包含图片

package com.dyq;
import com.sun.mail.util.MailSSLSocketFactory;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.security.GeneralSecurityException;
import java.util.Properties;
/**
 * 发送一封简单的邮件
 */
public class MailDemo01 {
    public static void main(String[] args) throws Exception {
        Properties prop = new Properties();
        prop.setProperty("mail.host", "smtp.qq.com");  //设置QQ邮件服务区
        prop.setProperty("mail.transport.protocol", "smtp");  //邮件发送协议
        prop.setProperty("mail.smtp.auth", "true");   //需要验证用户名密码
        //关于QQ邮箱，还要设置SSL加密，加上以下代码即可，大厂，其他邮箱不需要
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        prop.put("mail.smtp.ssl.enable", "true");
        prop.put("mail.smtp.socketFactory", sf);
        //使用JavaMail发送邮箱的5个步骤
        //1.创建定义整个应用程序所需的环境信息的Session对象
        //QQ才有，其他邮箱不用
        Session session = Session.getInstance(prop, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("504561395@qq.com", "xkmwtqwlqsbgbgfb");
            }
        });
        // 开启Session的debug模式:可以看到程序发送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授权码连上邮件服务器
        ts.connect("smtp.qq.com", "504561395@qq.com", "xkmwtqwlqsbgbgfb");
        //4.创建邮箱:写邮件
        //注意需要传递Session
        Message message = new MimeMessage(session);
        //指明邮件的发件人
        message.setFrom(new InternetAddress("504561395@qq.com"));
        //指明收件人
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("504561395@qq.com"));
        //设置邮箱标题
        message.setSubject("秃头小分队Demo");
        //邮件的文本内容
        //========================================================================
        //准备图片数据
        MimeBodyPart image=new MimeBodyPart();
        //图片需要经过数据化的处理  DataHandler数据处理
        DataHandler dh=new DataHandler(new FileDataSource("C:\\Users\\DYQ\\IdeaProjects\\javaweb-mail\\src\\0.png"));
        //在我们的的body中放入这个处理的图片数据
        image.setDataHandler(dh);
        //给这个图片设置一个ID名字，我们在后面可以使用 （76行cid
        image.setContentID("bz.jpg");
        //准备正文的数据
        MimeBodyPart text=new MimeBodyPart();
//        cid：setContentID
        text.setContent("这是一张正文<img src='cid:bz.jpg'>","text/html;charset=UTF-8");
        //描述数据关系
        MimeMultipart mm=new MimeMultipart();
        mm.addBodyPart(text);
        mm.addBodyPart(image);
        mm.setSubType("related");//mm.setSubType("mixed");
        //设置到消息中，保存修改
        message.setContent(mm);  //把最后编辑好的邮件放到消息当中
        message.saveChanges();   //保存修改
        //5.发送邮件
        ts.sendMessage(message,message.getAllRecipients());
        //6.关闭
        ts.close();
    }
}

包含附件

import com.sun.mail.util.MailSSLSocketFactory;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;
public class MailDemo03 {
    public static void main(String[] args) throws Exception {
        Properties prop=new Properties();
        prop.setProperty("mail.host","smtp.qq.com");///设置QQ邮件服务器
        prop.setProperty("mail.transport.protocol","smtp");///邮件发送协议
        prop.setProperty("mail.smtp.auth","true");//需要验证用户密码
        //QQ邮箱需要设置SSL加密
        MailSSLSocketFactory sf=new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        prop.put("mail.smtp.ssl.enable","true");
        prop.put("mail.smtp.ssl.socketFactory",sf);
        //使用javaMail发送邮件的5个步骤
        //1.创建定义整个应用程序所需要的环境信息的session对象
        Session session=Session.getDefaultInstance(prop, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("1192XXXX@qq.com","授权码");
            }
        });
        //开启session的debug模式，这样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授权码连上邮件服务器
        ts.connect("smtp.qq.com","1192XXXX@qq.com","授权码");
        //4.创建邮件：写文件
        //注意需要传递session
        MimeMessage message=new MimeMessage(session);
        //指明邮件的发件人
        message.setFrom(new InternetAddress("1192XXXX@qq.com"));
        //指明邮件的收件人
        message.setRecipient(Message.RecipientType.TO,new InternetAddress("1192XXXX@qq.com"));
        //邮件标题
        message.setSubject("java发出");
        //邮件的文本内容
        //=================================准备图片数据
        MimeBodyPart image=new MimeBodyPart();
        //图片需要经过数据化的处理
        DataHandler dh=new DataHandler(new FileDataSource("D:\\Bert\\1594126632(1).jpg"));
        //在part中放入这个处理过图片的数据
        image.setDataHandler(dh);
        //给这个part设置一个ID名字
        image.setContentID("bz.jpg");
        //=================================准备正文数据
        MimeBodyPart text=new MimeBodyPart();
        text.setContent("这是一张正文<img src='cid:bz.jpg'>","text/html;charset=UTF-8");
        //=================================准备附件数据
        MimeBodyPart body1= new MimeBodyPart();
        body1.setDataHandler(new DataHandler(new FileDataSource("D:\\Bert\\cmd.txt")));
        body1.setFileName("1.txt");
        //描述数据关系
        MimeMultipart mm=new MimeMultipart();
        mm.addBodyPart(body1);
        mm.addBodyPart(text);
        mm.addBodyPart(image);
        mm.setSubType("mixed");
        //设置到消息中，保存修改
        message.setContent(mm);
        message.saveChanges();
        //5.发送邮件
        ts.sendMessage(message,message.getAllRecipients());
        //6.关闭连接
        ts.close();
    }
}

实战：注册通知邮件

index.JSP

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h2>Hello World!</h2>
<form action="${pageContext.request.contextPath}/RegisterServlet.do" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="text" name="pwd"><br>
    邮箱：<input type="text" name="email"><br>
    <input type="submit" value="注册">
</form>
</body>
</html>

实体类

package com.dyq.pojo;
public class User {
    private String username;
    private String password;
    private String email;
    public User() {
    }
    public User(String username, String password, String email) {
        this.username = username;
        this.password = password;
        this.email = email;
    }
    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
}

绑定路径

<servlet>
    <servlet-name>RegisterServlet</servlet-name>
    <servlet-class>cn.csn.MailDemo01.servlet.RegisterServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>RegisterServlet</servlet-name>
    <url-pattern>/RegisterServlet.do</url-pattern>
  </servlet-mapping>

servlet

package com.dyq.servlet;
import com.dyq.pojo.User;
import com.dyq.utils.Sendmail;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class RegisterServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //接受用户请求，封装成对象
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        String email=request.getParameter("email");
        User user = new User(username, password, email);
        //用户注册成功之后，给用户发送一封邮件
        //我们使用线程来专门发送邮件，防止出现耗时，和网站注册人数过多的情况
        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
        request.setAttribute("message","注册成功");
        request.getRequestDispatcher("info.jsp").forward(request,response);
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }
}

发送邮件核心类

package com.dyq.utils;
import com.dyq.pojo.User;
import com.sun.mail.util.MailSSLSocketFactory;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;
//网站3秒原则：用户体验
//多线程实现用户体验  (异步处理
public class Sendmail extends Thread{
    //用于给用户发送邮件的邮箱
    private String from="504561395@qq.com";
    //邮箱的用户名
    private String username="504561395.qq.com";
    //邮箱的密码
    private String password="xkmwtqwlqsbgbgfb";
    //发送邮箱的地址
    private String host = "smtp.qq.com";
    private User user;
    public Sendmail(User user){
        this.user=user;
    }
    @Override
    public void run() {
        try {
            Properties prop = new Properties();
            prop.setProperty("mail.host", host);///设置QQ邮件服务器
            prop.setProperty("mail.transport.protocol", "smtp");///邮件发送协议
            prop.setProperty("mail.smtp.auth", "true");//需要验证用户密码
            //QQ邮箱需要设置SSL加密
            MailSSLSocketFactory sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);
            prop.put("mail.smtp.ssl.enable", "true");
            prop.put("mail.smtp.ssl.socketFactory", sf);
            //使用javaMail发送邮件的5个步骤
            //1.创建定义整个应用程序所需要的环境信息的session对象
            Session session = Session.getDefaultInstance(prop, new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("504561395@qq.com", "xkmwtqwlqsbgbgfb");
                }
            });
            //开启session的debug模式，这样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授权码连上邮件服务器
            ts.connect(host, username, "xkmwtqwlqsbgbgfb");
            //4.创建邮件：写文件
            //注意需要传递session
            MimeMessage message = new MimeMessage(session);
            //指明邮件的发件人
            message.setFrom(new InternetAddress(from));
            //指明邮件的收件人
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(user.getEmail()));
            //邮件标题
            message.setSubject("注册通知");
            //邮件的文本内容
            message.setContent("恭喜你(" + user.getUsername() + ")成功注册！" + "密码：" + user.getPassword()
                    , "text/html;charset=UTF-8");
            //5.发送邮件
            ts.sendMessage(message, message.getAllRecipients());
            //6.关闭连接
            ts.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

这里引入多线程的目的是为了提高用户的体验，防止因发送文件时间过长，导致前端响应过久，因此这里采用异步响应。

Java Web 开发

发送带附件邮件

包含图片

包含附件

实战：注册通知邮件

index.JSP

实体类

绑定路径

servlet

发送邮件核心类