Create gradle or maven based project in your favorite tool or IDE and the name of the project is spring-rest-h2-download-file. Update the default generated content in build script. You can use any database as per your project requirements. If you are using maven based build tool for your application then you can use below pom. Create a property file called application. Or if you want to use application. I will not create any SQL script for creating table in h2 database but Spring Boot will automatically create the table for below entity class.
You may also specify any value from supporting values, such as, json, blob, arraybuffer, text. You can have a look for more details on response type. I have used three ways for downloading file — two ways for Save as functionality and one way to show the file content on browser itself.
The above line create a Blob object with file content in response and expecting the file of JSON type. The above two lines create a URL that will open the file in browser in new window. The above line shows the file content on browser, so it does not give you save as option. The above line uses ready-made FileSaver module that will open the file with Save as option. I have created service class to fetch file data from a server URL but I need to provide a link or button for downloading the file.
In the view file I will give users two options for downloading the same file. I will use link as well as button for downloading the same file from the server. In the service class I have used Http module which may not be found automatically. So I need to register it in providers array of NgModule. Hector Cuevas Hector Cuevas 1, 1 1 gold badge 6 6 silver badges 3 3 bronze badges. I used step 2 in combination with the answer from Alejandro and it worked without the need to install file-saver Thank you!
It works perfectly! I wonder if we can get the filename that is defined on the header of the response. Is that possible? This one however is not suitable for big files download. Can someone please tell why this answer is downvoted?
The topic is to download a file using angular2. If this method works to do a simple download then it should also be marked as a valid answer.
SaurabhShetty, This won't help in case you want to send custom headers, what if you want to send an auth token for example? If you look into OP question you can see he uses authHttp!
I do understand the downvotes, nevertheless this answer solved my issue. If you let the server return the url in some context, the server could prepare the url. The cover could be a url to an image in the server. When calling get Myrecord you let the server return the prepared url Cover , with security token and other headers set. It is an answer that works. Show 1 more comment. Justin Justin 8 8 silver badges 11 11 bronze badges.
How to show the filesize in the browser when the download starts? I am sending the filesize as content-length in the http header. How about this? So simple yet it is the one that work flawlessly. It doesn't clutter the DOM, doesn't create any element. I combined this solution with some of the aboves and it works like a charm.
Tobias Ernst Tobias Ernst 3, 1 1 gold badge 25 25 silver badges 24 24 bronze badges. Thanks, works with Angular 8.
Don't know why this was so hard to find. I think the reason the file gets corrupted is because you are loading res into the blob and you actually want res. As of today. Have you found a solution? Still i couldn't see the file getting downloaded.
I couldn't see any error as well. Please help — AishApp. The 2 options lets me download the file, but it loads the data in the background first. What if I have a large file that has to be downloaded? It's an option, not a header. Please fix it. The headers are created and not used. Not helpful. Show 11 more comments. Alex Dzeiko Alex Dzeiko 11 11 silver badges 12 12 bronze badges. This doesn't even require any new windows opening and stuff like that. Massimiliano Kraus 3, 5 5 gold badges 22 22 silver badges 44 44 bronze badges.
GingerBeer GingerBeer 8 8 silver badges 11 11 bronze badges. You're right, but then how can you manage server errors within the single-page application? If you have an access token you need to provide this doesn't work — chris This is plain and simple. But if you wanna do some authentication, then there is a possibility of having something like a one time token. So, instead of having it like this, you can have the url as: example. Of course its not a simple scenario and works in all the situations, but can be a solution in situation where, you have access to the database before returning the report as a stream..
Notice that this download operator accepts an optional parameter saver. Once a HTTP response is received, this function is invoked with the download content from inside the accumulator. This allows us to pass in a strategy for persisting the download to a file without directly coupling the operator to FileSaver.
By keeping FileSaver. The download operator can be tested without somehow mocking the saveAs import see here for corresponding tests. If we apply the same pattern to the service, we'll be able to test it just as easy. So let's do that by creating a custom injection token for saveAs in a file called saver. Let's use the Progress Bar from Angular Material to show how far along our download is.
The component now only has to assign an observable download to this property:. We can then subscribe to this observable through the AsyncPipe in combination with NgIf.
While the download is pending we'll display the progress bar in 'buffer' mode you may also use 'query' , otherwise the progress is determinate. The bar's value can then easily be applied from Download.
Pro Tip : If you need to map something to more than two values inside a template or rather a ternary statement won't do it for you: map the observable to the type you need or use a custom pipe instead of calling a component function from the template.
Both methods are pretty easy to write, more declarative and perform better. Here's a StackBlitz showing everything in action. The downloaded file is only 3MB, so you might want to enable throttling to see more of the progress bar. I hope this article helped you with your project. Hire me , if you need further support solving your specific problem.
Sometimes even just a quick code review or second opinion can make a great difference. With Sentry it's easy to log Angular errors server-side.
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