Java で、cookie を処理する方法

ずばり、J2SE のドキュメントのページ「cookie サポート」が詳しい。以下のコードを参照のこと。


String protocol = "http";
String hostname = "yourdomain.com";
int port = 80;
String file = "/";

try {

URL url = new URL(protocol, hostname, port, file);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);    // Input OK
conn.setDoOutput(true);   // Output OK
conn.setUseCaches(false); // Cache NG
conn.setRequestProperty("Content-type",
        "application/x-www-form-urlencoded");
conn.connect();           // Connect

boolean isRedirect = HttpURLConnection.getFollowRedirects();

String cookieValue = null;
try {
    Map<String, List<String>> headers = conn.getHeaderFields();
    List<String> values = headers.get("Set-Cookie");
    for (Iterator<String> iter = values.iterator(); iter.hasNext();) {
        String v = iter.next();
        if (cookieValue == null)
            cookieValue = v;
        else
            cookieValue = cookieValue + ";" + v;
    }
} catch (Exception e) {
}
System.out.println(this.getClass().getName()
        + ": cookieValue: " + cookieValue);

   conn.close();

} catch (Exception e) {
e.printStackTrace();
return false;
}