【JavaMail开发】使javamail-1.4.2 发送邮件时中文附件乱码或显示"??"的解决办法

使javamail-1.4.2 发送邮件时中文附件乱码或显示”??”的解决办法

首先需要导入的jar包 :

1. mail-1.4.1.jar 记得不是 javax.mail.jar

代码如下:

public class SendEmail {
public static final String user = "[e-mail]";// 发送邮件邮箱
public static final String pwd = "***************";// 发送邮件邮箱密码
public static final String smtp = "smtp.163.com";// 简单邮件传输协议
public static void main(String[] args) {
        List<String> recipients = new ArrayList<String>();// 收件人列表
        String recipient = "[e-mail]";// 收件人邮箱
        recipients.add(recipient);
        List<File> FileList = new ArrayList<File>();// 附件列表
        File file = new File("D:\\新建 360压缩 ZIP 文件.zip");
        FileList.add(file);
        String title = "邮件主题";
        String username = "发送邮件人";
        String text = "邮件文本";
try {
            Properties props = System.getProperties();
            props.put("mail.smtp.host", smtp);// 这里默认使用163邮箱
            Session session = null;
if (user != null && pwd != null) {
                props.put("mail.smtp.auth", "true");
                props.put("mail.smtp.user", user);
                props.put("mail.smtp.password", pwd);

            } else {
                props.put("mail.smtp.auth", "false");
            }
            session = Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user, pwd);
                }
            });
            SMTPMessage message = new SMTPMessage(session);
            message.setSubject(title);
            message.setFrom(new InternetAddress(user, username));
int receiverCount = recipients.size();
if (receiverCount > 0) {
                InternetAddress[] address = new InternetAddress[receiverCount];
for (int i = 0; i < receiverCount; i++) {
                    address[i] = new InternetAddress((String) recipients.get(i));
                }
                message.addRecipients(Message.RecipientType.TO, address);
            }

            MimeMultipart multi = new MimeMultipart();
            BodyPart textBodyPart = new MimeBodyPart();
            textBodyPart.setText(text);
            multi.addBodyPart(textBodyPart);
if (FileList != null) {
for (int i = 0; i < FileList.size(); i++) {
                    File f = (File) FileList.get(i);
                    FileDataSource fds = new FileDataSource(f);
                    BodyPart fileBodyPart = new MimeBodyPart();
                    fileBodyPart.setDataHandler(new DataHandler(fds));
                    fileBodyPart.setFileName(MimeUtility.encodeText(f.getName()));// 如果附件有中文通过转换没有问题了
                    multi.addBodyPart(fileBodyPart);
                }
            }
            message.setContent(multi);
            message.setSentDate(new Date());
            Transport.send(message);
            System.out.println("发送成功！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

最终效果如下 可正常显示中文附件名称

注意事项

1. 虽然 mail-1.4.1.jar 和 javax.mail.jar 这两个包基本功能都一样 , 但是使用后者时发送附件总出现问题 ,我是测了半天才发现的这个问题 .
2. 以下代码要特别注意:
   fileBodyPart.setFileName(MimeUtility.encodeText(f.getName()));