.... URL url=new URL(urlString);
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(4*1000);
Map<String, List<String>> headerFields = conn.getHeaderFields();
Set<Entry<String, List<String>>> entrySet = headerFields.entrySet();
Iterator<Entry<String, List<String>>> iterator = entrySet.iterator();
while(iterator.hasNext()) {
Entry<String, List<String>> next = iterator.next();
String key=next.getKey();
List<String> value = next.getValue();
if(key==null)
System.out.println(value.toString());
else
System.out.println(key+":"+value.toString());
}
……
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