upload file docs api

Hi
I am developing java application and i need a hint to how using post method to upload file https://www.zoho.com/docs/zoho-docs-api.html#upload

Parameter	Value	Description
filename	string	Mandatory. Name of the file to be uploaded
fid	string	Optional. id of the folder where files to be uploaded to a folder
wsid	string	Optional. id of the workspace where files to be uploaded to a workspace
content	string	Mandatory. Actual document content to be uploaded

content here is string value not FileInputStream as in https://www.zoho.com/crm/help/api/uploadfile.html

so i need to know how to upload file using java.

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