Javaweb_JavaMail

Javamail

1.与HTTP协议相同，收发右键也是需要协议的
  SMTP:发邮件协议
  POP3:收邮件协议
  IMAP:收发右键协议

2.导包：
    mail.jar
    activation.jar

3.核心类：
    (1)session
        如果你得到了它，表示已经与服务器连接上了，与Connection的作用相似
        得到session，需要使用session.getInstance(Properties,Authenticator);

        Properties props=new Properties();
        props.setProperty("mail.host","smtp.163.com");
        props.setProperty("mail.smtp.auth","true");

        Authenticator auth=new Authenticator(){
            protected PasswordAuthentication getPasswordAuthentication(){
                return new PasswordAuthentication("username","password");
            }
        };
        Session.getInstance(props,auth);

    (2).MimeMessage
        它表示一个邮件对象，你可以调用它的setFrom(),设置发件人、设置收件人、设置主题、设置正文！
    (3).TransPort
        它只有一个功能：发邮件

案例如下：

(1)发送普通邮件

 public void fun1() throws MessagingException {
        //设置Properties
        Properties prop=new Properties();
        //两个头！
        prop.setProperty("mail.host","smtp.163.com");
        prop.setProperty("mail.smtp.auth","true");

        //账号密码
        Authenticator auth=new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("","");
            }
        };

        //session需要两个参数，Properties和Authenticator
        Session session=Session.getInstance(prop,auth);

        MimeMessage msg=new MimeMessage(session);
        //From需要和上面的账号密码一致
        msg.setFrom(new InternetAddress(""));
        msg.setRecipients(Message.RecipientType.TO,"");
        msg.setSubject("厉害");
        msg.setContent("这是一封厉害的邮件","text/html;charset=utf-8");

        //发送！！！
        Transport.send(msg);

    }

2.发送带附件的邮件！

注意：需要用到 MimeMultipart

  @Test
    public void fun2() throws MessagingException, IOException {
        Properties prop=new Properties();
        prop.setProperty("mail.host","smtp.163.com");
        prop.setProperty("mail.smtp.auth","true");

        Authenticator auth=new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("","");
            }
        };

        //Session创建，需要两个参数
        Session session=Session.getInstance(prop,auth);

        //传概念MimeMessage
        MimeMessage msg=new MimeMessage(session);
        msg.setFrom(new InternetAddress(""));
        msg.setRecipients(Message.RecipientType.TO,"");
        msg.setSubject("哈哈邮件");

        //内容部分需要稍作修改

        //先创建MimeMultipart，来存储body
        MimeMultipart multipart=new MimeMultipart();

        //创建body1
        MimeBodyPart mbp1=new MimeBodyPart();
        mbp1.setContent("厉害了","text/html;charset=utf-8");
        multipart.addBodyPart(mbp1);

        //创建body2
        MimeBodyPart mbp2=new MimeBodyPart();
        mbp2.attachFile(new File("d:/a.jpg"));

        //MimeUtility.decodeText设置编码格式！！
        mbp2.setFileName(MimeUtility.decodeText("厉害图片.jpg"));
        multipart.addBodyPart(mbp2);

        msg.setContent(multipart);

        //发送邮件
        Transport.send(msg);

    }

（3）利用MailUtils包便捷发送邮件

   @Test
    public void fun3() throws IOException, MessagingException {
        Session session=MailUtils.createSession("smtp.163.com","","");
        Mail mail=new Mail("","","什么邮件","没有什么邮件");

        //添加附件
        AttachBean ab1=new AttachBean(new File("d:/baibing.jpg"),"厉害了.jpg");
        AttachBean ba2=new AttachBean(new File("d:/a.jpg"),"不厉害.jpg");

        mail.addAttach(ab1);
        mail.addAttach(ba2);

        MailUtils.send(session,mail);
    }