java程式碼傳送郵件例項以qq郵箱為例

一、郵箱設定

qq郵件賬戶設定裡要開啟這個，開啟的時候會獲得一個16位的郵件授權碼（需要簡訊認證）

二、依賴的包pom.xml

<!--傳送郵件需要的依賴-->
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.7</version>
        </dependency>

三、程式碼

package com.example.demo.mail;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
 
import java.util.Properties;
import com.sun.mail.util.MailSSLSocketFactory;
import javax.mail.*;
import javax.mail.internet.MimeMultipart;
import java.security.GeneralSecurityException;


public class SendEmail {

    //郵件傳送主方法
    public static void main(String[] args)  {

        try {
            //不帶附件的郵件傳送
 

            simpleSend("smtp.qq.com","[email protected]","fsfxxxxxxxxxxhbe","[email protected]","Hello Mail",
                    "我的想法是把程式碼放進一個迴圈裡");
        } catch (MessagingException e) {
            e.printStackTrace();
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        }

        try {
            //帶附件的郵件傳送
            complexEmail("smtp.qq.com","[email protected]","fsfxxxxxxxxxxhbe","[email protected]","帶圖片和附件的郵件",
                    "帶附件的郵件","E:\\1.jpg","2.jpg");
        } catch (MessagingException e) {
            e.printStackTrace();
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        }
    }

    /*
      傳送沒有附件的郵件
      smtpService：郵件伺服器
      sendEmail：傳送郵件
      password：郵件授權碼
      receiveEmail：接收郵件地址
      emailTitle：郵件主題
      emailText：郵件內容
     */
    public static void simpleSend(String smtpService,String sendEmail,String password ,String receiveEmail,
                                  String emailTitle,String emailText) throws MessagingException, GeneralSecurityException{
        //建立一個配置檔案並儲存
        Properties properties = new Properties();
        properties.setProperty("mail.host",smtpService);
        properties.setProperty("mail.transport.protocol","smtp");
        properties.setProperty("mail.smtp.auth","true");
        //QQ存在一個特性設定SSL加密
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.ssl.socketFactory", sf);
        //建立一個session物件
        Session session = Session.getDefaultInstance(properties, new Authenticator() {

        });
        //開啟debug模式
        session.setDebug(true);
        //獲取連線物件
        Transport transport = session.getTransport();
        //連線伺服器
        transport.connect(smtpService,sendEmail,password);
        //建立郵件物件
        MimeMessage mimeMessage = new MimeMessage(session);
        //郵件傳送人
        mimeMessage.setFrom(new InternetAddress(sendEmail));
        //郵件接收人
        mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress(receiveEmail));
        //郵件標題
        mimeMessage.setSubject(emailTitle);
        //郵件內容
        mimeMessage.setContent(emailText,"text/html;charset=UTF-8");
        //傳送郵件
        transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients());
        //關閉連線
        transport.close();
    }



        /*
            帶附件的郵件傳送
            smtpService：郵件伺服器
            sendEmail：傳送郵件
            password：郵件授權碼
            receiveEmail：接收郵件地址
            emailTitle：郵件主題
            emailText：郵件內容
         */
        public static void complexEmail( String smtpService,String sendEmail,String password ,String receiveEmail,
                                                String emailTitle,String emailText,String filePath,String fileName) throws MessagingException,
                GeneralSecurityException, MessagingException {

            Properties prop = new Properties();
            prop.setProperty("mail.host", smtpService);  //設定QQ郵件伺服器
            prop.setProperty("mail.transport.protocol", "smtp"); // 郵件傳送協議
            prop.setProperty("mail.smtp.auth", "true"); // 需要驗證使用者名稱密碼

            // QQ郵箱設定SSL加密
            MailSSLSocketFactory sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);
            prop.put("mail.smtp.ssl.enable", "true");
            prop.put("mail.smtp.ssl.socketFactory", sf);

            //1、建立定義整個應用程式所需的環境資訊的 Session 物件
            Session session = Session.getDefaultInstance(prop, new Authenticator() {});

            //2、通過session獲取transport物件
            Transport transport = session.getTransport();

            //3、通過transport物件郵箱使用者名稱和授權碼連線郵箱伺服器
            transport.connect("smtp.qq.com",sendEmail,password);

            //4、建立郵件,傳入session物件
            //訊息的固定資訊
            MimeMessage mimeMessage = new MimeMessage(session);
            //發件人
            mimeMessage.setFrom(new InternetAddress(sendEmail));
            //收件人
            mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress(receiveEmail));
            //郵件標題
            mimeMessage.setSubject(emailTitle);

            //郵件內容
            MimeBodyPart mimeBody = new MimeBodyPart();
            DataHandler handler = new DataHandler(new FileDataSource(filePath));
            mimeBody.setDataHandler(handler);
            //準備文字
            MimeBodyPart text = new MimeBodyPart();
            //5,郵件內容
            text.setContent(emailText,"text/html;charset=utf-8");

            //拼裝郵件正文
            MimeMultipart mimeMultipart = new MimeMultipart();
            mimeMultipart.addBodyPart(text);
            //將拼裝好的正文內容設定為主體
            MimeBodyPart contentText = new MimeBodyPart();
            contentText.setContent(mimeMultipart);

            //附件
            MimeBodyPart appendix = new MimeBodyPart();
            appendix.setDataHandler(new DataHandler(new FileDataSource(filePath)));
            appendix.setFileName(fileName);

            //拼接附件
            MimeMultipart allFile = new MimeMultipart();
            allFile.addBodyPart(appendix);//附件 傳送多個附件這裡多加幾個就ok
            allFile.addBodyPart(contentText);//正文
            allFile.setSubType("mixed"); //正文和附件都存在郵件中，所有型別設定為mixed

            //放到Message訊息中
            mimeMessage.setContent(allFile);
            mimeMessage.saveChanges();//儲存修改

            //5、傳送郵件
            transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients());

            //6、關閉連線
            transport.close();


        }


}