Java Reference
In-Depth Information
Example 5-4. The parts of a URL
import
java.net.*
;
public
class
URLSplitter
{
public
static
void
main
(
String
args
[])
{
for
(
int
i
=
0
;
i
<
args
.
length
;
i
++)
{
try
{
URL
u
=
new
URL
(
args
[
i
]);
System
.
out
.
println
(
"The URL is "
+
u
);
System
.
out
.
println
(
"The scheme is "
+
u
.
getProtocol
());
System
.
out
.
println
(
"The user info is "
+
u
.
getUserInfo
());
String
host
=
u
.
getHost
();
if
(
host
!=
null
)
{
int
atSign
=
host
.
indexOf
(
'@'
);
if
(
atSign
!=
-
1
)
host
=
host
.
substring
(
atSign
+
1
);
System
.
out
.
println
(
"The host is "
+
host
);
}
else
{
System
.
out
.
println
(
"The host is null."
);
}
System
.
out
.
println
(
"The port is "
+
u
.
getPort
());
System
.
out
.
println
(
"The path is "
+
u
.
getPath
());
System
.
out
.
println
(
"The ref is "
+
u
.
getRef
());
System
.
out
.
println
(
"The query string is "
+
u
.
getQuery
());
}
catch
(
MalformedURLException
ex
)
{
System
.
err
.
println
(
args
[
i
]
+
" is not a URL I understand."
);
}
System
.
out
.
println
();
}
}
}
Here's the result of running this against several of the URL examples in this chapter:
%
java
URLSplitter
\
ftp:
//mp3:mp3@138.247.121.61:21000/c%3a/ \
http:
//www.oreilly.com \
http:
//www.ibiblio.org/nywc/compositions.phtml?category=Piano \
http:
//admin@www.blackstar.com:8080/ \
The
URL
is
ftp:
//mp3:mp3@138.247.121.61:21000/c%3a/
The
scheme
is
ftp
The
user
info
is
mp3:
mp3
The
host
is
138.247
.
121.61
The
port
is
21000
The
path
is
/
c
%
3
a
/
The
ref
is
null
The
query
string
is
null
