Abstract: In a file download method executed by a computing device, a download address for each file is generated. The addressed file is stored in a storage system connected to the computing device. In response to a download start request, an addressed file is retrieved from the storage system and transformed into a data stream. Data blocks with a specific length are read from the data stream and transmitted to the client computer. In response to a download suspend request, an offset address is recorded, and transmission of the data blocks is suspended. In response to a download resume request, data blocks of the data stream are read from the offset address and transmission of the data blocks to the client computer is resumed. In response to a download stop request, the transmission of any data block to the client computer is stopped.

Abstract: When a server receives a request for accessing a first business system from a client and a first request data packet sent from another business system, the server determines that an access mode of the client is single-point login access. Then the server validates if the client has authority to access the first business system according to data in the first request data packet and data in an information list, and allows the client to access the first business system if the client has the authority, or rejects the client to access the first business system if the client does not have the authority. When receiving a request of switching the client from the first business system to a second business system, the server sends a second request data packet to the second business system.

Abstract: In a method for loading web pages, a time interval of how often data is retrieved from a database is set. When a user accesses a web page from a web server, one screen of data of the web page is retrieved from the database and displayed on a display device. Then one screen of remaining data of the web page is retrieved from the database every time interval until all of the remaining data has been retrieved, and all of the retrieved data is stored in a file. A next screen of data of the web page is loaded from the file and displayed on the display device until all of the data in the file has been loaded, in response that a vertical scroll bar displayed on the web page reaches a preset position.