SpringBoot（十一）-- 动态数据源

package com.xsjt.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;
/**
* ClassName:DynamicDataSourceRegister
* Date: 2017年11月13日 下午7:40:42
* @author Joe
* @version
* @since JDK 1.8
*/
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<String, DataSource>(); 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); // 注册到Spring容器中 logger.info("Dynamic DataSource Registry");
} /**
* 创建DataSource
* @param type
* @param driverClassName
* @param url
* @param username
* @param password
* @return
*/
@SuppressWarnings("unchecked")
public DataSource buildDataSource(Map<String, Object> dsMap) {
try {
Object type = dsMap.get("type");
if (type == null)
type = DATASOURCE_TYPE_DEFAULT;// 默认DataSource 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
*/
private void initDefaultDataSource(Environment env) {
// 读取主数据源
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
*/
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<String, Object>(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
*
*/
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);
}
}
}

package com.xsjt.dynamicDataSource;
import java.util.ArrayList;
import java.util.List;
/**
* ClassName:DynamicDataSourceContextHolder
* Date: 2017年11月13日 下午7:41:49
* @author Joe
* @version
* @since JDK 1.8
*/
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
*/
public static boolean containsDataSource(String dataSourceId){
return dataSourceIds.contains(dataSourceId);
}
}

/**
* ClassName:TargetDataSource
* Date: 2017年11月13日 下午7:42:15
* @author Joe
* @version
* @since JDK 1.8
*/
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface TargetDataSource {
String name();
}

package com.xsjt.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;
/**
* ClassName:DynamicDataSourceAspect
* Date: 2017年11月13日 下午7:44:09
* @author Joe
* @version
* @since JDK 1.8
*/
@Aspect
//保证该AOP在@Transactional之前执行
@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();
}
}

package com.xsjt.dynamicDataSource;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
/**
* ClassName:DynamicDataSource
* 继承Spring AbstractRoutingDataSource实现路由切换
* Date: 2017年11月13日 下午7:49:49
* @author Joe
* @version
* @since JDK 1.8
*/
public class DynamicDataSource extends AbstractRoutingDataSource { @Override
protected Object determineCurrentLookupKey() {
return DynamicDataSourceContextHolder.getDataSourceType();
}
}