<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.itheima</groupId>
    <artifactId>chapter091</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
    </parent>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        <!-- 邮件服务依赖启动器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

package com.itheima.service;

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

@Service
public class SendEmailService {

    @Autowired
    private JavaMailSenderImpl mailSender;

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

    /**
     * 发送纯文本邮件
     * 
     * @param to      收件人地址
     * @param subject 邮件标题
     * @param text    邮件内容
     */
    public void sendSimpleEmail(String to, String subject, String text) {
        // 定制纯文本邮件信息SimpleMailMessage
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(from);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(text);
        try {
            // 发送邮件
            mailSender.send(message);
            System.out.println("纯文本邮件发送成功");
        } catch (MailException e) {
            System.out.println("纯文本邮件发送失败 " + e.getMessage());
            e.printStackTrace();
        }
    }
}

server:
  port: 8088
spring:
  mail:
    host: smtp.qq.com
    port: 587
    username: 1178XXXXX@qq.com
    password: XXXXXXXXX 
    default-encoding: UTF-8
    properties:
      mail: 
        smtp: 
          connectiontimeout: 5000
          timeout: 3000
          writetimeout: 5000

package com.itheima;

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.junit4.SpringRunner;

import com.itheima.service.SendEmailService;

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class ApplicationTest {

    @Autowired
    private SendEmailService sendEmailService;

    @Test
    public void sendSimpleMailTest() {
        String to = "XXXXXXXXX@qq.com";
        String subject = "【纯文本邮件】标题";
        String text = "Spring Boot纯文本邮件发送内容测试.....";
        // 发送简单邮件
        sendEmailService.sendSimpleEmail(to, subject, text);
    }
}