Java mail 技术实例

妖狐艹你老母 2022-08-10 09:43 150阅读 0赞

> 简单来说,就是java 如何来使用smtp 规范来实现 发邮件的功能,即把
> 
> smtp规范和 邮箱账号/密码,接收方的邮箱，给 mail，让mail自动完成
> 
> 发邮件的功能 。

直接上代码：

package test;
    
    import javax.mail.Authenticator;
    import javax.mail.PasswordAuthentication;
    
    public class Email_Autherticatorbean extends Authenticator { 
        private String m_username = null;
        private String m_userpass = null;
    
        public void setUsername(String username) {
            m_username = username;
        }
    
        public void setUserpass(String userpass) {
            m_userpass = userpass;
        }
    
        public Email_Autherticatorbean(String username, String userpass) {
            super();
            setUsername(username);
            setUserpass(userpass);
    
        }
    
        public PasswordAuthentication getPasswordAuthentication() {
    
            return new PasswordAuthentication(m_username, m_userpass);
        }
    }

**核心程序**

package test;
    
    import java.util.Properties;
    import test.Email_Autherticatorbean;
    import javax.mail.Authenticator;
    import javax.mail.internet.InternetAddress;
    import org.apache.commons.lang.StringUtils;
    import javax.mail.internet.MimeBodyPart;
    import javax.mail.Multipart;
    import javax.activation.FileDataSource;
    import javax.mail.internet.MimeMultipart;
    import javax.activation.DataHandler;
    import javax.mail.internet.MimeUtility;
    import java.util.Date;
    
    /** * 利用java.mail的邮件发送程序 */
    
    public class SendMailTest { 
        public static void main(String[] args) {
            String title = "系统通知";// 所发送邮件的标题
            String from = "xxxxxxxxxxxxxxxxx";// 从那里发送
            String sendTo[] = { "xxxxxxxxxxx@189.cn" };// 发送到那里
            // 邮件的文本内容，可以包含html标记则显示为html页面
            String content = "尊敬的客户:您的验证码是:369852,欢迎加入我们。";
            // 所包含的附件，及附件的重新命名
            String fileNames[] = { "F:\\readme.txt,readme.txt" };
            try {
                // MailSender mailsender = new MailSender();
                sendmail(title, from, sendTo, content, fileNames,
                        "text/html;charset=gb2312");
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    
        public static void sendmail(String subject, String from, String[] to,
                String text, String[] filenames, String mimeType) throws Exception {
            // ResourceBundle mailProps = ResourceBundle.getBundle("mail");
            // 可以从配置文件读取相应的参数
            Properties props = new Properties();
    
            String smtp = "smtp*****"; // 设置发送邮件所用到的smtp
            String servername = "";
            String serverpaswd = "";
    
            javax.mail.Session mailSession; // 邮件会话对象
            javax.mail.internet.MimeMessage mimeMsg; // MIME邮件对象
    
            props = java.lang.System.getProperties(); // 获得系统属性对象
            props.put("mail.smtp.host", smtp); // 设置SMTP主机
            props.put("mail.smtp.auth", "true"); // 是否到服务器用户名和密码验证
            // 到服务器验证发送的用户名和密码是否正确
            Email_Autherticatorbean myEmailAuther = new Email_Autherticatorbean(
                    servername, serverpaswd);
            // 设置邮件会话
            mailSession = javax.mail.Session.getInstance(props,
                    (Authenticator) myEmailAuther);
            // 设置传输协议
            javax.mail.Transport transport = mailSession.getTransport("smtp");
            // 设置from、to等信息
            mimeMsg = new javax.mail.internet.MimeMessage(mailSession);
            if (!StringUtils.isEmpty(from)) {
                InternetAddress sentFrom = new InternetAddress(from);
                mimeMsg.setFrom(sentFrom); // 设置发送人地址
            }
    
            InternetAddress[] sendTo = new InternetAddress[to.length];
            for (int i = 0; i < to.length; i++) {
                System.out.println("发送到:" + to[i]);
                sendTo[i] = new InternetAddress(to[i]);
            }
    
            mimeMsg.setRecipients(javax.mail.internet.MimeMessage.RecipientType.TO,
                    sendTo);
            mimeMsg.setSubject(subject, "gb2312");
    
            MimeBodyPart messageBodyPart1 = new MimeBodyPart();
    
            messageBodyPart1.setContent(text, mimeType);
    
            Multipart multipart = new MimeMultipart();// 附件传输格式
            multipart.addBodyPart(messageBodyPart1);
    
            for (int i = 0; i < filenames.length; i++) {
                MimeBodyPart messageBodyPart2 = new MimeBodyPart();
                // 选择出每一个附件名
                String filename = filenames[i].split(",")[0];
                System.out.println("附件名：" + filename);
                String displayname = filenames[i].split(",")[1];
                // 得到数据源
                FileDataSource fds = new FileDataSource(filename);
                // 得到附件本身并至入BodyPart
                messageBodyPart2.setDataHandler(new DataHandler(fds));
                // 得到文件名同样至入BodyPart
                // messageBodyPart2.setFileName(displayname);
                // messageBodyPart2.setFileName(fds.getName());
                messageBodyPart2.setFileName(MimeUtility.encodeText(displayname));
                multipart.addBodyPart(messageBodyPart2);
            }
            mimeMsg.setContent(multipart);
            // 设置信件头的发送日期
            mimeMsg.setSentDate(new Date());
            mimeMsg.saveChanges();
            // 发送邮件
            transport.send(mimeMsg);
            transport.close();
        }
    
    }

**稍微修改代码,运行即可.**