Java实现邮箱发送（Springboot）_java邮件发送功能平台

1. 导入pom.xml 依赖

        <!--spring boot web的依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 
        <!-- mail 依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
 
        <!--thymeleaf模版依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
 
        <!--freemarker模版依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
 
        <!-- Lombok工具 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.4</version>
            <scope>provided</scope>
        </dependency>

2. application.yml

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: xxxxxx@qq.com # 配置邮箱用户名(你的邮箱地址)
    password: xxxxxxxxx # 配置申请到的授权码(第6步教程复制的授权码)
    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: xxxxxxxx@qq.com # 发送方邮件，配在yml中可方便更改（你的邮箱）

3. EmailService接口

import java.io.File;
 
public interface EmailService {
 
    /**
     * 发送文本/简单的邮件
     * @param receiverName 接收人
     * @param title 标题
     * @param content 内容
     */
    void sendStringEmail(String receiverName, String title, String content);
 
    /**
     * 发送大文件/附件的邮件
     * @param receiverName
     * @param title
     * @param content
     * @param file 文件
     */
    void sendBigEmail(String receiverName, String title, String content, File file);
 
    /**
     * 发送模版邮件
     * @param receiverName
     * @param title
     * @param information 模版参数名(html页面)
     */
    void sendTemplateEmail(String receiverName, String title, String information);
}

 4. EmailServiceImpl 实现类

import com.example.email.emaill.EmailConfig;
import com.example.email.service.EmailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
 
import javax.mail.internet.MimeMessage;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
 
@Service
public class EmailServiceImpl implements EmailService {
 
    @Autowired
    private EmailConfig emailConfig;
 
    @Autowired
    private JavaMailSender javaMailSender;
 
    @Autowired
    private TemplateEngine templateEngine;
 
//    @Autowired
//    private FreeMarkerConfigurer markerConfigurer;
 
    //发送文本/简单的邮件
    @Override
    public void sendStringEmail(String receiverName, String title, String content) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(emailConfig.getEmailFrom());
        message.setTo(receiverName);
        message.setSubject(title);
        message.setText(content);
        javaMailSender.send(message);
    }
 
    //发送大文件/附件的邮件
    @Override
    public void sendBigEmail(String receiverName, String title, String content, File file) {
        MimeMessage message = javaMailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(message,true);
            helper.setFrom(emailConfig.getEmailFrom());
            helper.setTo(receiverName);
            helper.setSubject(title);
            helper.setText(content);
            FileSystemResource resource = new FileSystemResource(file);
            helper.addAttachment("附件", resource);
        }catch (Exception e){
            e.printStackTrace();
        }
        javaMailSender.send(message);
    }
 
    //发送模版邮件
    @Override
    public void sendTemplateEmail(String receiverName, String title, String information) {
        MimeMessage message = javaMailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(message,true);
            helper.setFrom(emailConfig.getEmailFrom());
            helper.setTo(receiverName);
            helper.setSubject(title);
            //封装模版使用的数据
            Map<String,Object> map = new HashMap<>();
            map.put("username","明世隐");
 
            //1.FreeMarker
            //1-1 获取FreeMarker模版
            //Template markertemplate = markerConfigurer.getConfiguration().getTemplate(information);
            //1-2 将模版内容转为字符串类型并将参数传入
            //String markertTtml = FreeMarkerTemplateUtils.processTemplateIntoString(markertemplate, map);
            //1-3 将字符串作为邮件内容
            //helper.setText(markertTtml,true);
 
            //2.Thymeleaf
            //2-1 获取Thymeleaf模版
            Context context = new Context();
            context.setVariable("username","瑶");
            //2-2 将模版内容转为字符串类型并将参数传入
            String thymeleafHtml = templateEngine.process("thymeleafTemplate", context);
            helper.setText(thymeleafHtml,true);
 
        }catch (Exception e){
            e.printStackTrace();
        }
 
        javaMailSender.send(message);
    }
 
}

6. 获取授权码

6.1 点击设置 

6.2 账户 ->  POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务

6.3 管理服务

 6.4 生成授权码

 6.5 微信登录发完短信验证就可以生成授权码了