• 系統要裝能寄信的工具才可

sudo apt-get install sendmail sendmail-bin

• 下載 javamail ; 雖然網站上有寫，但此次不需要 JavaBeans? Activation Framework (JAF)

​http://www.oracle.com/technetwork/java/javamail/index.html

• 解壓縮後，將 javamail.jar 放到 classpath 內

• 可以參考 demo 內的範例寫 java 寄信的 code

package tw.org.nchc.icasIII;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Date;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.Transport;
import javax.mail.URLName;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.util.ByteArrayDataSource;

public class sendhtml {

  public static void main(String[] argv) {
    new sendhtml(argv);
  }

  public sendhtml(String[] argv) {

    String to, subject = null, from = null;
    String cc = null, bcc = null, url = null;
    String mailhost = null;
    String mailer = "sendhtml";
    String protocol = null, host = null, user = null, password = null;
    String record = null; // name of folder in which to record mail
    boolean debug = false;
    
    int optind;
    /*


    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("-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("--")) {
        optind++;
        break;
      } else if (argv[optind].startsWith("-")) {
        System.out
            .println("Usage: sendhtml [[-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] [address]");
        System.exit(1);
      } else {
        break;
      }
    }
    */
    
    to = "waue0920@gmail.com";
    subject = "test, javamail";
    from = "waue0920@nchc.org.tw";
    cc = null;
    bcc = null;
    url = null;
    mailhost = "localhost";
    mailer = "sendhtml";
    protocol = null;
    host = null;
    user = null;
    password = null;
    record = null; // name of folder in which to record mail
    
    try {
      BufferedReader in = new BufferedReader(new FileReader(new File("/home/waue/Desktop/index.html")));
      if (subject == null) {
        System.out.print("Subject: ");
        System.out.flush();
        subject = in.readLine();
      } else {
        System.out.println("Subject: " + subject);
      }

      Properties props = System.getProperties();

      if (mailhost != null)
        props.put("mail.smtp.host", mailhost);

      Session session = Session.getInstance(props, null);
      if (debug)
        session.setDebug(true);

      // construct the message
      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);

      collect(in, msg);

      msg.setHeader("X-Mailer", mailer);
      msg.setSentDate(new Date());

      // send the thing off
      Transport.send(msg);

      System.out.println("\nMail was sent successfully.");

      // Keep a copy, 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) {
      e.printStackTrace();
    }
  }

  public void collect(BufferedReader in, Message msg)
      throws MessagingException, IOException {
    String line;
    String subject = msg.getSubject();
    StringBuffer sb = new StringBuffer();
    sb.append("<HTML>\n");
    sb.append("<HEAD>\n");
    sb.append("<TITLE>\n");
    sb.append(subject + "\n");
    sb.append("</TITLE>\n");
    sb.append("</HEAD>\n");

    sb.append("<BODY>\n");
    sb.append("<H1>" + subject + "</H1>" + "\n");

    while ((line = in.readLine()) != null) {
      sb.append(line);
      sb.append("\n");
    }

    sb.append("</BODY>\n");
    sb.append("</HTML>\n");

    msg.setDataHandler(new DataHandler(new ByteArrayDataSource(sb
        .toString(), "text/html")));
  }
}