使用javamail发送邮件为何邮件是无主题？

使用javamail发送无主题，附上邮件原文

Received: from DESKTOP-0AVLR3N ([119.123.164.68])
	by newxmesmtplogicsvrszb6.qq.com (NewEsmtp) with SMTP
	id A9B358D2; Mon, 31 May 2021 14:42:27 +0800
X-QQ-mid: xmsmtpt1622443347tvck6yw8a
Message-ID: <tencent_39C51FB25CD3419DC2A5B1ABE086896F9E09@qq.com>
X-QQ-XMAILINFO: M+kJ3+asFsV8ptZUg9M5141ZTVUxpCoBaq6GrZ5cQA+c8/T9FhKoDAKmpQ0nXB
	 F5bahk21CsAE4S2pH5aMCdmiQRWSNIMinV16aeI1mHF1VOORmZ6VN1F9LNltlNYfzSFIrTBA3wYj
	 sCf1WBS4OP8eHL+6PF0TKgyzai9cscl0VMiop13zLRgeKzSiU23Rz8wV+/JBabc8oPHtHSZeN+cZ
	 Kg5eP8vBg9P2/q4aUVDf74KTlXk0QuYOu8t+b9EMtJaRdAY1GCW+ru8YpiDztZAWQN2zBBWuVOxn
	 caHTdkp1x6UY/jGgZpVLtJ4D/xzL9XOCwoKXzADrE4ZxCtvDriYGI2D/srIlKCQiW7D99cAKZFjX
	 VyNnignDNSV+XGXCPAEoNqly8v3TCXYGiSFkoF1PxyA09MxUmLvn/aLm8eB6uMHMXlisE1KEx5ym
	 w+hPjINuVg7rJirdogJZQTi6I1s8U4PnOVLio+4qg0Iw2h5HEpuJcd/pMSXl0CzqIe+OgJRnd2c8
	 SXw+ob5rKkOkfDnmlkZRvqZsSRtQJl+oUI6c8EhT1Hbf4PtU5y4zXc88Oh3aS0f5QaDLBSFfFOnL
	 4E3RTBJNy+5clQkaYHDY25VCXwN9ytMNC3zII=
From: xxxx@qq.com
To: xxxx@qq.com
X-OQ-MSGID: <108979786.01622443346666.JavaMail.

后台输出的内容是：

DATA
354 End data with <CR><LF>.<CR><LF>.
From: xxxx@qq.com
To: xxxxx@qq.com
Message-ID: <375562226.01622445154053.JavaMail. �獛澠@smtp.qq.com>
Subject: =?GBK?B?u7bTrdeisuF0aGhoo6E=?=
MIME-Version: 1.0
Content-Type: text/html;charset=UTF-8
Content-Transfer-Encoding: base64

PHA+PGgyPuaBreWWnOazqOWGjOaIkOWKn++8gTwvaDI+PC9wPuaCqOeahOeUqOaIt+WQjeS4uu+8
mjxoND5hPC9oND7or7flpqXlloTkv53nrqHmgqjnmoTlr4bnoIHvvIzlpoLmnInpl67popjor7fl
j4rml7bogZTns7vnvZHnq5nlrqLmnI3vvIzlho3mrKHmrKLov47mgqjnmoTliqDlhaXvvIHvvIE=
.
250 OK: queued as.
QUIT
221 Bye.

哪位大佬帮我看看

你把代码发出来，有设置主题的方法。

 public boolean sendMail(String to, String text, String title) {
        try {
            final Properties props = new Properties();
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.host", "smtp.qq.com");

            // 发件人的账号
            props.put("mail.user", user);
            //发件人的密码
            props.put("mail.password", password);

            // 构建授权信息，用于进行SMTP进行身份验证
            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    // 用户名、密码
                    String userName = props.getProperty("mail.user");
                    String password = props.getProperty("mail.password");
                    return new PasswordAuthentication(userName, password);
                }
            };
            // 使用环境属性和授权信息，创建邮件会话
            Session mailSession = Session.getInstance(props, authenticator);
            // 创建邮件消息
            MimeMessage message = new MimeMessage(mailSession);
            // 设置发件人
            String username = props.getProperty("mail.user");
            InternetAddress form = new InternetAddress(username);
            message.setFrom(form);

            // 设置收件人
            InternetAddress toAddress = new InternetAddress(to);
            message.setRecipient(Message.RecipientType.TO, toAddress);

            // 设置邮件标题
            message.setSubject(title);

            // 设置邮件的内容体
            message.setContent(text, "text/html;charset=UTF-8");
            // 发送邮件
            Transport.send(message);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    @Test
    public void test() {
        sendMail("要发送的邮箱", "邮件内容", "标题");

    }

}

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