Java邮件发送（实名发送和匿名发送）

共包含三个类：

MailAuthenticator、MailMessage、MailUtil

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;public class MailAuthenticator extends Authenticator {/*** Represents the username of sending SMTP server.* <p>For example: If you use smtp.163.com as your smtp server, then the related* username should be: <br>'<b>testname@163.com</b>', or just '<b>testname</b>' is OK.*/private String username = null;/*** Represents the password of sending SMTP sever.* More explicitly, the password is the password of username.*/private String password = null;public MailAuthenticator(String user, String pass) {username = user;password = pass;} protected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(username, password);}
}

package com.plugin.pojo;public class MailMessage {private String subject;private String from;private String[] tos;private String[] ccs;private String[] bccs;private String content;private String[] fileNames;/*** * * No parameter constructor.* * */public MailMessage() {}/*** * * Construct a MailMessage object.* * */public MailMessage(String subject, String from, String[] tos,String[] ccs, String[] bccs, String content, String[] fileNames) {this.subject = subject;this.from = from;this.tos = tos;this.ccs = ccs;this.bccs = bccs;this.content = content;this.fileNames = fileNames;}/*** * * Construct a simple MailMessage object.* * */public MailMessage(String subject, String from, String to, String content) {this.subject = subject;this.from = from;this.tos = new String[] { to };this.content = content;}public String getSubject() {return subject;}public void setSubject(String subject) {this.subject = subject;}public String getFrom() {return from;}public void setFrom(String from) {this.from = from;}public String[] getTos() {return tos;}public void setTos(String[] tos) {this.tos = tos;}public String[] getCcs() {return ccs;}public void setCcs(String[] ccs) {this.ccs = ccs;}public String[] getBccs() {return bccs;}public void setBccs(String[] bccs) {this.bccs = bccs;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public String[] getFileNames() {return fileNames;}public void setFileNames(String[] fileNames) {this.fileNames = fileNames;}}

package com.plugin.util;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Hashtable;
import java.util.List;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import org.apache.log4j.Logger;
import com.common.MailAuthenticator;
import com.plugin.pojo.MailMessage;public class MailUtil {private static final Logger LOGGER = Logger.getLogger(MailUtil.class);private static String SMTPServer;private static String SMTPUsername;private static String SMTPPassword;private static String POP3Server;private static String POP3Username;private static String POP3Password;
//    static {
//        loadConfigProperties();
//    }//    public static void main(String[] args) {
//
//        //发送邮件
//        MailMessage mail = new MailMessage(
//                "test-subject",
//                "xxxx@163.com",
//                "yyyy@126.com",
//                "This is mail content");
//        //set attachments
//        String[] attachments = new String[]{
//                "C:\\AndroidManifest.xml",
//                "C:\\ic_launcher-web.png",
//                "C:\\光良 - 童话.mp3",
//                "C:\\文档测试.doc",
//                "C:\\中文文件名测试.txt"};
//        mail.setFileNames(attachments);
//        sendEmail(mail);
//        //接收邮件
//        receiveEmail(POP3Server, POP3Username, POP3Password);
//        //发送匿名邮件
//        MailMessage anonymousMail = new MailMessage("subject",
//            "a@a.a", "zzzz@qq.com", "content");
//        anonymousMail.setFileNames(attachments);
//        //sendAnonymousEmail(anonymousMail);
//    }/*** Load configuration properties to initialize attributes.*/private static void loadConfigProperties() {File f = new File("");//this path would point to AbcCommonString absolutePath = f.getAbsolutePath();String propertiesPath = "";String OSName = System.getProperty("os.name");if(OSName.contains("Windows")) {propertiesPath = absolutePath + "\\..\\src\\main\\resources\\project.properties";} else if(OSName.contains("unix")) {propertiesPath = absolutePath + "/../src/main/resources/project.properties";}f = new File(propertiesPath);if(!f.exists()) {throw new RuntimeException("Porperties file not found at: " + f.getAbsolutePath());}Properties props = new Properties();try {props.load(new FileInputStream(f));SMTPServer = props.getProperty("AbcCommon.mail.SMTPServer");SMTPUsername = props.getProperty("AbcCommon.mail.SMTPUsername");SMTPPassword = props.getProperty("AbcCommon.mail.SMTPPassword");POP3Server = props.getProperty("AbcCommon.mail.POP3Server");POP3Username = props.getProperty("AbcCommon.mail.POP3Username");POP3Password = props.getProperty("AbcCommon.mail.POP3Password");} catch (FileNotFoundException e) {LOGGER.error("File not found at " + f.getAbsolutePath(), e);} catch (IOException e) {LOGGER.error("Error reading config file " + f.getName(), e);}}/*** Send email. Note that the fileNames of MailMessage are the absolute path of file.* @param mail The MailMessage object which contains at least all the required *        attributes to be sent.*/public static void sendEmail(MailMessage mail) {sendEmail(null, mail, false);}/*** Send anonymous email. Note that although we could give any address as from address,* (for example: <b>'a@a.a' is valid</b>), the from of MailMessage should always be the * correct format of email address(for example the <b>'aaaa' is invalid</b>). Otherwise * an exception would be thrown say that username is invalid.* @param mail The MailMessage object which contains at least all the required *        attributes to be sent.*/public  void sendAnonymousEmail(MailMessage mail) {String dns = "dns://";Hashtable<String, String> env = new Hashtable<String, String>();env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.dns.DnsContextFactory");env.put(Context.PROVIDER_URL, dns);String[] tos = mail.getTos();try {DirContext ctx = new InitialDirContext(env);for(String to:tos) {String domain = to.substring(to.indexOf('@') + 1);//Get MX(Mail eXchange) records from DNSAttributes attrs = ctx.getAttributes(domain, new String[] { "MX" });if (attrs == null || attrs.size() <= 0) {throw new java.lang.IllegalStateException("Error: Your DNS server has no Mail eXchange records!");}@SuppressWarnings("rawtypes")NamingEnumeration servers = attrs.getAll();String smtpHost = null;boolean isSend = false;StringBuffer buf = new StringBuffer();//try all the mail exchange server to send the email.while (servers.hasMore()) {Attribute hosts = (Attribute) servers.next();for (int i = 0; i < hosts.size(); ++i) {//sample: 20 mx2.qq.comsmtpHost = (String) hosts.get(i);//parse the string to get smtpHost. sample: mx2.qq.comsmtpHost = smtpHost.substring(smtpHost.lastIndexOf(' ') + 1);try {sendEmail(smtpHost, mail, true);isSend = true;return;} catch (Exception e) {LOGGER.error("", e);buf.append(e.toString()).append("\r\n");continue;}}}if (!isSend) {throw new java.lang.IllegalStateException("Error: Send email error."+ buf.toString());}}} catch (NamingException e) {LOGGER.error("", e);}} /*** Send Email. Use string array to represents attachments file names.* @see #sendEmail(String, String, String[], String[], String[], String, File[])*/private static void sendEmail(String smtpHost, MailMessage mail, boolean isAnonymousEmail) {if(mail == null) {throw new IllegalArgumentException("Param mail can not be null.");}String[] fileNames = mail.getFileNames();//only needs to check the param: fileNames, other params would be checked through//the override method.File[] files = null;if(fileNames != null && fileNames.length > 0) {files = new File[fileNames.length];for(int i = 0; i < files.length; i++) {File file = new File(fileNames[i]);files[i] = file;}}sendEmail(smtpHost, mail.getSubject(), mail.getFrom(), mail.getTos(), mail.getCcs(), mail.getBccs(), mail.getContent(), files, isAnonymousEmail);}/*** Send Email. Note that content and attachments cannot be empty at the same time.* @param smtpHost The SMTPHost. This param is needed when sending an anonymous email.*        When sending normal email, the param is ignored and the default SMTPServer*        configured is used.* @param subject The email subject.* @param from The sender address. This address must be available in SMTPServer.* @param tos The receiver addresses. At least 1 address is valid.* @param ccs The 'copy' receiver. Can be empty.* @param bccs The 'encrypt copy' receiver. Can be empty.* @param content The email content.* @param attachments The file array represent attachments to be send.* @param isAnonymousEmail If this mail is send in anonymous mode. When set to true, the *        param smtpHost is needed and sender's email address from should be in correct*        pattern.*/private static void sendEmail(String smtpHost, String subject, String from, String[] tos, String[] ccs, String[] bccs, String content, File[] attachments, boolean isAnonymousEmail) {//parameter checkif(isAnonymousEmail && smtpHost == null) {throw new IllegalStateException("When sending anonymous email, param smtpHost cannot be null");}if(subject == null || subject.length() == 0) {subject = "Auto-generated subject";}if(from == null) {throw new IllegalArgumentException("Sender's address is required.");}if(tos == null || tos.length == 0) {throw new IllegalArgumentException("At lease 1 receive address is required.");}if(content == null && (attachments == null || attachments.length == 0)) {throw new IllegalArgumentException("Content and attachments cannot be empty at the same time");}if(attachments != null && attachments.length > 0) {List<File> invalidAttachments = new ArrayList<>();for(File attachment:attachments) {if(!attachment.exists() || attachment.isDirectory() || !attachment.canRead()) {invalidAttachments.add(attachment);}}if(invalidAttachments.size() > 0) {String msg = "";for(File attachment:invalidAttachments) {msg += "\n\t" + attachment.getAbsolutePath();}throw new IllegalArgumentException("The following attachments are invalid:" + msg);}}Session session;Properties props = new Properties();props.put("mail.transport.protocol", "smtp");if(isAnonymousEmail) {//only anonymous email needs param smtpHostprops.put("mail.smtp.host", smtpHost);props.put("mail.smtp.auth", "false");session = Session.getInstance(props, null);} else {//normal email does not need param smtpHost and uses the default host SMTPServerprops.put("mail.smtp.host", SMTPServer); props.put("mail.smtp.auth", "true");session = Session.getInstance(props, new MailAuthenticator(SMTPUsername, SMTPPassword));}//create messageMimeMessage msg = new MimeMessage(session);try {//Multipart is used to store many BodyPart objects.Multipart multipart=new MimeMultipart();          BodyPart part = new MimeBodyPart();part.setContent(content,"text/html;charset=gb2312");//add email content part.multipart.addBodyPart(part);           //add attachment parts.if(attachments != null && attachments.length > 0) {for(File attachment: attachments) {String fileName = attachment.getName();DataSource dataSource = new FileDataSource(attachment);DataHandler dataHandler = new DataHandler(dataSource);part = new MimeBodyPart();part.setDataHandler(dataHandler);//solve encoding problem of attachments file name.try {fileName = MimeUtility.encodeText(fileName);} catch (UnsupportedEncodingException e) {LOGGER.error("Cannot convert the encoding of attachments file name.", e);}//set attachments the original file name. if not set, //an auto-generated name would be used.part.setFileName(fileName);multipart.addBodyPart(part);}}msg.setSubject(subject);msg.setSentDate(new Date());//set sendermsg.setFrom(new InternetAddress(from));//set receiver, for(String to: tos) {msg.addRecipient(RecipientType.TO, new InternetAddress(to));}if(ccs != null && ccs.length > 0) {for(String cc: ccs) {msg.addRecipient(RecipientType.CC, new InternetAddress(cc));}}if(bccs != null && bccs.length > 0) {for(String bcc: bccs) {msg.addRecipient(RecipientType.BCC, new InternetAddress(bcc));}}msg.setContent(multipart);//save the changes of email first.msg.saveChanges();//to see what commands are used when sending a email, use session.setDebug(true)//session.setDebug(true);//send emailTransport.send(msg); LOGGER.info("Send email success.");System.out.println("Send html email success.");} catch (NoSuchProviderException e) {LOGGER.error("Email provider config error.", e);} catch (MessagingException e) {LOGGER.error("Send email error.", e);}}/*** Receive Email from POPServer. Use POP3 protocal by default. Thus,* call this method, you need to provide a pop3 mail server address.* @param emailAddress The email account in the POPServer.* @param password The password of email address.*/public static void receiveEmail(String host, String username, String password) {//param check. If param is null, use the default configured value.if(host == null) {host = POP3Server;}if(username == null) {username = POP3Username;}if(password == null) {password = POP3Password;}Properties props = System.getProperties();//MailAuthenticator authenticator = new MailAuthenticator(username, password);try {Session session = Session.getDefaultInstance(props, null);// Store store = session.getStore("imap");Store store = session.getStore("pop3");// Connect POPServerstore.connect(host, username, password);Folder inbox = store.getFolder("INBOX");if (inbox == null) {throw new RuntimeException("No inbox existed.");}// Open the INBOX with READ_ONLY mode and start to read all emails.inbox.open(Folder.READ_ONLY);System.out.println("TOTAL EMAIL:" + inbox.getMessageCount());Message[] messages = inbox.getMessages();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");for (int i = 0; i < messages.length; i++) {Message msg = messages[i];String from = InternetAddress.toString(msg.getFrom());String replyTo = InternetAddress.toString(msg.getReplyTo());String to = InternetAddress.toString(msg.getRecipients(Message.RecipientType.TO));String subject = msg.getSubject();Date sent = msg.getSentDate();Date ress = msg.getReceivedDate();String type = msg.getContentType();System.out.println((i + 1) + ".---------------------------------------------");System.out.println("From:" + mimeDecodeString(from));System.out.println("Reply To:" + mimeDecodeString(replyTo));System.out.println("To:" + mimeDecodeString(to));System.out.println("Subject:" + mimeDecodeString(subject));System.out.println("Content-type:" + type);if (sent != null) {System.out.println("Sent Date:" + sdf.format(sent));}if (ress != null) {System.out.println("Receive Date:" + sdf.format(ress));}//                //Get message headers.
//                @SuppressWarnings("rawtypes")
//                Enumeration headers = msg.getAllHeaders();
//                while (headers.hasMoreElements()) {
//                    Header h = (Header) headers.nextElement();
//                    String name = h.getName();
//                    String val = h.getValue();
//                    System.out.println(name + ": " + val);
//                }//                //get the email content.
//                Object content = msg.getContent();
//                System.out.println(content);
//                //print content
//                Reader reader = new InputStreamReader(
//                        messages[i].getInputStream());
//                int a = 0;
//                while ((a = reader.read()) != -1) {
//                    System.out.print((char) a);
//                }}// close connection. param false represents do not delete messaegs on server.inbox.close(false);store.close();//        } catch(IOException e) {
//            LOGGER.error("IOException caught while printing the email content", e);} catch (MessagingException e) {LOGGER.error("MessagingException caught when use message object", e);}}/*** For receiving an email, the sender, receiver, reply-to and subject may * be messy code. The default encoding of HTTP is ISO8859-1, In this situation, * use MimeUtility.decodeTex() to convert these information to GBK encoding.* @param res The String to be decoded.* @return A decoded String.*/private static String mimeDecodeString(String res) {if(res != null) {String from = res.trim();try {if (from.startsWith("=?GB") || from.startsWith("=?gb")|| from.startsWith("=?UTF") || from.startsWith("=?utf")) {from = MimeUtility.decodeText(from);}} catch (Exception e) {LOGGER.error("Decode string error. Origin string is: " + res, e);}return from;}return null;}
}

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