Download file from nexus using java

Collectives on Stack Overflow. Learn more. Asked 2 years ago. Active 2 years ago. Viewed times. Improve this question. Satyajeet Satyajeet 15 6 6 bronze badges. What did you mean random file? Did you get different files after visiting the URL every time?

It seems that your request has been redirected. Please see this: Found Document has Moved error. File is there as i can see via logged in from browser. We could wrap all the logic into a Callable , or we could use an existing library for this.

Notice that we've overridden the onBodyPartReceived method. This could lead to high memory consumption, or an OutOfMemory exception when trying to download a large file. Instead of accumulating each HttpResponseBodyPart into memory, we use a FileChannel to write the bytes to our local file directly. ByteBuffers have the advantage that the memory is allocated outside of the JVM heap, so it doesn't affect out applications memory. We can see from the Javadoc that there's a utility class named FileUtils that is used for general file manipulation tasks.

The underlying code uses the same concepts of reading in a loop some bytes from an InputStream and writing them to an OutputStream.

One difference is the fact that here the URLConnection class is used to control the connection timeouts so that the download doesn't block for a large amount of time:. Considering internet connections fail from time to time, it's useful for us to be able to resume a download, instead of downloading the file again from byte zero.

Now that we have the total content size of the file, we can check whether our file is partially downloaded. If so, we'll resume the download from the last byte recorded on disk:. What happens here is that we've configured the URLConnection to request the file bytes in a specific range. The range will start from the last downloaded byte and will end at the byte corresponding to the size of the remote file.

Another common way to use the Range header is for downloading a file in chunks by setting different byte ranges. For example, to download 2 KB file, we can use the range 0 — and — Another subtle difference from the code at section 2.

After we've made this change the rest of the code is identical to the one we've seen in section 2. This implementation is safe to use even for large files because we don't load the whole file into memory.

The configuration as code yaml is below. This will create the credential, jobs required, and configured the maven tool. You can find where those details are in the comments of the file. Jenkins has a capability which allow you to run Groovy code whenever Jenkins is started. This what it does is to create a script Do you guess what language? The script basically build an existing job which is defined in the Jenkins configuration as code file with name: nexus-create-repo.

This is only required If instead of pushing the artifacts to a repository other than the one we have used in this article, which is repository-example.