Java实现批量发送带附件的邮件代码

package Email;

public class EmailParameter {
    //发信邮箱
    private String fromMailbox;
    //发信邮箱密码(独立邮箱填写密码,163或qq等第三方邮箱填写授权码)
    private String fromMailboxPWD;
    //收信邮箱
    private String toMailbox;
    //附件在本机下的目录路径
    private String enclosurePath;
    //邮箱主机(如QQ邮箱是smtp.qq.com、163邮箱是smtp.163.com)
    private String host;
    //与上一次发送邮件间隔时间 默认5秒
    private long sleepTime = 5000;
    //邮件发送成功后给本地文件打的成功标识
    private String successTag;
 
    public String getSuccessTag() {
        return successTag;
    }
 
    public void setSuccessTag(String successTag) {
        this.successTag = successTag;
    }
 
    public String getFromMailbox() {
        return fromMailbox;
    }
 
    public void setFromMailbox(String fromMailbox) {
        this.fromMailbox = fromMailbox;
    }
 
    public String getFromMailboxPWD() {
        return fromMailboxPWD;
    }
 
    public void setFromMailboxPWD(String fromMailboxPWD) {
        this.fromMailboxPWD = fromMailboxPWD;
    }
 
    public String getToMailbox() {
        return toMailbox;
    }
 
    public void setToMailbox(String toMailbox) {
        this.toMailbox = toMailbox;
    }
 
    public String getEnclosurePath() {
        return enclosurePath;
    }
 
    public void setEnclosurePath(String enclosurePath) {
        this.enclosurePath = enclosurePath;
    }
 
    public String getHost() {
        return host;
    }
 
    public void setHost(String host) {
        this.host = host;
    }
 
    public long getSleepTime() {
        return sleepTime;
    }
 
    public void setSleepTime(long sleepTime) {
        this.sleepTime = sleepTime;
    }
 
    @Override
    public String toString() {
        return "EmailParameter{" +
                "fromMailbox='" + fromMailbox + '\'' +
                ", fromMailboxPWD='" + fromMailboxPWD + '\'' +
                ", toMailbox='" + toMailbox + '\'' +
                ", enclosurePath='" + enclosurePath + '\'' +
                ", host='" + host + '\'' +
                ", sleepTime=" + sleepTime +
                ", successTag='" + successTag + '\'' +
                '}';
    }
}

package Email;
 
import com.sun.mail.util.MailSSLSocketFactory;
import org.springframework.util.StringUtils;
 
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.File;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EmailsServiceImpl {
    public String sendEmails(EmailParameter parameter){
        if(!this.isMailbox(parameter.getFromMailbox())){
            return "发信邮箱格式不正确";
        }
        if(!this.isMailbox(parameter.getToMailbox())){
            return "收信邮箱格式不正确";
        }
        try{
            //获取邮件主机系统属性
            Properties properties = System.getProperties();
            //设置邮件服务器
            properties.setProperty("mail.smtp.host", parameter.getHost());
            properties.put("mail.smtp.auth", "true");
            MailSSLSocketFactory sslSocketFactory = new MailSSLSocketFactory();
            sslSocketFactory.setTrustAllHosts(true);
            properties.put("mail.smtp.ssl.enable", "true");
            properties.put("mail.smtp.ssl.socketFactory", sslSocketFactory);
            //获取session
            Session session = Session.getDefaultInstance(properties,new Authenticator(){
                public PasswordAuthentication getPasswordAuthentication() {
                    //发件人账号密码
                    return new PasswordAuthentication(parameter.getFromMailbox(), parameter.getFromMailboxPWD());
                }
            });
            //附件所在的目录路径
            File fileUrl = new File(parameter.getEnclosurePath());
            //获取目录下的所有文件(可以在.listFiles()方法中使用匿名内部类重写accept()方法针对文件名对文件进行过滤)
            File fileList [] = fileUrl.listFiles();
            //已发送邮件数
            int currentNum = 1;
            if(StringUtils.isEmpty(fileList)){
                return "文件夹"+parameter.getEnclosurePath()+"内容为空";
            }
            for(File file : fileList){
                //待发送邮件数
                int surplusNum = fileList.length-currentNum;
                //创建邮件
                MimeMessage message = new MimeMessage(session);
                message.setFrom(new InternetAddress(parameter.getFromMailbox()));
                message.addRecipient(Message.RecipientType.TO, new InternetAddress(parameter.getToMailbox()));
                //邮件名命名
                message.setSubject(file.getName());
                //邮件文本
                BodyPart messageBodyPart = new MimeBodyPart();
                String text=String.format("本次共将发送邮件%s封-已发送%s封-待发送%s封", fileList.length,currentNum,surplusNum);
                messageBodyPart.setText(text);
                //邮件内容
                Multipart multipart = new MimeMultipart();
                //将邮件文本放进邮件内容中
                multipart.addBodyPart(messageBodyPart);
                //邮件附件
                messageBodyPart = new MimeBodyPart();
                DataSource source = new FileDataSource(file);
                messageBodyPart.setDataHandler(new DataHandler(source));
                //附件名命名
                messageBodyPart.setFileName(MimeUtility.encodeText(file.getName()));
                //将附件放进邮件内容中
                multipart.addBodyPart(messageBodyPart);
                //将邮件内容放进邮件中
                message.setContent(multipart);
                //发送
                Transport.send(message);
                //发送成功后将作为附件的本地文件名添加上成功标识,防止发送邮件中程序意外终止后无法区分已发送和未发送(用时间戳区分批次顺序用currentNum区分在本批次中的顺序)
                File newFileName = new File(file.getParent() + File.separator + String.format("%s_%s_%s",parameter.getSuccessTag(),currentNum,file.getName()));
                file.renameTo(newFileName);
                currentNum++;
                System.out.println(text+"|已发送文件:"+file.getName());
                //增加时间散列防止被第三方邮箱系统检测为垃圾邮箱
                Thread.sleep(parameter.getSleepTime());
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
        return "发送成功";
    }
 
    //邮箱验证
    public boolean isMailbox(String mailbox){
        String check = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
        Pattern regex = Pattern.compile(check);
        Matcher matcher = regex.matcher(mailbox);
        boolean result = matcher.matches();
        return result;
    }
}

package Email;
 
public class Email {
    public static void main(String[] args) throws Exception {
        EmailParameter emailParameter = new EmailParameter();
        emailParameter.setFromMailbox("******@163.com");
        emailParameter.setFromMailboxPWD("******");
        emailParameter.setToMailbox("******@qq.com");
        emailParameter.setEnclosurePath("C:\\Users\\ly\\Desktop\\email");
        emailParameter.setHost("smtp.163.com");
        emailParameter.setSleepTime(5000);
        emailParameter.setSuccessTag("ss");
        System.out.println(new EmailsServiceImpl().sendEmails(emailParameter));
    }
}