java - How to download a CSV file stored in server at location Temp/hello.csv -

i want download csv file @ server on location temp\hello.csv using java code

1. i have data. populating data csv file, hello.csv
2. this file saving/storing in server under \temp folder
3. the csv file gets stored @ location temp\hello.csv folder in server.
4. i want download file don't know how using java code

this should work (from https://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html#mvc-ann-async-output-stream):

@requestmapping("/download") public streamingresponsebody handle() {     return new streamingresponsebody() {         @override         public void writeto(outputstream outputstream) throws ioexception {             file file=new file("temp\hello.csv");             fileinputstream stream =new fileinputstream(file);             ioutils.copy(stream, outputstream);         }     }; } 

but there many other capabilities. (spring boot service download file , downloading file spring controllers , ...)