Java Reference
In-Depth Information
Example 7-1
is a simple example program that follows the basic pattern of the last
several mail-reading programs. However, this one no longer uses
writeTo()
. Instead,
it uses the methods in this section to print just the headers. Furthermore, it prints them
in a particular order regardless of their order in the actual message on the server. Finally,
it ignores the less important headers such as X-UIDL: and Status:. The static
InternetAddress.toString()
method converts the arrays that most of these methods
return into simple, comma-separated strings.
Example 7-1. A program to read mail headers
import
javax.mail.*
;
import
javax.mail.internet.*
;
import
java.util.*
;
public
class
HeaderClient
{
public
static
void
main
(
String
[]
args
)
{
if
(
args
.
length
==
0
)
{
System
.
err
.
println
(
"Usage: java HeaderClient protocol://username@host/foldername"
);
return
;
}
URLName
server
=
new
URLName
(
args
[
0
]);
try
{
Session
session
=
Session
.
getInstance
(
new
Properties
(),
new
MailAuthenticator
(
server
.
getUsername
()));
// Connect to the server and open the folder
Folder
folder
=
session
.
getFolder
(
server
);
if
(
folder
==
null
)
{
System
.
out
.
println
(
"Folder "
+
server
.
getFile
()
+
" not found."
);
System
.
exit
(
1
);
}
folder
.
open
(
Folder
.
READ_ONLY
);
// Get the messages from the server
Message
[]
messages
=
folder
.
getMessages
();
for
(
int
i
=
0
;
i
<
messages
.
length
;
i
++)
{
System
.
out
.
println
(
"------------ Message "
+
(
i
+
1
)
+
" ------------"
);
// Here's the big change...
String
from
=
InternetAddress
.
toString
(
messages
[
i
].
getFrom
());
if
(
from
!=
null
)
System
.
out
.
println
(
"From: "
+
from
);
String
replyTo
=
InternetAddress
.
toString
(
messages
[
i
].
getReplyTo
());
if
(
replyTo
!=
null
)
System
.
out
.
println
(
"Reply-to: "
+
replyTo
);
String
to
=
InternetAddress
.
toString
(
messages
[
i
].
getRecipients
(
Message
.
RecipientType
.
TO
));
