JavaMail实践--实现邮件发送

import java.util.Properties;
import java.util.Scanner;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.*;

public class EMailDemo {

    public static void main(String[] args) {
        // EMailDemo.sendEmail();
        // EMailDemo.sendHtml(EMailDemo.getSession());
        EMailDemo.sendWithFile(getSession());
    }

    private static String to = null;
    private static String from = null;
    private static Scanner sc = new Scanner(System.in);

    private static Session getSession() {
        System.out.println("请输入收件人邮箱（任意）：");
        String to = sc.nextLine();// 收件人
        System.out.println("请输入发件人邮箱（QQ）：");
        String from = sc.nextLine();// 发件人
        System.out.println("请输入发件人邮箱的授权码：");
        String pop3 = sc.nextLine();// 发件人
        String host = "smtp.qq.com";// 指定发送邮件的QQ主机
        Properties properties = System.getProperties(); // 获取系统属性
        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", host);
        properties.put("mail.smtp.auth", "true");
        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(from, pop3); // 发件人邮件用户名、授权码
            }
        });
        return session;
    }

    public static void sendEmail(Session session) {
        try {
            // 创建默认的 MimeMessage 对象
            MimeMessage message = new MimeMessage(session);
            // Set From: 头部头字段
            message.setFrom(new InternetAddress(from));
            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            // Set Subject: 头部头字段
            System.out.println("请设置邮件标题：");
            message.setSubject(sc.nextLine());
            // 设置消息体
            System.out.println("请设置邮件内容：");
            message.setText(sc.nextLine());
            // 发送消息
            Transport.send(message);
            System.out.println("Sent message successfully....");
        } catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }

    public static void sendHtml(Session session) {
        try {
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            System.out.println("请设置邮件标题：");
            message.setSubject(sc.nextLine());
            // 发送 HTML 消息, 可以插入html标签
            System.out.println("请设置邮件内容(可以插入html标签)：");
            message.setContent(sc.nextLine(), "text/html");
            Transport.send(message);
            System.out.println("Sent message successfully....");
        } catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }

    public static void sendWithFile(Session session) {
        try {
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            System.out.println("请设置邮件标题：");
            message.setSubject(sc.nextLine());

            // 创建消息部分
            BodyPart messageBodyPart = new MimeBodyPart();
            // 消息
            System.out.println("请设置邮件内容：");
            message.setText(sc.nextLine());
            // 创建多重消息
            Multipart multipart = new MimeMultipart();
            // 设置文本消息部分
            multipart.addBodyPart(messageBodyPart);
            // 附件部分
            messageBodyPart = new MimeBodyPart();
            System.out.println("请输入文件完整路径：");
            String filename = sc.nextLine();
            DataSource source = new FileDataSource(filename);
            messageBodyPart.setDataHandler(new DataHandler(source));
            messageBodyPart.setFileName(filename);
            multipart.addBodyPart(messageBodyPart);
            // 发送完整消息
            message.setContent(multipart);

            Transport.send(message);
            System.out.println("Sent message successfully....");
        } catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }
}