//
// example of use of java.net.* classes:  copy contents of URL to
//      standard out.
// adapted from example in ch. 12 of _Exploring Java_, Niemeyer & Peck.
//
import java.net.* ;
import java.io.* ;

//
// no constructor or methods; see main method.
//
class ShowURLContents {

        // ---- main --------------------------------------------------
        //
        // command-line argument is URL.
        // program writes contents of URL (assumed to be an ASCII file,
        //      probably HTML) to standard out.
        //
        // examples:
        //      java ShowURLContents 
        //              http://www.cise.ufl.edu/~blm/cis4930
        //      java ShowURLContents http://www.ufl.edu
        //
        public static void main(String[] args) {

                if (args.length < 1) {
                        System.out.println("Argument is URL") ;
                        System.exit(-1) ;
                }

                // create URL object.
                URL u = null ;
                try {
                        u = new URL(args[0]) ;
                } catch (MalformedURLException e) {
                        System.out.println("Bad URL " + args[0]) ;
                        System.out.println("Exception = " + e) ;
                        System.exit(-1) ;
                }

                // open input stream for URL.
                InputStream in = null ;
                try {
                        in = u.openStream() ;
                } catch (IOException e) {
                        System.out.println("Unable to open " +
                                args[0]) ;
                        System.out.println("Exception = " + e) ;
                        System.exit(-1) ;
                }

                // read contents and copy to standard output.
                try {
                        BufferedReader br = 
                                new BufferedReader(
                                        new InputStreamReader(in)) ;
                        System.out.println("Contents of " + 
                                args[0] + ":") ;
                        String line ;
                        while ( (line = br.readLine()) != null) 
                                System.out.println(line) ;
                        br.close() ;
                } catch (IOException e) {
                        System.out.println("I/O error reading " +
                                args[0]) ;
                        System.out.println("Exception = " + e) ;
                        System.exit(-1) ;
                }
        }
}