教程：基于Spring快速开发电子邮件发送功能

在Spring框架的spring-context-support.jar中有对电子邮件发送功能的封装；

基于Spring开发简单省事，而且更稳定。需要mail.jar包支持

 @Component
 public class EmailSendService implements IEmailSendService {
     private String host;
     private String username;
     private String password;

     public boolean sendText(String email[], String title, String text) {
         try {
             JavaMailSenderImpl senderImpl = new JavaMailSenderImpl();
             // 设定mail server
             senderImpl.setHost(this.host);

             // 建立邮件消息
             SimpleMailMessage mailMessage = new SimpleMailMessage();
             // 设置收件人，寄件人 用数组发送多个邮件
             // String[] array = new String[]
             // {"[email protected]","[email protected]"};
             // mailMessage.setTo(array);
             mailMessage.setTo(email);
             mailMessage.setFrom(IDNMailHelper.toIdnAddress(this.username));
             mailMessage.setSubject(title);
             mailMessage.setText(text);

             senderImpl.setUsername(this.username); // 根据自己的情况,设置username
             senderImpl.setPassword(this.password); // 根据自己的情况, 设置password

             Properties prop = new Properties();
             prop.put("mail.smtp.auth", "true"); // 将这个参数设为true，让服务器进行认证,认证用户名和密码是否正确
             prop.put("mail.smtp.timeout", "25000");
             senderImpl.setJavaMailProperties(prop);
             // 发送邮件
             // senderImpl.send(mailMessage);
             senderImpl.send(mailMessage);
             System.out.println(" 邮件发送成功.. ");
             return true;
         } catch (Exception e) {
             e.printStackTrace();
             return false;
         }
     }

     public boolean sendHtml(String email[], String title, String html) {
         try {
             JavaMailSenderImpl senderImpl = new JavaMailSenderImpl();

             // 设定mail server
             senderImpl.setHost(this.host);

             // 建立邮件消息,发送简单邮件和html邮件的区别
             MimeMessage mailMessage = senderImpl.createMimeMessage();
             MimeMessageHelper messageHelper = new MimeMessageHelper(mailMessage);

             // 设置收件人，寄件人
             messageHelper.setTo(email);
             messageHelper.setFrom(this.username);
             messageHelper.setSubject(title);
             // true 表示启动HTML格式的邮件
             messageHelper.setText(html, true);
             senderImpl.setUsername(this.username); // 根据自己的情况,设置username
             senderImpl.setPassword(this.password); // 根据自己的情况, 设置password
             Properties prop = new Properties();
             prop.put("mail.smtp.auth", "true"); // 将这个参数设为true，让服务器进行认证,认证用户名和密码是否正确
             prop.put("mail.smtp.timeout", "25000");
             senderImpl.setJavaMailProperties(prop);
             // 发送邮件
             senderImpl.send(mailMessage);

             System.out.println("邮件发送成功..");
             return true;
         } catch (Exception e) {
             e.printStackTrace();
             return false;
         }
     }

     public void setHost(String host) {
         this.host = host;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public boolean sendText(String email, String title, String text) {
         return this.sendText(new String[]{email}, title, text);
     }

     public boolean sendHtml(String email, String title, String html) {
         return this.sendHtml(new String[]{email}, title, html);
     }

 }

在这里如果不注意会有一个IDN编码问题。我是经历之后在so上找到了相关的解决方法。详见以下代码

可能出现的异常：JavaMail: “Domain contains control or whitespace in string” errormessage because of domain with danish charaters

 public class IDNMailHelper {

     public static String toIdnAddress(String mail) {
         if (mail == null) {
             return null;
         }
         int idx = mail.indexOf('@');
         if (idx < 0) {
             return mail;
         }
         return localPart(mail, idx) + "@" + IDN.toASCII(domain(mail, idx));
     }

     private static String localPart(String mail, int idx) {
         return mail.substring(0, idx);
     }

     private static String domain(String mail, int idx) {
         return mail.substring(idx + 1);
     }

 }