java 使用 mail 发送邮件

<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4</version>
</dependency>

public class MailFactory {
public static MailSender newMailSenderInstance(String host, String user, String password) {
MailSender mailSender = new MailSender(host, user, password);
return mailSender;
}
public static class MailSender {
private String host;
private String user;
private String password;

private MailSender(String host, String user, String password) {
super();
this.host = host;
this.user = user;
this.password = password;
}

public void send(String to, String subject, String content) {
this.send(user, to, subject, content, Boolean.FALSE);
}

public void sendHtml(String to, String subject, String content) {
this.send(user, to, subject, content, Boolean.TRUE);
}

private void send(String from, String to, String subject, String content, boolean isHtml) {
Properties props = new Properties();
props.put("mail.smtp.host", host); // 指定SMTP服务器
props.put("mail.smtp.auth", "true"); // 指定是否需要SMTP验证
if(to.contains(";")) {
String[] toArr = to.split(";");
for (String toItem: toArr) {
send(toItem, subject, content);
}
} else {
try {
Session mailSession = Session.getDefaultInstance(props);
Message message = new MimeMessage(mailSession);
message.setFrom(new InternetAddress(from)); // 发件人
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to)); // 收件人
message.setSubject(subject); // 邮件主题
if (isHtml) {
//指定邮箱内容及ContentType和编码方式
message.setContent(content, "text/html;charset=utf-8");
} else {
message.setText(content);
}
message.saveChanges();
Transport transport = mailSession.getTransport("smtp");
transport.connect(host, user, password);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
} catch(Exception e) {
e.printStackTrace();
}
}
}
}

}