JavaMail通过IMAP和POP3接收未读以及设置已读邮件

使用javaMail收邮件主要有两种协议,一种是pop3,一种是imap。这两种协议都可以用来收邮件,但是在其中的处理上是有区别的。pop3是不支持判断邮件是否为已读的,也就是说你不能直接从收件箱里面取到未读邮件,这需要自己进行判断,然而imap就提供了这样的功能,使用imap时可以很轻松的判断该邮件是否为已读或未读或其他。

此外收件箱中的每一封邮件都对应着一个MessageNumber,所以可以通过一个MessageNumber拿到对应的那封邮件。如:Message message = folder.getMessage(messageNumber);

pop3和imap主要区别就是能否判断邮件状态的问题,其他的操作都差不多.

pop3收邮件和解析邮件:
    package com.clxx.test;  
      
    import java.io.FileOutputStream;  
    import java.io.IOException;  
    import java.io.InputStream;  
    import java.io.OutputStream;  
    import java.util.Enumeration;  
    import java.util.Properties;  
      
    import javax.mail.BodyPart;  
    import javax.mail.Folder;  
    import javax.mail.Message;  
    import javax.mail.MessagingException;  
    import javax.mail.Multipart;  
    import javax.mail.Session;  
    import javax.mail.Store;  
    import javax.mail.internet.MimeMultipart;  
      
    public class Email2 {  
      
        public static void main(String args[]) throws MessagingException,  
                IOException {  
            Properties props = new Properties();  
            props.setProperty("mail.store.protocol", "pop3");  
            props.setProperty("mail.pop3.host", "pop3.sohu.com");  
            Session session = Session.getDefaultInstance(props);  
            Store store = session.getStore("pop3");  
            store.connect("[email protected]", "password");  
            Folder folder = store.getFolder("INBOX");  
            folder.open(Folder.READ_WRITE);  
      
            // 全部邮件数  
            int messageCount = folder.getMessageCount();  
            System.out.println(messageCount);  
            Message[] messages = folder.getMessages();  
            for (int i = 0; i < messages.length; i++) {  
                Message message = messages[i];  
                System.out.println(message.getSubject());  
                // 删除邮件  
                // message.setFlag(Flags.Flag.DELETED, true);  
                // 标记为已读  
                // message.setFlag(Flags.Flag.SEEN, true);  
                  
                //pop3没有判断邮件是否为已读的功能,要使用Imap才可以  
                /*Flags flags = message.getFlags(); 
                if (flags.contains(Flags.Flag.SEEN)) 
                    System.out.println("这是一封已读邮件"); 
                else { 
                    System.out.println("未读邮件"); 
                    message.setFlag(Flags.Flag.SEEN, true); 
                }*/  
                System.out.println("发送时间:" + message.getSentDate());  
                System.out.println("主题:" + message.getSubject());  
                System.out.println("内容:" + message.getContent());  
                //获取所有的Header,头信息  
                Enumeration headers = message.getAllHeaders();  
                System.out.println("----------------------allHeaders-----------------------------");  
            /*  while (headers.hasMoreElements()) { 
                    Header header = (Header)headers.nextElement(); 
                    System.out.println(header.getName()+" ======= "+header.getValue()); 
                }*/  
                  
                //解析邮件内容  
                Object content = message.getContent();  
                if (content instanceof MimeMultipart) {  
                    MimeMultipart multipart = (MimeMultipart) content;  
                    parseMultipart(multipart);  
                }  
                System.out  
                        .println("========================================================");  
                System.out  
                        .println("========================================================");  
      
            }  
      
            folder.close(true);  
            store.close();  
        }  
          
        /** 
         * 对复杂邮件的解析 
         * @param multipart 
         * @throws MessagingException 
         * @throws IOException 
         */  
        public static void parseMultipart(Multipart multipart) throws MessagingException, IOException {  
            int count = multipart.getCount();  
            System.out.println("couont =  "+count);  
            for (int idx=0;idx<count;idx++) {  
                BodyPart bodyPart = multipart.getBodyPart(idx);  
                System.out.println(bodyPart.getContentType());  
                if (bodyPart.isMimeType("text/plain")) {  
                    System.out.println("plain................."+bodyPart.getContent());  
                } else if(bodyPart.isMimeType("text/html")) {  
                    System.out.println("html..................."+bodyPart.getContent());  
                } else if(bodyPart.isMimeType("multipart/*")) {  
                    Multipart mpart = (Multipart)bodyPart.getContent();  
                    parseMultipart(mpart);  
                      
                } else if (bodyPart.isMimeType("application/octet-stream")) {  
                    String disposition = bodyPart.getDisposition();  
                    System.out.println(disposition);  
                    if (disposition.equalsIgnoreCase(BodyPart.ATTACHMENT)) {  
                        String fileName = bodyPart.getFileName();  
                        InputStream is = bodyPart.getInputStream();  
                        copy(is, new FileOutputStream("D:\\"+fileName));  
                    }  
                }  
            }  
        }  
          
        /**  
         * 文件拷贝,在用户进行附件下载的时候,可以把附件的InputStream传给用户进行下载  
         * @param is  
         * @param os  
         * @throws IOException  
         */  
        public static void copy(InputStream is, OutputStream os) throws IOException {  
            byte[] bytes = new byte[1024];  
            int len = 0;  
            while ((len=is.read(bytes)) != -1 ) {  
                os.write(bytes, 0, len);  
            }  
            if (os != null)  
                os.close();  
            if (is != null)  
                is.close();  
        }  
    }  






使用imap协议接收邮件:

  
 package com.clxx.test;  
      
    import java.util.Properties;  
      
    import javax.mail.Flags;  
    import javax.mail.Folder;  
    import javax.mail.Message;  
    import javax.mail.Session;  
      
    import com.sun.mail.imap.IMAPFolder;  
    import com.sun.mail.imap.IMAPStore;  
      
    /** 
     * 使用imap协议获取未读邮件数 
     *  
     * @author w 
     *  
     */  
    public class Email3 {  
      
        public static void main(String[] args) throws Exception {  
            String user = "[email protected]";// 邮箱的用户名  
            String password = "password"; // 邮箱的密码  
      
            Properties prop = System.getProperties();  
            prop.put("mail.store.protocol", "imap");  
            prop.put("mail.imap.host", "imap.sohu.com");  
      
            Session session = Session.getInstance(prop);  
              
            int total = 0;  
            IMAPStore 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  
            System.out.println("未读邮件数:" + folder.getUnreadMessageCount());  
            Message[] messages = folder.getMessages();  
            int messageNumber = 0;  
            for (Message message : messages) {  
                System.out.println("发送时间:" + message.getSentDate());  
                System.out.println("主题:" + message.getSubject());  
                System.out.println("内容:" + message.getContent());  
                Flags flags = message.getFlags();  
                if (flags.contains(Flags.Flag.SEEN))  
                    System.out.println("这是一封已读邮件");  
                else {  
                    System.out.println("未读邮件");  
                }  
                System.out  
                        .println("========================================================");  
                System.out  
                        .println("========================================================");  
                //每封邮件都有一个MessageNumber,可以通过邮件的MessageNumber在收件箱里面取得该邮件  
                messageNumber = message.getMessageNumber();  
            }  
            Message message = folder.getMessage(messageNumber);  
            System.out.println(message.getContent()+message.getContentType());  
            // 释放资源  
            if (folder != null)  
                folder.close(true);   
            if (store != null)  
                store.close();  
        }  
      
    }  


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