Mega Code Archive
How to query the registry for available Providers and set default providers
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/*
* @(#)registry.java 1.9 01/05/23
*
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import java.util.Properties;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Provider;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.NewsAddress;
/**
* This class demonstrates how to query the registry for available Providers,
* set default providers, etc. See section 5.2 in the JavaMail 1.0 Spec for
* details on how to use the registry.
*
* See the comments inline for what's happening.
*
* @author Max Spivak
*/
public class registry {
// let's remember a few providers
static Provider _aProvider, _bProvider, _sunSMTP, _sunIMAP;
public static void main(String[] args) {
Properties props = new Properties();
// set smtp and imap to be our default
// transport and store protocols, respectively
props.put("mail.transport.protocol", "smtp");
props.put("mail.store.protocol", "imap");
//
props.put("mail.smtp.class", "com.sun.mail.smtp.SMTPTransport");
props.put("mail.imap.class", "com.sun.mail.imap.IMAPStore");
Session session = Session.getInstance(props, null);
// session.setDebug(true);
// Retrieve all configured providers from the Session
System.out.println("\n------ getProviders()----------");
Provider[] providers = session.getProviders();
for (int i = 0; i < providers.length; i++) {
System.out.println("** " + providers[i]);
// let's remember some providers so that we can use them later
// (I'm explicitly showing multiple ways of testing Providers)
// BTW, no Provider "ACME Corp" will be found in the default
// setup b/c its not in any javamail.providers resource files
String s = null;
if (((s = providers[i].getVendor()) != null) && s.startsWith("ACME Corp")) {
_aProvider = providers[i];
}
// this Provider won't be found by default either
if (providers[i].getClassName().endsWith("application.smtp"))
_bProvider = providers[i];
// this Provider will be found since com.sun.mail.imap.IMAPStore
// is configured in javamail.default.providers
if (providers[i].getClassName().equals("com.sun.mail.imap.IMAPStore")) {
_sunIMAP = providers[i];
}
// this Provider will be found as well since there is a
// Sun Microsystems SMTP transport configured by
// default in javamail.default.providers
if (((s = providers[i].getVendor()) != null) && s.startsWith("Sun Microsystems")
&& providers[i].getType() == Provider.Type.TRANSPORT
&& providers[i].getProtocol().equalsIgnoreCase("smtp")) {
_sunSMTP = providers[i];
}
}
System.out.println("\n------ initial protocol defaults -------");
try {
System.out.println("imap: " + session.getProvider("imap"));
System.out.println("smtp: " + session.getProvider("smtp"));
// the NNTP provider will fail since we don't have one configured
System.out.println("nntp: " + session.getProvider("nntp"));
} catch (NoSuchProviderException mex) {
System.out
.println(">> This exception is OK since there is no NNTP Provider configured by default");
mex.printStackTrace();
}
System.out.println("\n------ set new protocol defaults ------");
// set some new defaults
try {
// since _aProvider isn't configured, this will fail
session.setProvider(_aProvider); // will fail
} catch (NoSuchProviderException mex) {
System.out.println(">> Exception expected: _aProvider is null");
mex.printStackTrace();
}
try {
// _sunIMAP provider should've configured correctly; should work
session.setProvider(_sunIMAP);
} catch (NoSuchProviderException mex) {
mex.printStackTrace();
}
try {
System.out.println("imap: " + session.getProvider("imap"));
System.out.println("smtp: " + session.getProvider("smtp"));
} catch (NoSuchProviderException mex) {
mex.printStackTrace();
}
System.out.println("\n\n----- get some stores ---------");
// multiple ways to retrieve stores. these will print out the
// string "imap:" since its the URLName for the store
try {
System.out.println("getStore(): " + session.getStore());
System.out.println("getStore(Provider): " + session.getStore(_sunIMAP));
} catch (NoSuchProviderException mex) {
mex.printStackTrace();
}
try {
System.out.println("getStore(imap): " + session.getStore("imap"));
// pop3 will fail since it doesn't exist
System.out.println("getStore(pop3): " + session.getStore("pop3"));
} catch (NoSuchProviderException mex) {
System.out.println(">> Exception expected: no pop3 provider");
mex.printStackTrace();
}
System.out.println("\n\n----- now for transports/addresses ---------");
// retrieve transports; these will print out "smtp:" (like stores did)
try {
System.out.println("getTransport(): " + session.getTransport());
System.out.println("getTransport(Provider): " + session.getTransport(_sunSMTP));
System.out.println("getTransport(smtp): " + session.getTransport("smtp"));
System.out.println("getTransport(Address): "
+ session.getTransport(new InternetAddress("mspivak@apilon")));
// News will fail since there's no news provider configured
System.out.println("getTransport(News): "
+ session.getTransport(new NewsAddress("rec.humor")));
} catch (MessagingException mex) {
System.out.println(">> Exception expected: no news provider configured");
mex.printStackTrace();
}
}
}
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