@requestmapping download file

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October 31, at am. Rasu says:. August 17, at am. Pankaj says:. RequestParam without 'value' element Just like PathVariable , 'value' element of RequestParam annotation can be skipped if the target variable name is same as param name.

IllegalStateException: Ambiguous mapping. Cannot map 'myMvcController' method public java. String com. Model mapped. Spring TestContext Framework 4. Java Servlet API 3. JDK 1. Nice summary. The only thing missing to make it a little better would be to show that handling of Objects both as input in a POST for example and as a response. Why would one add ResponseBody annotation in a class annotated with RestController? RestController itself contains ResponseBody….

So, one should always be explicit, to avoid possibly nondeterministic behavior if multiple annotations can apply to the same request URL. Java is the brandd and most powerful programmic language ever. Your email address will not be published.

Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. Using the Spring RequestMapping Annotation.

You can see how Spring MVC will map the other methods using this same logic. Using RequestMapping with Producible and Consumable The request mapping types can be narrowed down using the produces and consumes elements of the RequestMapping annotation.

RequestMapping with Headers The RequestMapping annotation provides a header element to narrow down the request mapping based on headers present in the request.

RequestMapping with Request Parameters The params element of the RequestMapping annotation further helps to narrow down request mapping. Here is an example of a default handler method. Learn Spring Framework 5! Enroll in my Spring Framework 5: Beginner to Guru course! RequestMapping Shortcuts Spring 4. RequestMapping Conclusion As you can see in this post, the RequestMapping annotation is very versatile. Share About jt. You May Also Like. By jt Java , Lombok , Spring.

By jt Docker , Spring Boot. By jt Java , Spring. By jt Spring Boot. Something like response. Francis what if your application downloads different file types? Lobster's answer enables you to dynamically set the content disposition. I guess not, because it's not scalable. We are currently supporting a dozen types of resources.

We might support more file types based on what users want to upload in that case we might end up with so many end points essentially doing the same thing. IMHO there has to be only one download end point and it handles multitude of file types. Francis — Rose. Ralph Ralph k 49 49 gold badges silver badges bronze badges.

FaisalFeroz: yes this is right, but the file document is anyway created in memory see the question: "PDF needs to be generated within the code". Anyway - what is your solution that overcome this problem? You may also use ResponseEntity which is a super of HttpEntity which allows you to specify the response http status code. Is there a reason why you are replacing whitespaces with underscore in the filename?

You can wrap it in quotes to send the actual name. Show 1 more comment. InputStreamResource If your resource is not a file, e. You don't advise for the use of the FileSystemResource class? It is even advisable if your resource is a file. About the file length calculation part: If you are worried, don't be. File length should be good enough in the general case.

I just mentioned it because it does can be slow , specially if the file is in a remote system or something more elaborated like that - a database, maybe?. But only worry if it becomes a problem or if you have hard evidence it will become one , not before. The main point is: you are making an effort to stream the file, if you have to preload all of it before, then the streaming ends up making no difference, eh? It downloads 0 bytes file.

Am I missing something? Show 5 more comments. Please try again. BorisR 1 1 silver badge 15 15 bronze badges. Sunil Sunil 6 6 silver badges 12 12 bronze badges. The resource could be: ByteArrayResource FileSystemResource UrlResource or even GridFsResource If you need to download a file from application resources directory, check out my answer : it explains how to locate the resource in class path using ClassPathResource Be aware of possibly wrong Content-Type header set see FileSystemResource is returned with content type json.

You can use the Content-Disposition header to satisfy this requirement: The first parameter in the HTTP context is either inline default value, indicating it can be displayed inside the Web page, or as the Web page or attachment indicating it should be downloaded; most browsers presenting a 'Save as' dialog, prefilled with the value of the filename parameters if present.