Basic HTML version of Foils prepared May 12 1996

Foil 127 Accessing URL's in Java -- URLConnection

From CRPC Lectures on Java Language Applets Graphics CRPC Annual Meeting Tutorial -- May 14,1996. by Geoffrey C. Fox
1 More interesting is to access a URL and process the information there!
2 This is done using a stdio like stream (generalizes pipe) which is supported in java.io package with usual buffering capabilities
3 There are methods in class URL -- InputStream in = instanceofURL.openStream(); // opens an InputStream associated with given url
4 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
5 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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