使用Java EE和Primefaces从MySQL下载文件

Question

Well I have a database with a table that contains a BLOB field, the thing is that I need to make a link to download the files.

So far in my backing beans I have a method to generate each record with its respective file, and a method that reads the array of data.

When I use the P:Datatable to show the records I can view every single record, name and file accesing the file.methods in each one.

But I cannot find a way to make it downloadable, I has been searching the forum and the network for away to make something like this

(listadoArticulos.listado is the array of articles, each article contains a few String fields and a single blob)

I need to link to the file itself so the user can download it.

In my backing beans I need to make a method so I can link it, the method has to pass the "File" in the database to bytes (I guess)

I will apreciate any help or direction

Answer 1

You don't use JSF to generate the file download. The file download is done directly by a Java handler/servlet, which will set the content-type directly and stream the file content as bytes.