
1、DynamicDataSourceRegister
package com.dongnao.jack.dynamicDataSource;
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;
public class DynamicDataSourceRegister implements
ImportBeanDefinitionRegistrar, EnvironmentAware {
private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceRegister.class);
private ConversionService conversionService = new DefaultConversionService();
private PropertyValues dataSourcePropertyValues;
private static final Object DATASOURCE_TYPE_DEFAULT = "org.apache.tomcat.jdbc.pool.DataSource";
private DataSource defaultDataSource;
private Map<String, DataSource> customDataSources = new HashMap<String, DataSource>();
public void registerBeanDefinitions(
AnnotationMetadata importingClassMetadata,
BeanDefinitionRegistry registry) {
Map<Object, Object> targetDataSources = new HashMap<Object, Object>();
targetDataSources.put("dataSource", defaultDataSource);
DynamicDataSourceContextHolder.dataSourceIds.add("dataSource");
targetDataSources.putAll(customDataSources);
for (String key : customDataSources.keySet()) {
DynamicDataSourceContextHolder.dataSourceIds.add(key);
}
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)
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
*/
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) {
RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(
env, "spring.datasource.");
Map<String, Object> dsMap = new HashMap<String, Object>();
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.setConversionService(conversionService);
dataBinder.setIgnoreNestedProperties(false);
dataBinder.setIgnoreInvalidFields(false);
dataBinder.setIgnoreUnknownFields(true);
if (dataSourcePropertyValues == null) {
Map<String, Object> rpr = new RelaxedPropertyResolver(env,
"spring.datasource").getSubProperties(".");
Map<String, Object> values = new HashMap<String, Object>(rpr);
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) {
RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(
env, "custom.datasource.");
String dsPrefixs = propertyResolver.getProperty("names");
for (String dsPrefix : dsPrefixs.split(",")) {
Map<String, Object> dsMap = propertyResolver.getSubProperties(dsPrefix
+ ".");
DataSource ds = buildDataSource(dsMap);
customDataSources.put(dsPrefix, ds);
dataBinder(ds, env);
}
}
}
2、TargetDataSource
package com.dongnao.jack.dynamicDataSource
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
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface TargetDataSource {
String name()
}
3、DynamicDataSource
package com.dongnao.jack.dynamicDataSource;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
return DynamicDataSourceContextHolder.getDataSourceType();
}
}
4、DynamicDataSourceAspect
package com.dongnao.jack.dynamicDataSource;
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;
@Aspect
@Order(-1)
@Component
public class DynamicDataSourceAspect {
private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceAspect.class);
/**
* @Description 在方法执行之前执行 @annotation(ds) 会拦截有ds这个注解的方法即有 TargetDataSource这个注解的
* @param @param point
* @param @param ds
* @param @throws Throwable 参数
* @return void 返回类型
* @throws
*/
@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());
}
}
/**
* @Description 在方法执行之后执行 @annotation(ds) 会拦截有ds这个注解的方法即有 TargetDataSource这个注解的
* @param @param point
* @param @param ds 参数
* @return void 返回类型
* @throws
*/
@After("@annotation(ds)")
public void restoreDataSource(JoinPoint point, TargetDataSource ds) {
logger.debug("Revert DataSource : {} > {}",
ds.name(),
point.getSignature());
DynamicDataSourceContextHolder.clearDataSourceType();
}
}
5、DynamicDataSourceContextHolder
package com.dongnao.jack.dynamicDataSource;
import java.util.ArrayList;
import java.util.List;
public class DynamicDataSourceContextHolder {
private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();
public static List<String> dataSourceIds = new ArrayList<String>();
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);
}
}
