Rich text format realization system and method based on expanded XMPP (xml based messaging and presence protocol)

The invention provides a rich text format realization system and a rich text format realization method based on an expanded XMPP (xml based messaging and presence protocol). The system comprises a client and a server end, wherein the client comprises an encoding and decoding module, a text receiving and sending module and an image receiving and sending module, the encoding and decoding module is used for encoding and decoding instant messages, the text receiving and sending module is used for sending and receiving the text messages, the picture receiving and sending module is used for sending and receiving image information, the server end comprises a message receiving and sending processing module, an off-line message module and an image management module, the message receiving and sending processing module is used for receiving and transferring instant messages from the client, the off-line message module is used for temporarily storing the text messages, and the picture management module is used for storing and managing the picture information. The system and the method provided by the invention have the advantages that expansibility and intercommunity are good, the separated picture and text sending is realized, the message passage blockage caused by over size pictures is prevented, the base64 coding is adopted for sending the pictures in the instant messages, and the efficiency is relatively higher.