public class DBContextHolder {    private static final ThreadLocal
    
      contextHolder = new ThreadLocal
     
      ();    public static void setDbType(String dbType) {        contextHolder.set(dbType);    }    public static String getDbType() {        return ((String) contextHolder.get());    }    public static void clearDbType() {        contextHolder.remove();    }}
     
    

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

//指定数据库DBContextHolder.setDbType("dataSource1");