March 2005
Beginner to intermediate
1254 pages
104h 21m
English
Content preview from Java in a Nutshell, 5th Edition
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Name
HttpURLConnection
Synopsis
This class is a specialization of
URLConnection. An instance of this class is
returned when the openConnection( ) method is
called for a URL object that uses the HTTP
protocol. The many
constants
defined by this class are the status codes returned by HTTP servers.
setRequestMethod(
)
specifies what kind of HTTP request is made.
The contents of this request must be sent through the
OutputStream returned by the
getOutputStream(
)
method of the superclass. Once an HTTP
request has been sent, getResponseCode(
)
returns the HTTP server’s
response code as an integer, and getResponseMessage(
)
returns the server’s
response message. The disconnect(
)
method closes the connection. The static setFollowRedirects(
) specifies whether URL connections that use the HTTP
protocol should automatically follow redirect responses sent by HTTP
servers. In order to successfully use this class, you need to
understand the details of the HTTP protocol.
Figure 12-5. java.net.HttpURLConnection
public abstract class HttpURLConnection extends URLConnection { // Protected Constructors protected HttpURLConnection(URL u); // Public Constants public static final int HTTP_ACCEPTED; =202 public static final int HTTP_BAD_GATEWAY; =502 public static final int HTTP_BAD_METHOD; =405 public static final int HTTP_BAD_REQUEST; =400 public static final int HTTP_CLIENT_TIMEOUT; =408
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