Re: Download link from DynamicWebResource?

[Jan Kriesten]

hi nino,

i use something like that to download dynamically generated excel-files.

to get a resourcestream, i use this class:
---
package wicket.util;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;

import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
import org.apache.wicket.util.time.Time;

public class ByteArrayResourceStream
    implements IResourceStream
{
  private static final long serialVersionUID = 1L;
  private Locale locale = null;
  private byte[] content = null;
  private String contentType = null;

  public ByteArrayResourceStream( byte[] content, String contentType )
  {
    this.content = content;
    this.contentType = contentType;
  }

  public void close( )
      throws IOException
  {
  }

  public String getContentType( )
  {
    return(contentType);
  }

  public InputStream getInputStream( )
      throws ResourceStreamNotFoundException
  {
    return(new ByteArrayInputStream( content ));
  }

  public Locale getLocale( )
  {
    return(locale);
  }

  public long length( )
  {
    return(content.length);
  }

  public void setLocale( Locale locale )
  {
    this.locale = locale;
  }

  public Time lastModifiedTime( )
  {
    return null;
  }
}
--8<---

then i just implement a link to my resource:

---8<---
  public class XlsLink
      extends Link
  {
    private static final long serialVersionUID = 1L;
    byte[] xls = null;

    public XlsLink( String id, byte[] xls )
    {
      super( id );
      this.xls = xls;
    }

    public void onClick( )
    {
      IResourceStream resourceStream = new ByteArrayResourceStream( xls,
"application/vnd.ms-excel" );
      getRequestCycle().setRequestTarget( new ResourceStreamRequestTarget(
resourceStream )
      {
        public String getFileName( )
        {
          return("export.xls");
        }
      } );
    }
  }
---8<--

that's all about it.

best regards, --- jan.


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