Basic HTML version of Foils prepared 18 May 97

Foil 33 Accessing URL's in Java -- URLConnection

From Java Tutorial - Spring 1997 Part 4: Multithreading, useful Java classes, I/O, Networking, and the future Peking Tutorial, Web Certificate -- Spring-Summer 1997. by Nancy J. McCracken,Geoffrey C. Fox


More interesting is to access a URL and process the information there!
This is done using streams:
There are methods in class URL --
InputStream in = instanceofURL.openStream(); // opens an InputStream associated with given url
More general is instanceofURL.openConnection() establishes a general connection and returns an instance of class URLConnection
  • This provides most general HTTP connectivity and indeed has some advantages over sockets as these are subject to special security restrictions in Netscape's current implementation
Note that one can connect not just to HTML files but also to CGI scripts i.e. programs at server and so obtain flexible connectivity



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