Java实现发邮件功能

Posted 2020-08-04 家国之恋

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代码如下:

package com.weimob.finance.utils;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.List;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

/**
* Java Mail 工具类
*
* @author XueQi
* @version 1.0
*
*/
public class MailUtils {
    private static String host;
    private static String username;
    private static String password;
    private static String from;
    private static String nick;

    static {
        try {
            // Test Data
            host = "smtp.qq.com";
            username = "[email protected]";
            password = "*******";
            from = "[email protected]";
            nick = "nickinfo";
            // nick + from 组成邮箱的发件人信息
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 发送邮件
     *
     * @param to
     *            收件人列表，以","分割
     * @param subject
     *            标题
     * @param body
     *            内容
     * @param filepath
     *            附件列表,无附件传递null
     * @return
     * @throws MessagingException
     * @throws AddressException
     * @throws UnsupportedEncodingException
     */
    public static boolean sendMail(String to, String subject, String body,
            List<String> filepath) throws AddressException, MessagingException,
            UnsupportedEncodingException {
        // 参数修饰
        if (body == null) {
            body = "";
        }
        if (subject == null) {
            subject = "无主题";
        }
        // 创建Properties对象
        Properties props = System.getProperties();
        // 创建信件服务器
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.auth", "true"); // 通过验证
        props.put("mail.smtp.port", "465");
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.ssl.enable", "true");
       //props.put("mail.debug", "true");
        // 得到默认的对话对象
        Session session = Session.getDefaultInstance(props, null);
        // 创建一个消息，并初始化该消息的各项元素
        MimeMessage msg = new MimeMessage(session);
        nick = MimeUtility.encodeText(nick);
        msg.setFrom(new InternetAddress(nick + "<" + from + ">"));
        // 创建收件人列表
        if (to != null && to.trim().length() > 0) {
            String[] arr = to.split(",");
            int receiverCount = arr.length;
            if (receiverCount > 0) {
                InternetAddress[] address = new InternetAddress[receiverCount];
                for (int i = 0; i < receiverCount; i++) {
                    address[i] = new InternetAddress(arr[i]);
                }
                msg.addRecipients(Message.RecipientType.TO, address);
                msg.setSubject(subject);
                // 后面的BodyPart将加入到此处创建的Multipart中
                Multipart mp = new MimeMultipart();
                // 附件操作
                if (filepath != null && filepath.size() > 0) {
                    for (String filename : filepath) {
                        MimeBodyPart mbp = new MimeBodyPart();
                        // 得到数据源
                        FileDataSource fds = new FileDataSource(filename);
                        // 得到附件本身并至入BodyPart
                        mbp.setDataHandler(new DataHandler(fds));
                        // 得到文件名同样至入BodyPart
                        mbp.setFileName(fds.getName());
                        mp.addBodyPart(mbp);
                    }
                    MimeBodyPart mbp = new MimeBodyPart();
                    mbp.setText(body);
                    mp.addBodyPart(mbp);
                    // 移走集合中的所有元素
                    filepath.clear();
                    // Multipart加入到信件
                    msg.setContent(mp);
                } else {
                    // 设置邮件正文
                    msg.setText(body);
                }
                // 设置信件头的发送日期
                msg.setSentDate(new Date());
                msg.saveChanges();
                // 发送信件
                Transport transport = session.getTransport("smtp");
                transport.connect(username, password);
                transport.sendMessage(msg,
                        msg.getRecipients(Message.RecipientType.TO));
                transport.close();
                return true;
            } else {
                System.out.println("None receiver!");
                return false;
            }
        } else {
            System.out.println("None receiver!");
            return false;
        }
    }

    public static void main(String[] args) throws AddressException,
            UnsupportedEncodingException, MessagingException {
        sendMail("[email protected],[email protected]", "注册信息邮件", "注册邮件，有附件", null);
        System.out.println("sendMail success!");
    }
}