Java Client Generated by Swagger Codegen v2 has wrong parameter type for File parameters, should use InputStream not java.io.File

Description

Using Swagger v2, and Swagger Codegen v2, if you have an API which has a File parameter, Swagger Codegen will generate a function parameter that is of type system.io.File

However, this is basically useless because it means that you cannot pass in any type of Stream, such as an in-memory stream - you can ONLY pass in a java.io.File. Because system.io.File in Java can only be used to read a file from the file system, you cannot use non-filestream sources.

This is a huge oversight, and there does not seem to be a way to configure it to use InputStream or some other more abstract type that would be sane.

This is in contrast to the .NET Swagger Codegen which correctly uses the abstract stream type instead of hard-coding File.

Swagger-codegen version

2.4.14

Swagger declaration file content or url

https://api.cloudmersive.com/swagger/api/virus

Command line used for generation

Any will reproduce

Steps to reproduce

See above

Related issues/PRs

Could not find any

Suggest a fix/enhancement

Change the template for Java to generate InputStream instead of java.io.File for File parameter types

Start with the Java client generation templates and reproduce the issue using the Cloudmersive virus API Swagger declaration with swagger-codegen 2.4.14. Check the generated method signatures for File parameters; done means those parameters use InputStream while the generated client remains usable.