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Listing 8 - The program named Java4640a.
/*File Java4640a.java Copyright 1998, R.G.Baldwin Revised 01/05/14
This program exercises four of the constructors andsix of the methods of the URL class.
The program also illustrates the use of the URLEncoderclass to convert a string containing spaces and other
such characters into UTF-8 format.**********************************************************/
import java.net.*;import java.io.*;
class Java4640a{public static void main(String[] args){Java4640a obj = new Java4640a();
try{System.out.println(
"Use simple string constructor for host URL");obj.display(new URL("http://www.austincc.edu"));System.out.println("Use simple string constructor " +
"for host plus file");obj.display(new URL(
"http://www.austincc.edu/baldwin"));System.out.println("Use strings for protocol, host, and file");
obj.display(new URL("http","www.austincc.edu","/baldwin"));System.out.println("Use strings for protocol " +
"host, and file\n and int for port");obj.display(new URL(
"http","www.austincc.edu",80,"/baldwin"));System.out.println("Construct absolute URL from " +"host URL and relative URL");
URL baseURL = new URL("http://www.austincc.edu/baldwin/hello.html");
obj.display(new URL(baseURL,"/baldwin/Index.html"));System.out.println("Now use URLEncoder to create " +"UTF-8 encoded String");
System.out.println("http://space .tilde~.plus+.com");System.out.println(URLEncoder.encode(
"http://space .tilde~.plus+.com","UTF-8"));}catch(MalformedURLException |
UnsupportedEncodingException e){e.printStackTrace();
}//end catch}//end main
//-----------------------------------------------------//void display(URL url){//method to display parts of URLSystem.out.print(url.getProtocol() + " ");
System.out.print(url.getHost() + " ");System.out.print(url.getPort() + " ");
System.out.print(url.getFile() + " ");System.out.println(url.getRef());//Now display entire URL as a string.
System.out.println(url.toString());System.out.println();
}//end display}//end class Java4640a
| Listing 9 - The program named Java4640d. |
|---|
/*File Java4640d.java Copyright 1998, R.G.Baldwin Revised 01/06/14
Illustrates connecting to a URL and reading a file fromthat URL as an input stream.
Computer must be online for this program to run properly.Otherwise, it will throw an exception of type
UnknownHostException.**********************************************************/
import java.net.*;import java.io.*;
class Java4640d{public static void main(String[] args){String dataLine;
try{//Get a URL object
URL url = new URL("http://www.austincc.edu/baldwin/page1.html");//Open a connection to this URL and return an
// input stream for reading from the connection.BufferedReader htmlPage =
new BufferedReader(new InputStreamReader(url.openStream()));//Read and display file one line at a time.
while((dataLine = htmlPage.readLine()) != null){System.out.println(dataLine);
}//end while loop}//end try
catch(Exception e){e.printStackTrace();
}//end catch}//end main
}//end class Java4640d |
-end-
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