java mail 发送邮件，支持多个收件人，多个附件

今天对Java发送邮件的稍微搜索整理了下，记下来沉淀一下。

package com.datadriver.fosun.sendemail.action;

import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Properties;

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

import com.datadriver.common.util.log.Logger;

public class SendMailUtil {

    public static String send(String host, String mail, String password,
            String from, List<String> to, String title, String content,
            String[] fileNames) {
        String result = "邮件发送成功";
        // Get system properties
        Properties props = System.getProperties();

        // Setup mail server
        props.put("mail.smtp.host", host);

        // Get session
        props.put("mail.smtp.auth", "true"); // 这样才能通过验证

        MyAuthenticator myauth = new MyAuthenticator(mail, password);
        Session session = Session.getDefaultInstance(props, myauth);
        //session.setDebug(true);

        for (int i = 0; i < to.size(); i++) {
            // Set the to address

            // Define message
            MimeMessage message = new MimeMessage(session);
            // Set the from address
            try {
                message.setFrom(new InternetAddress(from));
            } catch (AddressException e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
                Logger.debug(e);
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
                Logger.debug(e);
            }

            // Set the subject
            try {
                message.setSubject(title);
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
                Logger.debug(e);
                result = "设置邮件主题错误";
            }

            // Set the content
            try {
                if (fileNames != null && fileNames.length > 0) {
                    BodyPart mdp = new MimeBodyPart();// 新建一个存放信件内容的BodyPart对象
                    mdp.setContent(content, "text/html;charset=GB2312");// 给BodyPart对象设置内容和格式/编码方式
                    Multipart mm = new MimeMultipart();// 新建一个MimeMultipart对象用来存放BodyPart对
                    // 象(事实上可以存放多个)
                    mm.addBodyPart(mdp);// 将BodyPart加入到MimeMultipart对象中(可以加入多个BodyPart)
                    // 把mm作为消息对象的内容
                    MimeBodyPart filePart;
                    FileDataSource filedatasource;
                    // 逐个加入附件
                    for (int j = 0; j < fileNames.length; j++) {
                        filePart = new MimeBodyPart();
                        filedatasource = new FileDataSource(fileNames[j]);
                        filePart
                                .setDataHandler(new DataHandler(filedatasource));
                        try {
                            filePart.setFileName(MimeUtility.encodeText(filedatasource.getName()));
                        } catch (UnsupportedEncodingException e) {
                            e.printStackTrace();
                        }

                        mm.addBodyPart(filePart);
                    }
                    message.setContent(mm);
                } else {
                    message.setText(content);
                }

            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
                Logger.debug(e);
                result = "设置邮件内容错误";
            }
            try {
                message.addRecipient(Message.RecipientType.TO,
                        new InternetAddress(to.get(i)));
            } catch (AddressException e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
                Logger.debug(e);
                result = "邮件地址解析失败";
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                result = "邮件信息错误";
            }
            try {
                message.saveChanges();
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
                Logger.debug(e);
                result = "邮件发送失败";
            }
            try {
                Transport.send(message);
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
                Logger.debug(e);
                result = "邮件发送失败";
            }
        }

        return result;
    }
}