Java 邮件发送带附件

刺骨的言语ヽ痛彻心扉 2022-05-29 08:19 223阅读 0赞

**我用的是微软azure发送的**

email.properties

#如果是qq邮箱的话是 smtp.qq.com
    host=smtp.sendgrid.net
    #qq邮箱是 465
    port=587
    userName=azure帐号
    #qq邮箱的话是授权码，而不是邮箱密码
    password=密码
    from=azure帐号
    to=收件人帐号

pom.xml

<dependency>
                <groupId>javax.mail</groupId>
                <artifactId>mail</artifactId>
                <version>1.4.2</version>
            </dependency>

MailAuthenticator.java

import javax.mail.PasswordAuthentication;
    
    public class MailAuthenticator extends Authenticator { 
        private String username;
        private String password;
    
        public MailAuthenticator() {
        }
    
        public MailAuthenticator(String username, String password) {
            this.username = username;
            this.password = password;
        }
    
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
        }
    
    }

MailInfo.java

import java.security.GeneralSecurityException;
    import java.util.Properties;
    
    
    public class MailInfo { 
    
        private String host;// 邮件服务器域名或IP
        private String mailPort;
        private String from;// 发件人
        private String to;// 收件人
        private String cc;// 抄送人
        private String username;// 发件人用户名
        private String password;// 发件人密码
        private String title;// 邮件的主题
        private String content;// 邮件的内容
        private String[] attachFileNames;//邮件附件的文件名
    
        /** * 获取邮件参数 * * @return * @throws GeneralSecurityException */
        public Properties getProperties() throws GeneralSecurityException {
            Properties props = new Properties();
            props.put("mail.smtp.host", getHost());
            props.put("mail.smtp.port", getMailPort());
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.starttls.enable", "true");
          /** 如果用的qq邮箱，下面的注释放开 */
    // MailSSLSocketFactory sslSF = new MailSSLSocketFactory();
    // sslSF.setTrustAllHosts(true);
    // props.put("mail.smtp.ssl.enable", "true");
    // props.put("mail.smtp.ssl.socketFactory", sslSF);
            props.put("mail.transport.protocol", "smtp");
    
            props.put("mail.user", getUsername());
            props.put("mail.password", getPassword());
            return props;
        }
    
        public String getMailPort() {
            return mailPort;
        }
    
        public void setMailPort(String mailPort) {
            this.mailPort = mailPort;
        }
    
        public String[] getAttachFileNames() {
            return attachFileNames;
        }
    
        public void setAttachFileNames(String[] attachFileNames) {
            this.attachFileNames = attachFileNames;
        }
    
        public String getHost() {
            return host;
        }
    
        public void setHost(String host) {
            this.host = host;
        }
    
        public String getFrom() {
            return from;
        }
    
        public void setFrom(String from) {
            this.from = from;
        }
    
        public String getTo() {
            return to;
        }
    
        public void setTo(String to) {
            this.to = to;
        }
    
        public String getCc() {
            return cc;
        }
    
        public void setCc(String cc) {
            this.cc = cc;
        }
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    
        public String getTitle() {
            return title;
        }
    
        public void setTitle(String title) {
            this.title = title;
        }
    
        public String getContent() {
            return content;
        }
    
        public void setContent(String content) {
            this.content = content;
        }
    }

EmailSender.java

import com.example.util.PropertiesUtils;
    import com.example.util.StringUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import javax.activation.DataHandler;
    import javax.activation.FileDataSource;
    import javax.mail.*;
    import javax.mail.internet.*;
    import java.util.Calendar;
    import java.util.Properties;
    
    
    public class EmailSender { 
    
        private static final Logger LOGGER = LoggerFactory.getLogger(EmailSender.class);
    
        private static class EmailSenderInstance { 
            private static EmailSender instance = new EmailSender();
        }
    
        public static EmailSender getInstance() {
            return EmailSenderInstance.instance;
        }
    
        /** * 以HTML格式发送邮件 * * @param mailInfo 邮件信息 * @return * @throws Exception */
        public boolean sendHtmlMail(MailInfo mailInfo) throws Exception {
    
            // 需要身份认证，创建一个密码验证器
            MailAuthenticator authenticator = new MailAuthenticator(mailInfo.getUsername(), mailInfo.getPassword());
    
            Properties prop = mailInfo.getProperties();
            // 根据邮件会话属性和密码验证器构造一个发送邮件的session
            Session sendMailSession = Session.getDefaultInstance(prop, authenticator);
    
            try {
                // 根据session创建一个邮件消息
                Message mailMessage = new MimeMessage(sendMailSession);
                // 创建邮件发送者地址
                Address from = new InternetAddress(mailInfo.getUsername());
                // 设置邮件消息的发送者
                mailMessage.setFrom(from);
    
                // 创建邮件的接收者地址 to：发送；cc：抄送
                Address[][] maillToArr = getMailToAddress(mailInfo);
    
                // 设置邮件消息的接收者
                if (maillToArr != null && maillToArr[0] != null && maillToArr[0].length > 0) {
                    mailMessage.setRecipients(Message.RecipientType.TO, maillToArr[0]);
                }
    
                if (maillToArr != null && maillToArr[1] != null && maillToArr[1].length > 0) {
                    mailMessage.setRecipients(Message.RecipientType.CC, maillToArr[1]);
                }
    
                // 设置邮件消息的主题
                mailMessage.setSubject(mailInfo.getTitle());
                // 设置邮件消息发送的时间
                mailMessage.setSentDate(Calendar.getInstance().getTime());
    
                // MimeMultipart类是一个容器类，包含MimeBodyPart类型的对象
                Multipart multiPart = new MimeMultipart();
                // 创建一个包含HTML内容的MimeBodyPart
                BodyPart bodyPart = new MimeBodyPart();
                // 设置html邮件消息内容
                bodyPart.setContent(mailInfo.getContent(), "text/html; charset=utf-8");
                multiPart.addBodyPart(bodyPart);
    
                // 添加附件
                String[] attachFileNames = mailInfo.getAttachFileNames();
                if (attachFileNames != null && attachFileNames.length > 0) {
                    for (String attachFile : attachFileNames) {
                        bodyPart = new MimeBodyPart();
                        // 得到数据源
                        // DataSource source = new ByteArrayDataSource(is, "application/msexcel");
                        FileDataSource fds = new FileDataSource(attachFile);
                        // 得到附件本身并放入BodyPart
                        bodyPart.setDataHandler(new DataHandler(fds));
                        bodyPart.setFileName(MimeUtility.encodeText(fds.getName()));
                        // 得到文件名并编码（防止中文文件名乱码）同样放入BodyPart
                        multiPart.addBodyPart(bodyPart);
                    }
                }
    
                // 设置邮件消息的主要内容
                mailMessage.setContent(multiPart);
    
                // 发送邮件(qq邮箱)
                //Transport.send(mailMessage);
    
                // 发送邮件（azure）
                Transport transport = sendMailSession.getTransport();
                // Connect the transport object.
                transport.connect();
                // Send the message.
                transport.sendMessage(mailMessage, mailMessage.getAllRecipients());
                // Close the connection.
                transport.close();
            } catch (Exception e) {
                LOGGER.error("邮件发送失败！", e);
                return false;
            }
    
            return true;
        }
    
        /** * 创建发送邮件列表地址对象 * * @param mailInfo 邮件信息 * @return Address[0]：发送地址数组；Address[1]：抄送地址数组 */
        private Address[][] getMailToAddress(MailInfo mailInfo) {
            Address[] toAdds = null;
            Address[] ccAdds = null;
    
            try {
                String to = mailInfo.getTo();
                if (StringUtils.isBlank(to)) {
                    throw new NullPointerException("邮件的收件人为空！");
                }
                String[] toMails = to.split(";");
                toAdds = new InternetAddress[toMails.length];
                for (int index = 0; index < toMails.length; index++) {
                    toAdds[index] = new InternetAddress(toMails[index]);
                }
    
                String cc = mailInfo.getCc();
                if (!StringUtils.isBlank(cc)) {
                    String[] ccMails = cc.split(";");
                    ccAdds = new InternetAddress[ccMails.length];
                    for (int index = 0; index < ccMails.length; index++) {
                        ccAdds[index] = new InternetAddress(ccMails[index]);
                    }
                }
            } catch (Exception e) {
                LOGGER.error("创建发送邮件列表地址失败！", e);
            }
            Address[][] result = {toAdds, ccAdds};
            return result;
        }
    
        /** * 构建MailInfo对象 * * @return */
        public MailInfo getMailInfo(String title, String content, String[] attachFileNames) {
            PropertiesUtils instance = PropertiesUtils.getInstance("email.properties");
            MailInfo info = new MailInfo();
            info.setHost(instance.getValue("host"));
            info.setMailPort(instance.getValue("port"));
            info.setUsername(instance.getValue("userName"));
            info.setPassword(instance.getValue("password"));
            info.setFrom(instance.getValue("from"));
            info.setTo(instance.getValue("to"));
            info.setTitle(title);
            info.setContent(content);
            // 添加附件
            if (attachFileNames != null) {
                info.setAttachFileNames(attachFileNames);
            }
            return info;
        }
    
        public static void main(String[] args) {
            EmailSender emailSender = EmailSender.getInstance();
            MailInfo mailInfo = emailSender.getMailInfo("Test", "just a test!", new String[]{
       "G://abc.txt"});
            try {
                boolean success = emailSender.sendHtmlMail(mailInfo);
                System.out.println(success);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

PropertiesUtils.java

import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.io.File;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.URISyntaxException;
    import java.util.Map;
    import java.util.Properties;
    
    
    public class PropertiesUtils { 
        private static final Logger logger = LoggerFactory.getLogger(PropertiesUtils.class);
    
        private Properties properties;
    
        private long latest = 0;
    
        private String path;
    
        private ClassLoader classLoader;
    
        private static Map<String, Properties> proMap;
    
        private PropertiesUtils() {
            classLoader = getClass().getClassLoader();
            proMap = MapUtils.newMap();
        }
    
        public void setPath(String path) {
            synchronized (this) {
                this.path = path;
            }
        }
    
        private void load() {
            Properties properties = new Properties();
            InputStream inputStream = null;
            try {
                inputStream = classLoader.getResourceAsStream(path);
                properties.load(inputStream);
                setProperties(properties);
            } catch (IOException e) {
                logger.error("Load properties failure.", e);
            } finally {
                FileUtils.closeIO(inputStream);
            }
        }
    
        public String getValue(String key) {
            if (!isLatest()) {
                load();
            }
            return this.properties.getProperty(key, "");
        }
    
        private boolean isLatest() {
            File file = null;
            try {
                file = new File(classLoader.getResource(path).toURI());
            } catch (URISyntaxException e) {
                logger.error("File not exists.", e);
            }
            long lastModified = file.lastModified();
            boolean isLatest = this.latest == lastModified;
            if (!isLatest) {
                this.latest = lastModified;
            }
            return isLatest;
        }
    
        private void setProperties(Properties properties) {
            synchronized (this) {
                this.properties = properties;
            }
        }
    
        public static PropertiesUtils getInstance(String path) {
            PropertiesUtils instance = PropertiesUtilsInstance.instance;
            if (proMap.get(path) == null) {
                instance.setPath(path);
                instance.load();
                instance.isLatest();
                proMap.put(path, instance.properties);
            } else {
                instance.setProperties(proMap.get(path));
            }
            return instance;
        }
    
        private static class PropertiesUtilsInstance { 
            private static PropertiesUtils instance = new PropertiesUtils();
        }
    }