java表单中有附件 java发送附件

需要引入的pom文件（maven仓库直接拿的）

<!-- https://mvnrepository.com/artifact/javax.mail/javax.mail-api -->
<dependency >
    <groupId >javax.mail </groupId >
    <artifactId >mail </artifactId >
    <version >1.4.7 </version >
</dependency >

工具类代码

package com.xx.email;

import com.sun.mail.util.MailSSLSocketFactory;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;
import java.util.Properties;

public class SendEmailFJ {
    

    /**
     * 发送带附件的邮件
     *
     * @param receive  收件人
     * @param subject  邮件主题
     * @param msg      邮件内容
     * @param filename 附件地址
     * @return
     * @throws
     */
    public static boolean sendMail(String receive, String subject, String msg, String filename)
            throws GeneralSecurityException {
        //设置参数
        Properties properties = new Properties();
        properties.put("mail.transport.protocol", "smtp");// 连接协议
        properties.put("mail.smtp.host", "");// 主机名  使用qq邮箱当作主机发送可选择
        properties.put("mail.smtp.port", 465);// 端口号
        properties.put("mail.smtp.auth", "true");//设置认证
        properties.put("mail.smtp.ssl.enable", "true");// 设置是否使用ssl安全连接 ---一般都使用
        properties.put("mail.debug", "true");// 设置是否显示debug信息 true 会在控制台显示相关信息
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.socketFactory", sf);
        // 得到回话对象
        Session session = Session.getInstance(properties);
        try {
            // 创建默认的 MimeMessage 对象
            MimeMessage message = new MimeMessage(session);
            // Set From: 发件人
            message.setFrom(new InternetAddress("xxxxxx@"));
            // Set To: 收件人
            String[] strings = receive.split(",");
            //将收件人信息通过‘,’拆分多个邮件地址
            InternetAddress[] internetAddresses = new InternetAddress[strings.length];
            for (int i = 0; i < strings.length; i++) {
                internetAddresses[i] = new InternetAddress(strings[i]);
            }
            //添加收件人信息
            message.setRecipients(,internetAddresses);
            // Set Subject: 主题文字
            message.setSubject(subject);
            // 创建消息部分
            BodyPart messageBodyPart = new MimeBodyPart();
            // 消息
            messageBodyPart.setText(msg);
            // 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
            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);
            Transport transport = session.getTransport();
            transport.connect("发送人的账户信息", "这里写入qq邮箱的授权码");
            // 发送消息
            transport.sendMessage(message,message.getAllRecipients());
            transport.close();
            System.out.println("发送成功！");
            return true;
        } catch (MessagingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return false;
    }
}

 测试代码

public static void main(String[] args) {
    //发送多个联系人 以','隔开
    String receive="xxxxxxxx@";
    String subject ="邮件主题";
    String msg ="邮件内容";
    //附件路径
    String filename ="D:\\test.png";
    try {
        SendEmailFJ.sendMail(receive, subject, msg, filename);
    } catch (GeneralSecurityException e) {
        e.printStackTrace();
    }
}