贴个Statement.cancel()的文档：

/**
     Cancels this <code>Statement</code> object if both the DBMS and
     driver support aborting an SQL statement.
     This method can be used by one thread to cancel a statement that
     is being executed by another thread.
    
     @exception SQLException if a database access error occurs or
     this method is called on a closed <code>Statement</code>
     @exception SQLFeatureNotSupportedException if the JDBC driver does not support
     this method
   */
     
    void cancel() throws SQLException;
    

根据javadoc的描述，如果DBMS和驱动都支持的话是可以使用这个api结束
可以先设置超时时间：

    void setQueryTimeout(int seconds) throws SQLException;
    

捕获这个异常然后cancel()

mysql超时设置吧