java 实现邮箱发送邮件功能

一，工具类

import java.io.File;
import java.util.Date;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.*;

/**
 * 邮件发送操作类
 *
 * @author tst
 *
 */
public class MailOperation {

    /**
     * 发送邮件
     * @param user 发件人邮箱

     * @return success 发送成功 failure 发送失败
     * @throws Exception
     */
    public String sendMail(MailSenderInfo mailSenderInfo)
            throws Exception {
        if (mailSenderInfo.getTo() != null){
            Properties props = System.getProperties();
            props.put("mail.smtp.host", mailSenderInfo.getHost());
            props.put("mail.smtp.auth", "true");
            MailAuthenticator auth = new MailAuthenticator();
            MailAuthenticator.USERNAME = mailSenderInfo.getUser();
            MailAuthenticator.PASSWORD = mailSenderInfo.getPassword();
            Session session = Session.getInstance(props, auth);
            session.setDebug(true);
            try {
                MimeMessage message = new MimeMessage(session);
                message.setFrom(new InternetAddress(mailSenderInfo.getFrom()));
                if (!mailSenderInfo.getTo().trim().equals(""))
                    message.addRecipient(Message.RecipientType.TO,
                            new InternetAddress(mailSenderInfo.getTo().trim()));
                message.setSubject(mailSenderInfo.getSubject());
                MimeBodyPart mbp1 = new MimeBodyPart(); // 正文
                mbp1.setContent(mailSenderInfo.getContent(), "text/html;charset=utf-8");
                Multipart mp = new MimeMultipart(); // 整个邮件：正文+附件
                // 为邮件添加附件
                String[] attachFileNames = mailSenderInfo.getAnnexs();
                if (attachFileNames != null && attachFileNames.length > 0) {
                    // 存放邮件附件的MimeBodyPart
                    MimeBodyPart attachment = null;
                    File file = null;
                    for (int i = 0; i < attachFileNames.length; i++) {
                        attachment = new MimeBodyPart();
                        // 根据附件文件创建文件数据源
                        file = new File(attachFileNames[i]);
                        FileDataSource fds = new FileDataSource(file);
                        attachment.setDataHandler(new DataHandler(fds));
                        // 为附件设置文件名
                        attachment.setFileName(MimeUtility.encodeWord(
                                file.getName(), "GBK", null));
                        mp.addBodyPart(attachment);
                    }
                }

                mp.addBodyPart(mbp1);
                message.setContent(mp);
                message.setSentDate(new Date());
                message.saveChanges();
                Transport trans = session.getTransport("smtp");
                trans.send(message);
                System.out.println(message.toString());
            } catch (Exception e){
                e.printStackTrace();
                return "failure";
            }
            return "success";
        }else{
            return "failure";
        }
    }

}

二，认证配置类

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

/**
 * 发件人账号密码
 * @author tst
 *
 */
public class MailAuthenticator extends   Authenticator{

    public static String USERNAME = "";
    public static String PASSWORD = "";

    public MailAuthenticator() {
    }

    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(USERNAME, PASSWORD);
    }

}

三，账户配置类

/**
 * @ClassName MailSenderInfo
 * @Description TODO
 * @Author tst
 * @Date 2019/9/2317:14
 * @Version
 **/
public class MailSenderInfo {
    private String user;//发件人邮箱
    private String password;//授权码（注意不是邮箱登录密码）
    private String host;
    private String from;//发件人
    private String to;//接收者邮箱
    private String subject;//邮件主题
    private String content;//邮件内容
    private String[] annexs;//邮件附件

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    public String getTo() {
        return to;
    }

    public void setTo(String to) {
        this.to = to;
    }

    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String[] getAnnexs() {
        return annexs;
    }

    public void setAnnexs(String[] annexs) {
        this.annexs = annexs;
    }
}