Email邮件应用类

package com.jswhzl.lease.common.util;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

import com.jswhzl.lease.common.config.Constants;
import com.jswhzl.lease.entity.SendEmail;
import com.sun.mail.util.MailSSLSocketFactory;

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


/*@Service*/
public  class   Email {
 
	 private static Email email = null;  
	
				/** 
			     *  
			     * @function:获得单例 
			     */  
			    public static Email getInstance()  
			    {  
			        if(email==null)  
			        {  
			            synchronized (Email.class)   
			            {  
			                if(email==null) {  
			                	email = new Email();  
			                }  
			            }  
			        }  
			        return email;  
			    }  
 
	/**
	 * 发送邮件
	 * 
	 * @param mailTo
	 *            收件人
	 * @param title
	 *            邮件主题
	 * @param content
	 *            邮件内容 换行采用\n
	 * @param attachment
	 *            附件文件，可为null
	 * @throws Exception
	 */
	public void send(SendEmail send, File attachment) throws Exception {
		Properties props = new Properties();
		props.setProperty("mail.transport.protocol", Constants.EMAIL_PROTOCOL_TYPE); // 使用的协议（JavaMail规范要求）
		props.setProperty("mail.smtp.host", "smtp."+Constants.SENDER_EMAIL_SMTP_HOST+".com"); // 发件人的邮箱的
															// SMTP
															// 服务器地址
		props.setProperty("mail.smtp.auth", "true"); // 需要请求认证
		MailSSLSocketFactory sf = new MailSSLSocketFactory();
		sf.setTrustAllHosts(true);

		props.put("mail.smtp.ssl.enable", "true");
		props.put("mail.smtp.ssl.socketFactory", sf);
		// 用刚刚设置好的props对象构建一个session
		Session session = Session.getDefaultInstance(props);
		// 有了这句便可以在发送邮件的过程中在console处显示过程信息，供调试使
		// 用（你可以在控制台（console)上看到发送邮件的过程）
		session.setDebug(true);
		// 用session为参数定义消息对象
		MimeMessage message = new MimeMessage(session);
		try {

			String nick = "";
			try {
				nick = javax.mail.internet.MimeUtility.encodeText(send.getName());
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
			message.setFrom(new InternetAddress(nick + " <" + send.getUserName() + ">"));

			// 加载发件人地址
			// message.setFrom(new InternetAddress(from));

			if (send.getRecipients() == null || send.getRecipients().size() == 0) {
				throw new Exception("收件人不能为空");
			}
			if (send.getSubject() == null || "".equals(send.getSubject())) {
				throw new Exception("主题不能为空");
			}
			if (send.getContent() == null || "".equals(send.getContent())) {
				throw new Exception("邮件正文不能为空");
			}
			/*
			 * // 加载收件人地址 message.addRecipients(Message.RecipientType.TO,
			 * InternetAddress.parse(getMailList(mailTo))); //抄送 if(cs!=null &&
			 * cs.length>0) { message.setRecipients(Message.RecipientType.CC,
			 * InternetAddress.parse(getMailList(cs))); // 抄送人 }
			 */
			if (send.getRecipients() != null && send.getRecipients().size() > 0) {
				message.setRecipients(Message.RecipientType.BCC,
						InternetAddress.parse(getMailList(send.getRecipients()))); // 密送人
			}

			// 加载标题
			message.setSubject(send.getSubject());
			// 向multipart对象中添加邮件的各个部分内容，包括文本内容和附件
			Multipart multipart = new MimeMultipart();

			// 设置邮件的文本内容
			BodyPart contentPart = new MimeBodyPart();
			contentPart.setContent(send.getContent(), "text/html;charset=gb2312");
			// contentPart.setText(content);
			multipart.addBodyPart(contentPart);

			if (attachment != null) {
				BodyPart attachmentBodyPart = new MimeBodyPart();
				DataSource source = new FileDataSource(attachment);
				attachmentBodyPart.setDataHandler(new DataHandler(source));

				// 网上流传的解决文件名乱码的方法，其实用MimeUtility.encodeWord就可以很方便的搞定
				// 这里很重要，通过下面的Base64编码的转换可以保证你的中文附件标题名在发送时不会变成乱码

				// MimeUtility.encodeWord可以避免文件名乱码
				attachmentBodyPart.setFileName(MimeUtility.encodeWord(attachment.getName()));
				multipart.addBodyPart(attachmentBodyPart);
			}

			// 将multipart对象放到message中
			message.setContent(multipart);
			// 保存邮件
			message.saveChanges();
			// 发送邮件
			Transport transport = session.getTransport("smtp");
			// 连接服务器的邮箱
			System.out.println(send.getUserName() + "_--------" + send.getPassword());
			transport.connect("smtp."+Constants.SENDER_EMAIL_SMTP_HOST+".com", send.getUserName(), send.getPassword());
			// 把邮件发送出去
			transport.sendMessage(message, message.getAllRecipients());
			transport.close();
		} catch (Exception e) {
			e.printStackTrace();
			throw e;
		}
	}

	private String getMailList(List<String> mailArray) {
		StringBuffer toList = new StringBuffer();
		int length = mailArray.size();
		if (mailArray != null && length < 2) {
			toList.append(mailArray.get(0));
		} else {
			for (int i = 0; i < length; i++) {
				toList.append(mailArray.get(i));
				if (i != (length - 1)) {
					toList.append(",");
				}

			}
		}
		return toList.toString();

	}
       

}