SpringBoot整合邮箱

1，开启POP3/SMTP/IMAP服务

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注意：每个邮箱的密码唯一，不要随意分享给他人

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最后就是这个样子了

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2，整合测试

2.1，pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w5.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>2.7.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.sin</groupId>
    <artifactId>mail_massage</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mail_massage</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>8</java.version>
    </properties>
    <dependencies>
        <!-- 短信业务 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.2</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>

        </plugins>
    </build>
</project>

2.2，application.yml

spring:
  mail:
    # 配置SMTP服务器地址
    host: smtp.126.com
    # 配置端口号465或者25
    port: 25
    # 发送者邮箱（根据自己邮箱填写）
    username: sin8023@126.com
    #  配置密码，注意是开启POP3/SMTP的授权密码(根据自己的授权密码填写)
    password: SZBSI****HNYAA*

    properties:
      mail:
        smtp:
          auth: true
          enable: true
          ssl:
            # 设为true时 端口号设为 465 设为false时 端口号设为25
            enable: false
          socketFactoryClass: javax.net.ssl.SSLSocketFactory
        #表示开启 DEBUG 模式，这样，邮件发送过程的日志会在控制台打印出来，方便排查错误
        debug: true
    # 邮箱编码格式
    default-encoding: UTF-8

2.3，MailService.java

package com.sin.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 8:50
 * @description
 */
@Service
public class MailService {
    @Autowired(required = false)
    private JavaMailSender mailSender;

    @Value("${spring.mail.username")
    private String userName;

    /**
     *
     * @param to 收件人
     * @param subject 邮箱标题
     * @param content 邮箱内容
     * @throws MessagingException
     */
    public void sendMail(String to, String subject, String content) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        //邮箱发送者
        helper.setFrom(userName);
        //收件人，可以为多个收件人，收件人之间用逗号隔开
        helper.setTo(to);
        // 邮箱标题
        helper.setSubject(subject);
        // 邮箱内容
        helper.setText(content, true);
        mailSender.send(message);
    }
}

2.4，MailController.java

package com.sin.controller;

import com.sin.service.MailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.mail.MessagingException;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 8:50
 * @description
 */
@RestController
public class MailController {

    @Autowired
    private MailService mailService;

    @GetMapping("/sendMail")
    public String sendMail() {
        try {
            mailService.sendMail("1824368699@qq.com", "测试邮箱", "使用SpringBoot整合邮箱发送消息");
            return "邮件发送成功";
        } catch (MessagingException e) {
            e.printStackTrace();
            return "邮件发送失败";
        }
    }

}

2.5，测试

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2.6，查看结果

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3，发送附件

3.1，MailFileServier.java

package com.sin.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 10:03
 * @description
 */
@Service
public class MailFileServier {

    @Autowired(required = false)
    private JavaMailSender mailSender;

    @Value("${spring.mail.username}")
    private String userName;

    /**
     *
     * @param to 收件人
     * @param subject 邮箱标题
     * @param content 邮箱内容
     * @throws MessagingException
     */
    public void sendMail(String to, String subject, String content, String imgName, File file) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        //邮箱发送者
        helper.setFrom(userName);
        //收件人，可以为多个收件人，收件人之间用逗号隔开
        helper.setTo(to);
        // 邮箱标题
        helper.setSubject(subject);
        // 邮箱内容
        helper.setText(content, true);

        helper.addAttachment(imgName,file);
        mailSender.send(message);
    }
}

3.2，MailFileController.java

package com.sin.controller;

import com.sin.service.MailFileServier;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.mail.MessagingException;
import java.io.File;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 10:05
 * @description
 */
@RestController
public class MailFileController {


    @Autowired
    private MailFileServier mailFileServier;

    @GetMapping("/sendFile")
    public String sendMail() {
        try {
            mailFileServier.sendMail("1824368699@qq.com", "测试邮箱", "使用SpringBoot整合邮箱发送消息",
                    "sql作业.txt" ,new File("E:\\SQL默写.txt"));
            return "邮件发送成功";
        } catch (MessagingException e) {
            e.printStackTrace();
            return "邮件发送失败";
        }
    }
}

3.3，测试

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4，发送图片

4.1，MailImgServier.java

package com.sin.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 10:21
 * @description
 */
@Service
public class MailImgService {

    @Autowired(required = false)
    private JavaMailSender mailSender;

    @Value("${spring.mail.username}")
    private String userName;

    /**
     *
     * @param to 收件人
     * @param subject 邮箱标题
     * @param content 邮箱内容
     * @throws MessagingException
     */
    public void sendMail(String to, String subject, String content, String imgName, FileSystemResource file) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        //邮箱发送者
        helper.setFrom(userName);
        //收件人，可以为多个收件人，收件人之间用逗号隔开
        helper.setTo(to);
        // 邮箱标题
        helper.setSubject(subject);
        // 邮箱内容
        helper.setText(content, true);

        helper.addInline(imgName,file);
        mailSender.send(message);
    }
}

4.2，MailImgController.java

package com.sin.controller;

import com.sin.service.MailFileServier;
import com.sin.service.MailImgService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.mail.MessagingException;
import java.io.File;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 10:21
 * @description
 */
@RestController
public class MailImgController {


    @Autowired
    private MailImgService mailImgServier;

    @GetMapping("/sendImg")
    public String sendMail() {
        try {
            mailImgServier.sendMail("1824368699@qq.com", "测试邮箱",
                    "<h1>使用SpringBoot发送图片到邮箱</h1><p>图片：</p><img src='cid:img1'/>",
                    "img1" ,new FileSystemResource(new File("F:\\Users\\sin\\Pictures\\2.jpg")));
            return "邮件发送成功";
        } catch (MessagingException e) {
            e.printStackTrace();
            return "邮件发送失败";
        }
    }
}

4.3，测试

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5，随机验证码

5.1，导入thymeleaf模板

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- Java提供的工具库 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>5.9</version>
</dependency>

5.2，application.yml

## thymeleaf模板设置
spring:
    thymeleaf:
      prefix: classpath:/templates/
      suffix: .html
      mode: HTML
      encoding: utf-8
      servlet.content-type: text/html
      check-template-location: true  #检查模板路径是否存在
      cache: false

5.3，RandomCodeUtil.java

package com.sin.util;

import org.apache.commons.lang5.RandomStringUtils;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 9:26
 * @description 生成随机验证码
 * 使用了Apache Commons Lang库中的RandomStringUtils类来生成随机数字字符串。
 */
public class RandomCodeUtil {

    public static String generateCode(int length){
        return RandomStringUtils.randomNumeric(length);
    }
}

5.4，EmailCodeService.java

package com.sin.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 9:29
 * @description
 */
@Service
public class EmailCodeService {

    @Autowired(required = false)
    private JavaMailSender mailSender;

    @Value("${spring.mail.username}")
    private String userName;

    public void sendSimpleMessage(String to, String subject, String text) {
        SimpleMailMessage message = new SimpleMailMessage();
        //邮箱发送者
        message.setFrom(userName);
        //收件人，可以为多个收件人，收件人之间用逗号隔开
        message.setTo(to);
        // 邮箱标题
        message.setSubject(subject);
        // 邮箱内容
        message.setText(text);
        mailSender.send(message);
    }
}

5.5，EmailCodeController.java

package com.sin.controller;

import com.sin.service.EmailCodeService;
import com.sin.util.RandomCodeUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @CreateName SIN
 * @CreateDate 2023/06/27 9:30
 * @description
 */
@Controller
public class EmailCodeController {

    @Autowired
    private EmailCodeService emailCodeService;


    @GetMapping("/login")
    public String home(Model model) {
        // 生成6位随意验证码
        String code = RandomCodeUtil.generateCode(6);
        emailCodeService.sendSimpleMessage("1824368699@qq.com", "验证码", code);
        model.addAttribute("code", code);
        return "login.html";
    }

}