Spring实现多数据源

核心： AbstractRoutingDataSource

定义一个类继承AbstractRoutingDataSource

public class DynamicDataSource extends AbstractRoutingDataSource {
    
    @Override
    protected Object determineCurrentLookupKey() {
        return DataSourceHolder.get();
    }
}

配置的时候注入：

public void setTargetDataSources(Map<Object, Object> targetDataSources) {
        this.targetDataSources = targetDataSources;
    }

并且重写：

@Nullable
protected abstract Object determineCurrentLookupKey();

这个key就是真正和实际DataSource的映射key：
当然还有个默认的dataSource: resolvedDefaultDataSource

this.targetDataSources.forEach((key, value) -> {
            Object lookupKey = resolveSpecifiedLookupKey(key);
            DataSource dataSource = resolveSpecifiedDataSource(value);
            this.resolvedDataSources.put(lookupKey, dataSource);
        });
        if (this.defaultTargetDataSource != null) {
            this.resolvedDefaultDataSource = resolveSpecifiedDataSource(this.defaultTargetDataSource);
        }

其实很简单，就这么多。