Java中发送邮件

冷不防 2021-12-05 01:23 292阅读 0赞

## 一、添加依赖 ##

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

## 二、修改application.yml ##

spring:
      mail:
        #编码格式
        default-encoding: UTF-8
        #采用QQ邮箱发送邮件
        host: smtp.qq.com
        #发送人配置的用户名
        username: 1073988580@qq.com
        #QQ邮箱中开通的服务密码，不是QQ密码
        password: ************

## 三、代码 ##

package com.zy.socket.util.email;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    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.Component;
    
    import javax.mail.MessagingException;
    import javax.mail.internet.MimeMessage;
    import java.io.File;
    
    /**
     * @program: SpringCloud
     * @description: 邮件发送工具类
     * @author: zhang yi
     * @create: 2019-10-08 10:54
     */
    @Component
    public class EmailUtil {
    
        /**
         * 使用该类的send()方法发送邮件
         */
        @Autowired
        private JavaMailSender mailSender;
    
        @Value("${spring.mail.username}")
        private String fromAddress;
    
        /**
         * 发送文本邮件
         *
         * @param to
         * @param subject
         * @param content
         */
        public void sendSimpleMail(String to, String subject, String content) {
            // 编辑发送邮件的一些信息，有-->发件人地址，收件人地址，邮件标题，邮件正文
            SimpleMailMessage message = new SimpleMailMessage();
            // 发件人地址
            message.setFrom(fromAddress);
            // 收件人地址
            message.setTo(to);
            // 邮件标题
            message.setSubject(subject);
            // 邮件正文
            message.setText(content);
            try {
                mailSender.send(message);
                System.out.println("发送成功！");
            } catch (Exception e) {
                System.out.println("发送失败！");
                System.out.println(e.getMessage());
            }
        }
    
        /**
         * 发送HTML邮件
         *
         * @param to
         * @param subject
         * @param content
         * @throws MessagingException
         */
        public void sendHtmlMail(String to, String subject, String content) throws MessagingException {
            MimeMessage message = mailSender.createMimeMessage();
            // 这里与发送文本邮件有所不同
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(fromAddress);
            helper.setTo(to);
            helper.setSubject(subject);
            // 发送HTML邮件，也就是将邮件正文使用HTML的格式书写
            helper.setText(content, true);
            try {
                mailSender.send(message);
                System.out.println("发送成功！");
            } catch (Exception e) {
                System.out.println("发送失败！");
                System.out.println(e.getMessage());
            }
        }
    
        /**
         * 发送附件邮件
         *
         * @param to       收件人
         * @param subject  标题
         * @param content  内容
         * @param filePath 文件地址
         * @throws MessagingException
         */
        public void sendAttachmentMail(String to, String subject, String content, String filePath) throws MessagingException {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            System.out.println(fromAddress);
            helper.setFrom(fromAddress);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            // 读取文件
            FileSystemResource file = new FileSystemResource(new File(filePath));
            // 取得文件名
            String fileName = file.getFilename();
            //添加附件，可多次调用该方法添加多个附件
            helper.addAttachment(fileName, file);
            try {
                mailSender.send(message);
                System.out.println("发送成功！");
            } catch (Exception e) {
                System.out.println("发送失败！");
                System.out.println(e.getMessage());
            }
        }
    
    }

## 四、测试类 ##

package com.zy.socket;
    
    import com.zy.socket.util.email.EmailUtil;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    import org.thymeleaf.TemplateEngine;
    import org.thymeleaf.context.Context;
    
    import javax.mail.MessagingException;
    /**
     * @program: SpringCloud
     * @description: 测试
     * @author: zhang yi
     * @create: 2019-10-08 11:12
     */
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class TestDemo {
    
        @Autowired
        private EmailUtil mailService;
    
        @Autowired
        private TemplateEngine templateEngine;
    
        @Value("spring.mail.username")
        private String fromAddress;
        @Test
        public void sendSimpleMail() throws MessagingException {
            //编辑邮件内容
            String content="Hello，我正在用SpringBoot给你发邮件，祝你生活愉快！";
            mailService.sendSimpleMail("3517026634@qq.com","我是一封邮件",content);
        }
    
        @Test
        public void sendHtmlMail() throws MessagingException {
            // 编辑HTML内容
            String content="<html>\n"+
                    "<body>\n"+
                    "<h2>Hello!这是一封SpringBoot发送的HTML邮件。</h2>"+
                    "</body>\n"+
                    "</html>";
            mailService.sendHtmlMail("3517026634@qq.com","我是一封邮件",content);
        }
    
        @Test
        public void sendAttachmentMail() throws MessagingException {
            // 文件的路径
            String filePath="C:\\Users\\Administrator\\Desktop\\木马.bat";
            String content="<html>\n"+
                    "<body>\n"+
                    "<h2>你的电脑已经被我攻占，请运行下面的程序，才能确保你电脑的安全，不然我把你电脑文件全删了。。。。哈哈哈哈哈哈</h2>"+
                    "</body>\n"+
                    "</html>";
            for (int i = 0; i < 3; i++) {
                mailService.sendAttachmentMail(
                        "3517026634@qq.com",
                        "您的电脑已中病毒！",
                        content,
                        filePath
                );
            }
    
        }
    
        @Test
        public void TestTemplateMailTest() throws MessagingException {
            //向Thymeleaf模板传值，并解析成字符串,是导这个包import org.thymeleaf.context.Context;
            Context context = new Context();
            context.setVariable("id", "001");
            //这个名字就是html文件的名字
            String emailContent = templateEngine.process("emailTemplate", context);
            mailService.sendHtmlMail(
                    "3517026634@qq.com",
                    "您的电脑已中病毒！",
                    // 邮件正文
                    emailContent);
        }
    }

5、发送模板邮件时，需要写一个html模板界面

<!DOCTYPE html>
    <html lang="en" xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <title>邮件模板</title>
    </head>
    <body>
    您好<p th:text="${id}"></p>，点这个
    <a href="#" th:href="@{http://www.baidu.com/register/{id}(id=${id})}">激活账号</a>
    </body>
    </html>