Java发送邮件时标题和发件人乱码

最近碰到一个问题，Java发送邮件时，查看邮箱结果，发件人及邮件标题正文全部乱码

通过翻阅资料，原因及解决方法如下：

            // Set Subject: 头字段
            message.setSubject(MimeUtility.encodeText(mail, MimeUtility.mimeCharset("gb2312"), null));
            // 设置邮件发送日期
            message.setSentDate(new Date());
            // 设置邮件发件人名称
            Address address = new InternetAddress(mailTitle, MimeUtility.encodeText(mailTitle, MimeUtility.mimeCharset("gb2312"), null));
            // Set From: 头部头字段
            message.setFrom(address);
            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(toMail));// 设置邮件格式
            message.setContent(str, "text/html;charset=gbk");