先看源码，再来理解，可以直接使用！
JavaMailWithAttachment.java：
private MimeMessage message;
private Session session;
private Transport transport;
private String mailHost = "";
private String sender_username = "";
private String sender_password = "";
private String contentPart_Type = "";
private Properties properties = new Properties();
/*
* 初始化方法
*/
public JavaMailWithAttachment() {
try {
FileInputStream is=new FileInputStream("E:/workspace1.6/ICRM-H5/src/mailServer.properties");
properties.load(is);
this.mailHost = properties.getProperty("mail.smtp.host");
this.sender_username = properties.getProperty("mail.sender.username");
this.sender_password = properties.getProperty("mail.sender.password");
this.contentPart_Type = properties.getProperty("mail.contentPart.type");
} catch (IOException e) {
e.printStackTrace();
}
session = Session.getInstance(properties);
session.setDebug(true); //开启后有调试信息,发布时关闭
message = new MimeMessage(session);
}
/**
* 发送邮件
* @param subject
* 邮件主题
* @param sendHtml
* 邮件内容
* @param toUser
* 收件人 多个时参数形式 ： "xxx@,xxx@,xxx@"
* @param ccUser
* 抄送人 同上
* @param bccUser
* 密送人 同上
* @param attachment
* 附件
*/
public void doSendHtmlEmail(String subject, String sendHtml,
String toUser, String ccUser, String bccUser, File [] attachment){
try {
// 发件人
InternetAddress from = new InternetAddress(sender_username);
message.setFrom(from);
// 设置多个收件人地址
if(null != toUser && !toUser.isEmpty()){
@SuppressWarnings("static-access")
InternetAddress[] internetAddressTo = new InternetAddress().parse(toUser);
message.setRecipients(Message.RecipientType.TO, internetAddressTo);
}
// 设置多个抄送地址
if(null != ccUser && !ccUser.isEmpty()){
@SuppressWarnings("static-access")
InternetAddress[] internetAddressCC = new InternetAddress().parse(ccUser);
message.setRecipients(, internetAddressCC);
}
// 设置多个密送地址
if(null != bccUser && !bccUser.isEmpty()){
@SuppressWarnings("static-access")
InternetAddress[] internetAddressBCC = new InternetAddress().parse(bccUser);
message.setRecipients(Message.RecipientType.BCC, internetAddressBCC);
}
// 发送日期
message.setSentDate(new Date());
// 邮件主题
message.setSubject(subject);
// 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();
// 添加邮件正文
BodyPart contentPart = new MimeBodyPart();
contentPart.setContent(sendHtml, contentPart_Type);
multipart.addBodyPart(contentPart);
BodyPart attachmentBodyPart = null;
// 添加附件的内容
if (null != attachment && attachment.length != 0) {
for (File file : attachment) {
attachmentBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(file);
attachmentBodyPart.setDataHandler(new DataHandler(source));
//MimeUtility.encodeWord可以避免文件名乱码
attachmentBodyPart.setFileName(MimeUtility.encodeWord(file.getName()));
multipart.addBodyPart(attachmentBodyPart);
}
}
// 将multipart对象放到message中
message.setContent(multipart);
// 保存邮件
message.saveChanges();
// smtp验证
transport = session.getTransport("smtp");
transport.connect(mailHost, sender_username, sender_password);
// 发送
transport.sendMessage(message, message.getAllRecipients());
System.out.println("发送成功！");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (transport != null) {
try {
transport.close();
} catch (MessagingException e) {
e.printStackTrace();
}
}
}
}
mailServer.properties：
mail.smtp.host = smtp.
mail.smtp.auth = true
mail.sender.username = xxxx@
mail.sender.password = xxxxx
mail.contentPart.type = text/html;charset=UTF-8
由于javaMail需要一个Properties来注册Session，因此创建一个Properties来写入javaMail所需要的注册信息
mail.smtp.host发送方的smtp服务器，现在默认的是网易企业邮箱的smtp服务器，可以根据不同的邮箱进行更改。
mail.smtp.auth向smtp服务器提交认证
mail.sender.username发送者邮箱
mail.smtp.password发送者邮箱密码
还需要两个jar包：activation.jar ,mail.jar
下载地址：http://download..net/detail/qq741437836/9600110
