学习博客：【JavaWeb】发送注册邮件

实现注册信息发送至邮箱的功能
Tomcat10 + JDK1.8

文件结构：

pom.xml

  4.0.0

  com.yl
  WebMail
  1.0-SNAPSHOT
  war

  
    
      jakarta.servlet
      jakarta.servlet-api
      5.0.0
    

    
      org.projectlombok
      lombok
      1.18.24
    

    
      com.sun.mail
      jakarta.mail
      2.0.1
    
  

User

package com.yl.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User {
    private String username;
    private String password;
    private String email;
    
}

SendMail

package com.yl.utils;

import com.sun.mail.util.MailSSLSocketFactory;
import com.yl.pojo.User;
import jakarta.mail.*;
import jakarta.mail.internet.InternetAddress;
import jakarta.mail.internet.MimeMessage;
import java.util.Properties;


//多线程实现用户体验  异步处理

public class SendMail extends Thread {


    private String from = "邮箱地址";	//你的邮箱地址

    private String pwd = "授权码";		//你的授权码

    private String host = "smtp.qq.com";

    private User user;

    public SendMail(User user){
        this.user=user;
    }

    //重写run方法 发送邮件给指定用户
    @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, pwd);
                }
            });

            //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, pwd);

            //4.创建邮件：写文件

            //传递session
            MimeMessage message=new MimeMessage(session);

            //发件人
            message.setFrom(new InternetAddress(from));

            //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);
        }

    }
}

RegisterServlet

package com.yl.servlet;

import com.yl.pojo.User;
import com.yl.utils.SendMail;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public class RegisterServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //接收用户请求，封装成对象
        String username = req.getParameter("username");
        String password = req.getParameter("pwd");
        String email = req.getParameter("email");

        System.out.println(username);
        System.out.println(password);
        System.out.println(email);

        User user = new User(username, password, email);

        //使用线程发送邮件，避免耗时及注册人数过多情况
        SendMail sm = new SendMail(user);
        sm.start();

        //注册用户
        req.setAttribute("message", "注册成功，请注意查收邮件");
        req.getRequestDispatcher("info.jsp").forward(req, resp);
        
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

web.xml

    
        RegisterServlet
        com.yl.servlet.RegisterServlet
    
    
        RegisterServlet
        /RegisterServlet.do
    
    
    

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    




    用户名：
    密码：
    邮箱：
    

info.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    



${message}