How to invoke the Web Service provided by an external system in Salesforce

There is a need to provide a WSDL file for the external service (salesforce only supports uploading from the local area), and the WSDL file provided has the following two requirements:

1): WSDL file can only have one binding,salesforce is not supported by multiple binding

2): WSDL file contains all schema information, Salesforce is not supported by import of external schema

The next step is the specific procedure:

1): According to this directory, Setup--> build--> Develop--> Apex Classes find the corresponding Generate from WSDL button, as shown in the following figure

2): Click on the Generate from WSDL button above, you will get the following view, click the Browser button from the local directory to select the corresponding WSDL file