Java 实例

http://www.runoob.com/java/net-url-header.html

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://www.runoob.com"); 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() ); } }