java发送http head请求

	public static void main(String[] args) throws Exception {
		URL url = new URL("http://www.iteye.com/");
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();

		// conn.setDoOutput(true);
		conn.setRequestMethod("HEAD");

		Map<String, List<String>> headerMap = conn.getHeaderFields();
		Iterator<String> iterator = headerMap.keySet().iterator();
		while (iterator.hasNext()) {
			String key = iterator.next();
			List<String> values = headerMap.get(key);
			
			System.out.println(key + ":" + values.toString());
		}
	}

返回结果：

null:[HTTP/1.1 200 OK]
ETag:["3790915812"]
Date:[Thu, 25 Feb 2010 02:55:40 GMT]
Content-Length:[2095]
Last-Modified:[Thu, 07 Jan 2010 07:48:53 GMT]
Content-Type:[text/html]
Accept-Ranges:[bytes]
Server:[lighttpd/1.4.20]