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This article mainly introduces "how to achieve file breakpoint continuation function through Java" related knowledge, editor through the actual case to show you the process of operation, the method of operation is simple and fast, practical, I hope that this "how to achieve file breakpoint continuation function through Java" article can help you solve the problem.

What is a breakpoint continuation?

When a user uploads a large file, the network almost takes several hours. in case the line is interrupted, the server that does not have a breakpoint can only retransmit it from scratch, which allows the user to continue to transmit from the place where the upload is disconnected. this greatly reduces the user's annoyance.

Solve the problem of insufficient memory in the server for uploading large files

Solve the problem that if the upload is terminated due to other factors, and the upload can still be resumed after refreshing the browser, restart the browser (close the browser and then open) can still continue to upload, restart the computer can still upload

If the content of the file is lost due to network fluctuation during the upload process, it needs to be automatically detected and re-uploaded.

Solution

Front end

Files that need to be uploaded separately

You need to specify the file sequence number of the uploaded multipart file.

Need to monitor the upload progress and control the progress bar

After uploading, you need to send a merge request.

Blob object, manipulating fil

Back end

API for uploading parts

Interface for merging shards

Get the API for sharding

Other tool methods to assist

What you need to pay attention to at the front end is: file cutting, and progress bar

What you need to pay attention to at the back end is where the fragments are stored and how to merge the fragments.

Effect demonstration

First find the file to be uploaded

When we start uploading the progress bar, it will change, and when we click stop upload, the progress bar will stop.

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