📄 postoperation
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<?xml version="1.0" encoding="iso-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><!-- $Id: head.tmpl,v 1.5 2002/12/15 01:30:47 carstenklapp Exp $ --><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><meta name="robots" content="index,follow" /><meta name="keywords" content="Post Operation, PhpWiki" /><meta name="description" content="The standard HTTP request submitted by the parser is a GET. This note describes how to use POST, which is the usual request submitted by a form." /><meta name="language" content="" /><meta name="document-type" content="Public" /><meta name="document-rating" content="General" /><meta name="generator" content="phpWiki" /><meta name="PHPWIKI_VERSION" content="1.3.4" /><link rel="shortcut icon" href="/wiki/themes/default/images/favicon.ico" /><link rel="home" title="HomePage" href="HomePage" /><link rel="help" title="HowToUseWiki" href="HowToUseWiki" /><link rel="copyright" title="GNU General Public License" href="http://www.gnu.org/copyleft/gpl.html#SEC1" /><link rel="author" title="The PhpWiki Programming Team" href="http://phpwiki.sourceforge.net/phpwiki/ThePhpWikiProgrammingTeam" /><link rel="search" title="FindPage" href="FindPage" /><link rel="alternate" title="View Source: PostOperation" href="PostOperation?action=viewsource&version=13" /><link rel="alternate" type="application/rss+xml" title="RSS" href="RecentChanges?format=rss" /><link rel="bookmark" title="SandBox" href="SandBox" /><link rel="bookmark" title="WikiWikiWeb" href="WikiWikiWeb" /><link rel="stylesheet" title="MacOSX" type="text/css" charset="iso-8859-1" href="/wiki/themes/MacOSX/MacOSX.css" /><link rel="alternate stylesheet" title="Printer" type="text/css" charset="iso-8859-1" href="/wiki/themes/default/phpwiki-printer.css" media="print, screen" /><link rel="alternate stylesheet" title="Modern" type="text/css" charset="iso-8859-1" href="/wiki/themes/default/phpwiki-modern.css" /><style type="text/css"><!--body {background-image: url(/wiki/themes/MacOSX/images/bgpaper8.png);}--></style><title>PhpWiki - Post Operation</title></head><!-- End head --><!-- Begin body --><!-- $Id: body.tmpl,v 1.30 2002/09/02 14:36:58 rurban Exp $ --><body><!-- Begin top --><!-- $Id: top.tmpl,v 1.20 2002/12/15 01:30:47 carstenklapp Exp $ --><!-- End top --><!-- Begin browse --><!-- $Id: browse.tmpl,v 1.22 2002/02/19 23:00:26 carstenklapp Exp $ --><div class="wikitext"><h4>POST Operation</h4><p>The standard HTTP request submitted by the parser is a GET. This note describes how to use POST, which is the usual request submitted by a form.</p><p>As an example, we'll submit a form to the U.S. postal service web site.<br /><i>Note: This is suboptimal, the postal service provides tools for this type of thing: <a href="http://www.uspswebtools.com" class="namedurl"><span style="white-space: nowrap"><img src="../themes/MacOSX/images/http.png" alt="http" class="linkicon" border="0" />http://www.uspswebtools.com</span></a></i><br /></p><p>On the USPS web site, the page <a href="http://www.usps.com/zip4/citytown.htm" class="namedurl"><span style="white-space: nowrap"><img src="../themes/MacOSX/images/http.png" alt="http" class="linkicon" border="0" />http://www.usps.com/zip4/citytown.htm</span></a> has the following FORM that asks for a zip code and returns the cities or towns covered by the zip code (only form elements are shown removing all the formatting markup):</p><pre><form NAME="frmzip" ACTION="zip_response.jsp" METHOD="post" OnSubmit="return validate(frmzip)"><input type="text" id="zipcode" name="zipcode" size="5" maxlength="5" TABINDEX="10"><input TYPE="image" NAME="Submit" SRC="/zip4/images/submit.jpg" BORDER="0" WIDTH="50" HEIGHT="17" ALT="Submit" TABINDEX="11"></pre><p>From this we determine that the <tt>METHOD</tt> is <tt>POST</tt> and the form should be submitted to <tt>zip_response.jsp</tt>. This relative URL is relative to the page it is found on, so the form should be submitted to <tt>http://www.usps.com/zip4/zip_response.jsp</tt> when the <tt>Submit</tt> input is clicked. The only <tt>input</tt> element other than the <tt>Submit</tt> is a single <tt>text</tt> field that takes 5 or fewer characters. Other types of input element are described in <a href="http://www.w3.org/TR/html4/interact/forms.html" class="namedurl"><span style="white-space: nowrap"><img src="../themes/MacOSX/images/http.png" alt="http" class="linkicon" border="0" />http://www.w3.org/TR/html4/interact/forms.html</span></a>.</p><p>The basic operation is to pass a fully prepared <tt>HttpURLConnection</tt> connected to the <tt>POST</tt> target URL into the <tt>Parser</tt>, either in the constructor or via the <tt>setConnection()</tt> method. To condition the connection, use the <tt>setRequestMethod()</tt> method to set the <tt>POST</tt> operation, and the <tt>setRequestProperty()</tt> and other explicit method calls. Then write the input fields as an ampersand concatenation (<tt>"input1=value1&input2=value2&..."</tt>) into the <tt>PrintWriter</tt> obtained by a call to <tt>getOutputStream()</tt>.</p><p>The following sample program illustrates the principles using a <tt>StringBean</tt>, but the same code could be used with a <tt>Parser</tt> by replacing the last three lines in the <tt>try</tt> block with:</p><pre> parser = new Parser (); parser.setConnection (connection); // ... do parser operations</pre><p><a href="http://htmlparser.sourceforge.net/images/Zip.java" class="namedurl"><span style="white-space: nowrap"><img src="../themes/MacOSX/images/http.png" alt="http" class="linkicon" border="0" />Source</span> Code.</a> <a href="http://htmlparser.sourceforge.net/images/Zip.html" class="namedurl"><span style="white-space: nowrap"><img src="../themes/MacOSX/images/http.png" alt="http" class="linkicon" border="0" />Pretty</span> Print Source Code</a></p><pre>/* * Zip.java * POST zip code to look up cities. * * Created on April 20, 2003, 11:09 PM */import java.io.PrintWriter;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;import org.htmlparser.beans.StringBean;/** * POST zip code to look up cities. * @author Derrick Oswald */public class Zip{ String mText; // text extracted from the response to the POST request /** * Creates a new instance of Zip */ public Zip (String code) { URL url; HttpURLConnection connection; StringBuffer buffer; PrintWriter out; StringBean bean; try { // from the 'action' (relative to the refering page) url = new URL ("http://www.usps.com/zip4/zip_response.jsp"); connection = (HttpURLConnection)url.openConnection (); connection.setRequestMethod ("POST"); connection.setDoOutput (true); connection.setDoInput (true); connection.setUseCaches (false); // more or less of these may be required // see Request Header Definitions: http://www.ietf.org/rfc/rfc2616.txt connection.setRequestProperty ("Accept-Charset", "*"); connection.setRequestProperty ("Referer", "http://www.usps.com/zip4/citytown.htm"); connection.setRequestProperty ("User-Agent", "Zip.java/1.0"); buffer = new StringBuffer (1024); // 'input' fields separated by ampersands (&) buffer.append ("zipcode="); buffer.append (code); // buffer.append ("&"); // etc. out = new PrintWriter (connection.getOutputStream ()); out.print (buffer); out.close (); bean = new StringBean (); bean.setConnection (connection); mText = bean.getStrings (); } catch (Exception e) { mText = e.getMessage (); } } public String getText () { return (mText); } /** * Program mainline. * @param args The zip code to look up. */ public static void main (String[] args) { if (0 >= args.length) System.out.println ("Usage: java Zip <zipcode>"); else System.out.println (new Zip (args[0]).getText ()); }}</pre></div><!-- End browse --><!-- Begin bottom --><!-- $Id: bottom.tmpl,v 1.3 2002/09/15 20:21:16 rurban Exp $ --><!-- Add your Disclaimer here --><!-- Begin debug --><!-- $Id: debug.tmpl,v 1.9 2002/09/17 02:10:33 dairiki Exp $ --><table width="%100" border="0" cellpadding="0" cellspacing="0"><tr><td></td><td><span class="debug">Page Execution took 0.413 seconds</span></td></tr></table><!-- This keeps the valid XHTML! 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