本文共 8106 字，大约阅读时间需要 27 分钟。

1、文件构成

2.发送图片和附件

也要导包

package com.loey.mail;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.util.Properties;public class ComplexMail {
           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("XXXXXqq.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","XXXXX@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("XXXXXX@qq.com"));            //指明邮件的收件人            message.setRecipient(Message.RecipientType.TO,new InternetAddress("XXXXXXXX@qq.com"));            //邮件标题            message.setSubject("邮件主题");            //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("图片路径"));            //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");            //准备正文的数据            MimeBodyPart text=new MimeBodyPart();            text.setContent("我的图片：","text/html;charset=UTF-8");            //=================================准备附件数据            MimeBodyPart body= new MimeBodyPart();            body.setDataHandler(new DataHandler(new FileDataSource("附件路径")));            body.setFileName("1.txt");            //描述数据关系            MimeMultipart mm=new MimeMultipart();            mm.addBodyPart(text);            mm.addBodyPart(body);            mm.addBodyPart(image);           // mm.setSubType("related");如果只发送图片，则关系为related            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();        }}

3.练习：注册成功后发送注册成功的邮件到你邮箱

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>           
   
         用户名：
    
    
     密码： 
    
    
     邮箱：
    
    
     
     
   
  

success.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>    恭喜你注册成功，你将接收到一封邮件，请注意查收，如果网络延迟，请你耐心等待一会~

实体类User.java

package com.loey.pojo;public class User {
       private String userName;    private String pwd;    private String email;    @Override    public String toString() {
           return "User{" +                "userName='" + userName + '\'' +                ", pwd='" + pwd + '\'' +                ", email='" + email + '\'' +                '}';    }    public String getUserName() {
           return userName;    }    public void setUserName(String userName) {
           this.userName = userName;    }    public String getPwd() {
           return pwd;    }    public void setPwd(String pwd) {
           this.pwd = pwd;    }    public String getEmail() {
           return email;    }    public void setEmail(String email) {
           this.email = email;    }    public User(String userName, String pwd, String email) {
           this.userName = userName;        this.pwd = pwd;        this.email = email;    }    public User() {
       }}

RegistServlet.java

public class RegistServlet extends HttpServlet {
       @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
           doPost(req, resp);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
           String username=req.getParameter("username");        String password=req.getParameter("pwd");        String email=req.getParameter("email");        User user = new User(username, password, email);        MailUtil mail = new MailUtil(user);        mail.start();        resp.sendRedirect("/11_file/success.jsp");    }}

web.xml配置

   
          
            
     
      regist
             
     
      com.loey.servlet.RegistServlet
         
        
            
     
      regist
             
     
      /regist
         
    
   

MailUtil.java(核心）

package com.loey.utils;import com.loey.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;/** * @ClassName MailUtil * @Author 刘犁青 邮箱：loey724@163.com * @Date Create in 2020/12/18 20:48 * @Version 1.0 **/public class MailUtil extends Thread{
          //发件人邮箱地址        private String from="XXXX@qq.com";        private String host="smtp.qq.com";        private User user;        public MailUtil(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(from,"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(host,from,"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(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.getPwd()                        ,"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);            }        }}

结果

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