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| Tips & Tricks |
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starting from “http://” otherwise it sends an
error message indicating invalid url.
ViewSource.java
import java.io.*;
import java.net.*;
public class ViewSource {
public static void main (String[] args) throws
IOException{
System.out.print(“Enter url to view html
source code:”);
BufferedReader br = new
BufferedReader(new
InputStreamReader(System.in));
String url = br.readLine();
try{
URL u = new URL(url);
HttpURLConnection uc =
(HttpURLConnection) u.openConnection();
int code = uc.getResponseCode();
String response =
uc.getResponseMessage();
System.out.println(“HTTP/1.x “ + code +
“ “ + response);
for(int j = 1; ; j++){
String header = uc.getHeaderField(j);
String key = uc.getHeaderFieldKey(j);
if(header == null || key == null)
break;
System.out.println(uc.getHeaderFieldKey(j)
+ “: “ + header);
}
InputStream in = new
BufferedInputStream(uc.getInputStream());
Reader r = new InputStreamReader(in);
int c;
while((c = r.read()) != -1){
System.out.print((char)c);
}
}
catch(MalformedURLException ex){
System.err.println(url + “ is not a valid
URL.”);
}
catch(IOException ie){
System.out.println(“Input/Output Error: “
+ ie.getMessage());
}
}
}
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In the program, HttpURLConnection is the
abstract class of the java.net package. This class
extends the URLConnection class of the java.net
package and facilitates all same facilities of the
URLConnection class with the specific HTTP
features specially. getResponseCode() method
of the HttpURLConnection class returns an
integer value which is the code for the status
from the http response message.
getResponseMethod() method of the
HttpURLConnection class shows the message
with the http response code from the server.
getHeaderFieldKey(int j) method returns the key
for the given jth header field.
Output of the program:
C:\JavaJazzUp>java ViewSource
Enter url of local for viewing html source
code: http://localhost:8080/JJU/index
.jsp
HTTP/1.x 200 OK
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=
CC15E9CA0342CB43B2E2A3352E657528;
Path=/JJU
Content-Type: text/html;charset=ISO-8859-
1
Content-Length: 205
Date: Tue, 08 Jan 2008 05:59:07 GMT
<!DOCTYPE html PUBLIC “-//W3C//DTD
XHTML 1.0 Transitional//EN”
“http://www.w3.org/TR/xhtml1/DTD/
xhtml1-transitional.dtd”
>
<html>
<head>
<title>Index</title>
</head>
<body>
Hello........
</body>
</html>
3. Showing digital clock in Applet
This is an example of applet showing current
time as in digital clock. This type of program is
used to display the time on browser where your
application is running.
In this example the time will be displayed in an
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Feb
2008 | Java Jazz Up | 64 |
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