使用 JavaMail 实现邮件发送与收取

亦凉 2022-07-26 11:15 155阅读 0赞

**因为上一篇已经实现了James的配置，那接下来就是利用javaMail实现邮件的发送和收取。**

**发送邮件的代码：**

package com.ge.test;
    import java.util.Properties;      
    import javax.activation.DataHandler;      
    import javax.activation.DataSource;      
    import javax.activation.FileDataSource;      
    import javax.mail.Message;      
    import javax.mail.MessagingException;      
    import javax.mail.Session;      
    import javax.mail.Transport;      
    import javax.mail.URLName;      
    import javax.mail.internet.AddressException;      
    import javax.mail.internet.InternetAddress;      
    import javax.mail.internet.MimeBodyPart;      
    import javax.mail.internet.MimeMessage;      
    import javax.mail.internet.MimeMultipart;      
    public class SendMail {      
        public SendMail() {      
       
        }      
        public static void main(String[] args) {      
            // 初始化信息      
            String sender = "qiang"; //用户名
            String password = "qiang";//用户密码      
            String smtpServer = "42.96.155.24";   //邮件服务器所在的IP地址，必须是外网IP   
            String recipient = "208017534@qq.com";//邮件收件人地址
            String subject = "测试邮件主题";      
            String fileAttachment = "E:/test.zip";   //附件，注意是从本地上传的！
            String content = "<h1>测试邮件内容</h1>";     
            // 配置服务器属性      
            Properties proper = new Properties();      
            proper.put("mail.smtp.host", smtpServer); // smtp服务器      
            proper.put("mail.smtp.auth", "true"); // 是否smtp认证      
            proper.put("mail.smtp.port", "25"); // 设置smtp端口      
            proper.put("mail.transport.protocol", "smtp"); // 发邮件协议    pop3 smtp NNTP
            proper.put("mail.store.protocol", "pop3"); // 收邮件协议      
            // 配置邮件接收地址      
            InternetAddress[] receiveAddress = new InternetAddress[1];      
            try {      
                receiveAddress[0] = new InternetAddress(recipient);      
            } catch (AddressException e) {       
                e.printStackTrace();      
            }      
            // smtp认证，获取Session      
            SmtpAuth sa = new SmtpAuth();      
            sa.setUserinfo(sender, password);      
            Session session = Session.getInstance(proper, sa);      
            session.setPasswordAuthentication(new URLName(smtpServer), sa      
                    .getPasswordAuthentication());      
            // 构建邮件体      
            MimeMessage sendMess = new MimeMessage(session);      
            MimeBodyPart mbp = new MimeBodyPart();      
            MimeMultipart mmp = new MimeMultipart();      
            try {      
                // 邮件文本内容      
                mbp.setContent(content, "text/html; charset=GBK");      
                mmp.addBodyPart(mbp);      
                // 附件处理      
                if(fileAttachment!=null&&fileAttachment!=""){      
                    DataSource source = new FileDataSource(fileAttachment);      
                    String name = source.getName();      
                    mbp = new MimeBodyPart();      
                    mbp.setDataHandler(new DataHandler(source));      
                    mbp.setFileName(name);      
                    mmp.addBodyPart(mbp);      
                }      
                // 邮件整体      
                sendMess.setSubject(subject);      
                sendMess.setContent(mmp);      
                // 发送邮件      
                sendMess.setSender(new InternetAddress("qiang@42.96.155.24")); //注意这个很重要，能否成功发送的关键代码。如果不写则会显示代发，会被屏蔽掉。
                sendMess.setRecipients(Message.RecipientType.TO, receiveAddress);
                Transport.send(sendMess); 
                System.out.println("发送成功");      
            } catch (MessagingException ex) {      
                ex.printStackTrace();      
            }      
        }      
    }

**如果James配置不成功的话是不能像外网发送邮件，或者接收外网的邮件的，这点很重要。**

**接收邮件代码：**

package com.ge.test;
    import java.io.*;   
    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 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  
         */  
        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) {   
    //        	System.out.println("text/plain");
                bodytext.append((String) part.getContent());   
            } else if (part.isMimeType("text/html") && !conname) {   
    //        	System.out.println("text/html");
               bodytext.append((String) part.getContent());   
            } else if (part.isMimeType("multipart/*")) {   
    //        	System.out.println("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")) {   
    //        	System.out.println("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 {  
        	System.out.println("login......saveAttachMent................");
            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());   
                    } 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 {   
        	System.out.println("login.........saveFile...........");
            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());  
            // 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();  
                }  
                System.out.println("写入成功。。。。。。。。");
            } 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 {  
            Properties props = System.getProperties();  
            props.put("mail.smtp.host", "42.96.155.24");  
            props.put("mail.smtp.auth", "true");  
            Session session = Session.getDefaultInstance(props, null);  
            URLName urln = new URLName("pop3", "42.96.155.24", 110, null,  
                    "qiang", "220316");  
            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);  
            ReciveOneMail pmm = null;  
           for (int i = 0; i < message.length; i++) {  
                System.out.println("======================");  
                pmm = new ReciveOneMail((MimeMessage) message[1]);  
                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 " + i + " hasRead: " + pmm.isNew());  
                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[1]);  
                System.out.println("Message " + 1 + " bodycontent: \r\n"  
                        + pmm.getBodyText());  
                pmm.setAttachPath("c:\\");   
                pmm.saveAttachMent((Part) message[i]); //注意下载是下载到本地磁盘的，而不是云上面的服务器的。
            }   
        }   
    }  
    
    <strong><span style="font-size:14px;">
    </span></strong>

**这样利于java发送邮件或者接收邮件的功能就实现了，当然这主要是实现邮件系统中一些简单的功能，如果大家想做更多或者更复杂的功能还是说代码有问题可以联系我**

**这是我QQ：208017534  。欢迎大家一起学习，一起进步。**