Java发送邮件（网易邮箱）

1.准备工作

开启设置客户端授权码，记住设置的授权码

开启服务

2.代码

封装邮件信息

public class Mail {

    /**
     * 发件人
     */
    private String from;
    /**
     * 收件人
     */
    private StringBuilder toAddress = new StringBuilder();
    /**
     * 抄送
     */
    private StringBuilder ccAddress = new StringBuilder();
    /**
     * 暗送
     */
    private StringBuilder bccAddress = new StringBuilder();
    /**
     * 主题
     */
    private String subject;
    /**
     * 正文
     */
    private String content;


    public Mail() {}

    public Mail(String from, String to) {
        this(from, to, null, null);
    }

    public Mail(String from, String to, String subject, String content) {
        this.from = from;
        this.toAddress.append(to);
        this.subject = subject;
        this.content = content;
    }

    /**
     * 返回发件人
     * @return
     */
    public void setFrom(String from) {
        this.from = from;
    }

    /**
     * 返回发件人
     * @return
     */
    public String getFrom() {
        return from;
    }

    /**
     * 返回主题
     */
    public String getSubject() {
        return subject;
    }

    /**
     * 设置主题
     */
    public void setSubject(String subject) {
        this.subject = subject;
    }

    /**
     * 获取主题内容
     */
    public String getContent() {
        return content;
    }

    /**
     * 设置主题内容
     * @param content
     */
    public void setContent(String content) {
        this.content = content;
    }

    /**
     * 获取收件人
     * @return
     */
    public String getToAddress() {
        return toAddress.toString();
    }

    /**
     * 获取抄送
     * @return
     */
    public String getCcAddress() {
        return ccAddress.toString();
    }

    /**
     * 获取暗送
     * @return
     */
    public String getBccAddress() {
        return bccAddress.toString();
    }

    /**
     * 添加收件人,可以是多个收件人
     * @param to
     */
    public void addToAddress(String to) {
        if(this.toAddress.length() > 0) {
            this.toAddress.append(",");
        }
        this.toAddress.append(to);
    }

    /**
     * 添加抄送人，可以是多个抄送人
     * @param cc
     */
    public void addCcAddress(String cc) {
        if(this.ccAddress.length() > 0) {
            this.ccAddress.append(",");
        }
        this.ccAddress.append(cc);
    }

    /**
     * 添加暗送人，可以是多个暗送人
     * @param bcc
     */
    public void addBccAddress(String bcc) {
        if(this.bccAddress.length() > 0) {
            this.bccAddress.append(",");
        }
        this.bccAddress.append(bcc);
    }
}

验证发送

public class WyMail {
    public static Session createSession(String host, final String username, final String password) {
        Properties prop = new Properties();
        prop.setProperty("mail.host", host);// 指定主机
        prop.setProperty("mail.smtp.auth", "true");// 指定验证为true
        prop.setProperty("mail.smtp.starttls.enable", "true");
        prop.setProperty("mail.smtp.ssl.trust", "smtp.163.com");


        // 创建验证器
        Authenticator auth = new Authenticator() {
            @Override
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        };

        // 获取session对象
        return Session.getInstance(prop, auth);
    }

    /**
     * 发送指定的邮件
     *
     * @param mail
     */
    public static void send(Session session, final Mail mail) throws MessagingException,
            IOException, AddressException {

        MimeMessage msg = new MimeMessage(session);// 创建邮件对象
        msg.setFrom(new InternetAddress(mail.getFrom()));// 设置发件人
        msg.addRecipients(Message.RecipientType.TO, mail.getToAddress());// 设置收件人

        //设置抄送
        String cc = mail.getCcAddress();
        if (!cc.isEmpty()) {
            msg.addRecipients(Message.RecipientType.CC, cc);
        }

        //设置暗送
        String bcc = mail.getBccAddress();
        if (!bcc.isEmpty()) {
            msg.addRecipients(Message.RecipientType.BCC, bcc);
        }
        //设置主题
        msg.setSubject(mail.getSubject());

        //创建部件集对象
        MimeMultipart parts = new MimeMultipart();
        //创建一个部件
        MimeBodyPart part = new MimeBodyPart();
        //设置邮件文本内容
        part.setContent(mail.getContent(), "text/html;charset=utf-8");
        //把部件添加到部件集中
        parts.addBodyPart(part);
        //给邮件设置内容
        msg.setContent(parts);
        //发邮件
        Transport.send(msg);
    }
}

配置文件

subject=邮件标题
content=邮件内容
from=发送者
host=smtp.163.com
username=邮箱地址（不含后缀名）
password=授权码

总结：
异常 javax.mail.MessagingException: Could not convert socket to TLS
解决方案：添加 prop.setProperty(“mail.smtp.ssl.trust”, “smtp.163.com”)
异常 javax.mail.MessagingException:[EOF]
结局方案：添加 prop.setProperty(“mail.smtp.starttls.enable”, “true”)