DefaultHttpClient httpclient = new DefaultHttpClient();
try {
	HttpGet httpget = new HttpGet("http://yuncode.net");

	HttpResponse response = httpclient.execute(httpget);
	HttpEntity entity = response.getEntity();

	System.out.println("Login form get: " + response.getStatusLine());
	EntityUtils.consume(entity);

	System.out.println("Initial set of cookies:");
	List<Cookie> cookies = httpclient.getCookieStore().getCookies();
	if (cookies.isEmpty()) {
		System.out.println("None");
	} else {
		for (int i = 0; i < cookies.size(); i++) {
			System.out.println("- " + cookies.get(i).toString());
		}
	}

	HttpPost httpost = new HttpPost("http://yuncode.net/Login?" +
			"org=self_registered_users&" +
			"goto=/portal/dt&" +
			"gotoOnFail=/portal/dt?error=true");

	List <NameValuePair> nvps = new ArrayList <NameValuePair>();
	nvps.add(new BasicNameValuePair("IDToken1", "username"));
	nvps.add(new BasicNameValuePair("IDToken2", "password"));

	httpost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));

	response = httpclient.execute(httpost);
	entity = response.getEntity();

	System.out.println("Login form get: " + response.getStatusLine());
	EntityUtils.consume(entity);

	System.out.println("Post logon cookies:");
	cookies = httpclient.getCookieStore().getCookies();
	if (cookies.isEmpty()) {
		System.out.println("None");
	} else {
		for (int i = 0; i < cookies.size(); i++) {
			System.out.println("- " + cookies.get(i).toString());
		}
	}

} finally {
	// When HttpClient instance is no longer needed,
	// shut down the connection manager to ensure
	// immediate deallocation of all system resources
	httpclient.getConnectionManager().shutdown();
}//源代码片段来自云代码http://yuncode.net