其实现在的项目或者中间件中，多数据源已经封装的很好了。比如mybatis-plus就封装好了多数据源，@DS("*")就可以实现对数据源的注入，具体可以参考： Mybatis-Plus多数据源,但是在历史的项目中确实也有用到多数据源，分享给大家，也作为自己职业生涯的经验记录。
1.自定义DataSource注解
/**
* 多数据源注解
*/
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface DataSource {
String value() default "";
}
2.定义注解的切面DataSourceAspect
package com.bdysoft.datasource.aspect;
import com.bdysoft.datasource.annotation.DataSource;
import com.bdysoft.datasource.config.DynamicContextHolder;
import com.bdysoft.datasource.annotation.DataSource;
import com.bdysoft.datasource.config.DynamicContextHolder;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
/**
* 多数据源，切面处理类
*/
@Aspect
@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class DataSourceAspect {
protected Logger logger = LoggerFactory.getLogger(getClass());
@Pointcut("@annotation(com.bdysoft.datasource.annotation.DataSource) " +
"|| @within(com.bdysoft.datasource.annotation.DataSource)")
public void dataSourcePointCut() {
}
@Around("dataSourcePointCut()")
public Object around(ProceedingJoinPoint point) throws Throwable {
MethodSignature signature = (MethodSignature) point.getSignature();
Class targetClass = point.getTarget().getClass();
Method method = signature.getMethod();
DataSource targetDataSource = (DataSource)targetClass.getAnnotation(DataSource.class);
DataSource methodDataSource = method.getAnnotation(DataSource.class);
if(targetDataSource != null || methodDataSource != null){
String value;
if(methodDataSource != null){
value = methodDataSource.value();
}else {
value = targetDataSource.value();
}
DynamicContextHolder.push(value);
logger.debug("set datasource is {}", value);
}
try {
return point.proceed();
} finally {
DynamicContextHolder.poll();
logger.debug("clean datasource");
}
}
}
3.自定义多数据源上下文DynamicContextHolder
package com.bdysoft.datasource.config;
import java.util.ArrayDeque;
import java.util.Deque;
/**
* 多数据源上下文
*/
public class DynamicContextHolder {
@SuppressWarnings("unchecked")
private static final ThreadLocal<Deque<String>> CONTEXT_HOLDER = new ThreadLocal() {
@Override
protected Object initialValue() {
return new ArrayDeque();
}
};
/**
* 获得当前线程数据源
*
* @return 数据源名称
*/
public static String peek() {
return CONTEXT_HOLDER.get().peek();
}
/**
* 设置当前线程数据源
*
* @param dataSource 数据源名称
*/
public static void push(String dataSource) {
CONTEXT_HOLDER.get().push(dataSource);
}
/**
* 清空当前线程数据源
*/
public static void poll() {
Deque<String> deque = CONTEXT_HOLDER.get();
deque.poll();
if (deque.isEmpty()) {
CONTEXT_HOLDER.remove();
}
}
}
4.多数据源DynamicDataSource继承AbstractRoutingDataSource
package com.bdysoft.datasource.config;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
/**
* 多数据源
*/
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
return DynamicContextHolder.peek();
}
}
5.配置多数据源DynamicDataSourceConfig
package com.bdysoft.datasource.config;
import com.alibaba.druid.pool.DruidDataSource;
import com.bdysoft.datasource.properties.DataSourceProperties;
import com.bdysoft.datasource.properties.DynamicDataSourceProperties;
import com.bdysoft.datasource.properties.DataSourceProperties;
import com.bdysoft.datasource.properties.DynamicDataSourceProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.HashMap;
import java.util.Map;
/**
* 配置多数据源
*/
@Configuration
@EnableConfigurationProperties(DynamicDataSourceProperties.class)
public class DynamicDataSourceConfig {
@Autowired
private DynamicDataSourceProperties properties;
@Bean
@ConfigurationProperties(prefix = "spring.datasource.druid")
public DataSourceProperties dataSourceProperties() {
return new DataSourceProperties();
}
@Bean
public DynamicDataSource dynamicDataSource(DataSourceProperties dataSourceProperties) {
DynamicDataSource dynamicDataSource = new DynamicDataSource();
dynamicDataSource.setTargetDataSources(getDynamicDataSource());
//默认数据源
DruidDataSource defaultDataSource = DynamicDataSourceFactory.buildDruidDataSource(dataSourceProperties);
dynamicDataSource.setDefaultTargetDataSource(defaultDataSource);
return dynamicDataSource;
}
private Map<Object, Object> getDynamicDataSource(){
Map<String, DataSourceProperties> dataSourcePropertiesMap = properties.getDatasource();
Map<Object, Object> targetDataSources = new HashMap<>(dataSourcePropertiesMap.size());
dataSourcePropertiesMap.forEach((k, v) -> {
DruidDataSource druidDataSource = DynamicDataSourceFactory.buildDruidDataSource(v);
targetDataSources.put(k, druidDataSource);
});
return targetDataSources;
}
}
6.编写DynamicDataSourceFactory
package com.bdysoft.datasource.config;
import com.alibaba.druid.pool.DruidDataSource;
import com.bdysoft.datasource.properties.DataSourceProperties;
import com.bdysoft.datasource.properties.DataSourceProperties;
import java.sql.SQLException;
/**
* DruidDataSource
*/
public class DynamicDataSourceFactory {
public static DruidDataSource buildDruidDataSource(DataSourceProperties properties) {
DruidDataSource druidDataSource = new DruidDataSource();
druidDataSource.setDriverClassName(properties.getDriverClassName());
druidDataSource.setUrl(properties.getUrl());
druidDataSource.setUsername(properties.getUsername());
druidDataSource.setPassword(properties.getPassword());
druidDataSource.setInitialSize(properties.getInitialSize());
druidDataSource.setMaxActive(properties.getMaxActive());
druidDataSource.setMinIdle(properties.getMinIdle());
druidDataSource.setMaxWait(properties.getMaxWait());
druidDataSource.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRunsMillis());
druidDataSource.setMinEvictableIdleTimeMillis(properties.getMinEvictableIdleTimeMillis());
druidDataSource.setMaxEvictableIdleTimeMillis(properties.getMaxEvictableIdleTimeMillis());
druidDataSource.setValidationQuery(properties.getValidationQuery());
druidDataSource.setValidationQueryTimeout(properties.getValidationQueryTimeout());
druidDataSource.setTestOnBorrow(properties.isTestOnBorrow());
druidDataSource.setTestOnReturn(properties.isTestOnReturn());
druidDataSource.setPoolPreparedStatements(properties.isPoolPreparedStatements());
druidDataSource.setMaxOpenPreparedStatements(properties.getMaxOpenPreparedStatements());
druidDataSource.setSharePreparedStatements(properties.isSharePreparedStatements());
try {
druidDataSource.setFilters(properties.getFilters());
druidDataSource.init();
} catch (SQLException e) {
e.printStackTrace();
}
return druidDataSource;
}
}
7.编写DataSourceProperties
package com.bdysoft.datasource.properties;
/**
* 多数据源属性
*/
public class DataSourceProperties {
private String driverClassName;
private String url;
private String username;
private String password;
/**
* Druid默认参数
*/
private int initialSize = 2;
private int maxActive = 10;
private int minIdle = -1;
private long maxWait = 60 * 1000L;
private long timeBetweenEvictionRunsMillis = 60 * 1000L;
private long minEvictableIdleTimeMillis = 1000L * 60L * 30L;
private long maxEvictableIdleTimeMillis = 1000L * 60L * 60L * 7;
private String validationQuery = "select 1";
private int validationQueryTimeout = -1;
private boolean testOnBorrow = false;
private boolean testOnReturn = false;
private boolean testWhileIdle = true;
private boolean poolPreparedStatements = false;
private int maxOpenPreparedStatements = -1;
private boolean sharePreparedStatements = false;
private String filters = "stat,wall";
public String getDriverClassName() {
return driverClassName;
}
public void setDriverClassName(String driverClassName) {
this.driverClassName = driverClassName;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getInitialSize() {
return initialSize;
}
public void setInitialSize(int initialSize) {
this.initialSize = initialSize;
}
public int getMaxActive() {
return maxActive;
}
public void setMaxActive(int maxActive) {
this.maxActive = maxActive;
}
public int getMinIdle() {
return minIdle;
}
public void setMinIdle(int minIdle) {
this.minIdle = minIdle;
}
public long getMaxWait() {
return maxWait;
}
public void setMaxWait(long maxWait) {
this.maxWait = maxWait;
}
public long getTimeBetweenEvictionRunsMillis() {
return timeBetweenEvictionRunsMillis;
}
public void setTimeBetweenEvictionRunsMillis(long timeBetweenEvictionRunsMillis) {
this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
}
public long getMinEvictableIdleTimeMillis() {
return minEvictableIdleTimeMillis;
}
public void setMinEvictableIdleTimeMillis(long minEvictableIdleTimeMillis) {
this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
}
public long getMaxEvictableIdleTimeMillis() {
return maxEvictableIdleTimeMillis;
}
public void setMaxEvictableIdleTimeMillis(long maxEvictableIdleTimeMillis) {
this.maxEvictableIdleTimeMillis = maxEvictableIdleTimeMillis;
}
public String getValidationQuery() {
return validationQuery;
}
public void setValidationQuery(String validationQuery) {
this.validationQuery = validationQuery;
}
public int getValidationQueryTimeout() {
return validationQueryTimeout;
}
public void setValidationQueryTimeout(int validationQueryTimeout) {
this.validationQueryTimeout = validationQueryTimeout;
}
public boolean isTestOnBorrow() {
return testOnBorrow;
}
public void setTestOnBorrow(boolean testOnBorrow) {
this.testOnBorrow = testOnBorrow;
}
public boolean isTestOnReturn() {
return testOnReturn;
}
public void setTestOnReturn(boolean testOnReturn) {
this.testOnReturn = testOnReturn;
}
public boolean isTestWhileIdle() {
return testWhileIdle;
}
public void setTestWhileIdle(boolean testWhileIdle) {
this.testWhileIdle = testWhileIdle;
}
public boolean isPoolPreparedStatements() {
return poolPreparedStatements;
}
public void setPoolPreparedStatements(boolean poolPreparedStatements) {
this.poolPreparedStatements = poolPreparedStatements;
}
public int getMaxOpenPreparedStatements() {
return maxOpenPreparedStatements;
}
public void setMaxOpenPreparedStatements(int maxOpenPreparedStatements) {
this.maxOpenPreparedStatements = maxOpenPreparedStatements;
}
public boolean isSharePreparedStatements() {
return sharePreparedStatements;
}
public void setSharePreparedStatements(boolean sharePreparedStatements) {
this.sharePreparedStatements = sharePreparedStatements;
}
public String getFilters() {
return filters;
}
public void setFilters(String filters) {
this.filters = filters;
}
}
8.编写DynamicDataSourceProperties
package com.bdysoft.datasource.properties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* 多数据源属性
*/
@ConfigurationProperties(prefix = "dynamic")
public class DynamicDataSourceProperties {
private Map<String, DataSourceProperties> datasource = new LinkedHashMap<>();
public Map<String, DataSourceProperties> getDatasource() {
return datasource;
}
public void setDatasource(Map<String, DataSourceProperties> datasource) {
this.datasource = datasource;
}
}
9.yam文件配置多数据源
##多数据源的配置
dynamic:
datasource:
local:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/admin?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
username: root
password: root
user:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
username: root
password: root
10.代码中使用多数据源
@DataSource("local")
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