【Java Web】发送邮件 Spring Mail+Thymeleaf

1. 邮箱启用SMTP服务

生成授权码，然后看一下发送邮件服务器及端口。

2. Spring Mail

2.1 在pom中导入jar包

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-mail</artifactId>
			<version>2.1.5.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>com.sun.mail</groupId>
			<artifactId>javax.mail</artifactId>
			<version>1.6.2</version>
		</dependency>

2.2 邮箱参数设置

# MailProperties
spring.mail.host=smtp.qq.com
spring.mail.port=465
spring.mail.username=123456789@qq.com
spring.mail.password=xxxxxxxxxxxx
spring.mail.protocol=smtps
spring.mail.properties.mail.smtp.ssl.enable=true
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

2.3 使用JavaMailSender发送邮件，建立mailClient.java工具类

package com.nowcoder.community.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.Component;

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

@Component
public class MailClient {

    private static final Logger logger = LoggerFactory.getLogger(MailClient.class);

    @Autowired
    private JavaMailSender mailSender;

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

    public void sendMail(String to, String subject, String content) {
        try {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            mailSender.send(helper.getMimeMessage());
        } catch (MessagingException e) {
            logger.error("发送邮件失败:" + e.getMessage());
        }
    }

}

2.4 发邮件测试单元

package com.nowcoder.community;

import com.nowcoder.community.util.MailClient;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.Thymeleaf;
import org.thymeleaf.context.Context;

@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class MailTests {

    @Autowired
    private MailClient mailClient;


    @Test
    public void testTextMail() {
        mailClient.sendMail("接收邮箱@qq.com", "TEST", "Welcome.");
    }



}

3.模板引擎

在测试类中注入模板引擎，使用testHtmlMail方法发送html类型邮件。如果没有收到邮件，一般可以在垃圾箱中找到。

@Autowired
private TemplateEngine templateEngine;

@Test
    public void testHtmlMail(){
        Context context = new Context();
        context.setVariable("username","sunday");

        String content = templateEngine.process("/mail/demo", context);
        System.out.println(content);

        mailClient.sendMail("[email protected]", "Html", content);
    }