how to transfer binary file from gwt java and external js ? how to save existed memory file to server from gwt java ?

I'm newbie to gwt, there're two questions needs community help, one is how to transfer a binary file  between gwt java and external js ? how to organize the parameters format in respective side ?

another question is how to upload a memory file to server , I don't means that  FileUpload widget, in my case, I need to save a xml file created by java to server , and server don't use GWT.

thanks in advance !

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