Commandlink not calling method in the bean

[Mary Cole]

Hi,

 <h:form id="resdownlaod111">
                                                                <h:commandLink id="supportingfile" action="#{sBean.fileDownload}" styleClass="button" >
                                                <f:param value="#{sBean.Submission.submissionId}" name="submissionId"/>
                                                <f:param name="fileId" value="181" />
                                            <h:outputText value="Download"></h:outputText>
                                    </h:commandLink>
                                   </h:form>
 
   

I have other fields in the form,
On click of the download link, the page simply refreshes but doesn't call the fileDownload method in the bean...any idea where am wrong?

[Tim Holloway]

That's generally one of 2 things:

1. You didn't declare fileDownload as a public no-argument method returning a String in the backing bean.

2. You have a problem with some of the data that's being sent when you click the link. The JSF messages tag will usually display a message, if that's the problem.

[Mary Cole]

This is my filedownload method.. It doesn't even log the first log message

 
public void fileDownload(){
try {
logger.debug("CALLED BY BEAN ");
HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
    BufferedInputStream input = null;
    BufferedOutputStream output = null;
    submissionId = new Integer(this.getRequestParameter("submissionId")).intValue();
    int fileId = new Integer(this.getRequestParameter("fileId")).intValue();
    logger.debug("submissionId "+submissionId+" fileId "+fileId);
    
        input = getFileBytes(submissionId, fileId);
        int contentLength = input.available();
        response.reset();
        response.setContentLength(contentLength);
        response.setContentType("application/data");
        response.setHeader(
                "Content-disposition", "attachment; filename=Supporting File");
        output = new BufferedOutputStream(response.getOutputStream());
 
        // Write file contents to response.
        while (contentLength-- > 0) {
            output.write(input.read());
        }
        output.flush();
    } catch (IOException e) {
    logger.error("Error downloading the file "+e);
    }
    
    catch (Exception e) {
    logger.error("Error downloading the file exception "+e);
    }
}
 
   

[ March 28, 2008: Message edited by: Mary Cole ]

[Bob Good]

If it is an action (as opposed to actionListener) it should return a String. the string triggers navigation.

Also you want to ensure there are no javascript errors on your page.

[Mary Cole]

I tried with the action listenertoo...with no luck. The form has many other fileds with a link to the download field. I have 2 different beans in the form and the commanlink for one of the form works and downloads the file...but the same code for the other form and other bean in the same page doesn't call the method. The form gets submitted populationg the bean except calling this method

[Bob Good]

Are there any javascript errors on the page? If you are using IE, look in the bottom left corner of status line...Done it say 'Done' or 'Error'?

[Mary Cole]

Hi,

I was calling the filedownlad method using a command link and sepecifying the action as beanname.fileDownload. The problem which am facing now is , the response i get contains the whole file (from DB)inaddition to the html elements which is on the form. as the page refreshes on click of the link .. Is there any way to download only the file contents ignoring the other fields which is on the page and without submitting the whole page.
[ April 03, 2008: Message edited by: Mary Cole ]

[Bob Good]

This kind of code will send a file to the browser. It assumes 'doc' has the file contents. Make sure file has a known extension (pdf, doc, rtf, etc):

   
String fullFileName = doc.getDocumentFileName();
File file = new File(fullFileName);
String fileName = file.getName();
String contentType = "application/http";
HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
response.setContentType(contentType);
response.setHeader("Content-Disposition","attachment;filename=\"" + fileName + "\""); 
ServletOutputStream out = response.getOutputStream(); 
out.write((doc.getOutputStream()).toByteArray());
out.flush();
FacesContext.getCurrentInstance().responseComplete();