//Compile it by
//  javac Validator.java
//
//Modify INPUT_HTML_FILE and run it by
//  java Validator INPUT_HTML_FILE
//
//Then the program will send the INPUT_HTML_FILE to the W3C validator
//(http://validator.w3.org/check) and print out the output.

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

class Validator
{
  static final String link = "http://validator.w3.org/check";
  
  public static void main(String [] args) throws Exception
  {
    //create http connection with multipart/form-data Content-Type
    //i.e. simulating "Validate by File Upload"
    String boundary = "AaB03x", eol = "\r\n", s;
    HttpURLConnection httpC = (HttpURLConnection)new URL(link).openConnection();

    httpC.setDoOutput(true);
    httpC.setDoInput(true); 
    httpC.setUseCaches(false);

    httpC.setRequestMethod("POST");
    httpC.setRequestProperty("Connection", "Keep-Alive");
    httpC.setRequestProperty("Content-Type", "multipart/form-data; boundary="
	                     + boundary);
    httpC.setRequestProperty("Content-Length", "xxx");
    
    //send the html file to w3c
    DataOutputStream out = new DataOutputStream(httpC.getOutputStream());
    s = "--" + boundary + eol
      + "Content-Disposition: form-data; name=\"ss\"" + eol
      + "Content-Type: text/html; charset=ISO-8859-1" + eol
      + eol + 1 + eol
      + "--" + boundary + eol
      + "Content-Disposition: form-data; name=\"uploaded_file\"; filename=\""
      + args[0] + "\"" + eol
      + "Content-Type: text/html; charset=ISO-8859-1" + eol + eol;
    out.writeBytes(s);

    BufferedReader in = new BufferedReader(new FileReader(args[0]));
    for(; (s = in.readLine()) != null; )
      out.writeBytes(s + "\n");
    in.close();

    out.writeBytes( eol + "--" + boundary + "--" + eol);
    out.flush();
    out.close();

    //read and print the results from w3c
    in = new BufferedReader(new InputStreamReader(httpC.getInputStream()));
    for(; (s = in.readLine()) != null; )
      System.out.println(s);
    in.close();
  }
}