java解析邮件并下载附件

package com.testspring.mailserver.mail.parsemail;

import com.sun.mail.pop3.POP3Folder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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

@RestController
@RequestMapping("/mail")
public class ParseMailService {

    @RequestMapping("/parsemail")
    public void run(){
    	// 如邮箱地址为taotao@163.com ，则这里的名称只需要填taotao
    	// 授权码不等于密码，授权码获取，需要自行百度，qq邮箱有qq邮箱的方式，163有163的方式
        this.parsemail01("邮箱的名称","邮箱的授权码");
    }

    public void parsemail01(String mailname,String pwd){
        try{
            // 链接邮箱
            Session session = Session.getInstance(new Properties());
            Store store = session.getStore("pop3");
            // 这里163.com 可以更改，你用qq 或者其他邮箱，就更改其他的.com
            store.connect("pop3.163.com",110,mailname,pwd);
            Folder folder = store.getFolder("inbox");
            folder.open(Folder.READ_ONLY);
            Message message[] = folder.getMessages();
            POP3Folder inbox = (POP3Folder) folder;
            PraseMimeMessage pmm = null;
            System.out.println(" 正在收取邮箱" + mailname+ "的邮件，开始下载相应附件到本地");
            for(int i = message.length -1; i >= 0; i--){
             // 可在此地书写自己的业务逻辑
                pmm = new PraseMimeMessage((MimeMessage) message[i]);
                pmm = new PraseMimeMessage((MimeMessage) message[i]);
                System.out.println("Message " + i + " subject: " + pmm.getSubject());
                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"));
                pmm.setDateFormat("yy年MM月dd日 HH:mm");
                pmm.getMailContent((Part) message[i]);
                System.out.println("Message " + i + " bodycontent: \r\n"+ pmm.getBodyText());
                File file = new File("e:\\tmp\\");
                if (!file.exists()) {
                    file.mkdirs();
                }
                pmm.setAttachPath(file.toString());
                pmm.saveAttachMent((Part) message[i]);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

邮箱工具类

package com.testspring.mailserver.mail.parsemail;

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

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

    /**
     * 构造函数,初始化一个MimeMessage对象
     */
    public PraseMimeMessage() {
    }

    public PraseMimeMessage(MimeMessage mimeMessage) {
        this.mimeMessage = mimeMessage;
        System.out.println("create a PraseMimeMessage object........");
    }

    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
     */
    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
     */
    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】
     */
    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;
    }

    /**
     * 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) 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);
                    }else {
                        fileName = MimeUtility.decodeWord(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】
     */
    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】
     */
    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("storefile's path: " + 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();
        }
    }
}

程序执行之后，会将邮件内的附件下载到本地，如需要解析它或者读成流的形式入库，则需要用不同的方式自行实现。