Interacting with Networks and Databases - Beginning Java 7 - page 823

URL url = new URL("http://tutortutor.ca");
}
catch (MalformedURLException murle)
{
}
This example creates a URL object that uses HTTP to access the web page at ht-
tp://tutortutor.ca . If I specified an illegal URL (e.g., foo ), the constructor
would throw java.net.MalformedURLException (an IOException sub-
class).
Although you'll commonly specify http:// as the protocol prefix, this isn't your
only choice. For example, you can also specify file:/// when the resource is
located on the local host. Furthermore, you can prepend jar: to either http:// or
file:/// when the resource is stored in a JAR file, as demonstrated here:
jar:file:///C:./rt.jar!/com/sun/beans/TypeResolver.class
The jar: prefixindicatesthatyouwanttoaccessaJARfileresource(e.g.,astored
classfile). The file:/// prefix identifies the local host's resource location, which
happenstobe rt.jar (Java7'sruntimeJARfile)inthecurrentdirectoryontheWin-
dows C: hard drive in this example.
ThepathtotheJARfileisfollowedbyanexclamationmark(!)toseparatetheJAR
file path from the JAR resource path, which happens to be the /com/sun/beans/
TypeResolver.class classfileentryinthisJARfile(theleading / characterisre-
quired).
Note The URL classinOracle'sJavareferenceimplementationsupportsadditional
protocols, including ftp and mailto .
Aftercreatinga URL object,youcaninvokevarious URL methodstoaccessportions
oftheURL.Forexample, String getProtocol() returnstheprotocolportionof
theURL(e.g., http ).Youcanalsoretrievetheresourcebycallingthe InputStream
openStream() method.
openStream() createsaconnectiontotheresourceandreturnsan InputStream
instance for reading resource data from that connection, as demonstrated here:
try (InputStream is = url.openStream())
{
int ch;
while ((ch = is.read()) != -1)