Java 接收邮件(解码技术和附件接收)

邮件发送和接收已经全部实现，大家在转发市请注明出处(我这也是参考了N多大牛的作品)：

http://www.blogjava.net/stevenjohn/archive/2011/10/17/361491.html

//附件接收实现代码：import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.Properties;import javax.mail.BodyPart;import javax.mail.Flags;import javax.mail.Folder;import javax.mail.Message;import javax.mail.MessagingException;import javax.mail.Multipart;import javax.mail.Part;import javax.mail.Session;import javax.mail.Store;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import javax.mail.internet.MimeUtility;/** * @author Administrator *  */public class PraseMimeMessage {    private MimeMessage mimeMessage = null;    private String saveAttachPath = "d:\\";// 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;    }    /**     *      * 获取发件人的姓名和密码     *      * @return     */    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;    }    /**     *      * 获取邮件主题     */    public String getSubject() throws MessagingException {        String subject = "";        try {            subject = MimeUtility.decodeText(mimeMessage.getSubject());            if (subject == null)                subject = "";        } catch (Exception exce) {        }        return subject;    }    /*     * 获取邮件发送日期     *      */    public java.util.Date getSentDate() throws Exception {        Date sentdate = mimeMessage.getSentDate();        SimpleDateFormat format = new SimpleDateFormat(dateformat);        return sentdate;    }    /**     * 获取邮件正文     *      * @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     *      *      */    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;    }    //base64解码    private static String base64Decoder(String s) throws Exception {        sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();        byte[] b = decoder.decodeBuffer(s);        return (new String(b));    }    /*     * 保存附件     *      */    public String 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();                     /*System.out.println(fileName);                     fileName=fileName.substring(fileName.indexOf("=?GBK?B?"));                     System.out.println(fileName);                     fileName=fileName.substring(0, fileName.length()-2);                     System.out.println(fileName);*///                     .substring(fileName.lastIndexOf("=?GBK?B?"), fileName.indexOf("?="));                     String s = fileName.substring(8, fileName.indexOf("?="));;                     fileName = base64Decoder(s);                    if (fileName.toLowerCase().indexOf("gb2312") != -1) {                        fileName = MimeUtility.decodeText(fileName);                    }                    // saveFile(fileName,mpart.getInputStream());                    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());        }        return fileName;    }    /**     * 【设置附件存放路径】     */    public void setAttachPath(String attachpath) {        this.saveAttachPath = attachpath;    }    /**     *      * 设置日期显示本格式     */    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();        }    }    /**     * PraseMimeMessage类测试     */    public static void main(String args[]) throws Exception {        String host = "POP3.163.com";// 【POP3.163.com】        String username = "li";// 【yuxia2217】        String password = "***";// 【........】        Properties props = new Properties();        Session session = Session.getDefaultInstance(props, null);        Store store = session.getStore("pop3");        store.connect(host, username, password);        Folder folder = store.getFolder("INBOX");        folder.open(Folder.READ_ONLY);        Message message[] = folder.getMessages();        System.out.println("Messages's　length:　" + message.length);        PraseMimeMessage pmm = null;        for (int i = 0; i < message.length; i++) {            pmm = new PraseMimeMessage((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());            System.out.println("Message　新的" + i + "　hasRead:　" + pmm.isNew());            System.out.println("Message　附件" + 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());            pmm.getMailContent((Part) message[i]);            System.out.println("Message　正文" + i + "　bodycontent:　\r\n"                    + pmm.getBodyText());            pmm.setAttachPath("D:\\image");            pmm.saveAttachMent((Part) message[i]);                    }    }    public List receive(MailInfo mailInfo)throws Exception{        List list=new ArrayList();        Properties props = new Properties();        Session session = Session.getDefaultInstance(props, null);        Store store = session.getStore("pop3");        store.connect(mailInfo.getHost(), mailInfo.getUsername(), mailInfo.getPassword());        Folder folder = store.getFolder("INBOX");        folder.open(Folder.READ_ONLY);        Message message[] = folder.getMessages();    //    System.out.println("Messages's　length:　" + message.length);        PraseMimeMessage pmm = null;        for (int i = 0; i < message.length; i++) {            MailInfo mail=new MailInfo();            mail.setMailnumber(message.length);            pmm = new PraseMimeMessage((MimeMessage) message[i]);//            System.out//                    .println("Message　" + i + "　subject:　" + pmm.getSubject());            mail.setSubject(message[i].getSubject());//            System.out.println("Message　" + i + "　sentdate:　"//                    + pmm.getSentDate());            mail.setSentdate(pmm.getSentDate());//            System.out.println("Message　" + i + "　replysign:　"//                    + pmm.getReplySign());            mail.setReplysign(pmm.getReplySign());//            System.out.println("Message　新的" + i + "　hasRead:　" + pmm.isNew());//            mail.setRead(pmm.isNew());//            System.out.println("Message　附件" + i + "　　containAttachment:　"//                    + pmm.isContainAttach((Part) message[i]));            mail.setExistsFile(pmm.isContainAttach((Part) message[i]));//            System.out.println("Message　" + i + "　form:　" + pmm.getFrom());            mail.setFromAddress(pmm.getFrom().substring(1, pmm.getFrom().length()).replaceAll(">", ""));//            System.out.println("Message　" + i + "　to:　"//                    + pmm.getMailAddress("to"));            mail.setToAddress(pmm.getMailAddress("to").substring(1, pmm.getMailAddress("to").length()).replaceAll(">", ""));//            System.out.println("Message　" + i + "　cc:　"//                    + pmm.getMailAddress("cc"));//            mail.setMailauthor(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());            mail.setMessageid(pmm.getMessageId());            pmm.getMailContent((Part) message[i]);//            System.out.println("Message　正文" + i + "　bodycontent:　\r\n"//                    + pmm.getBodyText());            mail.setContent(pmm.getBodyText());            pmm.setAttachPath(mailInfo.getFilepath());            String fileName=pmm.saveAttachMent((Part) message[i]);            mail.setFilename(fileName);            String receivepath=mailInfo.getFilepath()+"\\"+fileName;            mail.setReceivepath(receivepath);            list.add(mail);    }        return list;}}//接收邮件测试类import java.util.List;import org.junit.After;import org.junit.Before;import org.junit.Test;public class ReceiveTest{    @Before    public void setUp() throws Exception {    }    @After    public void tearDown() throws Exception {    }    @Test    public void ReceiveMailTest()throws Exception{        MailInfo mailInfo=new MailInfo();        mailInfo.setHost("pop.163.com");        mailInfo.setUsername("liposter");        mailInfo.setPassword("**********");        mailInfo.setFilepath("D:\\image");        List list=new PraseMimeMessage().receive(mailInfo);        for(int i=0;i  
  
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