SpringBoot如何在运行时动态添加数据源

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;
  }
}

    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);
  }
}