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StreamResult and Struts2 Image uploading to jsp : How To

Posted on 2010-11-23
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Last Modified: 2013-11-24
I have an application where I want to use a streamresult in struts2 to serve blobs as images on a
jsp page.

If somebody could point me to a good example I would appreciate it.
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Question by:yojimbojim
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LVL 7

Expert Comment

by:techsathish
Comment Utility
public class FileUploadAction implements Serializable {
      byte[] image;

      public byte[] getImage() {
            return image;
      }

      public void setImage(byte[] image) {
            this.image = image;
      }

      /** Don't invoke this. Used by Hibernate only. */
      public void setImageBlob(Blob imageBlob) {
            this.image = this.toByteArray(imageBlob);
      }

      /** Don't invoke this. Used by Hibernate only. */
      public Blob getImageBlob() {
            return Hibernate.createBlob(this.image);
      }

      private byte[] toByteArray(Blob fromBlob) {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            try {
                  return toByteArrayImpl(fromBlob, baos);
            } catch (SQLException e) {
                  throw new RuntimeException(e);
            } catch (IOException e) {
                  throw new RuntimeException(e);
            } finally {
                  if (baos != null) {
                        try {
                              baos.close();
                        } catch (IOException ex) {
                        }
                  }
            }
      }

      private byte[] toByteArrayImpl(Blob fromBlob, ByteArrayOutputStream baos)
                  throws SQLException, IOException {
            byte[] buf = new byte[4000];
            InputStream is = fromBlob.getBinaryStream();
            try {
                  for (;;) {
                        int dataSize = is.read(buf);

                        if (dataSize == -1)
                              break;
                        baos.write(buf, 0, dataSize);
                  }
            } finally {
                  if (is != null) {
                        try {
                              is.close();
                        } catch (IOException ex) {
                        }
                  }
            }
            return baos.toByteArray();
      }
}

Use this Action class and create the proper hibernate file..
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Accepted Solution

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techsathish earned 500 total points
Comment Utility
Use struts tag

<s:file name="upload" label="File"/>

public class StrutsFileUpload extends ActionSupport {
 
    private File upload;//The actual file  
    private String uploadContentType; //The content type of the file
    private String uploadFileName; //The uploaded file name
    private String caption;//The caption of the file entered by user
   
    public String execute() throws Exception {
          ActionContext ctx= ActionContext.getContext();      
        HttpServletRequest fpmsrequest =(HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);
        //String strFile = fpmsrequest.getParameter("upfile").toString();
        System.out.println(" File " + getUpload().getAbsoluteFile() );
          return SUCCESS;
    }
  public String getCaption() {
            return caption;
      }

      public void setCaption(String caption) {
            this.caption = caption;
      }

public File getUpload() {
    return upload;
  }
  public void setUpload(File upload) {
    this.upload = upload;
  }
  public String getUploadContentType() {
    return uploadContentType;
  }
  public void setUploadContentType(String uploadContentType) {
    this.uploadContentType = uploadContentType;
  }
  public String getUploadFileName() {
    return uploadFileName;
  }
  public void setUploadFileName(String uploadFileName) {
    this.uploadFileName = uploadFileName;
  }
 
}

This example shows how to upload a image using Struts 2... Any doubt just let me know..
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