HELP! * GREY=local LOCAL HTML version of Foils prepared 29 January 1996

Foil 110 Accessing URL's in Java -- URLConnection

From CPS616 Lectures on Java CPS616 Basic Information Track for Computational Science -- Winter-Spring Semester 96. by Geoffrey C. Fox * See also color IMAGE

More interesting is to access a URL and process the information there!
This is done using a stdio like stream (generalizes pipe) which is supported in java.io package with usual buffering capabilities
There are methods in class URL -- InputStream in = url.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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