编写一个发送邮件的工具类后端用spring boot前端用thyme leaf 代码加注释

以下是一个简单的发送邮件的工具类，使用JavaMail API实现。在Spring Boot中使用时，需要在pom.xml文件中添加相关依赖，并在application.properties文件中配置邮件服务器信息。

package com.example.mail;

import java.util.Properties;

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

public class MailUtil {

    private static final String SMTP_HOST = "smtp.gmail.com"; // 邮件服务器
    private static final String SMTP_PORT = "465"; // 端口号
    private static final String USERNAME = "your_email@gmail.com"; // 发送邮件的账号
    private static final String PASSWORD = "your_password"; // 发送邮件的密码

    /**
     * 发送邮件
     * @param to 收件人邮箱
     * @param subject 邮件主题
     * @param content 邮件内容
     * @throws AddressException
     * @throws MessagingException
     */
    public static void sendMail(String to, String subject, String content) throws AddressException, MessagingException {
        Properties props = new Properties();
        props.setProperty("mail.transport.protocol", "smtp");
        props.setProperty("mail.smtp.host", SMTP_HOST);
        props.setProperty("mail.smtp.port", SMTP_PORT);
        props.setProperty("mail.smtp.auth", "true");
        props.setProperty("mail.smtp.ssl.enable", "true");
        props.setProperty("mail.smtp.ssl.trust", SMTP_HOST);

        Session session = Session.getDefaultInstance(props, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(USERNAME, PASSWORD);
            }
        });

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(USERNAME));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
        message.setSubject(subject);
        message.setText(content);

        Transport.send(message);
    }
}

在Thymeleaf视图中，可以使用以下代码调用上述工具类发送邮件：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Send Mail</title>
</head>
<body>
    <form method="post" th:action="@{/send}">
        <label for="to">To:</label>
        <input type="email" id="to" name="to" required>
        <br>
        <label for="subject">Subject:</label>
        <input type="text" id="subject" name="subject" required>
        <br>
        <label for="content">Content:</label>
        <textarea id="content" name="content" rows="10" required></textarea>
        <br>
        <button type="submit">Send</button>
    </form>
</body>
</html>

在Spring Boot中，可以在Controller中添加以下代码处理发送邮件的请求：

package com.example.controller;

import javax.mail.MessagingException;
import javax.mail.internet.AddressException;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.example.mail.MailUtil;

@Controller
public class MailController {

    @PostMapping("/send")
    public String sendMail(@RequestParam("to") String to,
                           @RequestParam("subject") String subject,
                           @RequestParam("content") String content) {
        try {
            MailUtil.sendMail(to, subject, content);
            return "success";
        } catch (AddressException e) {
            e.printStackTrace();
            return "error";
        } catch (MessagingException e) {
            e.printStackTrace();
            return "error";
        }
    }
}

以上是一个简单的发送邮件的工具类和使用Thymeleaf视图和Spring Boot处理请求的示例。需要注意的是，在实际应用中可能需要对邮件内容进行验证和格式化处理

编写一个发送邮件的工具类后端用spring boot前端用thyme leaf 代码加注释