发邮件 和 excel导出中文文件名

/**
     * 发邮件
     * @param email
     * @param subject
     * @param body
     * @throws UnsupportedEncodingException
     */
    public static void sendEmail(String email, String subject, String body)
            throws UnsupportedEncodingException,NoSuchProviderException,MessagingException,Exception {
        try {
            Properties props = new Properties();
            String server=getPropertiesByKey("mail.smtp.host");
            System.out.println("server:"+server);
            props.put("mail.smtp.host", server);
            props.put("mail.smtp.port", "25");
            props.put("mail.smtp.auth", "true");
            String user=getPropertiesByKey("mail.sendemail");
            String password=getPropertiesByKey("mail.password");
            String from=getPropertiesByKey("mail.senduser"); 
            Transport transport = null;
            Session session = Session.getDefaultInstance(props, null);
            transport = session.getTransport("smtp");
            transport.connect(server, user, password);
            MimeMessage msg = new MimeMessage(session);
            msg.setSentDate(new Date());
            InternetAddress fromAddress = new InternetAddress(user, from,
                    "UTF-8");
            msg.setFrom(fromAddress);
            
            String[] emails=email.split(";");
            
            InternetAddress[] toAddress = new InternetAddress[emails.length];
            for(int i=0;i<emails.length;i++){
                toAddress[i] = new InternetAddress(emails[i]);    
            }
            
            msg.setRecipients(Message.RecipientType.TO, toAddress);
            //System.out.println("subject:"+subject);
            msg.setSubject(subject, "UTF-8");
            
            Multipart mainPart=new MimeMultipart();
            //创建一个包含Html内容的MimeBodyPart
            MimeBodyPart htmlText=new MimeBodyPart();
            //设置HTML内容
            htmlText.setContent(body,"text/html;charset=utf-8");  //"text/html;charset=utf-8"
            mainPart.addBodyPart(htmlText);

            msg.setContent(mainPart);
            
            //msg.setText(body, "UTF-8");
            //msg.saveChanges();
            //transport.sendMessage(msg, msg.getAllRecipients());
            transport.sendMessage(msg, msg.getAllRecipients());
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
            throw e;
        } catch (MessagingException e) {
            e.printStackTrace();
            throw e;
        }catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }

/**
    * excel导出中文文件名
    * @param s
    * @return
    */
   public static String toUtf8String(String s) 
   {   
       StringBuffer sb = new StringBuffer();   
       for (int i=0;i<s.length();i++){   
       char c = s.charAt(i);   
       if (c >= 0 && c <= 255) {   
       sb.append(c);   
       } else {   
       byte[] b;   
       try {   
       b = Character.toString(c).getBytes("utf-8");   
       } catch (Exception ex) {   
       System.out.println(ex);   
       b = new byte[0];   
       }   
      for (int j = 0; j < b.length; j++) {   
       int k = b[j];   
       if (k < 0) k += 256;   
       sb.append("%" + Integer.toHexString(k).   
       toUpperCase());   
      }   
      }   
      }   
      return sb.toString();   
}