devxlogo

Produce a Hex Dump of the Contents of a URL

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("
[" + toHex(i, 4) + "] ");         System.out.print(" " + toHex(b & 0xff, 2));       }       System.out.println();     }     catch (IOException ex) {       System.err.println("error: " + ex);     }   }}
See also  Essential Measures for Safeguarding Your Digital Data
devxblackblue

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist