Javamail使用代码整理

package com.hengrun.mail;

import java.io.*;
import java.security.Security;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

import javax.mail.*;
import javax.mail.internet.*;

import sun.misc.BASE64Decoder;

public class MailReceive {
    
    public MailReceive(){
        
    }
    
    private Folder inbox = null;
    
    private String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; 
    
    //获取所有邮件
    public String getMails(int page,String username,String pass){
        int pageNum = 10;
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        Properties props = System.getProperties();
        props.setProperty("mail.imap.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.store.protocol", "imap"); 
        props.setProperty("mail.imap.host", "imap.exmail.qq.com"); 
        props.setProperty("mail.imap.port", "993");
        props.setProperty("mail.imap.socketFactory.port", "993");
        
        Session session = Session.getDefaultInstance(props,null);
        
        URLName urln = new URLName("imap","imap.exmail.qq.com",993,null,
                username, pass);
        
        Store store = null;
        String msg = "";
        
        try {
            store = session.getStore(urln);
            store.connect();
            inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);
            FetchProfile profile = new FetchProfile();
            profile.add(FetchProfile.Item.ENVELOPE);
            Message[] messages = inbox.getMessages();
            inbox.fetch(messages, profile);
            
            //计算页数
            int all = inbox.getMessageCount();
            int pages = all/pageNum;
            if(all%pageNum>0){
                pages++;
            }
            int begin = all-((page-1)*pageNum);
            
            
            
            for (int i = begin-1; i > (begin-pageNum)&&i>=0; i--) {
                //邮件发送者
                String from = decodeText(messages[i].getFrom()[0].toString());
                msg += messages[i].getMessageNumber()+"&";
                InternetAddress ia = new InternetAddress(from);
                msg+=ia.getPersonal()+"&";
                msg+=ia.getAddress()+"&";
                //邮件标题
                msg+=messages[i].getSubject()+"&";
                //邮件大小
                msg+=messages[i].getSize()+"&";
                //邮件发送时间
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                msg+=format.format(messages[i].getSentDate())+";";
                
                //判断是否由附件
//                if(messages[i].isMimeType("multipart/*")){
//                    Multipart multipart = (Multipart)messages[i].getContent();
//                    int bodyCounts = multipart.getCount();
//                    for(int j = 0; j < bodyCounts; j++) {
//                        BodyPart bodypart = multipart.getBodyPart(j);
//                        if(bodypart.getFileName() != null){
//                            String filename = bodypart.getFileName(); 
//                            if(filename.startsWith("=?")){
//                                filename = MimeUtility.decodeText(filename);
//                            }
//                            msg+=filename+"<br/>";
//                        }
//                    }
//                }
            }
        } catch (MessagingException | IOException e) {
            // TODO Auto-generated catch block
            msg = "0";
        } finally{
            try {
                inbox.close(false);
                store.close();
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                //e.printStackTrace();
            }finally{
                return msg;
            }
        }
    }
    
    protected static String decodeText(String text) throws UnsupportedEncodingException{
        if (text == null){
            return null;
        }
        if (text.startsWith("=?GB") || text.startsWith("=?gb")){
            text = MimeUtility.decodeText(text);
        }else{
            text = new String(text.getBytes("ISO8859_1"));
        }
        return text;
    }
    
    
    //附件下载到服务器
    public void getAtth(int msgnum,int bodynum,String filename,String mailpath) throws MessagingException, IOException{
        Message message = inbox.getMessage(msgnum);
        Multipart multipart = (Multipart)message.getContent(); 
        BodyPart bodypart = multipart.getBodyPart(bodynum); 
        InputStream input = bodypart.getInputStream();
        byte[] buffer = new byte[input.available()];
        input.read(buffer);
        input.close();
        
        File file = new File("D:\App\MailFile\"+mailpath);
        if(!file.isDirectory()&&!file.exists()){
            file.mkdir();
        }
        
        FileOutputStream fos = new FileOutputStream(filename);
        fos.write(buffer);
        fos.close();
    }
    
    //获得单个邮件信息
    public String getMail(int id,final String username,final String pass) throws MessagingException, IOException{
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        Properties props = System.getProperties();
        props.setProperty("mail.imap.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.store.protocol", "imap"); 
        props.setProperty("mail.imap.host", "imap.exmail.qq.com"); 
        props.setProperty("mail.imap.port", "993");
        props.setProperty("mail.imap.socketFactory.port", "993");
        
        Session session = Session.getDefaultInstance(props,null);
        
        URLName urln = new URLName("imap","imap.exmail.qq.com",993,null,
                username, pass);
        
        Store store = session.getStore(urln);
        store.connect();
        inbox = store.getFolder("INBOX");
        inbox.open(Folder.READ_ONLY);
        FetchProfile profile = new FetchProfile();
        profile.add(FetchProfile.Item.ENVELOPE);
        
        Message message = inbox.getMessage(id);
        
        String msg = "";
        
        msg+=message.getMessageNumber()+"&#@";
        msg+=message.getSubject()+"&#@";
        msg+=new InternetAddress(message.getFrom()[0].toString()).getAddress()+"&#@";
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        msg+=format.format(message.getSentDate())+"&#@";
        
        //判断是否由附件
        if(message.isMimeType("multipart/*")){
            Multipart multipart = (Multipart)message.getContent();
            int bodyCounts = multipart.getCount();
            for(int j = 0; j < bodyCounts; j++) {
                BodyPart bodypart = multipart.getBodyPart(j);
                if(bodypart.getContent()!=null){
                    msg+=bodypart.getContent()+"&#@";
                }
            }
        }else{
            msg+=message.getContent().toString()+"&#@";
        }
        
        if(message.isMimeType("multipart/*")){
            Multipart multipart = (Multipart)message.getContent();
            int bodyCounts = multipart.getCount();
            for(int j = 0; j < bodyCounts; j++) {
                BodyPart bodypart = multipart.getBodyPart(j);
                if(bodypart.getFileName() != null){
                    String filename = bodypart.getFileName(); 
                    if(filename.startsWith("=?")){
                        filename = MimeUtility.decodeText(filename);
                    }
                    msg+=filename+";";
                }
            }
        }
        
        store.close();
        return msg;
    }
    
    //发送邮件
    public String sendmail(final String username,final String pass,String from,String to,String subject,String content){
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        Properties props = System.getProperties();
        props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.smtp.socketFactory.fallback", "false");
        props.setProperty("mail.store.protocol", "smtp"); 
        props.setProperty("mail.smtp.host", "smtp.exmail.qq.com"); 
        props.setProperty("mail.smtp.port", "465");
        props.setProperty("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.auth", "true");
        Session session = Session.getInstance(props, new Authenticator(){
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, pass);
            }});
        
        Message msg = new MimeMessage(session);
        try {
            msg.setFrom(new InternetAddress(username));
            msg.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(to,false));
            msg.setSubject(subject);
            msg.setText(content);
            msg.setSentDate(new Date());
            Transport.send(msg);
            return "1";
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            return e.getMessage();
        }finally{
            
        }
    }
    
    //Base64
    public static String decryptBASE64(String key) throws Exception {    
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] bt = decoder.decodeBuffer(key);
        return new String(bt,"GBK");
    }
    
    //新邮件提醒
    public int MailMsg(String username,String pass){
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        Properties props = System.getProperties();
        props.setProperty("mail.imap.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.store.protocol", "imap"); 
        props.setProperty("mail.imap.host", "imap.exmail.qq.com"); 
        props.setProperty("mail.imap.port", "993");
        props.setProperty("mail.imap.socketFactory.port", "993");
        
        Session session = Session.getDefaultInstance(props,null);
        
        URLName urln = new URLName("imap","imap.exmail.qq.com",993,null,
                username, pass);
        
        Store store = null;
        int num = 0;
        
        try {
            store = session.getStore(urln);
            store.connect();
            inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);
            FetchProfile profile = new FetchProfile();
            profile.add(FetchProfile.Item.ENVELOPE);
            
            num = inbox.getMessageCount();
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            num = 0;
        }finally{
            try {
                inbox.close(false);
                store.close();
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
            }finally{
                return num;
            }
        }        
    }
}

package com.hengrun.mail;

import java.io.IOException;
import java.io.PrintWriter;

import javax.mail.MessagingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class MailMsg
 */
public class MailMsg extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public MailMsg() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        
        request.setCharacterEncoding("gbk");
        
        String username = request.getParameter("username");
        String pass = request.getParameter("pass");
        
        MailReceive mr = new MailReceive();
        
        int num = 0;
        PrintWriter out = null;
        
        num = mr.MailMsg(username, pass);
        
        response.setCharacterEncoding("gbk");
        response.setContentType("text/html; charset=gbk");
        response.setHeader("Pragma", "No-cache");
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control", "no-cache");
        
        out = response.getWriter();

        out.println(num);
        
        out.flush();
        out.close();
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        
        //设置request编码方式
        request.setCharacterEncoding("gbk");
        
        String username = request.getParameter("username");
        String pass = request.getParameter("pass");
        
        MailReceive mr = new MailReceive();
        
        int num = 0;
        PrintWriter out = null;
        
        num = mr.MailMsg(username, pass);
        
        response.setCharacterEncoding("gbk");
        response.setContentType("text/html; charset=gbk");
        response.setHeader("Pragma", "No-cache");
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control", "no-cache");
        
        out = response.getWriter();

        out.println(num);
        
        out.flush();
        out.close();
    }

}

带附件发送邮件

//发送邮件
    public String sendmail(final String username,final String pass,String from,String to,String subject,String content, String atthid) throws SQLException, ClassNotFoundException, UnsupportedEncodingException{
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        Properties props = System.getProperties();
        props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.setProperty("mail.smtp.socketFactory.fallback", "false");
        props.setProperty("mail.store.protocol", "smtp"); 
        props.setProperty("mail.smtp.host", "smtp.exmail.qq.com"); 
        props.setProperty("mail.smtp.port", "465");
        props.setProperty("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.auth", "true");
        Session session = Session.getInstance(props, new Authenticator(){
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, pass);
            }});
        
        Message msg = new MimeMessage(session);
        try {
            msg.setFrom(new InternetAddress(username));
            msg.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(to,false));
            msg.setSubject(subject);
            //msg.setContent(content, "text/html;charset=gb2312");
            msg.setSentDate(new Date());
            
            Multipart mt = new MimeMultipart();
            MimeBodyPart mbp = new MimeBodyPart();
            mbp.setContent(content, "text/html;charset=gb2312");
            mt.addBodyPart(mbp);
            if(atthid!=null&&!atthid.equals("")){
                List<Map> list = Utility.GetFiles(atthid);
                
                if(list!=null&&list.size()>0){
                    for(int i=0;i<list.size();i++){
                        MimeBodyPart fbp = new MimeBodyPart();
                        FileDataSource fds = new FileDataSource(((HashMap)list.get(i)).get("AnnexDirection").toString());
                        fbp.setDataHandler(new DataHandler(fds));
                        fbp.setFileName(MimeUtility.encodeText(((HashMap)list.get(i)).get("AnnexName").toString()));
                        
                        mt.addBodyPart(fbp);
                    }
                }
            }
            
            msg.setContent(mt);
            
            Transport.send(msg);
            return "1";
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            return e.getMessage();
        }finally{
            
        }
    }

 最新整理收邮件代码，通过UID收取新邮件及附近，已测试成功

private IMAPFolder inbox = null;
    
    private String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; 
    
    //获取新邮件
    public String getMails(String username,String pass,String server,String port,Boolean ssl){
        String num = "";
        Properties props = System.getProperties();
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.store.protocol", "imap"); 
        props.setProperty("mail.imap.host", server); 
        props.setProperty("mail.imap.port", port);
        props.setProperty("mail.imap.socketFactory.port", port);
        props.setProperty("mail.imap.auth.login.disable", "true");
        props.setProperty("mail.imap.auth.plain.disable", "true");
        
        if(ssl){
            Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
            props.setProperty("mail.imap.socketFactory.class", SSL_FACTORY);
        }
           
        Session session = Session.getDefaultInstance(props,null);
        
        URLName urln = new URLName("imap",server,Integer.parseInt(port),null,
                username, pass);
        
        Store store = null;
        String ids = "";
        
        try {
            store = session.getStore(urln);
            store.connect();
            inbox = (IMAPFolder)store.getFolder("inbox");
            inbox.open(Folder.READ_WRITE);
            //FetchProfile profile = new FetchProfile();
            //profile.add(FetchProfile.Item.ENVELOPE);
            //Message[] messages = inbox.getMessages();
            //inbox.fetch(messages, profile);
            Message[] msgs = inbox.getMessages();
            for(int i=0;i<msgs.length;i++){
                ids+="insert into #tmp (UID) values ("+inbox.getUID(msgs[i])+");";
            }
            List<Integer> list = Utility.GetUnreads(username, ids);
            int res = SaveMail(list, username);
            
            if(res<0){
                num="";
            }else{
                num = "ok";
            }
            
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            num = "";
        } finally{
            try {
                inbox.close(false);
                store.close();
            } catch (MessagingException e) {
                // TODO Auto-generated catch block
                //e.printStackTrace();
            }finally{
                return num;
            }
        }
    }
    
    
    public int SaveMail(List<Integer> list,String username){
        int num = 0;
        try{
            for(int i=0;i<list.size();i++){
                
                Message msg = inbox.getMessageByUID(list.get(i));

　　　　　　　　　　Address[] tos = msg.getRecipients(RecipientType.TO);
                String to = "";
                for(int j=0;j<tos.length;j++){
                    to+=getAdds(decodeText(tos[j].toString()));
                }
　　　　　　　　　　
                Address[] froms = msg.getFrom();
                String from = "";
                for(int j=0;j<froms.length;j++){
                    from += getAdds(decodeText(froms[j].toString()))+";";
                }
                
                Address[] ccs = msg.getRecipients(RecipientType.CC);
                String cc = "";
                for(int j=0;ccs!=null&&j<ccs.length;j++){
                    cc += getAdds(decodeText(ccs[j].toString()))+";";
                }
                
                Address[] bccs = msg.getRecipients(RecipientType.BCC);
                String bcc = "";
                for(int j=0;bccs!=null&&j<bccs.length;j++){
                    bcc += getAdds(decodeText(bccs[j].toString()))+";";
                }
                
                String content = "";
                String atth = "";
                if(msg.isMimeType("multipart/*")){
                  Multipart multipart = (Multipart)msg.getContent();
                  int bodyCounts = multipart.getCount();
                  for(int j = 0; j < bodyCounts; j++) {
                      BodyPart bodypart = multipart.getBodyPart(j);
                      if(bodypart.getFileName() != null){
                          String filename = bodypart.getFileName();
                          if(filename.startsWith("=?")){
                              filename = MimeUtility.decodeText(filename);
                          }
                          String path = SaveFile(bodypart.getInputStream(), filename);
                          atth+=path+";";
                      }
                      if(bodypart.isMimeType("text/html")){
                          content = bodypart.getContent().toString();
                      }
                      if(bodypart.isMimeType("text/plain")){
                          content = bodypart.getContent().toString();
                      }
                  }
                }else{
                  content = msg.getContent().toString();
                }
                
                int iscc = 0;
                
                if(cc.contains(username)){
                    iscc = 1;
                }
                
                int isbcc = 0;
                
                if(bcc.contains(username)){
                    isbcc = 1;
                }
                
                int has = 0;
                
                if(!atth.equals("")){
                    has = 1;
                }
                
　　　　　　　　　 int isread = 0;
                Flag[] flags = msg.getFlags().getSystemFlags();
                for(int j=0;j<flags.length;j++){
                    if(flags[j] == Flag.SEEN){
                        isread = 1;
                    }
                }

                Utility.SaveUnread(username, list.get(i), msg.getSentDate(), from, msg.getSubject(), content, cc, bcc, atth,iscc,isbcc,has,to,isread);
            }
            num=1;
        }catch(Exception e){
            e.printStackTrace();
            num=-1;
        }finally{
            return num;
        }        
    }
    
    public String SaveFile(InputStream stream,String filename){
        String path = "";
        try{ 
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
            String d = sdf.format(date);
            File file = new File("D:\server\Test\soaTest\files\"+d);
            if(!file.exists()){
                file.mkdirs();
            }
            FileOutputStream out = new FileOutputStream("D:\server\Test\soaTest\files\"+d+"\"+filename);
            int data;  
            while((data = stream.read()) != -1) {  
                out.write(data);  
            }  
            stream.close();  
            out.close();
            path = "D:\server\Test\soaTest\files\"+d+"\"+filename;
        }catch(Exception ex){
            ex.printStackTrace();
        }finally{
            return path;
        }
    }

 这里要注意，当你先使用一个需要SSL的邮箱接受之后，再使用一个不需要SSL的邮箱接受就会报错，错误提示你无法获取SSL信息。

这时，你需要这样修改

Properties props = System.getProperties();
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.store.protocol", "imap"); 
        props.setProperty("mail.imap.host", server); 
        props.setProperty("mail.imap.port", port);
        
        if(ssl){
            Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
            props.setProperty("mail.imap.socketFactory.class", SSL_FACTORY);
            // 这三句从if外面移进来
            props.setProperty("mail.imap.socketFactory.port", port);         
            props.setProperty("mail.imap.auth.login.disable", "true");
            props.setProperty("mail.imap.auth.plain.disable", "true");
        }

 有的时候会收不到邮件正文，因为有多层的Mult。

public String takeMult(Object par,int i,String username) throws Exception{
        String content = "";
        Multipart multipart = (Multipart)par;
        int bodyCounts = multipart.getCount();
        for(int j = 0; j < bodyCounts; j++) {
            BodyPart bodypart = multipart.getBodyPart(j);
            if(bodypart.getFileName() != null){
                String filename = bodypart.getFileName();
                if(filename.startsWith("=?")){
                    filename = MimeUtility.decodeText(filename);
                }
                if(Utility.IsSaved(i,username)==0){
                    String path = SaveFile(bodypart.getInputStream(), filename);
                    //atth+=path+";";
                }
            }
            if(bodypart.isMimeType("text/html")){
                content = bodypart.getContent().toString();
            }
            if(bodypart.isMimeType("text/plain")){
                content = bodypart.getContent().toString();
            }
            if(bodypart.isMimeType("message/rfc822")){
                content = bodypart.getContent().toString();
            }
            if(bodypart.isMimeType("multipart/*")){
                content = this.takeMult(bodypart.getContent(), i, username);
            }
        }
        return content; 
    }

if(bodypart.isMimeType("text/html")){
                              content = bodypart.getContent().toString();
                          }
                          if(bodypart.isMimeType("text/plain")){
                              content = bodypart.getContent().toString();
                          }
                          if(bodypart.isMimeType("message/rfc822")){
                              content = bodypart.getContent().toString();
                          }
                          if(bodypart.isMimeType("multipart/*")){
                              content = this.takeMult(bodypart.getContent(), i, username);
                          }