transferring images

[lowbk]

hello, i need some advice on this.
currently, my program can transfer textual xml via http ie URLConnection, getOutputStream() and getInputStream()

i want to transfer image as well, is it easier to embed it inside the xml? if so, how? or is it easier to put a link in the xml stating the location of the image? but how to send the image over in the first place?

any kind soul pls advise

 

[wushutwist]

You could easily base64 encode the image file into the XML document and then on the other side you could base64 decode the file. There are a bunch of packages out there with base64 encoders and it is not that hard to write your own if you wanted to.

Another alternate is to treat the image as a Java object and just serialize/deserialize it.

 

[IPOz]

You can transfer image using DataOutputStream/DataInputStream. IPO_z@cmmail.com
Garbage in,Garbage out

 

[lowbk]

wushutwist and ipoz, thank you for your suggestion.

wushutwist, how do i serialize/deserialize it? what/where are the tools for doing so?

actually i have a vector of images, i want to serialize/deseralize the vector. guess that would be much easier than processing each image within the vector.

 

[lowbk]

i suddenly remember java vector got a tostring(), so that solves the serializing, but how to convert it back to vector? any suggestion?

the vector contains images, and image name.

 

[IPOz]

The following is some code snippet from our project,Maybe it will not help you however i hope it will give you some suggestion:

----------MyServlet.java
...
CachedRowSet crs = (CachedRowSet)ret;
while (crs.next()) {
byte[] pic = crs.getBytes("flat_pic" //flat_pic is a field containing a flat picture
DataOutputStream out = new DataOutputStream(resp.getOutputStream());
out.write(pic);
out.close();
}
...

----------MyApplet.java
...
java.net.URLConnection con = url.openConnection();
DataInputStream in = new DataInputStream(con.getInputStream());
byte[] buf = new byte [100 * 1024];
ByteArrayOutputStream buffer = new ByteArrayOutputStream(100 * 1024);
int bytesRead = 0 ;
while((bytesRead = in.read(buf)) != -1) {
buffer.write(buf, 0, bytesRead);
}
in.close();

Toolkit tool = getToolkit();
Image image1 = tool.createImage(buffer.toByteArray());
...
I donot think it is a good code but i works .

Best Regards! IPO_z@cmmail.com
Garbage in,Garbage out

 

[wushutwist]

FYI, toString() does not output a serialized version of the object.

 

[lowbk]

wushutwist and ipoz, i got my solution already.
i would like to share how it is done

on the sending side,
Vector v //assuming containing images, data etc
ByteArrayOutputStream tmpbyte = new ByteArrayOutputStream();
ObjectOutputStream tmpobjstream = new ObjectOutputStream(tmpbyte);
tmpobjstream.writeObject(v);
tmpobjstream.flush();

on the receiving side,
ByteArrayInputStream tmpbytestream = new ByteArrayInputStream....//read in and form the buffer
ObjectInputStream tmpobjstream = new ObjectInputStream(tmpbytestream);
Vector v = (Vector)tmpobjstream.readObject();