當您在服務器端設置一個cookie,通過稱爲HTTP Headers的cookie發送給客戶端(您的手機)。有一個名爲「Set-Cookie」的HTTP頭和一個cookie的值。當瀏覽器將來向服務器發送請求時,它將會在HTTP標頭中給出該值,稱爲「Cookie」
因此,如果您想設置一個cookie並使用該cookie,來自您的請求的Cookie,將其存儲在某個安全的地方,並在將來的請求中將其返回。
http://en.wikipedia.org/wiki/HTTP_cookie
下面是一個簡單的驗證方法,其採用的URL,用戶名和密碼,並返回Cookie值。
static public String authenticate(String service_url, String username, String password) throws IOException
{
if (username == null || password == null)
throw new IOException();
String charset = "UTF-8";
URL url = new URL(service_url);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset="+charset);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setReadTimeout(5000); // 2 second timeout.
String query = String.format("Email=%s&Password=%s",
URLEncoder.encode(username, charset),
URLEncoder.encode(password, charset));
OutputStream output = null;
try {
output = connection.getOutputStream();
output.write(query.getBytes(charset));
} finally {
if (output != null) try { output.close(); } catch (IOException logOrIgnore) {}
}
connection.getInputStream();
List<String> cookies = connection.getHeaderFields().get("Set-Cookie");
if (cookies == null)
throw new IOException();
for (String cookie : cookies)
{
if (cookie.startsWith("authcookie"))
return cookie; // this is the only correct path out.
}
throw new IOException();
}
示例HTTPGET,請注意HTTP標頭以將cookie值添加回請求。
public static InputStream getDataFromHTTP(String url, String authenticationCookie, String mimetype) throws ClientProtocolException, IOException
{
DefaultHttpClient client = getHttpClient();
if (client == null)
throw new IOException("Cant getHttpClient()");
if (url == null)
throw new IOException("URL is null");
HttpGet httpget = new HttpGet(url);
httpget.addHeader("Accept", mimetype);
httpget.addHeader("Cookie", authenticationCookie);
httpget.addHeader("Accept-Encoding", "gzip");
HttpResponse response = client.execute(httpget);
InputStream instream = response.getEntity().getContent();
Header contentEncoding = response.getFirstHeader("Content-Encoding");
if (contentEncoding != null && contentEncoding.getValue().equalsIgnoreCase("gzip")) {
instream = new GZIPInputStream(instream);
}
return instream;
}