Javamail实现邮件发送

想为游戏服务器添加一个自动报警功能，所以需要发送邮件，直接下载了Javamail，里面的例子可以直接使用，下面说明一下使用方法。

/*
 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.Properties;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.SendFailedException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.URLName;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import com.sun.mail.smtp.SMTPAddressFailedException;
import com.sun.mail.smtp.SMTPAddressSucceededException;
import com.sun.mail.smtp.SMTPSendFailedException;
import com.sun.mail.smtp.SMTPTransport;
/**
 * Demo app that shows how to construct and send an RFC822 (singlepart) message.
 * 
 * XXX - allow more than one recipient on the command line
 * 
 * This is just a variant of msgsend.java that demonstrates use of some
 * SMTP-specific features.
 * 
 * @author Max Spivak
 * @author Bill Shannon
 */
public class smtpsend {
	/**
	 * Example of how to extend the SMTPTransport class. This example
	 * illustrates how to issue the XACT command before the SMTPTransport issues
	 * the DATA command.
	 * 
	 * public static class SMTPExtension extends SMTPTransport { public
	 * SMTPExtension(Session session, URLName url) { super(session, url); // to
	 * check that we're being used
	 * System.out.println("SMTPExtension: constructed"); }
	 * 
	 * protected synchronized OutputStream data() throws MessagingException { if
	 * (supportsExtension("XACCOUNTING")) issueCommand("XACT", 250); return
	 * super.data(); } }
	 */
	public static void main(String[] argv) {
		String to, subject = null, from = null, cc = null, bcc = null, url = null;
		String mailhost = null;
		String mailer = "smtpsend";
		String file = null;
		String protocol = null, host = null, user = null, password = null;
		String record = null; // name of folder in which to record mail
		boolean debug = false;
		boolean verbose = false;
		boolean auth = false;
		String prot = "smtp";
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		int optind;
		/*
		 * Process command line arguments.
		 */
		for (optind = 0; optind < argv.length; optind++) {
			if (argv[optind].equals("-T")) {
				protocol = argv[++optind];
			} else if (argv[optind].equals("-H")) {
				host = argv[++optind];
			} else if (argv[optind].equals("-U")) {
				user = argv[++optind];
			} else if (argv[optind].equals("-P")) {
				password = argv[++optind];
			} else if (argv[optind].equals("-M")) {
				mailhost = argv[++optind];
			} else if (argv[optind].equals("-f")) {
				record = argv[++optind];
			} else if (argv[optind].equals("-a")) {
				file = argv[++optind];
			} else if (argv[optind].equals("-s")) {
				subject = argv[++optind];
			} else if (argv[optind].equals("-o")) { // originator
				from = argv[++optind];
			} else if (argv[optind].equals("-c")) {
				cc = argv[++optind];
			} else if (argv[optind].equals("-b")) {
				bcc = argv[++optind];
			} else if (argv[optind].equals("-L")) {
				url = argv[++optind];
			} else if (argv[optind].equals("-d")) {
				debug = true;
			} else if (argv[optind].equals("-v")) {
				verbose = true;
			} else if (argv[optind].equals("-A")) {
				auth = true;
			} else if (argv[optind].equals("-S")) {
				prot = "smtps";
			} else if (argv[optind].equals("--")) {
				optind++;
				break;
			} else if (argv[optind].startsWith("-")) {
				System.out
						.println("Usage: smtpsend [[-L store-url] | [-T prot] [-H host] [-U user] [-P passwd]]");
				System.out
						.println("/t[-s subject] [-o from-address] [-c cc-addresses] [-b bcc-addresses]");
				System.out
						.println("/t[-f record-mailbox] [-M transport-host] [-d] [-a attach-file]");
				System.out.println("/t[-v] [-A] [-S] [address]");
				System.exit(1);
			} else {
				break;
			}
		}
		try {
			/*
			 * Prompt for To and Subject, if not specified.
			 */
			if (optind < argv.length) {
				// XXX - concatenate all remaining arguments
				to = argv[optind];
				System.out.println("To: " + to);
			} else {
				System.out.print("To: ");
				System.out.flush();
				to = in.readLine();
			}
			if (subject == null) {
				System.out.print("Subject: ");
				System.out.flush();
				subject = in.readLine();
			} else {
				System.out.println("Subject: " + subject);
			}
			/*
			 * Initialize the JavaMail Session.
			 */
			Properties props = System.getProperties();
			if (mailhost != null)
				props.put("mail." + prot + ".host", mailhost);
			if (auth)
				props.put("mail." + prot + ".auth", "true");
			/*
			 * Create a Provider representing our extended SMTP transport and
			 * set the property to use our provider.
			 * 
			 * Provider p = new Provider(Provider.Type.TRANSPORT, prot,
			 * "smtpsend$SMTPExtension", "JavaMail demo", "no version");
			 * props.put("mail." + prot + ".class", "smtpsend$SMTPExtension");
			 */
			// Get a Session object
			Session session = Session.getInstance(props, null);
			if (debug)
				session.setDebug(true);
			/*
			 * Register our extended SMTP transport.
			 * 
			 * session.addProvider(p);
			 */
			/*
			 * Construct the message and send it.
			 */
			Message msg = new MimeMessage(session);
			if (from != null)
				msg.setFrom(new InternetAddress(from));
			else
				msg.setFrom();
			msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(
					to, false));
			if (cc != null)
				msg.setRecipients(Message.RecipientType.CC, InternetAddress
						.parse(cc, false));
			if (bcc != null)
				msg.setRecipients(Message.RecipientType.BCC, InternetAddress
						.parse(bcc, false));
			msg.setSubject(subject);
			String text = collect(in);
			if (file != null) {
				// Attach the specified file.
				// We need a multipart message to hold the attachment.
				MimeBodyPart mbp1 = new MimeBodyPart();
				mbp1.setText(text);
				MimeBodyPart mbp2 = new MimeBodyPart();
				mbp2.attachFile(file);
				MimeMultipart mp = new MimeMultipart();
				mp.addBodyPart(mbp1);
				mp.addBodyPart(mbp2);
				msg.setContent(mp);
			} else {
				// If the desired charset is known, you can use
				// setText(text, charset)
				msg.setText(text);
			}
			msg.setHeader("X-Mailer", mailer);
			msg.setSentDate(new Date());
			// send the thing off
			/*
			 * The simple way to send a message is this:
			 * 
			 * Transport.send(msg);
			 * 
			 * But we're going to use some SMTP-specific features for
			 * demonstration purposes so we need to manage the Transport object
			 * explicitly.
			 */
			SMTPTransport t = (SMTPTransport) session.getTransport(prot);
			try {
				if (auth)
					t.connect(mailhost, user, password);
				else
					t.connect();
				t.sendMessage(msg, msg.getAllRecipients());
			} finally {
				if (verbose)
					System.out
							.println("Response: " + t.getLastServerResponse());
				t.close();
			}
			System.out.println("/nMail was sent successfully.");
			/*
			 * Save a copy of the message, if requested.
			 */
			if (record != null) {
				// Get a Store object
				Store store = null;
				if (url != null) {
					URLName urln = new URLName(url);
					store = session.getStore(urln);
					store.connect();
				} else {
					if (protocol != null)
						store = session.getStore(protocol);
					else
						store = session.getStore();
					// Connect
					if (host != null || user != null || password != null)
						store.connect(host, user, password);
					else
						store.connect();
				}
				// Get record Folder. Create if it does not exist.
				Folder folder = store.getFolder(record);
				if (folder == null) {
					System.err.println("Can't get record folder.");
					System.exit(1);
				}
				if (!folder.exists())
					folder.create(Folder.HOLDS_MESSAGES);
				Message[] msgs = new Message[1];
				msgs[0] = msg;
				folder.appendMessages(msgs);
				System.out.println("Mail was recorded successfully.");
			}
		} catch (Exception e) {
			/*
			 * Handle SMTP-specific exceptions.
			 */
			if (e instanceof SendFailedException) {
				MessagingException sfe = (MessagingException) e;
				if (sfe instanceof SMTPSendFailedException) {
					SMTPSendFailedException ssfe = (SMTPSendFailedException) sfe;
					System.out.println("SMTP SEND FAILED:");
					if (verbose)
						System.out.println(ssfe.toString());
					System.out.println("  Command: " + ssfe.getCommand());
					System.out.println("  RetCode: " + ssfe.getReturnCode());
					System.out.println("  Response: " + ssfe.getMessage());
				} else {
					if (verbose)
						System.out.println("Send failed: " + sfe.toString());
				}
				Exception ne;
				while ((ne = sfe.getNextException()) != null
						&& ne instanceof MessagingException) {
					sfe = (MessagingException) ne;
					if (sfe instanceof SMTPAddressFailedException) {
						SMTPAddressFailedException ssfe = (SMTPAddressFailedException) sfe;
						System.out.println("ADDRESS FAILED:");
						if (verbose)
							System.out.println(ssfe.toString());
						System.out.println("  Address: " + ssfe.getAddress());
						System.out.println("  Command: " + ssfe.getCommand());
						System.out
								.println("  RetCode: " + ssfe.getReturnCode());
						System.out.println("  Response: " + ssfe.getMessage());
					} else if (sfe instanceof SMTPAddressSucceededException) {
						System.out.println("ADDRESS SUCCEEDED:");
						SMTPAddressSucceededException ssfe = (SMTPAddressSucceededException) sfe;
						if (verbose)
							System.out.println(ssfe.toString());
						System.out.println("  Address: " + ssfe.getAddress());
						System.out.println("  Command: " + ssfe.getCommand());
						System.out
								.println("  RetCode: " + ssfe.getReturnCode());
						System.out.println("  Response: " + ssfe.getMessage());
					}
				}
			} else {
				System.out.println("Got Exception: " + e);
				if (verbose)
					e.printStackTrace();
			}
		}
	}
	/**
	 * Read the body of the message until EOF.
	 */
	public static String collect(BufferedReader in) throws IOException {
		String line;
		StringBuffer sb = new StringBuffer();
		while ((line = in.readLine()) != null) {
			sb.append(line);
			sb.append("/n");
		}
		return sb.toString();
	}
}

在调试的时候，需要配置一下邮件发送的必要参数，如图：

-M 是用于指定邮件发送用的smtp服务器，之后的-o就是我们自己的邮箱，因为服务器必须知道是哪个邮箱要发送邮件，-U和-P代表的就是用户名密码，-A是告诉程序我们需要使用身份验证功能。OK，接下来 Debug As -> Java Application 就可以了！

PS：程序执行过程中需要询问发送到哪个邮箱，邮件标题和邮件正文是什么，在输入邮件主题后按回车，这时就进入正文输入环节，这个地方不会自动判断输入完毕，需要使用Ctrl+D来终止输入，之后程序才会执行邮件发送。