javaMail 收取邮件，邮件获取，并保存附件

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package com.frame.mall.core.mail;

/**
 */

import java.text.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

/**
 * 有一封邮件就需要建立一个ReciveMail对象
 */
public class ReciveMail {
    private MimeMessage mimeMessage = null;
    private final String dateformat = "yy-MM-dd HH:mm"; //默认的日前显示格式


    private String saveAttachPath; //附件下载后的存放目录
    private String host;   //smtp.126.com  的host
    private int port;      //收件服务器  端口
    private String file;
    private String username;   //邮箱账户
    private String password;   //授权的密码
    private String popHost;   //pop3的host pop.126.com

    private StringBuffer bodytext = new StringBuffer();//存放邮件内容

    public ReciveMail() {
    }

    public ReciveMail(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
     */
    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;
    }

    /**
     * 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】
     */
    public boolean isNew() throws MessagingException {
        boolean isnew = false;
        Flags flags = ((Message) mimeMessage).getFlags();
        Flags.Flag[] flag = flags.getSystemFlags();
        System.out.println("flags's length: " + flag.length);
        for (int i = 0; i < flag.length; i++) {
            if (flag[i] == Flags.Flag.SEEN) {
                isnew = true;
                System.out.println("seen Message.......");
                break;
            }
        }
        return isnew;
    }


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

    public MimeMessage getMimeMessage() {
        return mimeMessage;
    }

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

    public StringBuffer getBodytext() {
        return bodytext;
    }

    public void setBodytext(StringBuffer bodytext) {
        this.bodytext = bodytext;
    }

    public String getPopHost() {
        return popHost;
    }

    public void setPopHost(String popHost) {
        this.popHost = popHost;
    }

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    public String getFile() {
        return file;
    }

    public void setFile(String file) {
        this.file = file;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


    /**
     * 【设置附件存放路径】
     */

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


    /**
     * 获得邮件正文内容
     */
    public String getBodyText() {
        return bodytext.toString();
    }

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

}

/**工具类****/

package com.frame.mall.core.mail;

import javax.mail.*;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import java.io.*;
import java.util.Properties;

/**
 * Created by xxon 2017/4/6.
 */
public class ReciveMailUtil {
    private StringBuffer bodytext = new StringBuffer();//存放邮件内容

    public ReciveMailUtil() {
    }

    private static ReciveMailUtil reciveMailUtil;


    /**
     *
     * @return
     */
    public static ReciveMailUtil getInstance() {
        if (reciveMailUtil == null) {
            synchronized (ReciveMailUtil.class) {
                if (reciveMailUtil == null) {
                    reciveMailUtil = new ReciveMailUtil();
                }
            }
        }
        return reciveMailUtil;
    }

    /**
     * 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, ReciveMail reciveMail) 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());
            reciveMail.setBodytext(bodytext);
        } else if (part.isMimeType("text/html") && !conname) {
            bodytext.append((String) part.getContent());
            reciveMail.setBodytext(bodytext);
        } 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), reciveMail);
            }
        } else if (part.isMimeType("message/rfc822")) {
            getMailContent((Part) part.getContent(), reciveMail);
        } else {
        }
    }


    /**
     * 判断此邮件是否包含附件
     */
    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】
     */
    public void saveAttachMent(Part part, ReciveMail reciveMail) 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(), reciveMail);
                } else if (mpart.isMimeType("multipart/*")) {
                    saveAttachMent(mpart, reciveMail);
                } else {
                    fileName = mpart.getFileName();
                    if ((fileName != null)
                            && (fileName.toLowerCase().indexOf("GB2312") != -1)) {
                        fileName = MimeUtility.decodeText(fileName);
                        saveFile(fileName, mpart.getInputStream(), reciveMail);
                    }
                }
            }
        } else if (part.isMimeType("message/rfc822")) {
            saveAttachMent((Part) part.getContent(), reciveMail);
        }
    }

    /**
     * 【真正的保存附件到指定目录里】
     */
    private void saveFile(String fileName, InputStream in, ReciveMail reciveMail) throws Exception {
        String osName = System.getProperty("os.name");
        String storedir = reciveMail.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("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();
        }
    }


    public static void reciveMail(ReciveMail pmm,String fileSavePath) throws Exception {
        Properties props = System.getProperties();
            /*
                    props.put("mail.smtp.host", pmm.getHost());//收件不需要这个
            */
        props.put("mail.smtp.auth", "true");
        Session session = Session.getDefaultInstance(props, null);
        URLName urln = new URLName("pop3", pmm.getPopHost(), pmm.getPort(), pmm.getFile(), pmm.getUsername(), pmm.getPassword());
        Store store = session.getStore(urln);
        store.connect();
        Folder folder = store.getFolder("INBOX");
        folder.open(Folder.READ_ONLY);
        Message message[] = folder.getMessages();
        System.out.println("Messages's length: " + message.length);
        for (int i = 0; i < message.length; i++) {
            System.out.println("==========第" + (i + 1) + "份邮件============");
            pmm = new ReciveMail((MimeMessage) message[i]);
            System.out.println(" 主题: " + pmm.getSubject());
            System.out.println(" 发送日期: " + pmm.getSentDate());
            System.out.println(" 是否需要回执: " + pmm.getReplySign());
            System.out.println(" 是否已读: " + pmm.isNew());
            System.out.println(" 是否包含文件: " + getInstance().isContainAttach((Part) message[i]));
            System.out.println(" 谁发送的: " + pmm.getFrom());
            System.out.println(" 发送给谁的: " + pmm.getMailAddress("to"));
            System.out.println(" 抄送: " + pmm.getMailAddress("cc"));
            System.out.println(" 密件抄送: " + pmm.getMailAddress("bcc"));
            System.out.println("ID: " + pmm.getMessageId());
            // 获得邮件内容===============
            getInstance().getMailContent((Part) message[i], pmm);
            String content = pmm.getBodyText().substring(pmm.getBodyText().indexOf("<"), pmm.getBodyText().lastIndexOf(">") + 1);
            System.out.println(" 内容: \r\n" + content);
            pmm.setAttachPath(fileSavePath);
            getInstance().saveAttachMent((Part) message[i], pmm);
        }
    }

    /**
     * PraseMimeMessage类测试
     */
    public static void main(String args[]) throws Exception {
        ReciveMail pmm = new ReciveMail();
        String popHost = "pop.126.com";
        int port = 110;//端口
        String file = null;
        String username = "[email protected]";
        String password = "授权密码";


        pmm.setPopHost(popHost);
        pmm.setPort(port);
        pmm.setFile(file);
        pmm.setUsername(username);
        pmm.setPassword(password);
        reciveMail(pmm,"D:\\");//记得设置文件保存路径
    }
}