11. The method according to claim 10 , further comprising: parsing a security ID of the current user from the transformed input parameters recognizable by the service, for transferring the security ID when performing corresponding page invoking.
10. A method of providing a service to users, the service bring formed by integrating an existing web-based application, the method comprising: providing a service inlet in a computer; receiving a service request containing an input data set submitted by a user at the service inlet; transforming the input data set in the service request submitted by the user into input parameter recognizable by the requested service using a service proxy and loading a model definition document corresponding to the service according to the service request submitted by the user, the model definition document being formed by integrating the existing web-based application; and interacting with an external resource according to the transformed input parameters and returning information obtained from the external resource to the user; wherein interacting with the external resource comprises performing request message transformation and service response message transformation by protocol adapter, wherein, the service request message transformation comprises mapping the requested operation and invoking for the service into a specific network resource revoking flow according to the loaded model definition document; and the service response message transformation comprises removing a protocol part related to a transmission protocol in the information obtained from the external resource, and transforming the information into a data part; masking inconsistency among data presentation formats, and extracting data related to the service request of the user from the data part; and assembling the extracted data related to the service request of the user as a data set with a explicit business meaning according to an output message definition the model definition document so as to return it to the user.