10 Replies Latest reply on Jan 7, 2009 4:05 AM by meetoblivion

How to create a view that displays a file.

meetoblivion Jan 4, 2009 4:59 AM

So I've created a page in my app to allow for file uploads. It's currently restricted to images. I have it working so that an entity is created w/ information about the file, and the tmp file that richfaces creates is copied to a path that's stored w/ the entity.

If I was dealing w/ a plain servlet, it'd be easy enough to just modify the header info, tell it to expect an attachment, give it the name, etc. How do I do something similar using Seam/JSF?

1. Re: How to create a view that displays a file.

kukeltje.ronald.jbpm.org Jan 4, 2009 6:57 AM (in response to meetoblivion)

Like this?
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2. Re: How to create a view that displays a file.

meetoblivion Jan 4, 2009 6:21 PM (in response to meetoblivion)

Sort of. That seems to be able to create an HTML tag (a, img, etc) but i'm looking for something that I can just link to directly.

instead of creating a page like this:

<html  xmlns="http://www.w3.org/1999/xhtml"><head><script src="/a4j/g/3_3_0.BETA4/org/ajax4jsf/framework.pack.js" type="text/javascript"></script><script src="/a4j/g/3_3_0.BETA4/org/richfaces/ui.pack.js" type="text/javascript"></script><link class="component" href="/a4j/s/3_3_0.BETA4/org/richfaces/skin.xcss/DATB/eAGbo7-tNnT5DGkAEXoDrg__" rel="stylesheet" type="text/css" /></head><img id="j_id0" src="/a4j/s/3_3_0.BETA4org.ajax4jsf.resource.UserResource/n/s/0/DATA/eAF1VEtrFEEQrmw2uL6jUYMH8YkvtCdKjEpUXONrw8ZANgZUUHpneze9zkxPuns2o6LgwYuviydB8eBVD-pRD3pREAWJ4C8IiIggQtSj1b2bZFx0D8tMT1V9X9X3VT!6Bm1KwlYhK4RWadxdVWUimRKRdBk5qZgcarxsOCn5YaopmF!Hrq8pSOdhoSsZ1axPBJoFWsPSfJXWqOPRoOIMFqvM1b15mMPikGPNMbgCLXnI-KLEy5yVGu9tNepFzL7EIXLZaErEpExdpogr!FAEWJsUNAIdF16JyQKtMXnq7bP9d-69H0hBKg9zXY8qdYL67G8OBS15UEEO8xTmlGwNDSvqLLlwCkxy6vGLtOix3jg08JsQkqgosAQ8phVhHhmmlQGmR0XpSBxiJ4qLwM4BoGUBQCxhZZ00hjbHPXXe3pj81X07ZeM6ZuJmKz28dr3w4!TEPhNhGKw1YlSLQlno5no5P!SK3zun5r9aMmCwzeAy4yth-fpLNc7Gcz6tMFJhAZM4r8sAkYSOM7ZhYmTBOdqRPJ4Y-fxl1aVjFhR7SWlYZrgRLshgpMNIYyCjvoZ2e2xz65KGYTzeB1mn7CtnFjIe1b635uCebTu6dq!5yxb71!2T2rr6vLfNdqsQj3C0Enov1KQf6RxiNMhNnwg51X9858jV3A0rerqIHxsmmmue-4wJNCxJmNAe9aJAm!8LMySETkCIu4fl1MvMHPT3aVjMVQFJ9U270Dh--tm4zaDjGqT1hRCd15NHEMcq55heHBoEAm2LblHOTF9OAmwY89Cd7REuWuIYm2ivNxFp7jl5rjS6s0XDQsnGIqY0Kx3lHrsiobuprQRiYpKJ0gaxYV1Yai25aFbfI0HkJz-GGlqzJ06hJ61viWFDslLSC4ZSfHVi1d039H4rtOQgrfhF3HPjpPG0-cekZmldIVljP-yNESfnfvbjp!yt3wfa63vSnDozPZItKi2pm0y9NtL6YnjyzJOUuV7-IVAcGp06kRFpGhdWChQWQ4XIkPC8InXPJ4Y1MP!nogc7vm8xnEyJ1bZOjIW2m1tC0xKheGmQMorh0wA3zzdXFS4GGUoK1fWav7u578Nza9uMiU6YJ2PED6bNFOPMF!f07O3adc6jEle5GlY0tPWL0SBbM!Dr!wC9JPPY" /></html>

I just want a url that I can point to like this..

/a4j/s/3_3_0.BETA4org.ajax4jsf.resource.UserResource/n/s/0/DATA/eAF1VEtrFEEQrmw2uL6jUYMH8YkvtCdKjEpUXONrw8ZANgZUUHpneze9zkxPuns2o6LgwYuviydB8eBVD-pRD3pREAWJ4C8IiIggQtSj1b2bZFx0D8tMT1V9X9X3VT!6Bm1KwlYhK4RWadxdVWUimRKRdBk5qZgcarxsOCn5YaopmF!Hrq8pSOdhoSsZ1axPBJoFWsPSfJXWqOPRoOIMFqvM1b15mMPikGPNMbgCLXnI-KLEy5yVGu9tNepFzL7EIXLZaErEpExdpogr!FAEWJsUNAIdF16JyQKtMXnq7bP9d-69H0hBKg9zXY8qdYL67G8OBS15UEEO8xTmlGwNDSvqLLlwCkxy6vGLtOix3jg08JsQkqgosAQ8phVhHhmmlQGmR0XpSBxiJ4qLwM4BoGUBQCxhZZ00hjbHPXXe3pj81X07ZeM6ZuJmKz28dr3w4!TEPhNhGKw1YlSLQlno5no5P!SK3zun5r9aMmCwzeAy4yth-fpLNc7Gcz6tMFJhAZM4r8sAkYSOM7ZhYmTBOdqRPJ4Y-fxl1aVjFhR7SWlYZrgRLshgpMNIYyCjvoZ2e2xz65KGYTzeB1mn7CtnFjIe1b635uCebTu6dq!5yxb71!2T2rr6vLfNdqsQj3C0Enov1KQf6RxiNMhNnwg51X9858jV3A0rerqIHxsmmmue-4wJNCxJmNAe9aJAm!8LMySETkCIu4fl1MvMHPT3aVjMVQFJ9U270Dh--tm4zaDjGqT1hRCd15NHEMcq55heHBoEAm2LblHOTF9OAmwY89Cd7REuWuIYm2ivNxFp7jl5rjS6s0XDQsnGIqY0Kx3lHrsiobuprQRiYpKJ0gaxYV1Yai25aFbfI0HkJz-GGlqzJ06hJ61viWFDslLSC4ZSfHVi1d039H4rtOQgrfhF3HPjpPG0-cekZmldIVljP-yNESfnfvbjp!yt3wfa63vSnDozPZItKi2pm0y9NtL6YnjyzJOUuV7-IVAcGp06kRFpGhdWChQWQ4XIkPC8InXPJ4Y1MP!nogc7vm8xnEyJ1bZOjIW2m1tC0xKheGmQMorh0wA3zzdXFS4GGUoK1fWav7u578Nza9uMiU6YJ2PED6bNFOPMF!f07O3adc6jEle5GlY0tPWL0SBbM!Dr!wC9JPPY

3. Re: How to create a view that displays a file.

meetoblivion Jan 4, 2009 6:42 PM (in response to meetoblivion)

Sorry for scrolling.

I should have made it clear - how do i make user avatars like this site uses?
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4. Re: How to create a view that displays a file.

kukeltje.ronald.jbpm.org Jan 4, 2009 10:49 PM (in response to meetoblivion)

The resources are provided via a servlet. That is the 'jsf' way of doing it and also the seam way. What you could do is create a small jsf component that creates this url for you (that is what e.g. the script and style tags in richfaces do)
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5. Re: How to create a view that displays a file.

joblini Jan 4, 2009 11:25 PM (in response to meetoblivion)

You can find the full source code for this website in the Seam package in the directory /examples/wiki.
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6. Re: How to create a view that displays a file.

meetoblivion Jan 4, 2009 11:26 PM (in response to meetoblivion)

I think I'm asking for the wrong thing.

I think all I need is some use of resteasy to accomplish this.
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7. Re: How to create a view that displays a file.

danielc.roth Jan 6, 2009 5:32 PM (in response to meetoblivion)

http://in.relation.to/Bloggers/FileDownloadSupport maybe... ?
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8. Re: How to create a view that displays a file.

meetoblivion Jan 7, 2009 3:53 AM (in response to meetoblivion)

that looks fine too, but I ended up doing it using resteasy. Not bad to be honest.

@Name("viewImage")
@Path("/viewimage")
public class ViewImage implements java.io.Serializable{
        @In(create=true) StoredFileDAO    storedFileDAO;
        @In(create=true) UserDAO                  userDAO;
        @In(create=true) ConfigSettingDAO configSettingDAO;
        @In(create=true) AvatarDAO        avatarDAO;
        
        @GET
        @Path("/{username}/{filename}")
        @ProduceMime("image/jpeg")
        public byte[] viewImage(@PathParam("username")String username
                        ,@PathParam("filename")String filename) {
                User u = userDAO.findUserByUsername(username);
                if(u == null) return defaultImage();
                StoredFile storedFile = storedFileDAO.getByUserAndName(u, filename);
                if(storedFile == null) return defaultImage();
                ConfigSetting setting = configSettingDAO.get("NFS_BASE_MOUNT");
                String value = setting.getSettingValue();
                String userDir = value + "/" +storedFile.getUser().getUsername();
                File f = new File(userDir+"/"+storedFile.getName());
                int size = storedFile.getSize();
                if(f.exists()) {
                        try {
                                FileInputStream fis = new FileInputStream(f);
                                byte[] b = new byte[size];
                                fis.read(b);
                                return b;
                        } catch (IOException e) {
                                return defaultImage();
                        }
                } else { 
                        return defaultImage();
                }
        }
}

defaultImage() returns a simple 404 image not found type of graphic. I didn't see any indication, and I wanted to avoid crashing my system, so I didn't try to see what happens if this returns a java.io.File rather than a byte[], I would kind of prefer a File though. as it seems unnecessary to handle the IOException on a file that was written there using this app and therefore must be owned by this app.

9. Re: How to create a view that displays a file.

joblini Jan 7, 2009 4:02 AM (in response to meetoblivion)
Excellent! Thanks for posting your solution.

These annotations are for restEasy?

@GET @Path("/{username}/{filename}") @ProduceMime("image/jpeg")
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10. Re: How to create a view that displays a file.

meetoblivion Jan 7, 2009 4:05 AM (in response to meetoblivion)

well, from jax-rs. it's based on the examples in the seam docs for resteasy.
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