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Tip of the Day
Language: Java
Expertise: Beginner
Aug 6, 2003

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Produce a Hex Dump of the Contents of a URL

This program opens connection with a specified URL and hex-dumps the contents received from an associated input stream. Use this to find out what's going on with your browser.

public class UrlHexDump {

   static final char[] hexes = "0123456789abcdef".toCharArray();

   public static String toHex(int value, int length) {
     StringBuffer b = new StringBuffer(length);
     while(length-- > 0) {
       b.append(hexes[value & 0xf]);
       value >>= 4;
     }
     return b.reverse().toString();
   }

   public static void main(String[] args) {
     try {
       URL url = new URL(args[0]);
       URLConnection connection = url.openConnection();
       InputStream is = connection.getInputStream();
       int n = connection.getContentLength();
       String type = connection.getContentType();
       System.out.println(type + ": " + n + " bytes.");

       for (int i = 0; i < n; i++) {
         int b = is.read();
         if (b < 0) break;
         if ((i) % 32 == 0) System.out.print("\r\n[" + toHex(i, 4) + "] ");
         System.out.print(" " + toHex(b & 0xff, 2));
       }
       System.out.println();
     }
     catch (IOException ex) {
       System.err.println("error: " + ex);
     }
   }
}
Vlad Patryshev
 
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