javamail发送接收的简单demo

目录结构

首先引入文件

 <dependencies>
        <dependency>
            <groupId>com.sun.mailgroupId>
            <artifactId>javax.mailartifactId>
            <version>1.6.2version>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>1.18.2version>
            <scope>providedscope>
        dependency>
    dependencies>

定义实体类

package com.match.entry;

import lombok.Data;

import java.util.Date;
import java.util.List;

@Data
public class Mail {
    private String userName;//用户名
    private String password;//密码或授权码
    private String host;//端口
    private String protocol;//协议栈
    private int port; //端口
    private boolean SSL;//是否使用ssl
    private boolean auth;//是否验证登录
    private String socketFactory; //socket
    private String fromEmail;//邮件发送者
    private String recipient;//邮箱接收者
    private String subject;//邮件主题
    private Date date;//邮件日期

    private List<MailAttach> mailContentList;//邮件正文

    private List<MailAttach> mailAttachList;//邮件附件
}

定义附件类

package com.match.entry;

import lombok.Data;

@Data
public class MailAttach {

    private String fileName;//附件名
    private String content;//文字
    private boolean pic;//是否是图片，true:是 false:否
    private boolean excel;//是否是excel文件，true:是 false:否
}

发送端

主要配置

package com.match;

import com.match.entry.Mail;
import com.match.entry.MailAttach;
import com.match.util.SendMailUtil;

import java.util.ArrayList;
import java.util.List;

public class SendMailDemo {

    public static void main(String[] args) {
        Mail mail = new Mail();
        mail.setUserName("[email protected]");//用户名
        mail.setPassword("xxxxxx");//授权码或密码
        mail.setHost("smtp.aliyun.com");
        mail.setProtocol("smtp");
        mail.setAuth(true);
        mail.setSocketFactory("javax.net.ssl.SSLSocketFactory");
        mail.setPort(465);
        mail.setFromEmail("[email protected]");//发送者
        mail.setRecipient("[email protected]");//接收者
        mail.setSubject("带附件和带图片的的邮件");

        List<MailAttach> list = new ArrayList<>();
        List<MailAttach> list1 = new ArrayList<>();
        MailAttach attach1 = new MailAttach();
        attach1.setContent("收到请回复，谢谢
");
        attach1.setFileName("1.jpg");
        attach1.setPic(true);
        MailAttach attach2 = new MailAttach();
        attach2.setFileName("1.zip");
        list.add(attach1);
        list.add(attach2);
        list1.add(attach1);
        mail.setMailAttachList(list);
        mail.setMailContentList(list1);
        SendMailUtil.sendMail(mail);
    }
}

mail内容处理

package com.match.util;

import com.match.entry.Mail;
import com.match.entry.MailAttach;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.UnsupportedEncodingException;

public class SendMailUtil {
    private final static String RESOURCE_URL = "src/main/resources/";

    /**
     * @param mail
     * @throws Exception
     */
    public static void sendMail(Mail mail) {
        //使用JavaMail发送邮件的5个步骤
        //1、创建session
        Session session = MailSessionUtil.createSessionUtil(mail);
        //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态
//        session.setDebug(false);
        session.setDebug(true);
        //2、通过session得到transport对象
        Transport ts = null;
        try {
            ts = session.getTransport();
            //3、连上邮件服务器
            ts.connect();
            //4、创建邮件
            Message message = createMixedMail(session, mail);
            //5、发送邮件
            ts.sendMessage(message, message.getAllRecipients());
        } catch (Exception e) {
            try {
                System.out.println(MimeUtility.encodeText(e.getMessage()));
            } catch (UnsupportedEncodingException e1) {
                e1.printStackTrace();
            }
            e.printStackTrace();
        } finally {
            try {
                if (ts != null) {
                    ts.close();
                }
            } catch (MessagingException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @param session
     * @return
     * @throws Exception
     * @Method: createMixedMail
     * @Description: 生成一封带附件和带图片的邮件
     */
    private static MimeMessage createMixedMail(Session session, Mail mail) throws Exception {
        //创建邮件
        MimeMessage message = new MimeMessage(session);

        //设置邮件的基本信息
        message.setFrom(new InternetAddress(mail.getFromEmail()));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(mail.getRecipient()));
        message.setSubject(mail.getSubject());

        //代表正文的bodypart
        MimeBodyPart content = new MimeBodyPart();
        //设置正文
        MimeMultipart mp1 = setContent(mail);


        //描述关系:正文和附件
        MimeMultipart mp2 = setAttach(mail);
        //添加正文
        if(mp1 != null) {
            content.setContent(mp1);
            mp2.addBodyPart(content);
            mp2.setSubType("mixed");
        }

        message.setContent(mp2);
        message.saveChanges();
//        message.writeTo(new FileOutputStream("E:\\MixedMail.eml"));
        //返回创建好的的邮件
        return message;
    }

    /**
     * 设置邮件正文
     * @param mail
     * @return
     * @throws MessagingException
     */
    private static MimeMultipart setContent(Mail mail) throws MessagingException {

        //正文内容
        if (mail.getMailContentList() != null && !mail.getMailContentList().isEmpty()) {
            //描述关系:正文和图片
            MimeMultipart mp1 = new MimeMultipart();
            mp1.setSubType("related");
            for (MailAttach attach : mail.getMailContentList()) {
                if (attach.getContent() != null) {
                    MimeBodyPart bodyPart = new MimeBodyPart();
                    //设置内容时需要设置图片链接
                    bodyPart.setContent(attach.getContent() + "", "text/html;charset=UTF-8");
                    mp1.addBodyPart(bodyPart);
                }
                if (attach.getFileName() != null) {
                    //设置图片附件
                    MimeBodyPart bodyPart = new MimeBodyPart();
                    DataHandler dh = new DataHandler(new FileDataSource(RESOURCE_URL + attach.getFileName()));
                    bodyPart.setDataHandler(dh);
                    if (attach.isPic()) {
                        bodyPart.setContentID(attach.getFileName());
                    }
                    mp1.addBodyPart(bodyPart);
                }
            }
            return mp1;
        }
        return null;
    }

    /**
     * 设置附件
     * @param mail
     * @return
     * @throws MessagingException
     * @throws UnsupportedEncodingException
     */
    private static MimeMultipart setAttach(Mail mail) throws MessagingException, UnsupportedEncodingException {
        MimeMultipart mp2 = new MimeMultipart();
        //添加附件
        if (mail.getMailAttachList() != null && !mail.getMailAttachList().isEmpty()) {
            for (MailAttach mailAttach : mail.getMailAttachList()) {
                MimeBodyPart attach = new MimeBodyPart();
                if (mailAttach.getFileName() != null) {
                    //附件
                    DataHandler dh = new DataHandler(new FileDataSource(RESOURCE_URL + mailAttach.getFileName()));
                    attach.setDataHandler(dh);
                    attach.setFileName(MimeUtility.encodeText(dh.getName()));
                }
                mp2.addBodyPart(attach);
            }
        }
        return mp2;
    }
}

生成mailsession,用于连接配置

package com.match.util;

import com.match.entry.Mail;

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import java.util.Properties;

public class MailSessionUtil {
    /**
     * 生成mail的session
     * @param mail
     * @return
     */
    public static Session createSessionUtil(Mail mail){
        // 创建验证器
        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                // 密码验证
                return new PasswordAuthentication(mail.getUserName(), mail.getPassword());
            }
        };
        /*
         *Properties是一个属性对象，用来创建Session对象
         */
        Properties properties = new Properties();
//        properties.put("mail.pop3.ssl.enable", mail.isSSL());
//        properties.put("mail.pop3.host", mail.getHost());
//        properties.put("mail.pop3.port", mail.getPort());
        properties.setProperty("mail.host", mail.getHost());
        properties.setProperty("mail.transport.protocol", mail.getProtocol());
        properties.setProperty("mail.smtp.auth", mail.isAuth() + "");
        properties.setProperty("mail.smtp.socketFactory.class", mail.getSocketFactory());
        properties.setProperty("mail.smtp.port", mail.getPort() + "");
        properties.setProperty("mail.smtp.socketFactory.port", mail.getPort() + "");
        /*
         *Session类定义了一个基本的邮件对话。
         */
        return Session.getInstance(properties, auth);
    }
}

接收端

package com.match;

import com.match.entry.Mail;
import com.match.util.ReceiveMailUtil;

public class ReceiveMailDemo {



    public static void main(String[] args) {
        Mail mail = new Mail();
        mail.setUserName("[email protected]");//用户名
        mail.setPassword("xxxxxxxxxxxx");//授权码或密码
//        mail.setPort(995);//端口
//        mail.setHost("pop.qq.com");//QQ邮箱的pop3服务器
//        mail.setProtocol("pop3");//使用pop3协议
        mail.setPort(993);//端口
        mail.setHost("imap.qq.com");//QQ邮箱的pop3服务器
        mail.setProtocol("imap");//使用pop3协议
        mail.setSSL(true);//使用SSL加密
        mail.setAuth(true);
        mail.setSocketFactory("javax.net.ssl.SSLSocketFactory");
        //read 本地已经读过的邮件数，pop3与imap均不支持对邮件操作
        ReceiveMailUtil.recipient(mail,1176);
    }


}

接收内容处理

这里处理为只接收excel

package com.match.util;

import com.match.entry.Mail;
import com.match.entry.MailAttach;

import javax.mail.*;
import javax.mail.internet.MimeUtility;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.*;

public class ReceiveMailUtil {
    private final static String FILE_URL = "E:\\";
    private final static String excel2003L = ".xls";    //2003- 版本的excel
    private final static String excel2007U = ".xlsx";   //2007+ 版本的excel

    /**
     * @param mail
     * @param read 已经读到的邮件数目
     * @return
     */
    public static List<Mail> recipient(Mail mail, Integer read) {
        Session session = MailSessionUtil.createSessionUtil(mail);
        session.setDebug(false);
        /*
         * Store类实现特定邮件协议上的读、写、监视、查找等操作。
         * 通过Store类可以访问Folder类。
         * Folder类用于分级组织邮件，并提供照Message格式访问email的能力。
         */
        Store store = null;
        Folder folder = null;
        List<Mail> receiveList = new ArrayList<>();
        try {
            store = session.getStore(mail.getProtocol());
            store.connect(mail.getUserName(), mail.getPassword());

            folder = store.getFolder("INBOX");
            folder.open(Folder.READ_WRITE);//打开收件箱
//            folder.open(Folder.READ_ONLY);//打开收件箱
            // 由于POP3协议无法获知邮件的状态,所以getUnreadMessageCount得到的是收件箱的邮件总数
            int unread = folder.getUnreadMessageCount();
            System.out.println("未读邮件数: " + unread);
//            // 由于POP3协议无法获知邮件的状态,所以下面得到的结果始终都是为0
            System.out.println("删除邮件数: " + folder.getDeletedMessageCount());
            System.out.println("新邮件: " + folder.getNewMessageCount());
//            // 获得收件箱中的邮件总数
            System.out.println("邮件总数: " + folder.getMessageCount());


            int size = folder.getMessageCount();//获取邮件数目
            //获取邮件
            for (int i = read + 1; i <= size; i++) {
                Message message = folder.getMessage(i);
                //解析邮件内容
                String from = message.getFrom()[0].toString();
                String subject = message.getSubject();
                Date date = message.getSentDate();
                Mail receiveMail = new Mail();
                if (!(message.getContent() instanceof String)) {
                    parseMultipart((Multipart) message.getContent(), receiveMail);
                }
                receiveMail.setFromEmail(getSubChinese(from));
                receiveMail.setSubject(subject);
                receiveMail.setDate(date);
                receiveList.add(receiveMail);
            }

            System.out.println("接收成功！");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (folder != null) {
                    folder.close(false);
                }
                if (store != null) {
                    store.close();
                }
            } catch (Exception e) {
                System.out.println("接收失败！");
                e.printStackTrace();
            }
        }

        System.out.println("接收完毕！");
        return receiveList;
    }

    /**
     * 对复杂邮件的解析
     *
     * @param multipart
     * @param receiveMail
     * @throws MessagingException
     * @throws IOException
     */
    private static Mail parseMultipart(Multipart multipart, Mail receiveMail) throws MessagingException, IOException {

        List<MailAttach> contentList = new ArrayList<>();
        List<MailAttach> attachList = new ArrayList<>();
        int count = multipart.getCount();
//        System.out.println("count =  " + count);
        for (int idx = 0; idx < count; idx++) {
            BodyPart bodyPart = multipart.getBodyPart(idx);
            MailAttach attach = new MailAttach();
//            System.out.println(bodyPart.getContentType());
            if (bodyPart.isMimeType("text/plain")) {
                attach.setContent(bodyPart.getContent().toString());
                contentList.add(attach);
//                System.out.println("plain................." + bodyPart.getContent());
            } else if (bodyPart.isMimeType("text/html")) {
                attach.setContent(bodyPart.getContent().toString());
                contentList.add(attach);
//                System.out.println("html..................." + bodyPart.getContent());
            } else if (bodyPart.isMimeType("multipart/*")) {
                Multipart mpart = (Multipart) bodyPart.getContent();
                parseMultipart(mpart, receiveMail);
            } else if (bodyPart.isMimeType("application/octet-stream")) {
                String disposition = bodyPart.getDisposition();
//                System.out.println(disposition);
                if (disposition.equalsIgnoreCase(BodyPart.ATTACHMENT)) {
                    saveFile(bodyPart, attach);
                    attachList.add(attach);
                }
            } else if (bodyPart.isMimeType("image/jpeg")) {
                saveFile(bodyPart, attach);
                attach.setPic(true);
                attachList.add(attach);
            }

        }
        if (!contentList.isEmpty()) {
            receiveMail.setMailContentList(contentList);
        }
        if (!attachList.isEmpty()) {
            receiveMail.setMailAttachList(attachList);
        }
        return receiveMail;
    }

    /**
     * 保存文件到本地
     *
     * @param bodyPart
     * @param attach
     * @throws MessagingException
     * @throws IOException
     */
    private static void saveFile(BodyPart bodyPart, MailAttach attach) throws MessagingException, IOException {

        String fileName = getSubChinese(bodyPart.getFileName());
        boolean flag = isExcelFile(fileName);
        if (flag) {
            fileName = newFileName(fileName);
            InputStream is = bodyPart.getInputStream();
            String fileUrl = FILE_URL + fileName;
            copy(is, new FileOutputStream(fileUrl));
            attach.setFileName(fileUrl);
        } else {
            attach.setFileName(fileName);
        }
        attach.setExcel(flag);
    }

    /**
     * 转码
     *
     * @param str
     * @return
     */
    private static String getSubChinese(String str) {
        String rtnStr;
        try {
            if(str==null)
                return null;
            rtnStr = new String(str.getBytes(StandardCharsets.ISO_8859_1));
            if (rtnStr.contains("=")) {
                rtnStr = MimeUtility.decodeText(str);
            }
        } catch (UnsupportedEncodingException e) {
            rtnStr = str;
            e.printStackTrace();
        }
//        System.out.println(rtnStr);
        return rtnStr;
    }

    /**
     * 文件拷贝，在用户进行附件下载的时候，可以把附件的InputStream传给用户进行下载
     *
     * @param is
     * @param os
     * @throws IOException
     */
    private static void copy(InputStream is, OutputStream os) throws IOException {
        byte[] bytes = new byte[1024];
        int len;
        while ((len = is.read(bytes)) != -1) {
            os.write(bytes, 0, len);
        }
        if (os != null)
            os.close();
        is.close();
    }

    /**
     * 判断是否为excel
     *
     * @param fileName
     */
    private static boolean isExcelFile(String fileName) {
        if(fileName==null)
            return false;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if (excel2003L.equals(fileType) || excel2007U.equals(fileType)) {
            return true;
        }
        return false;
    }

    /**
     * 保存文件增加时间戳表示
     *
     * @param fileName
     * @return
     */
    private static String newFileName(String fileName) {
        int index = fileName.lastIndexOf(".");
        String fileType = fileName.substring(index);
        fileName = fileName.substring(0, index);
        fileName = fileName + Calendar.getInstance().getTimeInMillis() + fileType;
        return fileName;
    }
}

gitee代码地址：https://gitee.com/leftbehindmatches/javamail-demo.git