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();

}

}