使用JavaMail对Gmail进行邮件收发

进行JavaMail 收发邮件,必须导入2个Jar包 Mail.Jar Activation.Jar

//利用JavaMail收/发Gmail邮件(SSL) 
//Gmail目前已经启用了POP3和SMTP服务
//与其他邮箱不同的是Gmail提供的POP3和SMTP是使用安全套接字层SSL的，因此常规的JavaMail程序是无法收发邮件的，
//下面是使用JavaMail如何收取Gmail邮件以及发送邮件的代码： 

//1. 邮件收取 
package zjk.javamail;

import java.io.UnsupportedEncodingException;
import java.security.*;
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeUtility;

/**
 * 用于收取Gmail邮件
 * 
 * @author Winter Lau
 */
public class GmailFetch {

    public static void main(String argv[]) throws Exception {

        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";

        // Get a Properties object
        Properties props = System.getProperties();
        props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.pop3.socketFactory.fallback", "false");
        props.setProperty("mail.pop3.port", "995");
        props.setProperty("mail.pop3.socketFactory.port", "995");

        // 以下步骤跟一般的JavaMail操作相同
        Session session = Session.getDefaultInstance(props, null);

        // 请填写你的邮箱帐号和密码
        URLName urln = new URLName("pop3", "pop.gmail.com", 995, null,
                "【你的邮箱账号，如：[email protected]】", "【你的密码】");
        Store store = session.getStore(urln);
        Folder inbox = null;
        try {
            store.connect();
            inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);
            FetchProfile profile = new FetchProfile();
            profile.add(FetchProfile.Item.ENVELOPE);
            Message[] messages = inbox.getMessages();
            inbox.fetch(messages, profile);
            System.out.println("收件箱的邮件数：" + messages.length);
            for (int i = 0; i < messages.length; i++) {
                // 邮件发送者
                String from = decodeText(messages[i].getFrom()[0].toString());
                InternetAddress ia = new InternetAddress(from);
                System.out.println("FROM:" + ia.getPersonal() + '('
                        + ia.getAddress() + ')');
                // 邮件标题
                System.out.println("TITLE:" + messages[i].getSubject());
                // 邮件大小
                System.out.println("SIZE:" + messages[i].getSize());
                // 邮件发送时间
                System.out.println("DATE:" + messages[i].getSentDate());
            }
        } finally {
            try {
                inbox.close(false);
            } catch (Exception e) {
            }
            try {
                store.close();
            } catch (Exception e) {
            }
        }
    }

    protected static String decodeText(String text)
            throws UnsupportedEncodingException {
        if (text == null)
            return null;
        if (text.startsWith("=?GB") || text.startsWith("=?gb"))
            text = MimeUtility.decodeText(text);
        else
            text = new String(text.getBytes("ISO8859_1"));
        return text;
    }

}

//2. 发送邮件 
package zjk.javamail;

import java.security.Security;
import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
 * 使用Gmail发送邮件
 * 
 * @author Winter Lau
 */
public class GmailSender {

    public static void main(String[] args) throws AddressException,
            MessagingException {
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
        // Get a Properties object
        Properties props = System.getProperties();
        props.setProperty("mail.smtp.host", "smtp.gmail.com");
        props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.smtp.socketFactory.fallback", "false");
        props.setProperty("mail.smtp.port", "465");
        props.setProperty("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.auth", "true");
        final String username = "【你的邮箱账号，如：[email protected]】";
        final String password = "【你的密码】";
        Session session = Session.getDefaultInstance(props,
                new Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(username, password);
                    }
                });

        // -- Create a new message --
        Message msg = new MimeMessage(session);

        // -- Set the FROM and TO fields --
        msg.setFrom(new InternetAddress(username));
        msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(
                "【收件人的账号】", false));
        msg.setSubject("Hello");
        msg.setText("How are you");
        msg.setSentDate(new Date());
        Transport.send(msg);

        System.out.println("Message sent.");
    }
}