JSP and JSTL Tutorials - Tutorial Addendum - Authoritative HTTP Acknowledgment Attack Curve
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Generating Non-HTML Article Body
Sometimes, you may wish to forward aback advice in the article physique that are
not in the HTML format, for example, a PDF document, or a MS Chat Document. In this
case, we accept to set Content-Type, Content-Length and additional attack curve carefully
to accommodate actual advice about the article physique for the applicant program.
Here is a sample PHP Software to appearance you how to set attack curve for altered types
of data in the article body.
<?php #GetFile.php
# Absorb (c) 2005 by Dr. Yang, http://www.yang.com/
#
$ok = array_key_exists( QUERY_STRING , $_SERVER);
if ($ok) {
$p = $_SERVER[ QUERY_STRING ];
$ok = strlen($p)>0 && file_exists($p);
}
if ($ok) {
if (strpos($p,".html")!=false) {
header("Content-Type: text/html");
} abroad if (strpos($p,".gif")!=false) {
header("Content-Type: image/gif");
} abroad if (strpos($p,".pdf")!=false) {
header("Content-Type: application/pdf");
} abroad if (strpos($p,".doc")!=false) {
header("Content-Type: application/msword");
} abroad {
$ok = false;
}
}
if ($ok) {
header("Content-Length: ".filesize($p));
readfile($p);
} abroad {
print("<html><body>Bad request.</body></html>");
}
?>
Ideas acclimated in this script:
- The cold is to forward aback the agreeable of the requested file
in article body, and set the Content-Type and Content-Length attack curve correctly.
- The requested book name is accustomed in the concern cord of the HTTP request.
array_key_exists() is acclimated to create abiding the concern cord is provided to abstain arrangement basis error.
- The addendum of the requested book name is arrested to actuate the Content-Type
header line. strpos() is acclimated as a Boolean amount to analysis the book name extension.
- Then the requested book admeasurement is arrested to set the Content-Length attack line.
- Then the requested book is outputted to the HTTP acknowledgment with a individual action readfile().
This action name is a little bit misleading, but the action is actual useful.
- If any affair goes wrong, a HTML article is alternate with an absurdity message. A Boolean capricious $ok
is acclimated to adviser the absurdity condition.
Now let s see how this page works. Bold I accept GetFile.php, hello.html, dot.gif, hello.pdf,
and hello.doc affected to c:inetpubwwwroot directory. Of course, my IIS is configured to the PHP engine.
1. Use IE (Internet Explorer) to request: http://localhost/GetFile.php?hello.html,
you should see the accost bulletin appropriately displayed as a HTML document.
2. Use IE to request: http://localhost/GetFile.php?dot.gif,
you should see a tiny dot displayed as an image.
3. Use IE to request: http://localhost/GetFile.php?hello.pdf,
you should see IE calling Adobe Clairvoyant to affectation the accost bulletin as a PDF document.
4. Use IE to request: http://localhost/GetFile.php?hello.doc,
you should see IE calling MS Chat to affectation the accost bulletin as a MS Chat document.
5. Use IE to request: http://localhost/GetFile.php?any.file,
you should see IE announcement an absurdity message. The reason, of course, is that
the requested book doesn t exist.
6. Use IE to request: http://localhost/GetFile.php
you should see IE announcement an absurdity message. The cause is that there is no concern string
in the HTTP request.
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< src="_200x90.js">
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