以下实例演示了如何获取指定 URL 的响应头信息:
import java.io.IOException; import java.net.URL; import java.net.URLConnection; import java.util.Map; import java.util.Set; public class Main { public static void main(String[] args) throws IOException{ URL url = new URL("http://edu.jb51.net"); URLConnection conn = url.openConnection(); Map headers = conn.getHeaderFields(); Set<String> keys = headers.keySet(); for( String key : keys ){ String val = conn.getHeaderField(key); System.out.println(key+" "+val); } System.out.println( conn.getLastModified() ); } }
以上代码运行输出结果为:
Transfer-Encoding chunked null HTTP/1.1 200 OK Server Tengine/1.3.0 Connection keep-alive Vary Cookie Date Mon, 04 May 2015 03:54:05 GMT X-Pingback http://edu.jb51.net/xmlrpc.php X-Powered-By PHP/5.3.15 Content-Type text/html; charset=UTF-8