javaMailSender 发送邮件，基于Spring Boot
目录
引入依赖
配置文件配置
具体代码
MultipartFile 转 File 工具类
引入依赖
<!--邮件--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-mail</artifactId></dependency><!--日志--><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.25</version><scope>test</scope></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.25</version></dependency><!--工具集--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.12</version></dependency>
配置文件配置
spring:servlet:multipart:max-file-size: 10MBmax-request-size: 50MBmail:host: #填写邮箱服务器地址port: 465 #服务器端口username: #发件人邮箱号password: #邮箱登录密码，或授权码default-encoding: utf-8protocol: smtp #邮件协议test-connection: trueproperties:mail:
# 是否发送正文mime:multipart:allowempty: truesmtp:ssl:enable: truestarttls:enable: truerequired: true
# connectiontimeout: 10000 #建立连接时间限制
# timeout: 10000 #邮件接收时间限制
# wridtetimeout: 10000 #邮件发送时间限制auth: true具体代码
@Service
public class MailService {private Logger logger = LoggerFactory.getLogger(getClass());//提供日志类@Autowiredprivate JavaMailSenderImpl javaMailSender;/*public JavaMailSenderImpl createJavaMailSender(JavaMailSenderImpl javaMailSender) { //依赖注入报红线时可以试试，不管也可以用return this.javaMailSender = new JavaMailSenderImpl();}*/public boolean sendMail(Mail mail) {try {/*没有传入发件人，设置默认*/if (StrUtil.isEmpty(mail.getFrom()))mail.setFrom("邮箱号");/* 邮箱号为这种形式时可用该方法，获取别名和邮箱号mail.setFrom("\"别名\" <邮箱号>");InternetAddress internetAddress = new InternetAddress(mail.getFrom());邮箱号 别名mimeMessageHelper.setFrom(internetAddress.getAddress(), internetAddress.getPersonal());*//*没有发件人或收件人*/if (StrUtil.isEmpty(mail.getFrom()) || StrUtil.isEmpty(mail.getTo()))return false;/*创建邮件*/MimeMessage mimeMessage = javaMailSender.createMimeMessage();MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);//true：识别html格式/*发件人*/mimeMessageHelper.setFrom(mail.getFrom());/*收件人*/if (mail.getTo().contains(",") || mail.getTo().contains("，")) {String[] split = null;/*判断收件人邮箱号并拆分*/if (mail.getTo().contains(","))split = mail.getTo().split(",");if (mail.getTo().contains("，"))split = mail.getTo().split("，");/*放入 InternetAddress 类型的list*/ArrayList<InternetAddress> list = new ArrayList<>();for (Iterator<String> iterator = Arrays.stream(split).iterator(); iterator.hasNext(); ) {list.add(new InternetAddress(iterator.next()));}/*转 InternetAddress 数组*/InternetAddress[] addresses = list.toArray(new InternetAddress[list.size()]);mimeMessageHelper.setTo(addresses);} elsemimeMessageHelper.setTo(mail.getTo());/*发送时间*/mimeMessageHelper.setSentDate(new Date());/*主题*/mimeMessageHelper.setSubject(mail.getSubject());/*正文*/if (mail.getFiles() != null) {/*正文包含图片*/int i = 0;for (MultipartFile multipartFile : mail.getFiles()) {++i;mimeMessageHelper.setText(mail.getText() + "<div><img src='cid:" + i + "'/></div>", true);File file = multipartFileToFile.multipartFileToFiles(multipartFile);/* MultipartFile 转 File */mimeMessageHelper.addInline(StrUtil.toString(i), new FileSystemResource(file));}} elsemimeMessageHelper.setText(mail.getText());/*正文需发送html时*//*String property = System.getProperty("user.dir");//获取当前项目路径SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日");String time = simpleDateFormat.format(System.currentTimeMillis());StringBuffer stringBuffer = new StringBuffer();stringBuffer.append("<!DOCTYPE html><html lang=\"en\"><head><meta charset=\"UTF-8\"><title>邮件正文模板</title></head><body>\n" +"<div style=\"margin:0 auto;width:700px;height:500px\">\n" +"<img src=\"cid:background.jpg\" style=\"width: 700px;\"/>\n" +"<div style=\"margin:-600px 80px 0 170px;font-size:20px;\">\n" +"<p style=\"color:mediumvioletred;\">周星星：</p>\n" +"<p style=\"color:deeppink;\">\n" +"人生的成功有千百种，您用劳动书写光荣，您用真情善待家人！今天是您的生日，请把心放松，静静地聆听我们的祝福：快乐、健康、幸福。\n" +"</p>\n" +"<p id=\"date\" style=\"text-align:right;margin-right: 100px\">" + time + "</p>\n" +"</div>\n" +"</div>\n" +"</body></html>");mimeMessageHelper.setText(stringBuffer.toString(), true);mimeMessageHelper.addInline("background.jpg", new File(property + "/src/main/resources/img/background.jpg"));*//*附件*/if (mail.getMultipartFiles() != null) {for (MultipartFile multipartFile : mail.getMultipartFiles()) {mimeMessageHelper.addAttachment(multipartFile.getOriginalFilename(), multipartFile);}}/*发送*/javaMailSender.send(mimeMessage);logger.info("发送成功：{}--->{}", mail.getFrom(), mail.getTo());return true;} catch (Exception e) {e.printStackTrace();logger.debug("发送失败：{}--->{}", mail.getFrom(), mail.getTo());return false;}}
}
MultipartFile 转 File 工具类
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;@Component
public class MultipartFileToFile {/*** MultipartFile 转 File** @param file* @throws Exception*/public File multipartFileToFiles(MultipartFile file) throws Exception {File toFile = null;if (file.equals("") || file.getSize() <= 0) {file = null;} else {InputStream ins = null;ins = file.getInputStream();toFile = new File(file.getOriginalFilename());inputStreamToFile(ins, toFile);ins.close();}return toFile;}//获取流文件private void inputStreamToFile(InputStream ins, File file) {try {OutputStream os = new FileOutputStream(file);int bytesRead = 0;byte[] buffer = new byte[8192];while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {os.write(buffer, 0, bytesRead);}os.close();ins.close();} catch (Exception e) {e.printStackTrace();}}/*** 删除本地临时文件** @param file*/public void delteTempFile(File file) {if (file != null) {File del = new File(file.toURI());del.delete();}}}Cheung Kwok Wing 随笔