使用JAVA实现邮件发送功能的图文教程

<!--邮件发送依赖-->
<dependency>
   	<groupId>org.springframework.boot</groupId>
   	<artifactId>spring-boot-starter-mail</artifactId>
</dependency>

spring: 
  # 发送邮件配置
  mail:
    host: smtp.qq.com # 配置 smtp 服务器地址
    port: 587 # smtp 服务器的端口
    username: 1354720889@qq.com # 配置邮箱用户名(你的邮箱地址)
    passWord: batrgddaqykegfss # 配置申请到的授权码(刚让复制的授权码)
    default-encoding: UTF-8 # 配置邮件编码
    properties:
      mail:
        smtp:
          SocketFactoryClass: javax.net.ssl.SSLSocketFactory # 配饰 SSL 加密工厂
        debug: true
    from: 1354720889@qq.com # 发送方邮件，陪在yml中可方便更改

package com.clover.utils;

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.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Component;

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


@Component
public class EmailUtil {

    @Value("${spring.mail.from}") // 从application.yml配置文件中获取
    private String from; // 发送发邮箱地址

    @Autowired
    private JavaMailSender mailSender;

    
    public void sendMessage(String to, String subject, String content) {
        // 创建一个邮件对象
        SimpleMailMessage msg = new SimpleMailMessage();
        msg.setFrom(from); // 设置发送发
        msg.setTo(to); // 设置接收方
        msg.setSubject(subject); // 设置邮件主题
        msg.setText(content); // 设置邮件内容
        // 发送邮件
        mailSender.send(msg);
    }

    
    public void sendMessageCarryFiles(String to, String subject, String content, File[] files) {
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);
            helper.setFrom(from); // 设置发送发
            helper.setTo(to); // 设置接收方
            helper.setSubject(subject); // 设置邮件主题
            helper.setText(content); // 设置邮件内容
            if (files != null && files.length > 0) { // 添加附件（多个）
                for (File file : files) {
                    helper.addAttachment(file.getName(), file);
                }
            }
        } catch (MessagingException e) {
            e.printStackTrace();
        }
        // 发送邮件
        mailSender.send(mimeMessage);
    }

    public void sendMessageCarryFile(String to, String subject, String content, File file) {
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);
            helper.setFrom(from); // 设置发送发
            helper.setTo(to); // 设置接收方
            helper.setSubject(subject); // 设置邮件主题
            helper.setText(content); // 设置邮件内容
            helper.addAttachment(file.getName(), file); // 单个附件
        } catch (MessagingException e) {
            e.printStackTrace();
        }
        // 发送邮件
        mailSender.send(mimeMessage);
    }

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }
}

package com.clover.api.blogapi;

import com.clover.utils.EmailUtil;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.File;

@SpringBootTest
class BlogApiApplicationTests {
    @Autowired
    private EmailUtil emailUtil;

    @Test
    void contextLoads() {
    }

    @Test
    void sendStringEmail() {
        // 测试文本邮件发送（无附件）
        String to = "1354720990@qq.com";
        String title = "文本邮件发送测试";
        String content = "文本邮件发送测试";
        emailUtil.sendMessage(to, title, content);
    }

    @Test
    void sendFileEmail() {
        // 测试单个附件邮件发送
        String to = "1354720990@qq.com";
        String title = "单个附件邮件发送测试";
        String content = "单个附件邮件发送测试";
        File file = new File("D:\\GCH\\Typora\\linux中常用的查看系统相关信息命令.md");
        emailUtil.sendMessageCarryFile(to, title, content, file);
    }
    
    @Test
    void sendFilesEmail() {
        // 测试多个附件邮件发送
        String to = "1354720990@qq.com";
        String title = "多个附件邮件发送测试";
        String content = "多个附件邮件发送测试";
        File[] files = new File[2];
        files[0] = new File("C:\\Users\\root\\Desktop\\配置邮箱\\1.png");
        files[1] = new File("C:\\Users\\root\\Desktop\\配置邮箱\\2.png");
        emailUtil.sendMessageCarryFile(to, title, content, files);
    }
}