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Here is a demo for your reference, We access SharePoint online and use REST API to upload a file in JAVA.
How to upload file using REST API in Java?
@Consumes annotation and set it to application octet stream. Use PUT http method. Then in the client, read bytes from file and upload. Hope this helps. Thanks for contributing an answer to Stack Overflow!
Step 1 – once you got client id and secret follow steps mentioned at – https://www.ktskumar.com/2017/01/access-sharepoint-online-using-postman/ to generate access token. using access token we can connect to share point using Rest Api or Java. This Code is working perfectly to upload file up to 249MB using SP online.
How big of a file can I upload in SharePoint?
When you need to upload a binary file that is larger than 1.5 megabytes (MB), the REST interface is your only option. For a code example that shows you how to upload a binary file that is smaller than 1.5 MB by using the SharePoint JavaScript object model, see Complete basic operations using JavaScript library code in SharePoint.
For a sample that shows you how to do many of these operations in the context of an ASP.NET web application written in C#, see SharePoint-Add-in-REST-OData-BasicDataOperations. For information about the sets of APIs available on the SharePoint platform, see Choose the right API set in SharePoint.
How does the rest interface work in SharePoint?
You can perform basic create, read, update, and delete (CRUD) operations by using the Representational State Transfer (REST) interface provided by SharePoint. The REST interface exposes all the SharePoint entities and operations that are available in the other SharePoint client APIs.
General guidelines for determining SharePoint REST endpoint URIs from the signature of the corresponding client object model APIs. Use OData query operations in SharePoint REST requests. Use a wide range of OData query string operators to select, filter, and order the data you request from the SharePoint REST service.
How to create a RESTful HTTP request in SharePoint?
You need to construct a RESTful HTTP request, using the Open Data Protocol ( OData) standard. To access SharePoint resources using REST, construct a RESTful HTTP request, using the Open Data Protocol (OData) standard, which corresponds to the desired client object model API.
The /_vti_bin/ListData.svc endpoint still exists but I think it’s deprecated. The new rest endpoint follows the odata standards. Give a call to http://mysharepointserver/_api/lists to see, if you get a result other than 403.
How does the rest endpoint work in SharePoint?
REST endpoint: The client.svc web service in SharePoint handles the HTTP request, and serves the appropriate response in either Atom or JavaScript Object Notation (JSON) format. Your client application must then parse that response. The following figure shows a high-level view of the SharePoint REST architecture.
https://www.youtube.com/watch?v=YMliU4vB_YM