Data exchange method

The invention provides a data exchange method which comprises the following steps: a task creation step: a data sender creates a data sending task and sets state information as a first state; a task initialization step: the data sender collects a data sending task of which the state information is a first state, checks the timeliness of the corresponding data sending task, and modifies the state information of the data sending task passing the check into a second state; a data packaging step: the data sender collects a data sending task of which the state information is a second state, storesthe to-be-sent data associated with the data sending task in a second storage unit, and modifies the state information into a third state; and a data sending step: the data sender collects a data sending task of which the state information is a third state, sends the corresponding to-be-sent data to the data receiver, and modifies the state information into a fourth state after receiving feedbackof successful receiving. T