【Java用法】java使用javax.mail读取邮箱，SpringBoot javax.mail获取邮件内容，根据时间段筛选邮件，内附代码，拿来即用-阿里云开发者社区

package com.iot.daily.module.web;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;
/**
 * <p>ShowMail 此类用于：日报添加控制器</p>
 * <p>@author：hujm</p>
 * <p>@date：2021年04月07日 8:45</p>
 * <p>@remark：</p>
 */
public class ShowMail {
    private MimeMessage mimeMessage = null;
    /**
     * 附件下载后的存放目录
     */
    private String saveAttachPath = "";
    /**
     * 存放邮件内容的StringBuffer对象
     */
    private final StringBuffer bodyText = new StringBuffer();
    /**
     * 默认的日前显示格式
     */
    private String dateFormat = "yy-MM-dd HH:mm";
    /**
     * 构造函数,初始化一个MimeMessage对象
     */
    public ShowMail() {
    }
    public ShowMail(MimeMessage mimeMessage) {
        this.mimeMessage = mimeMessage;
        System.out.println("创建一个ReceiveEmail对象....");
    }
    public void setMimeMessage(MimeMessage mimeMessage) {
        this.mimeMessage = mimeMessage;
        System.out.println("设置一个MimeMessage对象...");
    }
    /**
     * 获得发件人的地址和姓名
     *
     * @throws Exception
     */
    public String getFrom() throws Exception {
        InternetAddress[] address = (InternetAddress[]) mimeMessage.getFrom();
        String from = address[0].getAddress();
        if (from == null) {
            from = "";
            System.out.println("无法知道发送者.");
        }
        String personal = address[0].getPersonal();
        if (personal == null) {
            personal = "";
            System.out.println("无法知道发送者的姓名.");
        }
        String fromAddr = null;
        if (personal != null || from != null) {
            fromAddr = personal + "<" + from + ">";
            System.out.println("发送者是：" + fromAddr);
        } else {
            System.out.println("无法获得发送者信息.");
        }
        return fromAddr;
    }
    /**
     * 获得邮件的收件人，抄送，和密送的地址和姓名，根据所传递的参数的不同
     * "to"----收件人　"cc"---抄送人地址　"bcc"---密送人地址
     *
     * @param type
     * @return
     * @throws Exception
     */
    public String getMailAddress(String type) throws Exception {
        String mailAddr = "";
        String addType = type.toUpperCase();
        InternetAddress[] address = null;
        if (addType.equals("TO") || addType.equals("CC") || addType.equals("BCC")) {
            if (addType.equals("TO")) {
                address = (InternetAddress[]) mimeMessage.getRecipients(Message.RecipientType.TO);
            } else if (addType.equals("CC")) {
                address = (InternetAddress[]) mimeMessage.getRecipients(Message.RecipientType.CC);
            } else {
                address = (InternetAddress[]) mimeMessage.getRecipients(Message.RecipientType.BCC);
            }
            if (address != null) {
                for (int i = 0; i < address.length; i++) {
                    String emailAddr = address[i].getAddress();
                    if (emailAddr == null) {
                        emailAddr = "";
                    } else {
                        System.out.println("转换之前的emailAddr:" + emailAddr);
                        emailAddr = MimeUtility.decodeText(emailAddr);
                        System.out.println("转换之后的emailAddr:" + emailAddr);
                    }
                    String personal = address[i].getPersonal();
                    if (personal == null) {
                        personal = "";
                    } else {
                        System.out.println("转换之前的personal:" + personal);
                        personal = MimeUtility.decodeText(personal);
                        System.out.println("转换之后的personal:" + personal);
                    }
                    String compositeto = personal + "<" + emailAddr + ">";
                    System.out.println("完整的邮件地址：" + compositeto);
                    mailAddr += "," + compositeto;
                }
                mailAddr = mailAddr.substring(1);
            }
        } else {
            throw new Exception("错误的电子邮件类型!");
        }
        return mailAddr;
    }
    /**
     * 获得邮件主题
     *
     * @return
     * @throws MessagingException
     */
    public String getSubject() throws MessagingException {
        String subject = "";
        try {
            System.out.println("转换前的subject：" + mimeMessage.getSubject());
            subject = MimeUtility.decodeText(mimeMessage.getSubject());
            System.out.println("转换后的subject:" + mimeMessage.getSubject());
            if (subject == null) {
                subject = "";
            }
        } catch (Exception exce) {
            exce.printStackTrace();
        }
        return subject;
    }
    /**
     * 获得邮件发送日期
     *
     * @return
     * @throws Exception
     */
    public String getSentDate() throws Exception {
        Date sentDate = mimeMessage.getSentDate();
        System.out.println("发送日期原始类型:" + dateFormat);
        SimpleDateFormat format = new SimpleDateFormat(dateFormat);
        String strSentDate = format.format(sentDate);
        System.out.println("发送日期可读类型:" + strSentDate);
        return strSentDate;
    }
    /**
     * 获得邮件正文内容
     *
     * @return
     */
    public String getBodyText() {
        return bodyText.toString();
    }
    /**
     * 解析邮件，把得到的邮件内容保存到一个StringBuffer对象中，解析邮件
     * 主要是根据MimeType类型的不同执行不同的操作，一步一步的解析
     *
     * @param part
     * @throws Exception
     */
    public void getMailContent(Part part) throws Exception {
        String contentType = part.getContentType();
        //获得邮件的MimeType类型
        System.out.println("邮件的MimeType类型:" + contentType);
        int nameIndex = contentType.indexOf("name");
        boolean conName = false;
        if (nameIndex != -1) {
            conName = true;
        }
        System.out.println("邮件内容的类型:　" + contentType);
        if (part.isMimeType("text/plain") && conName == false) {
            //text/plain类型
            bodyText.append((String) part.getContent());
        } else if (part.isMimeType("text/html") && conName == false) {
            //text/html类型
            bodyText.append((String) part.getContent());
        } else if (part.isMimeType("multipart/*")) {
            //multipart/*
            Multipart multipart = (Multipart) part.getContent();
            int counts = multipart.getCount();
            for (int i = 0; i < counts; i++) {
                getMailContent(multipart.getBodyPart(i));
            }
        } else if (part.isMimeType("message/rfc822")) {
            //message/rfc822
            getMailContent((Part) part.getContent());
        } else {
            System.out.println("");
        }
    }
    /**
     * 判断此邮件是否需要回执，如果需要回执返回"true",否则返回"false"
     *
     * @return
     * @throws MessagingException
     */
    public boolean getReplySign() throws MessagingException {
        boolean replySign = false;
        String[] needReply = mimeMessage.getHeader("Disposition-Notification-To");
        if (needReply != null) {
            replySign = true;
        }
        if (replySign) {
            System.out.println("该邮件需要回复");
        } else {
            System.out.println("该邮件不需要回复");
        }
        return replySign;
    }
    /**
     * 获得此邮件的Message-ID
     *
     * @return
     * @throws MessagingException
     */
    public String getMessageId() throws MessagingException {
        String messageID = mimeMessage.getMessageID();
        System.out.println("邮件ID:" + messageID);
        return messageID;
    }
    /**
     * 判断此邮件是否已读，如果未读返回false,反之返回true
     *
     * @return
     * @throws MessagingException
     */
    public boolean isNew() throws MessagingException {
        boolean isNew = false;
        Flags flags = ((Message) mimeMessage).getFlags();
        Flags.Flag[] flag = flags.getSystemFlags();
        System.out.println("flags的长度:　" + flag.length);
        for (int i = 0; i < flag.length; i++) {
            if (flag[i] == Flags.Flag.SEEN) {
                isNew = true;
                System.out.println("seenemail...");
                //break;
            }
        }
        return isNew;
    }
    /**
     * 判断此邮件是否包含附件
     *
     * @param part
     * @return
     * @throws Exception
     */
    public boolean isContainAttach(Part part) throws Exception {
        boolean attachFlag = false;
        if (part.isMimeType("multipart/*")) {
            Multipart mp = (Multipart) part.getContent();
            for (int i = 0; i < mp.getCount(); i++) {
                BodyPart mPart = mp.getBodyPart(i);
                String disposition = mPart.getDisposition();
                if ((disposition != null) && ((disposition.equals(Part.ATTACHMENT)) || (disposition.equals(Part.INLINE)))) {
                    attachFlag = true;
                } else if (mPart.isMimeType("multipart/*")) {
                    attachFlag = isContainAttach((Part) mPart);
                } else {
                    String conType = mPart.getContentType();
                    if (conType.toLowerCase().indexOf("application") != -1) {
                        attachFlag = true;
                    }
                    if (conType.toLowerCase().indexOf("name") != -1) {
                        attachFlag = true;
                    }
                }
            }
        } else if (part.isMimeType("message/rfc822")) {
            attachFlag = isContainAttach((Part) part.getContent());
        }
        return attachFlag;
    }
    /**
     * 保存附件
     *
     * @param part
     * @throws Exception
     */
    public void saveAttachMent(Part part) throws Exception {
        String fileName = "";
        if (part.isMimeType("multipart/*")) {
            Multipart mp = (Multipart) part.getContent();
            for (int i = 0; i < mp.getCount(); i++) {
                BodyPart mPart = mp.getBodyPart(i);
                String disposition = mPart.getDisposition();
                if ((disposition != null) && ((disposition.equals(Part.ATTACHMENT)) || (disposition.equals(Part.INLINE)))) {
                    fileName = mPart.getFileName();
                    if (fileName.toLowerCase().indexOf("gb2312") != -1) {
                        fileName = MimeUtility.decodeText(fileName);
                    }
                    // saveFile(fileName, mPart.getInputStream());
                } else if (mPart.isMimeType("multipart/*")) {
                    saveAttachMent(mPart);
                } else {
                    fileName = mPart.getFileName();
                    if ((fileName != null) && (fileName.toLowerCase().indexOf("GB2312") != -1)) {
                        fileName = MimeUtility.decodeText(fileName);
                        // saveFile(fileName, mPart.getInputStream());
                    }
                }
            }
        } else if (part.isMimeType("message/rfc822")) {
            saveAttachMent((Part) part.getContent());
        }
    }
    /**
     * 设置附件存放路径
     *
     * @param attachPath
     */
    public void setAttachPath(String attachPath) {
        this.saveAttachPath = attachPath;
    }
    /**
     * 设置日期显示格式
     *
     * @param format
     * @throws Exception
     */
    public void setDateFormat(String format) throws Exception {
        this.dateFormat = format;
    }
    /**
     * 获得附件存放路径
     *
     * @return
     */
    public String getAttachPath() {
        return saveAttachPath;
    }
    /**
     * 真正的保存附件到指定目录里
     *
     * @param fileName
     * @param in
     * @throws Exception
     */
    private void saveFile(String fileName, InputStream in) throws Exception {
        String osName = System.getProperty("os.name");
        String storeDir = getAttachPath();
        String separator = "";
        if (osName == null) {
            osName = "";
        }
        if (osName.toLowerCase().indexOf("win") != -1) {
            separator = "\\";
            if (storeDir == null || storeDir.equals("")) {
                storeDir = "c:\\tmp";
            }
        } else {
            separator = "/";
            storeDir = "/tmp";
        }
        File storeFile = new File(storeDir + separator + fileName);
        System.out.println("附件的保存地址:　" + storeFile.toString());
        BufferedOutputStream bos = null;
        BufferedInputStream bis = null;
        try {
            bos = new BufferedOutputStream(new FileOutputStream(storeFile));
            bis = new BufferedInputStream(in);
            int c;
            while ((c = bis.read()) != -1) {
                bos.write(c);
                bos.flush();
            }
        } catch (Exception exception) {
            exception.printStackTrace();
            throw new Exception("文件保存失败!");
        } finally {
            bos.close();
            bis.close();
        }
    }
}

测试类

    /**
     * ReceiveEmail类测试
     *
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        // 邮件的服务器主机类型，改成你自己的
        String host = "imap.****.com";
        // 邮箱的账号和密码，改成你自己的
        String username = "zhangsan@****.com";
        String password = "*****";
        Properties props = new Properties();
        Session session = Session.getDefaultInstance(props, null);
        Store store = session.getStore("imap");
        store.connect(host, username, password);
        Folder folder = store.getFolder("INBOX");
        folder.open(Folder.READ_ONLY);
        Message[] message = folder.getMessages();
        System.out.println("邮件数量:　" + message.length);
        ShowMail re = null;
        List<ShowMail> showMailList = new ArrayList<>();
        for (Message value : message) {
            re = new ShowMail((MimeMessage) value);
            String subject = re.getSubject();
            if (subject.contains("官网")) {
                showMailList.add(re);
            }
        }
        System.out.println("总共包含 " + showMailList.size() + " 个邮件");
        for (int i = 0; i < showMailList.size(); i++) {
            System.out.println("邮件　" + i + "　主题:　" + showMailList.get(i).getSubject());
            System.out.println("邮件　" + i + "　发送时间:　" + showMailList.get(i).getSentDate());
            System.out.println("邮件　" + i + "　是否需要回复:　" + showMailList.get(i).getReplySign());
            System.out.println("邮件　" + i + "　是否已读:　" + showMailList.get(i).isNew());
            System.out.println("邮件　" + i + "　是否包含附件:　" + showMailList.get(i).isContainAttach((Part) message[i]));
            System.out.println("邮件　" + i + "　发送人地址:　" + showMailList.get(i).getFrom());
            System.out.println("邮件　" + i + "　收信人地址:　" + showMailList.get(i).getMailAddress("to"));
            System.out.println("邮件　" + i + "　抄送:　" + showMailList.get(i).getMailAddress("cc"));
            System.out.println("邮件　" + i + "　暗抄:　" + showMailList.get(i).getMailAddress("bcc"));
            showMailList.get(i).setDateFormat("yy年MM月dd日　HH:mm");
            System.out.println("邮件　" + i + "　发送时间:　" + showMailList.get(i).getSentDate());
            System.out.println("邮件　" + i + "　邮件ID:　" + showMailList.get(i).getMessageId());
            showMailList.get(i).getMailContent((Part) message[i]);
            System.out.println("邮件　" + i + "　正文内容:　\r\n" + showMailList.get(i).getBodyText());
            showMailList.get(i).saveAttachMent((Part) message[i]);
        }
        /*for (int i = 0; i < showMailList.size(); i++) {
            System.out.println("邮件　" + i + "　主题:　" + re.getSubject());
            System.out.println("邮件　" + i + "　发送时间:　" + re.getSentDate());
            System.out.println("邮件　" + i + "　是否需要回复:　" + re.getReplySign());
            System.out.println("邮件　" + i + "　是否已读:　" + re.isNew());
            System.out.println("邮件　" + i + "　是否包含附件:　" + re.isContainAttach((Part) message[i]));
            System.out.println("邮件　" + i + "　发送人地址:　" + re.getFrom());
            System.out.println("邮件　" + i + "　收信人地址:　" + re.getMailAddress("to"));
            System.out.println("邮件　" + i + "　抄送:　" + re.getMailAddress("cc"));
            System.out.println("邮件　" + i + "　暗抄:　" + re.getMailAddress("bcc"));
            re.setDateFormat("yy年MM月dd日　HH:mm");
            System.out.println("邮件　" + i + "　发送时间:　" + re.getSentDate());
            System.out.println("邮件　" + i + "　邮件ID:　" + re.getMessageId());
            re.getMailContent((Part) message[i]);
            System.out.println("邮件　" + i + "　正文内容:　\r\n" + re.getBodyText());
            // re.setAttachPath("h:/123");
            re.saveAttachMent((Part) message[i]);
        }*/
    }

注意事项：

// 邮件的服务器主机类型，改成你自己的，从邮箱即可查看

String host = "imap.****.com";

// 邮箱的账号和密码，改成你自己的

String username = "zhangsan@****.com";

String password = "*****";

如果想要根据时间段来筛选：则可以在获取全量邮件之前添加筛选条件

   // 以下为添加根据时间筛选邮件的条件
    Calendar calendar = Calendar.getInstance();
    // 搜索3天前到今天收到的的所有邮件，根据时间筛选邮件
    calendar.add(Calendar.DAY_OF_MONTH, -3);
    // 创建ReceivedDateTerm对象，ComparisonTerm.GE（大于等于），Date类型的时间 new Date(calendar.getTimeInMillis())----（表示3天前）
    ReceivedDateTerm term = new ReceivedDateTerm(ComparisonTerm.GE, new Date(calendar.getTimeInMillis()));
    // 把时间筛选条件添加到收件箱文件夹里，得到3天前到今天的所有邮件
    Message[] message = folder.search(term);
    // Message[] message = folder.getMessages(); 这个是获取收件箱里所有邮件

有可能出现的报错可以查看另一篇博客：【Java异常】Caused by: com.sun.mail.iap.BadCommandException: A3 BAD invalid command or parameters的解决方案

完结！

【Java用法】java使用javax.mail读取邮箱，SpringBoot javax.mail获取邮件内容，根据时间段筛选邮件，内附代码，拿来即用

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