https://www.cnblogs.com/xdp-gacl/p/4216311.html

https://www.cnblogs.com/xdp-gacl/p/4209586.html

发送一封只包含文本的简单邮件

package me.gacl.main;

import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
* @ClassName: Sendmail
* @Description: 发送Email
* @author: 孤傲苍狼
* @date: 2015-1-12 下午9:42:56
*
*/ 
public class Sendmail {

    /**
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        
        Properties prop = new Properties();
        prop.setProperty("mail.host", "smtp.sohu.com");
        prop.setProperty("mail.transport.protocol", "smtp");
        prop.setProperty("mail.smtp.auth", "true");
        //使用JavaMail发送邮件的5个步骤
        //1、创建session
        Session session = Session.getInstance(prop);
        //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态
        session.setDebug(true);
        //2、通过session得到transport对象
        Transport ts = session.getTransport();
        //3、使用邮箱的用户名和密码连上邮件服务器，发送邮件时，发件人需要提交邮箱的用户名和密码给smtp服务器，用户名和密码都通过验证之后才能够正常发送邮件给收件人。
        ts.connect("smtp.sohu.com", "gacl", "邮箱密码");
        //4、创建邮件
        Message message = createSimpleMail(session);
        //5、发送邮件
        ts.sendMessage(message, message.getAllRecipients());
        ts.close();
    }
    
    /**
    * @Method: createSimpleMail
    * @Description: 创建一封只包含文本的邮件
    * @Anthor:孤傲苍狼
    *
    * @param session
    * @return
    * @throws Exception
    */ 
    public static MimeMessage createSimpleMail(Session session)
            throws Exception {
        //创建邮件对象
        MimeMessage message = new MimeMessage(session);
        //指明邮件的发件人
        message.setFrom(new InternetAddress("gacl@sohu.com"));
        //指明邮件的收件人，现在发件人和收件人是一样的，那就是自己给自己发
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("gacl@sohu.com"));
        //邮件的标题
        message.setSubject("只包含文本的简单邮件");
        //邮件的文本内容
        message.setContent("你好啊！", "text/html;charset=UTF-8");
        //返回创建好的邮件对象
        return message;
    }
}

发送包含内嵌图片的邮件

package me.gacl.main;

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

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
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;

/**
* @ClassName: Sendmail
* @Description: 发送Email
* @author: 孤傲苍狼
* @date: 2015-1-12 下午9:42:56
*
*/ 
public class Sendmail {

    /**
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        
        Properties prop = new Properties();
        prop.setProperty("mail.host", "smtp.sohu.com");
        prop.setProperty("mail.transport.protocol", "smtp");
        prop.setProperty("mail.smtp.auth", "true");
        //使用JavaMail发送邮件的5个步骤
        //1、创建session
        Session session = Session.getInstance(prop);
        //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态
        session.setDebug(true);
        //2、通过session得到transport对象
        Transport ts = session.getTransport();
        //3、连上邮件服务器，需要发件人提供邮箱的用户名和密码进行验证
        ts.connect("smtp.sohu.com", "gacl", "邮箱密码");
        //4、创建邮件
        Message message = createImageMail(session);
        //5、发送邮件
        ts.sendMessage(message, message.getAllRecipients());
        ts.close();
    }
    
    /**
    * @Method: createImageMail
    * @Description: 生成一封邮件正文带图片的邮件
    * @Anthor:孤傲苍狼
    *
    * @param session
    * @return
    * @throws Exception
    */ 
    public static MimeMessage createImageMail(Session session) throws Exception {
        //创建邮件
        MimeMessage message = new MimeMessage(session);
        // 设置邮件的基本信息
        //发件人
        message.setFrom(new InternetAddress("gacl@sohu.com"));
        //收件人
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("xdp_gacl@sina.cn"));
        //邮件标题
        message.setSubject("带图片的邮件");

        // 准备邮件数据
        // 准备邮件正文数据
        MimeBodyPart text = new MimeBodyPart();
        text.setContent("这是一封邮件正文带图片<img src='cid:xxx.jpg'>的邮件", "text/html;charset=UTF-8");
        // 准备图片数据
        MimeBodyPart image = new MimeBodyPart();
        DataHandler dh = new DataHandler(new FileDataSource("src\\1.jpg"));
        image.setDataHandler(dh);
        image.setContentID("xxx.jpg");
        // 描述数据关系
        MimeMultipart mm = new MimeMultipart();
        mm.addBodyPart(text);
        mm.addBodyPart(image);
        mm.setSubType("related");

        message.setContent(mm);
        message.saveChanges();
        //将创建好的邮件写入到E盘以文件的形式进行保存
        message.writeTo(new FileOutputStream("E:\\ImageMail.eml"));
        //返回创建好的邮件
        return message;
    }
}

发送包含附件的邮件

package me.gacl.main;

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

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
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;

/**
* @ClassName: Sendmail
* @Description: 发送Email
* @author: 孤傲苍狼
* @date: 2015-1-12 下午9:42:56
*
*/ 
public class Sendmail {

    /**
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        
        Properties prop = new Properties();
        prop.setProperty("mail.host", "smtp.sohu.com");
        prop.setProperty("mail.transport.protocol", "smtp");
        prop.setProperty("mail.smtp.auth", "true");
        //使用JavaMail发送邮件的5个步骤
        //1、创建session
        Session session = Session.getInstance(prop);
        //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态
        session.setDebug(true);
        //2、通过session得到transport对象
        Transport ts = session.getTransport();
        //3、连上邮件服务器
        ts.connect("smtp.sohu.com", "gacl", "邮箱密码");
        //4、创建邮件
        Message message = createAttachMail(session);
        //5、发送邮件
        ts.sendMessage(message, message.getAllRecipients());
        ts.close();
    }
    
    /**
    * @Method: createAttachMail
    * @Description: 创建一封带附件的邮件
    * @Anthor:孤傲苍狼
    *
    * @param session
    * @return
    * @throws Exception
    */ 
    public static MimeMessage createAttachMail(Session session) throws Exception{
        MimeMessage message = new MimeMessage(session);
        
        //设置邮件的基本信息
        //发件人
        message.setFrom(new InternetAddress("gacl@sohu.com"));
        //收件人
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("xdp_gacl@sina.cn"));
        //邮件标题
        message.setSubject("JavaMail邮件发送测试");
        
        //创建邮件正文，为了避免邮件正文中文乱码问题，需要使用charset=UTF-8指明字符编码
        MimeBodyPart text = new MimeBodyPart();
        text.setContent("使用JavaMail创建的带附件的邮件", "text/html;charset=UTF-8");
        
        //创建邮件附件
        MimeBodyPart attach = new MimeBodyPart();
        DataHandler dh = new DataHandler(new FileDataSource("src\\2.jpg"));
        attach.setDataHandler(dh);
        attach.setFileName(dh.getName());  //
        
        //创建容器描述数据关系
        MimeMultipart mp = new MimeMultipart();
        mp.addBodyPart(text);
        mp.addBodyPart(attach);
        mp.setSubType("mixed");
        
        message.setContent(mp);
        message.saveChanges();
        //将创建的Email写入到E盘存储
        message.writeTo(new FileOutputStream("E:\\attachMail.eml"));
        //返回生成的邮件
        return message;
    }
}

发送包含内嵌图片和附件的复杂邮件

package me.gacl.main;

import java.io.FileOutputStream;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
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;

/**
* @ClassName: Sendmail
* @Description: 发送Email
* @author: 孤傲苍狼
* @date: 2015-1-12 下午9:42:56
*
*/ 
public class Sendmail {

    /**
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        
        Properties prop = new Properties();
        prop.setProperty("mail.host", "smtp.sohu.com");
        prop.setProperty("mail.transport.protocol", "smtp");
        prop.setProperty("mail.smtp.auth", "true");
        //使用JavaMail发送邮件的5个步骤
        //1、创建session
        Session session = Session.getInstance(prop);
        //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态
        session.setDebug(true);
        //2、通过session得到transport对象
        Transport ts = session.getTransport();
        //3、连上邮件服务器
        ts.connect("smtp.sohu.com", "gacl", "邮箱密码");
        //4、创建邮件
        Message message = createMixedMail(session);
        //5、发送邮件
        ts.sendMessage(message, message.getAllRecipients());
        ts.close();
    }
    
    /**
    * @Method: createMixedMail
    * @Description: 生成一封带附件和带图片的邮件
    * @Anthor:孤傲苍狼
    *
    * @param session
    * @return
    * @throws Exception
    */ 
    public static MimeMessage createMixedMail(Session session) throws Exception {
        //创建邮件
        MimeMessage message = new MimeMessage(session);
        
        //设置邮件的基本信息
        message.setFrom(new InternetAddress("gacl@sohu.com"));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("xdp_gacl@sina.cn"));
        message.setSubject("带附件和带图片的的邮件");
        
        //正文
        MimeBodyPart text = new MimeBodyPart();
        text.setContent("xxx这是女的xxxx<br/><img src='cid:aaa.jpg'>","text/html;charset=UTF-8");
        
        //图片
        MimeBodyPart image = new MimeBodyPart();
        image.setDataHandler(new DataHandler(new FileDataSource("src\\3.jpg")));
        image.setContentID("aaa.jpg");
        
        //附件1
        MimeBodyPart attach = new MimeBodyPart();
        DataHandler dh = new DataHandler(new FileDataSource("src\\4.zip"));
        attach.setDataHandler(dh);
        attach.setFileName(dh.getName());
        
        //附件2
        MimeBodyPart attach2 = new MimeBodyPart();
        DataHandler dh2 = new DataHandler(new FileDataSource("src\\波子.zip"));
        attach2.setDataHandler(dh2);
        attach2.setFileName(MimeUtility.encodeText(dh2.getName()));
        
        //描述关系:正文和图片
        MimeMultipart mp1 = new MimeMultipart();
        mp1.addBodyPart(text);
        mp1.addBodyPart(image);
        mp1.setSubType("related");
        
        //描述关系:正文和附件
        MimeMultipart mp2 = new MimeMultipart();
        mp2.addBodyPart(attach);
        mp2.addBodyPart(attach2);
        
        //代表正文的bodypart
        MimeBodyPart content = new MimeBodyPart();
        content.setContent(mp1);
        mp2.addBodyPart(content);
        mp2.setSubType("mixed");
        
        message.setContent(mp2);
        message.saveChanges();
        
        message.writeTo(new FileOutputStream("E:\\MixedMail.eml"));
        //返回创建好的的邮件
        return message;
    }
}

二、在web中实现邮件的发送

编写邮件发送功能
发送邮件是一件非常耗时的事情，因此这里设计一个线程类来发送邮件

package me.gacl.web.controller;

import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import me.gacl.domain.User;

/**
* @ClassName: Sendmail
* @Description: Sendmail类继承Thread，因此Sendmail就是一个线程类，这个线程类用于给指定的用户发送Email
* @author: 孤傲苍狼
* @date: 2015-1-12 下午10:43:48
*
*/ 
public class Sendmail extends Thread {
        //用于给用户发送邮件的邮箱
    private String from = "gacl@sohu.com";
        //邮箱的用户名
    private String username = "gacl";
        //邮箱的密码
    private String password = "邮箱密码";
        //发送邮件的服务器地址
    private String host = "smtp.sohu.com";
    
    private User user;
    public Sendmail(User user){
        this.user = user;
    }
    
    /* 重写run方法的实现，在run方法中发送邮件给指定的用户
     * @see java.lang.Thread#run()
     */
    @Override
    public void run() {
        try{
            Properties prop = new Properties();
            prop.setProperty("mail.host", host);
            prop.setProperty("mail.transport.protocol", "smtp");
            prop.setProperty("mail.smtp.auth", "true");
            Session session = Session.getInstance(prop);
            session.setDebug(true);
            Transport ts = session.getTransport();
            ts.connect(host, username, password);
            Message message = createEmail(session,user);
            ts.sendMessage(message, message.getAllRecipients());
            ts.close();
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    
    /**
    * @Method: createEmail
    * @Description: 创建要发送的邮件
    * @Anthor:孤傲苍狼
    *
    * @param session
    * @param user
    * @return
    * @throws Exception
    */ 
    public Message createEmail(Session session,User user) throws Exception{
        
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(user.getEmail()));
        message.setSubject("用户注册邮件");
        
        String info = "恭喜您注册成功，您的用户名：" + user.getUsername() + ",您的密码：" + user.getPassword() + "，请妥善保管，如有问题请联系网站客服!!";
        message.setContent(info, "text/html;charset=UTF-8");
        message.saveChanges();
        return message;
    }
}

2.2编写处理用户注册的Servlet

package me.gacl.web.controller;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import me.gacl.domain.User;
import me.gacl.service.UserService;

public class RegisterServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try{
            String username = request.getParameter("username");
            String password = request.getParameter("password");
            String email = request.getParameter("email");
            User user = new User();
            user.setEmail(email);
            user.setPassword(password);
            user.setUsername(username);
            
            System.out.println("把用户信息注册到数据库中");
            //用户注册成功之后就使用用户注册时的邮箱给用户发送一封Email
            //发送邮件是一件非常耗时的事情，因此这里开辟了另一个线程来专门发送邮件
            Sendmail send = new Sendmail(user);
            //启动线程，线程启动之后就会执行run方法来发送邮件
            send.start();
            
            //注册用户
            //new UserService().registerUser(user);
            request.setAttribute("message", "恭喜您，注册成功，我们已经发了一封带了注册信息的电子邮件，请查收，如果没有收到，可能是网络原因，过一会儿就收到了！！");
            request.getRequestDispatcher("/message.jsp").forward(request, response);
        }catch (Exception e) {
            e.printStackTrace();
            request.setAttribute("message", "注册失败！！");
            request.getRequestDispatcher("/message.jsp").forward(request, response);
        }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}