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How To Encode URI Data In Popular Languages

Discussion in 'Web Development' started by pradeep, Jul 27, 2012.

  1. pradeep

    pradeep Team Leader

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    URL Encoding also known as Percent-encoding is the way to encode data passed in an URI (Uniform Resource Identifier), this system is used to convert special characters to hex form prefixed with a % sign, and prevents broken URLs. An encoded URL will look like the following:

    Code:
    http://www.google.com/search?q=%26pradeep+]%3D
    In this article we'll see how URL encoding can be done in different languages:

    PHP



    PHP comes with a built-in function urlencode which Percent-encodes the string passed to it.

    PHP:
    <?php
    print '<a href="/script/home.php?user_input='urlencode($user_input), '">User Input</a>';
    ?>

    Perl



    In Perl there are multiple modules available which can do the work for you, or you can write such a subroutine yourself, let's take a look at booth examples below:

    Code:
    use URI::Escape;
    
    $url = sprintf('http://pradeep.net.in/cgi-bin/hello.pl?user_input=%s',uri_escape($user_input));
    
    sub urlencode {
        my $s = shift;
        $s =~ s/ /+/g;
        $s =~ s/([^A-Za-z0-9\+-])/sprintf("%%%02X", ord($1))/seg;
        return $s;
    }
    
    $url = sprintf('http://pradeep.net.in/cgi-bin/hello.pl?user_input=%s',urlencode($user_input));
    

    Python



    In Python the urllib module is used:

    Code:
    import urllib
    
    print "Url : http://pradeep.net.in/cgi-bin/hello.py?user_input=%s" % (urllib.quote_plus(user_input))
    

    JavaScript



    The built-in functions encodeURIComponent(str) and encodeURI(str)

    Code:
    var url = "http://pradeep.net.in/cgi-bin/hello.py?user_input=" + encodeURIComponent(user_input);
    

    ASP.Net



    ASP.Net also has a built-in function to encode URL components with special characters.

    Code:
    String sUrl;
    sUrl = "http://pradeep.net.in/cgi-bin/hello.py?user_input=" + Server.UrlEncode(sUserInput);
    
    Response.Write("<a href=" + sUrl + ">User Input</a>");
    

    References



    mark.stosberg.com
    Wiki
    Stackoverflow
     
  2. vaayaaedu

    vaayaaedu Banned

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    great reference. I was looking for URL encode in ASP
     

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