java实现邮件发送，解决附件中文乱码问题

import java.io.FileInputStream;
import java.util.Date;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;

public class MySendEmail {
    public static void main(String[] args) {
        try{
            String userName="[email protected]";
            String password="123456";
            String smtp_server="smtp.163.com";
            String from_mail_address=userName;
            String to_mail_address="[email protected]";
            Authenticator auth=new PopupAuthenticator(userName,password);
            Properties mailProps=new Properties();
            mailProps.put("mail.smtp.host", smtp_server);
            mailProps.put("mail.smtp.auth", "true");
            mailProps.put("username", userName);
            mailProps.put("password", password);
            Session mailSession=Session.getDefaultInstance(mailProps, auth);
            mailSession.setDebug(true);
            MimeMessage message=new MimeMessage(mailSession);
            message.setFrom(new InternetAddress(from_mail_address));
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(to_mail_address));
            message.setSubject("Mail Test");
            // message.setSentDate(new Date()); // 设置邮件发送日期
            MimeMultipart multi=new MimeMultipart();
            String fileName = "E:\\文件验证.docx"; //发送附件的文件路径
            MimeBodyPart messageBodyPart = new MimeBodyPart();
            //邮件内容
            messageBodyPart.setText("Hi there is message info ");   
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);
            messageBodyPart = new MimeBodyPart();
            DataSource source = new FileDataSource(fileName);
            messageBodyPart.setDataHandler(new DataHandler(source));
            // 处理附件名称中文（附带文件路径）乱码问题
            messageBodyPart.setFileName(MimeUtility.encodeText(fileName));
            multipart.addBodyPart(messageBodyPart);
            message.setContent(multipart);
            Transport.send(message);
        }catch(Exception ex){
            System.err.println("邮件发送失败的原因是："+ex.getMessage());
            System.err.println("具体的错误原因");
            ex.printStackTrace(System.err);
        }
    }
}

//邮件账户验证

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

public class PopupAuthenticator extends Authenticator {
    private String username;
    private String password;
    public PopupAuthenticator(String username,String pwd){
        this.username=username;
        this.password=pwd;
    }
    public PasswordAuthentication getPasswordAuthentication(){
        return new PasswordAuthentication(this.username,this.password);
    }

}