java实现账号登录时发送邮件通知

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/>
    </parent>
    <groupId>com.example</groupId>
    <artifactId>email</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <properties>
        <java.version>1.8</java.version>
        <lombok.version>1.18.22</lombok.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

package com.example.email.controller;
import com.example.email.config.EmailProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
/**
 * @author heyunlin
 * @version 1.0
 */
@RestController
public class LoginController {
    private final JavaMailSender mailSender;
    @Autowired
    public LoginController(JavaMailSender mailSender) {
        this.mailSender = mailSender;
    }
    @GetMapping("/login")
    public String login(String username, String password) {
        // 定义日期格式
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy年MM月dd日 HH:mm:ss");
        try {
            if (password.equals("12345")) {
                MimeMessage message = mailSender.createMimeMessage();
                MimeMessageHelper helper = new MimeMessageHelper(message);
                helper.setFrom("xxx@163.com"); // 设置发送方的邮箱，这个邮箱要和配置文件里设置的username一致，否则会报错
                helper.setTo(""); // 设置接收方邮箱，发送方和接收方可以是同一个邮箱。
                helper.setText("您的账号" + username + " " + LocalDateTime.now().format(formatter) + "在广州登录了。");
                mailSender.send(message);
                return "登录成功";
            } else {
                return "登录失败，密码不正确。";
            }
        } catch (MessagingException exception) {
            exception.printStackTrace();
            return "登录失败，" + exception.getMessage();
        }
    }
}

server:
  port: 8081
spring:
  mail:
    port: 25
    host: smtp.163.com    # 发送邮件的服务器地址
    default-encoding: UTF-8
    username: xxx@163.com # 你的邮箱
    password: xxx         # 这个是授权码，不是邮箱的密码，下面会介绍怎么去获取