SpringBoot-Mail 发邮件（单发、群发、加附件、HTML格式）

朱雀 2020-10-17 17:49 931阅读 0赞

我们处理异常通常会写入日志，但我们无法及时知道。如果能够将异常信息发送到邮箱，我们可以在第一时间发现这个异常。除此以外，还可以用来给用户发验证码以及各种离线消息等等。

说明：本Demo是用Springboot + Spring自带的JavaMailSender + QQ邮箱 来发邮件的

JavaMailSender

发纯文本的消息，

还可以发送HTML格式的内容，

而且还可以携带附件，

还支持群发。

--------------------

一、pom.xml中引入依赖

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

application.properties

SMTP授权码

#使用smtp.qq.com的邮件服务器
    spring.mail.host=smtp.qq.com
    #用户名
    spring.mail.username=17***80@qq.com
    #密码,SMTP授权码
    spring.mail.password=ra*******jfg

Controller

package com.example.springBootdemo.controller;
    
    import java.io.PrintWriter;
    import java.io.StringWriter;
    
    import javax.mail.MessagingException;
    import javax.mail.internet.MimeMessage;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.mail.SimpleMailMessage;
    import org.springframework.mail.javamail.JavaMailSender;
    import org.springframework.mail.javamail.JavaMailSenderImpl;
    import org.springframework.mail.javamail.MimeMessageHelper;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    /**
     * 发送邮件Demo
     * 1、单发、发送普通文本
     * 2、单发、发送html格式的内容，并携带附件
     * 3、群发给多个人
     * @author luolei
     * @date 2019年1月30日
     */
    @RestController
    @RequestMapping("/sendmail")
    public class SendMailController{
    	
    	@Autowired
    	private JavaMailSender javaMailSender;
    	/**
    	 * 发送普通文本
    	 * @return
    	 * String
    	 */
    	@RequestMapping("/simple")
    	public String sendMail() {
    		//创建一个SimpleMailMessage对象
    		SimpleMailMessage message = new SimpleMailMessage();
    		//发件人
    		message.setFrom("17***80@qq.com");
    		//收件人
    		message.setTo("17***80@qq.com");
    		message.setSubject("报警消息");
    		try{
    			int a = 1/0;
    		}catch(Exception e){
    			//错误详细信息
    			StringWriter sw = new StringWriter();
    			PrintWriter pw = new PrintWriter(sw, true);
    			e.printStackTrace(pw);
    			pw.flush();
    			sw.flush();
    			message.setText(sw.toString());
    			javaMailSender.send(message);
    			return "邮件发送成功";
    		}
    		return "邮件发送失败";
    	}
    	/**
    	 * 发送html格式的内容，并携带附件
    	 * @return
    	 * @throws MessagingException
    	 * String
    	 */
    	@RequestMapping("/enclosure")
    	public String sendMail2() throws MessagingException {
    		//创建一个SimpleMailMessage对象
    		MimeMessage mimeMessage = javaMailSender.createMimeMessage();
    		//需要创建一个MimeMessageHelper对象，相关参数和简单邮件类似
    		MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
    		//发件人
    		helper.setFrom("17***80@qq.com");
    		//收件人
    		helper.setTo("17***80@qq.com");
    		helper.setSubject("报警消息");
    		//将邮件内容设置为html格式
    		try{
    			int a = 1/0;
    		}catch(Exception e){		
    			//错误详细信息
    			StringWriter sw = new StringWriter();
    			PrintWriter pw = new PrintWriter(sw, true);
    			e.printStackTrace(pw);
    			pw.flush();
    			sw.flush();
    			helper.setText("<html><body><p style='color:red;'>"+ sw.toString() +"</p></body></html>", true);
    			//定义文件，这是classpach路径下的也就是java.main.resources下的文件load4.gif
    			ClassPathResource file = new ClassPathResource("static/img/loading/load4.gif");
    			//添加附件文件， 设置文件名为error.gif
    			helper.addAttachment("error.gif", file);
    			javaMailSender.send(mimeMessage);
    			return "邮件发送成功";
    		}
    		return "邮件发送失败";
    	}
    	/**
    	 * 群发给多个人
    	 * @return
    	 * @throws MessagingException
    	 * String
    	 */
    	@RequestMapping("/group")
    	public String sendMail3() throws MessagingException {
    		//用户组
    		String users[] = {"17***80@qq.com","10***27@qq.com"};
    		//创建一个SimpleMailMessage对象
    		SimpleMailMessage message = new SimpleMailMessage();
    		//发件人
    		message.setFrom("17***80@qq.com");
    		//收件人
    		message.setTo(users); // 群发
    		try{
    			int a = 1/0;
    		}catch(Exception e){
    			//错误详细信息
    			StringWriter sw = new StringWriter();
    			PrintWriter pw = new PrintWriter(sw, true);
    			e.printStackTrace(pw);
    			pw.flush();
    			sw.flush();
    			message.setText(sw.toString());
    			javaMailSender.send(message);
    			return "邮件群发送成功";
    		}
    		return "邮件群发送失败";
    	}
    
    }

测试

[http://localhost:8080/sendmail/simple][http_localhost_8080_sendmail_simple]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NzZG5sdW9sZWk_size_16_color_FFFFFF_t_70][]

[http://localhost:8080/sendmail/enclosure][http_localhost_8080_sendmail_enclosure]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NzZG5sdW9sZWk_size_16_color_FFFFFF_t_70 1][]

[http://localhost:8080/sendmail/group][http_localhost_8080_sendmail_group]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NzZG5sdW9sZWk_size_16_color_FFFFFF_t_70 2][]

[http_localhost_8080_sendmail_simple]: http://localhost:8080/sendmail/simple
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NzZG5sdW9sZWk_size_16_color_FFFFFF_t_70]: /images/1602956947493.png
[http_localhost_8080_sendmail_enclosure]: http://localhost:8080/sendmail/enclosure
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NzZG5sdW9sZWk_size_16_color_FFFFFF_t_70 1]: /images/1602956932612.png
[http_localhost_8080_sendmail_group]: http://localhost:8080/sendmail/group
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NzZG5sdW9sZWk_size_16_color_FFFFFF_t_70 2]: /images/1602956915665.png