How get Image byte size & transfer Image over Socket?
 

I am trying to transmit an Image object through a Socket connection in Java. The only thing I may be missing is how to get an image size in bytes so I know how many bytes are being transferred over the Socket.

I have the ServerSocket and Client working transferring data, and I have a cut-paste image working from a client Applet, and I have a Java program that saves Images to disk as JPEG/PNG.

How do you get the byte size of an Image object in Java?... or do you know of source code to a program that transferes images through Sockets?

Thanks,
Jon

Re: How get Image byte size & transfer Image over Socket?
 

ı couldn't understand why you wanna get image byte size. as a result
images are also files. so you can trnsfer you images as a byte streams.
just read image file with an inputstream and write it to socket outputstream.


InputStream input=new FileInputStream("image.png");
byte[] buffer=new byte[1024];
int readData;
while((readData=input.read(buffer))!=-1){
socketOutput.write(buffer,0,readData);
}

Re: How get Image byte size & transfer Image over Socket?
 

I cant read from a file stream, because the client application is an Applet (browser applet) in this client/server image transrfer program. You can't access files from an Applet in Java.

I can paste an Image into the Applet and cast it to a BufferedImage object, but I don't know how to send the BufferedImage object over a Socket. I need the size of the BufferedImage object so I can notify the server Java application of how many bytes it is to expect on the receiving end.

Jon

Re: How get Image byte size & transfer Image over Socket?
 

I've had the same problem as you, and finally my solution was the next one:

BufferedImage bIResult = null;
// Fill your bufferedImage
ByteArrayOutputStream bos = new ByteArrayOutputStream();
boolean resultWrite = ImageIO.write(bIResult, "PNG", bos);
byte[] imageInBytes = bos.toByteArray();
int length = imageInBytes.length;

Sincerily,

Isabel

Re: How get Image byte size & transfer Image over Socket?
 

In client applet i have a code

 import java.applet.*;

import java.awt.*;

import java.awt.event.*;

import java.awt.image.*;

import java.io.*;

import java.net.*;

import javax.imageio.*;

public class test_client extends Applet {

    public void init() {

        Button b = new Button("submit6");

        b.addActionListener(new ActionListener() {

          public void actionPerformed(ActionEvent ae) {

             showStatus("button pressed");

             try {

                BufferedImage bi =new BufferedImage(100,100,BufferedImage.TYPE_INT_ARGB);

                Graphics2D g2 = bi.createGraphics();

            Graphics g = getGraphics();

                g.setColor(Color.BLUE);

                g.drawLine(100,100,200,200);

            g2=(Graphics2D)g;   

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                ImageIO.write(bi,"JPEG",baos);

                byte[] buf = baos.toByteArray();

                URL url = new URL(http://10.70.70.1:8080/servlet/send_testclient");

                HttpURLConnection con =(HttpURLConnection)url.openConnection();

            

                con.setDoInput(true);

                con.setDoOutput(true);

                con.setRequestMethod("POST");

            con.setRequestProperty("Content-Type", "application/octet-stream");   

                OutputStream os = con.getOutputStream();

                os.write(buf);

                os.flush();

                os.close();

            InputStream is = con.getInputStream();

                int c;

                while ((c = is.read()) != -1)

                  System.out.write(c);

                System.out.println();

                is.close();

                //os.close();

                con.disconnect();

            } catch (Exception e) {

                 showStatus(e.toString());

            // System.out.println(e);   

            }

         }

      });

      add(b);

   }

}

I dont know how to get the image data in server side( servlet) and store as jpg pr png file.

please help me regarding this.

i need server side code.

Thanks in advance for helping me

Re: How get Image byte size & transfer Image over Socket?
 

anyone is available to help me:(

Re: How get Image byte size & transfer Image over Socket?
 

Why don't you Google "Java File Upload" and send a normal file upload requesst.

Re: How get Image byte size & transfer Image over Socket?
 

In client side I couldnt have image file.

Only I have Byte Array. I need to send to server( servlet) then i ll store it to jpeg file.

I tried the servlet code like this

            InputStream in = req.getInputStream();

            int count;

            byte[] buffer = new byte[8192];

            FileOutputStream fis = new FileOutputStream("new.jpg");

            while ((count = in.read(buffer)) > 0){

                fis.write(buffer, 0, count); 

                fis.flush();

            }

            fis.close();

But i didnt find any file name as new.jpg in my server.

Please help me

Re: How get Image byte size & transfer Image over Socket?
 

Do what I suggested in the post. On a fileupload the server gets an inputstream. How that inputstream originates doesn't matter. Investigate "File Upload" streams. Both how to receive one in a Servlet, and how to initiate one using an HttpUrlConnection, and your problem is solved.

Re: How get Image byte size & transfer Image over Socket?
 

Thanks for ur reply.

I am new java and servlet.

If u know abt how to store image into server.

Please help me.

thanks