需要下载3个jar包:mail.jar/    activation.jar/    additionnal.jar

1.pop3

    /**
     * 以pop3方式读取邮件,此方法不能读取邮件是否为已读,已经通过测试
     * */
    private void getEmail() {
        List> list = new ArrayList>();

        try {
            Properties props = System.getProperties();
            props.put("mail.smtp.host", "smtp.163.com");
            props.put("mail.smtp.auth", "true");
            Session session = Session.getDefaultInstance(props, null);
            URLName urln = new URLName("pop3", "pop3.163.com", 110, null,
                    "邮箱名(没有@163.com)", "密码");
            // 邮件协议为pop3,邮件服务器是pop3.163.com,端口为110,用户名/密码为abcw111222/123456w
            Store store = session.getStore(urln);
            store.connect();
            Folder folder = store.getFolder("INBOX");
            folder.open(Folder.READ_WRITE);
            Message message[] = folder.getMessages();
            if (message.length > 0) {
                Map map;
                System.out.println("Messages's length: " + message.length);
                ReciveOneMail pmm = null;
                for (int i = 0; i < message.length; i++) {
                    System.out.println("======================");
                    pmm = new ReciveOneMail((MimeMessage) message[i]);
                    System.out.println("Message " + i + " subject: "
                            + pmm.getSubject());
                    System.out.println("Message " + i + " sentdate: "
                            + pmm.getSentDate());
                    System.out.println("Message " + i + " replysign: "
                            + pmm.getReplySign());

                    boolean isRead = pmm.isNew();// 判断邮件是否为已读
                    System.out.println("Message " + i + " hasRead: " + isRead);
                    System.out.println("Message " + i + "  containAttachment: "
                            + pmm.isContainAttach((Part) message[i]));
                    System.out.println("Message " + i + " form: "
                            + pmm.getFrom());
                    System.out.println("Message " + i + " to: "
                            + pmm.getMailAddress("to"));
                    System.out.println("Message " + i + " cc: "
                            + pmm.getMailAddress("cc"));
                    System.out.println("Message " + i + " bcc: "
                            + pmm.getMailAddress("bcc"));
                    pmm.setDateFormat("yy年MM月dd日 HH:mm");
                    System.out.println("Message " + i + " sentdate: "
                            + pmm.getSentDate());
                    System.out.println("Message " + i + " Message-ID: "
                            + pmm.getMessageId());
                    // 获得邮件内容===============
                    pmm.getMailContent((Part) message[i]);
                    System.out.println("Message " + i + " bodycontent: \r\n"
                            + pmm.getBodyText());
                    String file_path = File.separator + "mnt" + File.separator
                            + "sdcard" + File.separator;
                    System.out.println(file_path);
                    pmm.setAttachPath(file_path);
                    pmm.saveAttachMent((Part) message[i]);

                    map = new HashMap();
                    map.put("from", pmm.getFrom());
                    map.put("title", pmm.getSubject());
                    map.put("time", pmm.getSentDate());
                    map.put("read", isRead);
                    list.add(map);
                }
                SimpleAdapter adapter = new SimpleAdapter(MainActivity.this,
                        list, R.layout.item_receiveemail, new String[] {
                                "from", "title", "time", "read" }, new int[] {
                                R.id.item_receive_sendname,
                                R.id.item_receive_title,
                                R.id.item_receive_sendtime,
                                R.id.item_receive_read });
                lv.setAdapter(adapter);

            } else {
                Toast.makeText(MainActivity.this, "没有邮件", Toast.LENGTH_SHORT)
                        .show();
            }
        } catch (NoSuchProviderException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

2.imap方式

    /**
     * 以imap方式读取邮件,可以判定读取邮件是否为已读
     * */
    private void getImapEmail() {
        String user = "abcw111222@163.com";// 邮箱的用户名
        String password = "123456w"; // 邮箱的密码

        Properties prop = System.getProperties();
        prop.put("mail.store.protocol", "imap");
        prop.put("mail.imap.host", "imap.163.com");

        Session session = Session.getInstance(prop);

        int total = 0;
        IMAPStore store;
        try {
            store = (IMAPStore) session.getStore("imap"); // 使用imap会话机制,连接服务器

            store.connect(user, password);

            IMAPFolder folder = (IMAPFolder) store.getFolder("INBOX"); // 收件箱
            folder.open(Folder.READ_WRITE);
            // 获取总邮件数
            total = folder.getMessageCount();
            System.out.println("---共有邮件:" + total + " 封---");
            // 得到收件箱文件夹信息,获取邮件列表
            List> list = new ArrayList>();
            System.out.println("未读邮件数:" + folder.getUnreadMessageCount());
            Message[] messages = folder.getMessages();
            if (messages.length > 0) {
                Map map;
                System.out.println("Messages's length: " + messages.length);
                ReciveOneMail pmm = null;
                for (int i = 0; i < messages.length; i++) {
                    System.out.println("======================");
                    pmm = new ReciveOneMail((MimeMessage) messages[i]);
                    System.out.println("Message " + i + " subject: "
                            + pmm.getSubject());
                    try {
                        System.out.println("Message " + i + " sentdate: "
                                + pmm.getSentDate());
                        System.out.println("Message " + i + " replysign: "
                                + pmm.getReplySign());

                        boolean isRead;// 用来判断该邮件是否为已读
                        String read;
                        Flags flags = messages[i].getFlags();
                        if (flags.contains(Flags.Flag.SEEN)) {
                            System.out.println("这是一封已读邮件");
                            isRead = true;
                            read = "已读";
                        } else {
                            System.out.println("未读邮件");
                            isRead = false;
                            read = "未读";
                        }
                        System.out.println("Message " + i + " hasRead: "
                                + isRead);
                        System.out.println("Message " + i
                                + "  containAttachment: "
                                + pmm.isContainAttach((Part) messages[i]));
                        System.out.println("Message " + i + " form: "
                                + pmm.getFrom());
                        System.out.println("Message " + i + " to: "
                                + pmm.getMailAddress("to"));
                        System.out.println("Message " + i + " cc: "
                                + pmm.getMailAddress("cc"));
                        System.out.println("Message " + i + " bcc: "
                                + pmm.getMailAddress("bcc"));
                        pmm.setDateFormat("yy年MM月dd日 HH:mm");
                        System.out.println("Message " + i + " sentdate: "
                                + pmm.getSentDate());
                        System.out.println("Message " + i + " Message-ID: "
                                + pmm.getMessageId());
                        // 获得邮件内容===============
                        pmm.getMailContent((Part) messages[i]);
                        System.out.println("Message " + i
                                + " bodycontent: \r\n" + pmm.getBodyText());
                        String file_path = File.separator + "mnt"
                                + File.separator + "sdcard" + File.separator;
                        System.out.println(file_path);
                        pmm.setAttachPath(file_path);
                        pmm.saveAttachMent((Part) messages[i]);

                        map = new HashMap();
                        map.put("from", pmm.getFrom());
                        map.put("title", pmm.getSubject());
                        map.put("time", pmm.getSentDate());
                        map.put("read", read);
                        list.add(map);
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }
                SimpleAdapter adapter = new SimpleAdapter(MainActivity.this,
                        list, R.layout.item_receiveemail, new String[] {
                                "from", "title", "time", "read" }, new int[] {
                                R.id.item_receive_sendname,
                                R.id.item_receive_title,
                                R.id.item_receive_sendtime,
                                R.id.item_receive_read });
                lv.setAdapter(adapter);
            }
        } catch (javax.mail.NoSuchProviderException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

下面为用到的一个类,用来读取除了判断是否已读的信息之外的内容

/**
 * 接收邮箱中的邮件,可以接收带附件的
 * (目前接收的邮件中含有中文内容,会出现乱码,但是标题不会乱码)
 * 邮件中的内容如果用专门的阅读器也不会出现乱码现象,图片等都可以下载
 * */
@SuppressLint("DefaultLocale")
public class ReciveOneMail {

    private MimeMessage mimeMessage = null;
    private String saveAttachPath = ""; // 附件下载后的存放目录
    private StringBuffer bodytext = new StringBuffer();// 存放邮件内容
    private String dateformat = "yy-MM-dd HH:mm"; // 默认的日前显示格式

    public ReciveOneMail(MimeMessage mimeMessage) {
        this.mimeMessage = mimeMessage;
    }

    public void setMimeMessage(MimeMessage mimeMessage) {
        this.mimeMessage = mimeMessage;
    }

    /**
     * 获得发件人的地址和姓名
     */
    public String getFrom() throws Exception {
        InternetAddress address[] = (InternetAddress[]) mimeMessage.getFrom();
        String from = address[0].getAddress();
        if (from == null)
            from = "";
        String personal = address[0].getPersonal();
        if (personal == null)
            personal = "";
        String fromaddr = personal + "<" + from + ">";
        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
     */
    @SuppressLint("DefaultLocale")
    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 email = address[i].getAddress();
                    if (email == null)
                        email = "";
                    else {
                        email = MimeUtility.decodeText(email);
                    }
                    String personal = address[i].getPersonal();
                    if (personal == null)
                        personal = "";
                    else {
                        personal = MimeUtility.decodeText(personal);
                    }
                    String compositeto = personal + "<" + email + ">";
                    mailaddr += "," + compositeto;
                }
                mailaddr = mailaddr.substring(1);
            }
        } else {
            throw new Exception("Error emailaddr type!");
        }
        return mailaddr;
    }

    /**
     * 获得邮件主题
     */
    public String getSubject() throws MessagingException {
        String subject = "";
        try {
            subject = MimeUtility.decodeText(mimeMessage.getSubject());
            if (subject == null)
                subject = "";
        } catch (Exception exce) {
        }
        return subject;
    }

    /**
     * 获得邮件发送日期
     */
    @SuppressLint("SimpleDateFormat")
    public String getSentDate() throws Exception {
        Date sentdate = mimeMessage.getSentDate();
        SimpleDateFormat format = new SimpleDateFormat(dateformat);
        return format.format(sentdate);
    }

    /**
     * 获得邮件正文内容
     */
    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
     */
    public void getMailContent(Part part) throws Exception {
        String contenttype = part.getContentType();
        int nameindex = contenttype.indexOf("name");
        boolean conname = false;
        if (nameindex != -1)
            conname = true;
        System.out.println("CONTENTTYPE: " + contenttype);
        if (part.isMimeType("text/plain") && !conname) {
            bodytext.append((String) part.getContent());
        } else if (part.isMimeType("text/html") && !conname) {
            bodytext.append((String) part.getContent());
        } else if (part.isMimeType("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")) {
            getMailContent((Part) part.getContent());
        } else {
        }
    }

    /**
     * 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"
     */
    public boolean getReplySign() throws MessagingException {
        boolean replysign = false;
        String needreply[] = mimeMessage
                .getHeader("Disposition-Notification-To");
        if (needreply != null) {
            replysign = true;
        }
        return replysign;
    }

    /**
     * 获得此邮件的Message-ID
     */
    public String getMessageId() throws MessagingException {
        return mimeMessage.getMessageID();
    }

    /**
     * 【判断此邮件是否已读,如果未读返回返回false,反之返回true】pop3协议使用时不能判断。
     */
    public boolean isNew() throws MessagingException {
        boolean isnew = false;//由于isnew设为false所以每次显示的都为未读
        Flags flags = ((Message) mimeMessage).getFlags();
        System.out.println("--------flags-------" + flags);
        Flags.Flag[] flag = flags.getSystemFlags();
        System.out.println("----flag----" + flag);
        System.out.println("flags's length: " + flag.length);
        for (int i = 0; i < flag.length; i++) {
            System.out.println("flag=======" + flag[i]);
            System.out.println("-=-=-=Flags.Flag.SEEN=-=-=-="+Flags.Flag.SEEN);
            if (flag[i] == Flags.Flag.SEEN) {
                isnew = true;
                System.out.println("seen Message.......");
                break;
            }
        }
        return isnew;
    }

    /**
     * 判断此邮件是否包含附件
     */
    @SuppressLint("DefaultLocale")
    public boolean isContainAttach(Part part) throws Exception {
        boolean attachflag = false;
        // String contentType = part.getContentType();
        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】
     */
    @SuppressLint("DefaultLocale")
    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);//主体部分得到处理
                String disposition = mpart.getDisposition();
                if ((disposition != null)
                        && ((disposition.equals(Part.ATTACHMENT)) || (disposition
                                .equals(Part.INLINE)))) {//ATTACHMENT附件,INLINE嵌入
                    fileName = mpart.getFileName();
                    if (fileName.toLowerCase().indexOf("gb18030") != -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("GB18030") != -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】
     */

    public void setAttachPath(String attachpath) {
        this.saveAttachPath = attachpath;
    }

    /**
     * 【设置日期显示格式】
     */
    public void setDateFormat(String format) throws Exception {
        this.dateformat = format;
    }

    /**
     * 【获得附件存放路径】
     */
    public String getAttachPath() {
        return saveAttachPath;
    }

    /**
     * 【真正的保存附件到指定目录里】
     */
    @SuppressLint("DefaultLocale")
    private void saveFile(String fileName, InputStream in) throws Exception {
        String osName = System.getProperty("os.name");
        System.out.println("----fileName----" + fileName);
        // String storedir = getAttachPath();
//        String separator = "";
        if (osName == null)
            osName = "";
        File storefile = new File(File.separator + "mnt" + File.separator
                + "sdcard" + File.separator + fileName);

        storefile.createNewFile();
        System.out.println("storefile's path: " + storefile.toString());
//         for(int i=0;storefile.exists();i++){
//         storefile = new File(storedir+separator+fileName+i);
//         }

        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();
        }
    }
}