1、進入qq郵箱，設定-開啟IMAP/SMTP，點選開啟，會提示授權碼，記住此時的授權碼 

2、記住這個傳送郵件伺服器的地址。

以上準備工作做完之後，OK，現在開始編碼............

一、首先肯定是導包。

spring-boot-starter-mail

附上pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<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.springboot</groupId>
    <artifactId>scheduled-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>scheduled-demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
            <version>1.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>
 

2、application.yml：配置檔案

username:是你用來發送簡訊的郵箱賬號；

password：就是你的授權碼，並不是你的郵箱密碼

host：是你用來發送郵件的伺服器地址

3、編寫測試類：

 3.1 簡單郵件：純文字

package com.springboot.scheduleddemo;

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.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class ScheduledDemoApplicationTests {

    @Autowired
    JavaMailSenderImpl javaMailSender;

    @Test
    public void SendMail() {
        SimpleMailMessage mailMessage=new SimpleMailMessage();
        //郵件設定
        mailMessage.setSubject("通知：大家放假一天，不要問為什麼，老闆問你，就說是我說的！！");
        mailMessage.setText("明天放假");
        mailMessage.setTo("
 
[email protected]");
        mailMessage.setFrom("[email protected]");
        javaMailSender.send(mailMessage);

    }

}

點選run執行測試類。

OK，此時郵件已經收到了。

 3.2 複雜郵件:帶HTML或者帶附件

  @Test
    public void SendMail2() throws MessagingException {
        //1、建立一個複雜的訊息郵件
        MimeMessage mimeMessage=javaMailSender.createMimeMessage();

        MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);

        //郵件設定
        mimeMessageHelper.setSubject("通知：未來七天放假");
        mimeMessageHelper.setText("<b style='color:red'>2018-10-30開始放假<b/>",true);
        mimeMessageHelper.setTo("
 
[email protected]");
        mimeMessageHelper.setFrom("[email protected]");

        //上傳附件
        mimeMessageHelper.addAttachment("timg.jpg",new File("C:\\Users\\13871\\Desktop\\timg.jpg"));
        mimeMessageHelper.addAttachment("timg (1).jpg",new File("C:\\Users\\13871\\Desktop\\timg (1).jpg"));
        javaMailSender.send(mimeMessage);
    }

ps: 

       mimeMessageHelper.setText("<b style='color:red'>2018-10-30開始放假<b/>",true);這個方法如果需要展示成html,需要將html屬性，並設定為true，否則就會展示成文字了。

可以檢視原始碼：