Question

I want to find the size of an HTML file without HTTP headers and data transfer rate. Below is my code;

import java.net.*;
import java.io.*;

public class HttpCon 
{
  public static void main ( String[] args ) throws IOException 
  {
    Socket s = null;

    try 
    {
        String host = "host1";
        String file = "file1";
        int port = 80;

        s = new Socket(host, port);

        OutputStream out = s.getOutputStream();
        PrintWriter outw = new PrintWriter(out, false);
        outw.print("GET " + file + " HTTP/1.1\r\n");
        outw.print("Host: " + host + ":" + port + "\r\n");
        outw.print("Accept: text/plain, text/html, text/*\r\n");
        outw.print("\r\n");
        outw.flush();           

        InputStream in = s.getInputStream();
        InputStreamReader inr = new InputStreamReader(in);
        BufferedReader br = new BufferedReader(inr);
        String line;

        while ((line = br.readLine()) != null) 
        {
                System.out.println(line);
        }
        br.close();       

    } 

  }
} 

But I do not have any idea how to do this. Is there a source code that I can look at or any resource that I can apply?

Any help will be appreciated, thanks in advance.

Answer 1

What you are asking for shouldn’t be much of a problem. Read the lines until you read an empty line — that’s where the headers end. After that just go on reading and count all the characters you have read and that’s your file size. As for transfer rate:

final long start = System.nanoTime();
long charsRead = 0;
... do the transfer, counting chars ...
System.out.println("Transfer rate: " + 
  (charsRead / (1e-6 * (System.nanoTime() - start))));

The only problem here will be that you are using a BufferedReader so you count chars and not bytes. If you need bytes, then you’ll need to use the raw InputStream and then it’s going to be a slight pain in the butt to find where the headers end. You can get around that (probably) by using not the BufferedReader but the InputStreamReader, which will not read-ahead anything. When you find the end of headers, switch to the raw InputStream to read the response body.