Java: resume Download in URLConnection

Question

I wrote a program that downloads some files from some servers.
Currently program works properly.
But I want to add resume support to it.
I\'m doing it like this

Answer 1

Try:

connection.setRequestProperty("Range", "bytes=" + fcheck.length() + "-");

Lowercase the range specifier per the spec. Also, if your partial file was 500 bytes, that means your byte range that you have is 0-499, and you want 500+.

Answer 2

The problem is in (fcheck.length() - 1): this should be fcheck.length().