How to implement the function of sending emails with attachments in Java

This article mainly introduces the Java implementation of the email sending function with attachments in detail. It has certain reference value. Interested friends can refer to it.

The examples in this article share the Java implementation with everyone. The specific code of the email sending function is for your reference. The specific content is as follows

1. You need to import the two email sending jar packages mail.jar and activation.jar. You can search and download them online
2 , you need to set up the relevant mailbox server. I use QQ mailbox. The operation is as follows: open the relevant service and generate the authorization code (will be used in this code).

The code is as follows:

package com.ecg.controller; 
 
import java.io.UnsupportedEncodingException; 
import java.security.GeneralSecurityException; 
import java.util.Properties; 
 
import javax.activation.DataHandler; 
import javax.activation.DataSource; 
import javax.activation.FileDataSource; 
import javax.mail.Authenticator; 
import javax.mail.BodyPart; 
import javax.mail.Message; 
import javax.mail.MessagingException; 
import javax.mail.Multipart; 
import javax.mail.PasswordAuthentication; 
import javax.mail.Session; 
import javax.mail.Transport; 
import javax.mail.internet.InternetAddress; 
import javax.mail.internet.MimeBodyPart; 
import javax.mail.internet.MimeMessage; 
import javax.mail.internet.MimeMultipart; 
import javax.mail.internet.MimeUtility; 
 
import com.sun.mail.util.MailSSLSocketFactory; 
 
/** 
 * 邮件发送 
 * 
 * @author wanglongfei  
 * E-mail: islongfei@gmail.com 
 * @version 2017年8月27日 
 * 
 */ 
public class mailtest { 
 
 
 public static void main(String [] args) throws GeneralSecurityException, UnsupportedEncodingException 
 { 
  // 收件人电子邮箱 
  String to = "2528621082@qq.com"; 
 
  // 发件人电子邮箱 
  String from = "1135237317@qq.com"; 
 
  // 指定发送邮件的主机为 smtp.qq.com 
  String host = "smtp.qq.com"; //QQ 邮件服务器 
 
  // 获取系统属性 
  Properties properties = System.getProperties(); 
 
  // 设置邮件服务器 
  properties.setProperty("mail.smtp.host", host); 
 
  properties.put("mail.smtp.auth", "true"); 
  MailSSLSocketFactory sf = new MailSSLSocketFactory(); 
  sf.setTrustAllHosts(true); 
  properties.put("mail.smtp.ssl.enable", "true"); 
  properties.put("mail.smtp.ssl.socketFactory", sf); 
  // 获取默认session对象 
  Session session = Session.getDefaultInstance(properties,new Authenticator(){ 
   public PasswordAuthentication getPasswordAuthentication() 
   {  //qq邮箱服务器账户、第三方登录授权码 
    return new PasswordAuthentication("1135237317@qq.com", "dgahhkkjrtgafejj"); //发件人邮件用户名、密码 
   } 
  }); 
 
  try{ 
   // 创建默认的 MimeMessage 对象 
   MimeMessage message = new MimeMessage(session); 
 
   // Set From: 头部头字段 
   message.setFrom(new InternetAddress(from)); 
 
   // Set To: 头部头字段 
   message.addRecipient(Message.RecipientType.TO, new InternetAddress(to)); 
 
   // Set Subject: 主题文字 
   message.setSubject("家医康心电诊断结果"); 
 
    // 创建消息部分 
    BodyPart messageBodyPart = new MimeBodyPart(); 
  
    // 消息 
    messageBodyPart.setText("233333333333333"); 
 
    // 创建多重消息 
    Multipart multipart = new MimeMultipart(); 
  
    // 设置文本消息部分 
    multipart.addBodyPart(messageBodyPart); 
  
    // 附件部分 
    messageBodyPart = new MimeBodyPart(); 
    //设置要发送附件的文件路径 
    String filename = "C:/Users/下雨天-lalala/Desktop/家医康心电图/十二导联同步心电图-.png"; 
    DataSource source = new FileDataSource(filename); 
    messageBodyPart.setDataHandler(new DataHandler(source)); 
    
    //messageBodyPart.setFileName(filename); 
    //处理附件名称中文（附带文件路径）乱码问题 
    messageBodyPart.setFileName(MimeUtility.encodeText(filename)); 
    multipart.addBodyPart(messageBodyPart); 
  
    // 发送完整消息 
    message.setContent(multipart ); 
  
    // 发送消息 
    Transport.send(message); 
    System.out.println("Sent message successfully...."); 
   }catch (MessagingException mex) { 
    mex.printStackTrace(); 
   } 
 } 
}

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