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<TITLE>Getting the Cookies from an HTTP Connection (Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h1>The Java Developers Almanac 1.4</h1>
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        Order this book from <a href="/cgi-bin/scripts/redirect.pl?l=ex&url=http://www.amazon.com/exec/obidos/ASIN/0201752808/xeo">Amazon</a>.
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<TD valign="top"><script type="text/javascript">
<!--
google_ad_client = "pub-6001183370374757";
google_ad_width = 120;
google_ad_height = 600;
google_ad_format = "120x600_as";
google_ad_channel = "4777242811";
google_ad_type = "text_image";
google_color_border = "FFFFFF";
google_color_bg = "FFFFFF";
google_color_link = "6666CC";
google_color_url = "6666CC";
google_color_text = "000000";
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        <B><A HREF="../java.net/pkg.html#HTTP">HTTP</A></B><font color="#666666" class="xsmall-font">
            &nbsp;[4 examples]
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  <h3>e141. Getting the Cookies from an HTTP Connection</h3>

When the server wants to set a cookie in the client, it includes a
response header of the form


<pre>    Set-Cookie: <font color="#0066ff"><i>cookie-value</i></font>; expires=<font color="#0066ff"><i>date</i></font>; path=<font color="#0066ff"><i>path</i></font>; domain=<font color="#0066ff"><i>domain-name</i></font>; secure
</pre>


<code>cookie-value</code> is some arbitrary string data that should be
returned to the server in future URL requests. The life time of the
cookie is specified by <code>expires</code>. If <code>expires</code> is not specified,
the cookie expires at the end of the session.  When a URL request is
made, the cookie should be sent along only if <code>domain-name</code> matches
the end of the fully-qualified host name of the URL request and
<code>path</code> matches the beginning of the path of the URL request.  If
<code>secure</code> is specified, the cookie should be sent to the server only
through HTTPS.


<pre>    try {
        // Create a URLConnection object for a URL
        URL url = new URL(<font color="#0066ff"><i>"http://hostname:80"</i></font>);
        URLConnection conn = url.openConnection();
    
        // Get all cookies from the server.
        // Note: The first call to getHeaderFieldKey() will implicit send
        // the HTTP request to the server.
        for (int i=0; ; i++) {
            String headerName = conn.getHeaderFieldKey(i);
            String headerValue = conn.getHeaderField(i);
    
            if (headerName == null &amp;&amp; headerValue == null) {
                // No more headers
                break;
            }
            if ("Set-Cookie".equalsIgnoreCase(headerName)) {
                // Parse cookie
                String[] fields = headerValue.split(";\\s*");
    
                String cookieValue = fields[0];
                String expires = null;
                String path = null;
                String domain = null;
                boolean secure = false;
    
                // Parse each field
                for (int j=1; j&lt;fields.length; j++) {
                    if ("secure".equalsIgnoreCase(fields[j])) {
                        secure = true;
                    } else if (fields[j].indexOf('=') &gt; 0) {
                        String[] f = fields[j].split("=");
                        if ("expires".equalsIgnoreCase(f[0])) {
                            expires = f[1];
                        } else if ("domain".equalsIgnoreCase(f[0])) {
                            domain = f[1];
                        } else if ("path".equalsIgnoreCase(f[0])) {
                            path = f[1];
                        }
                    }
                }
    
                // Save the cookie...
            }
        }
    } catch (MalformedURLException e) {
    } catch (IOException e) {
    }
</pre>
Here's a sample of cookies from two websites:

<pre>    B=a43ka6gu6f4n4&amp;b=2; expires=Thu, 15 Apr 2010 20:00:00 GMT;
        path=/; domain=.yahoo.com
    
    PREF=ID=e51:TM=686:LM=86:S=BL-w0; domain=.google.com; path=/;
        expires=Sun, 17-Jan-2038 19:14:07 GMT
</pre>
<P><table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
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            &nbsp;<b>Related Examples</b></font></td>
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e140. <a class="eglink" href="GetHeaders.html?l=rel">
    Getting the Response Headers from an HTTP Connection
</a>
<br>

e142. <a class="eglink" href="SendCookie.html?l=rel">
    Sending a Cookie to an HTTP Server
</a>
<br>

e143. <a class="eglink" href="NoRedirect.html?l=rel">
    Preventing Automatic Redirects in a HTTP Connection
</a>
<br>


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<br>
        See also: 
<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Datagram">
    Datagram
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Encodings">
    Encodings
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Hostnames%20and%20IP%20Addresses">
    Hostnames and IP Addresses
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Multicast">
    Multicast
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Sockets">
    Sockets
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.net/pkg.html?l=rel#URLs">
    URLs
</a>&nbsp;&nbsp;

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