javaMail

邮件相关协议

• SMTP
• POP
• IMAP
• MIME

SMTP:简单邮件传输协议，用于传送电子邮件。SMTP服务器把消息转发给用作接收消息的SMTP服务器，用户可以通过POP或IMAP协议获取消息。

POP:邮局协议，当前版本为3，所以也称POP3，该协议主要用来接收邮件。

IMAP：接收邮件的更高级协议，当前到第四版，也称IMAP4。

MIME:多用途网际邮件扩充协议。不是邮件传输协议，主要是定义邮件的传输内容。

Java Mail 简单邮件发送实例：

package com.hml.mail;

import java.util.Properties;

import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SimpleMailSender {
    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        props.setProperty("mail.smtp.auth", "true");// 是否需要认证
        props.setProperty("mail.transport.protocol", "smtp"); // 邮件发送使用的协议
        Session session = Session.getInstance(props); // 获取默认的Seesion
        session.setDebug(true); // 设置Debug模式，这样在控制台就可以看到程序与邮件服务器的交互信息
        
        Message msg = new MimeMessage(session); // 创建邮件发送的消息
        msg.setText("你好吗？"); // 设置邮件发送的内容，此处为文本内容
        msg.setFrom(new InternetAddress("hml_vip@sina.com")); // 设置用哪个邮箱账号发送
    
        Transport transport = session.getTransport(); // 创建发送邮件的对象
        // 连接邮件服务器
        transport.connect("smtp.sina.com", 25, "hml_vip@sina.com", "******");
        transport.sendMessage(msg,
                new Address[]{new InternetAddress("916812579@qq.com")}); // 发送邮件

        //transport.send(msg,new Address[]{new InternetAddress("itcast_test@sohu.com")});
        transport.close();
    }
}

发送HTML内容

package com.hml.mail;

import java.io.FileInputStream;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SimpleMailSender {
    public static void main(String[] args) throws Exception {

        Properties props = new Properties();
        props.setProperty("mail.smtp.auth", "true");
        props.setProperty("mail.transport.protocol", "smtp");
        props.setProperty("mail.host", "smtp.sina.com");
        // 使用Authenticator认证
        Session session = Session.getInstance(props,
                new Authenticator()
                {
                    protected PasswordAuthentication getPasswordAuthentication()
                    {
                        return new PasswordAuthentication("hml_vip@sina.com","*****");
                    }
                }
        );
        session.setDebug(true);
        
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress("hml_vip@sina.com"));
        msg.setSubject("中文主题"); // 设置主题
        msg.setRecipients(RecipientType.TO, 
                InternetAddress.parse("916812579@qq.com")); // 设置收件人
        msg.setRecipients(RecipientType.CC, 
                InternetAddress.parse("916812579@qq.com")); // 设置抄送人
        msg.setRecipients(RecipientType.BCC, 
                InternetAddress.parse("916812579@qq.com")); // 设置密送人
        msg.setContent("<span style='color:red'>中文呵呵呵</span>", "text/html;charset=gbk");
        Transport.send(msg);
    }
}

带附件的邮件

package com.hml.mail;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.Authenticator;
import javax.mail.Message.RecipientType;
import javax.mail.PasswordAuthentication;
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;

public class SimpleMailSender {
    public static void main(String[] args) throws Exception {

        Properties props = new Properties();
        props.setProperty("mail.smtp.auth", "true");
        props.setProperty("mail.transport.protocol", "smtp");
        props.setProperty("mail.host", "smtp.sina.com");
        Session session = Session.getInstance(props, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("hml_vip@sina.com",
                        "******");
            }
        });
        session.setDebug(true);
        MimeMessage msg = new MimeMessage(session); //创建消息
        msg.setFrom(new InternetAddress("hml_vip@sina.com"));
        msg.setSubject(" ");
        msg.setReplyTo(new Address[] { new InternetAddress("916812579@qq.com") });
        msg.setRecipients(RecipientType.TO,
                InternetAddress.parse("916812579@qq.com"));

        MimeMultipart msgMultipart = new MimeMultipart(); // 创建复杂的消息
        msg.setContent(msgMultipart); // 添加复杂的消息到消息中

        MimeBodyPart attch = new MimeBodyPart(); // 创建附件
        msgMultipart.addBodyPart(attch);
        DataSource ds = new FileDataSource(
                "Java.txt");
        DataHandler dh = new DataHandler(ds);
        attch.setDataHandler(dh);
        attch.setFileName(MimeUtility.encodeText("java.txt")); // MimeUtility处理中文乱码
        Transport.send(msg);

    }
}