JavaME and Http.

I'm trying to use Java Me ,
My first simple app would connect to a webpage and show html code in a
textbox.
I use code that i found in javax.microedition.io.Httpconnection,but I have
some error.
here is function :

 void getViaHttpConnection(String url) throws IOException {
         HttpConnection c = null;
         InputStream is = null;
         int rc;

         try {
             c = (HttpConnection)Connector.open(url);

             // Getting the response code will open the connection,
             // send the request, and read the HTTP response headers.
             // The headers are stored until requested.
             rc = c.getResponseCode();
             if (rc != HttpConnection.HTTP_OK) {
                 throw new IOException("HTTP response code: " + rc);
             }

             is = c.openInputStream();

             // Get the ContentType
             String type = c.getType();

             // Get the length and process the data
             int len = (int)c.getLength();
             if (len > 0) {
                 int actual = 0;
                 int bytesread = 0 ;
                 byte[] data = new byte[len];
                 while ((bytesread != len) && (actual != -1)) {
                    actual = is.read(data, bytesread, len - bytesread);
                    bytesread += actual;
                 }
             } else {
                 int ch;
                 while ((ch = is.read()) != -1) {
                                   }
             }
         } catch (ClassCastException e) {
             throw new IllegalArgumentException("Not an HTTP URL");
         } finally {
             if (is != null)
                 is.close();
             if (c != null)
                 c.close();
         }
     }

I call function with a button click:

public void commandAction(Command command,
Displayable displayable) { // Insert global
pre-action code here if (displayable == helloForm)
{ if (command == exitCommand)
{ // Insert pre-action code here
exitMIDlet(); // Insert post-action
code here } else if (command == itemCommand1)
{ // Insert pre-action code here
getViaHttpConnection("www.libero.it"); }
     } }
When I build ,I have this error:

 \myapp\src\HelloMidlet.java:102: unreported exception java.io.IOException;
must be caught or declared to be thrown
getViaHttpConnection("www.libero.it");

1 error\myapp\nbproject\build-impl.xml:183: Compile failed; see the compiler
error output for details.BUILD FAILED (total time: 1 second)
Suggestion?
What is step by step procedure?
thanks,Mike.