WWW ja Java

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Home > List of Packages > java.net [27 examples] > HTTP [4 examples]

e140. Getting the Response Headers from an HTTP Connection

try {
// Create a URLConnection object for a URL
URL url = new URL("http://hostname:80");
URLConnection conn = url.openConnection();

// List all the response headers from the server.
// Note: The first call to getHeaderFieldKey() will implicit send
// the HTTP request to the server.
for (int i=0; ; i ) {
String headerName = conn.getHeaderFieldKey(i);
String headerValue = conn.getHeaderField(i);

if (headerName == null && headerValue == null) {
// No more headers
break;
}
if (headerName == null) {
// The header value contains the server's HTTP version
}
}
} catch (Exception e) {
}

Here's a sample of headers from a website:

Key=Value

null=HTTP/1.1 200 OK
Server=Netscape-Enterprise/4.1
Date=Mon, 11 Feb 2002 09:23:26 GMT
Cache-control=public
Content-type=text/html
Etag="9fa67d2a-58-71-3bbdad3283"
Last-modified=Fri, 05 Oct 2001 12:53:06 GMT
Content-length=115
Accept-ranges=bytes
Connection=close