依赖：
<!-- https://mvnrepository.com/artifact/javax.mail/mail -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.5.0-b01</version>
</dependency>
1.使用SMTP发送邮件
@ 转自：http://blog.csdn.net/smok56888/article/details/50070453
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
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;
public class Email {
private static String defaultSenderName = "";// 默认的发件人用户名，defaultEntity用得到
private static String defaultSenderPass = "";// 默认的发件人密码，defaultEntity用得到
private static String defaultSmtpHost = "";// 默认的邮件服务器地址，defaultEntity用得到
private String smtpHost; // 邮件服务器地址
private String sendUserName; // 发件人的用户名
private String sendUserPass; // 发件人密码
private MimeMessage mimeMsg; // 邮件对象
private Session session;
private Properties props;
private Multipart mp;// 附件添加的组件
private List<FileDataSource> files = new LinkedList<FileDataSource>();// 存放附件文件
private void init() {
if (props == null) {
props = System.getProperties();
}
props.put("mail.smtp.host", smtpHost);
props.put("mail.smtp.auth", "true"); // 需要身份验证
session = Session.getDefaultInstance(props, null);
// 置true可以在控制台（console)上看到发送邮件的过程
session.setDebug(true);
// 用session对象来创建并初始化邮件对象
mimeMsg = new MimeMessage(session);
// 生成附件组件的实例
mp = new MimeMultipart();
}
private Email(String smtpHost, String sendUserName, String sendUserPass, String to, String cc, String mailSubject, String mailBody,
List<String> attachments) {
this.smtpHost = smtpHost;
this.sendUserName = sendUserName;
this.sendUserPass = sendUserPass;
init();
setFrom(sendUserName);
setTo(to);
setCC(cc);
setBody(mailBody);
setSubject(mailSubject);
if (attachments != null) {
for (String attachment : attachments) {
addFileAffix(attachment);
}
}
}
/**
* 邮件实体
*
* @param smtpHost
* 邮件服务器地址
* @param sendUserName
* 发件邮件地址
* @param sendUserPass
* 发件邮箱密码
* @param to
* 收件人，多个邮箱地址以半角逗号分隔
* @param cc
* 抄送，多个邮箱地址以半角逗号分隔
* @param mailSubject
* 邮件主题
* @param mailBody
* 邮件正文
* @param attachmentPath
* 附件路径
* @return
*/
public static Email entity(String smtpHost, String sendUserName, String sendUserPass, String to, String cc, String mailSubject, String mailBody,
List<String> attachments) {
return new Email(smtpHost, sendUserName, sendUserPass, to, cc, mailSubject, mailBody, attachments);
}
/**
* 默认邮件实体，用了默认的发送帐号和邮件服务器
*
* @param to
* 收件人，多个邮箱地址以半角逗号分隔
* @param cc
* 抄送，多个邮箱地址以半角逗号分隔
* @param subject
* 邮件主题
* @param body
* 邮件正文
* @param attachment
* 附件全路径
* @return
*/
public static Email defaultEntity(String to, String cc, String subject, String body, List<String> attachments) {
return new Email(defaultSmtpHost, defaultSenderName, defaultSenderPass, to, cc, subject, body, attachments);
}
/**
* 设置邮件主题
*
* @param mailSubject
* @return
*/
private boolean setSubject(String mailSubject) {
try {
mimeMsg.setSubject(mailSubject);
} catch (Exception e) {
return false;
}
return true;
}
/**
* 设置邮件内容,并设置其为文本格式或HTML文件格式，编码方式为UTF-8
*
* @param mailBody
* @return
*/
private boolean setBody(String mailBody) {
try {
BodyPart bp = new MimeBodyPart();
bp.setContent("<meta http-equiv=Content-Type content=text/html; charset=UTF-8>" + mailBody, "text/html;charset=UTF-8");
// 在组件上添加邮件文本
mp.addBodyPart(bp);
} catch (Exception e) {
System.err.println("设置邮件正文时发生错误！" + e);
return false;
}
return true;
}
/**
* 添加一个附件
*
* @param filename
* 邮件附件的地址，只能是本机地址而不能是网络地址，否则抛出异常
* @return
*/
public boolean addFileAffix(String filename) {
try {
if (filename != null && filename.length() > 0) {
BodyPart bp = new MimeBodyPart();
FileDataSource fileds = new FileDataSource(filename);
bp.setDataHandler(new DataHandler(fileds));
bp.setFileName(MimeUtility.encodeText(fileds.getName(), "utf-8", null)); // 解决附件名称乱码
mp.addBodyPart(bp);// 添加附件
files.add(fileds);
}
} catch (Exception e) {
System.err.println("增加邮件附件：" + filename + "发生错误！" + e);
return false;
}
return true;
}
/**
* 删除所有附件
*
* @return
*/
public boolean delFileAffix() {
try {
FileDataSource fileds = null;
for (Iterator<FileDataSource> it = files.iterator(); it.hasNext();) {
fileds = it.next();
if (fileds != null && fileds.getFile() != null) {
fileds.getFile().delete();
}
}
} catch (Exception e) {
return false;
}
return true;
}
/**
* 设置发件人地址
*
* @param from
* 发件人地址
* @return
*/
private boolean setFrom(String from) {
try {
mimeMsg.setFrom(new InternetAddress(from));
} catch (Exception e) {
return false;
}
return true;
}
/**
* 设置收件人地址
*
* @param to收件人的地址
* @return
*/
private boolean setTo(String to) {
if (to == null)
return false;
try {
mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
} catch (Exception e) {
return false;
}
return true;
}
/**
* 设置抄送
*
* @param cc
* @return
*/
private boolean setCC(String cc) {
if (cc == null) {
return false;
}
try {
mimeMsg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc));
} catch (Exception e) {
return false;
}
return true;
}
/**
* 发送邮件
*
* @return
*/
public boolean send() throws Exception {
mimeMsg.setContent(mp);
mimeMsg.saveChanges();
System.out.println("正在发送邮件....");
Transport transport = session.getTransport("smtp");
// 连接邮件服务器并进行身份验证
transport.connect(smtpHost, sendUserName, sendUserPass);
// 发送邮件
transport.sendMessage(mimeMsg, mimeMsg.getRecipients(Message.RecipientType.TO));
System.out.println("发送邮件成功！");
transport.close();
return true;
}
}
所需依赖:
<span style="white-space:pre"> </span><dependency>
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>
<version>1.5.2</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>smtp</artifactId>
<version>1.5.2</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>mailapi</artifactId>
<version>1.5.2</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
<scope>test</scope>
</dependency>
2.使用POP3接收邮件
import com.google.common.base.Strings;
import com.sun.mail.pop3.POP3SSLStore;
import org.testng.annotations.Test;
import javax.mail.*;
import java.io.*;
import java.util.Date;
import java.util.Properties;
public class EmailInspector {
public static final String EMAIL_SERVER_URL = "pop3.mxhichina.com";
public static final String GMAIL_SERVER_URL = "pop.gmail.com";
public static String email = "";
public static String password = "";
public static void initEmailInspector(String email, String password) {
EmailInspector.email = email;
EmailInspector.password = password;
}
public static void clearInbox() throws Exception {
// connect to my pop3 inbox
Store store;
if(email.contains("@gmail"))
store = gmailWithSSLConnect();
else
store = emailConnect();
Folder inbox = store.getFolder("Inbox");
inbox.open(Folder.READ_WRITE);
// get the list of inbox messages
Message[] messages = inbox.getMessages();
if (messages.length == 0) System.out.println("No messages found.");
for (int i = 0; i < messages.length; i++) {
System.out.println("Message " + (i + 1));
System.out.println("From : " + messages[i].getFrom()[0]);
System.out.println("Subject : " + messages[i].getSubject());
System.out.println("Sent Date : " + messages[i].getSentDate());
System.out.println("Content : " + messages[i].getContent().toString());
writePart(messages[i]);
System.out.println();
messages[i].setFlag(Flags.Flag.DELETED, true);
}
inbox.close(true);
store.close();
}
public static Message getLatestEmail() throws Exception {
Store store;
Message lastestEmail = null;
if(email.contains("@gmail"))
store = gmailWithSSLConnect();
else
store = emailConnect();
Folder inbox = store.getFolder("Inbox");
inbox.open(Folder.READ_WRITE);
// get the list of inbox messages
Message[] messages = inbox.getMessages();
if (messages.length == 0) {
System.out.println("No messages found.");
return null;
}
lastestEmail = messages[messages.length - 1];
return lastestEmail;
}
/**
* This method checks for content-type
* based on which, it processes and
* fetches the content of the message
*/
private static String writePart(Part p) throws Exception {
if (p instanceof Message)
//Call method writeEnvelope
writeEnvelope((Message) p);
System.out.println("----------------------------");
System.out.println("CONTENT-TYPE: " + p.getContentType());
//check if the content is plain text
if (p.isMimeType("text/plain")) {
System.out.println("This is plain text");
System.out.println("---------------------------");
System.out.println((String) p.getContent());
}
//check if the content has attachment
else if (p.isMimeType("multipart/*")) {
System.out.println("This is a Multipart");
System.out.println("---------------------------");
Multipart mp = (Multipart) p.getContent();
int count = mp.getCount();
for (int i = 0; i < count; i++) {
String str = writePart(mp.getBodyPart(i));
if (str != null)
return str;
}
}
//check if the content is a nested message
else if (p.isMimeType("message/rfc822")) {
System.out.println("This is a Nested Message");
System.out.println("---------------------------");
writePart((Part) p.getContent());
}
//check if the content is an inline image
else if (p.isMimeType("image/jpeg")) {
System.out.println("--------> image/jpeg");
}
else if (p.getContentType().contains("image/")) {
System.out.println("content type" + p.getContentType());
File f = new File("image" + new Date().getTime() + ".jpg");
DataOutputStream output = new DataOutputStream(
new BufferedOutputStream(new FileOutputStream(f)));
com.sun.mail.util.BASE64DecoderStream test =
(com.sun.mail.util.BASE64DecoderStream) p
.getContent();
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = test.read(buffer)) != -1) {
output.write(buffer, 0, bytesRead);
}
}
else {
Object o = p.getContent();
if (o instanceof String) {
System.out.println("This is a string");
System.out.println("---------------------------");
System.out.println((String) o);
return (String) o;
}
else if (o instanceof InputStream) {
System.out.println("This is just an input stream");
System.out.println("---------------------------");
InputStream is = (InputStream) o;
is = (InputStream) o;
int c;
while ((c = is.read()) != -1)
System.out.write(c);
}
else {
System.out.println("This is an unknown type");
System.out.println("---------------------------");
System.out.println(o.toString());
}
}
return null;
}
/*
* This method would print FROM,TO and SUBJECT of the message
*/
public static void writeEnvelope(Message m) throws Exception {
System.out.println("This is the message envelope");
System.out.println("---------------------------");
Address[] a;
// FROM
if ((a = m.getFrom()) != null) {
for (int j = 0; j < a.length; j++)
System.out.println("FROM: " + a[j].toString());
}
// TO
if ((a = m.getRecipients(Message.RecipientType.TO)) != null) {
for (int j = 0; j < a.length; j++)
System.out.println("TO: " + a[j].toString());
}
// SUBJECT
if (m.getSubject() != null)
System.out.println("SUBJECT: " + m.getSubject());
}
public static Store gmailWithSSLConnect() throws Exception {
String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
Properties pop3Props = new Properties();
pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false");
pop3Props.setProperty("mail.pop3.port", "995");
pop3Props.setProperty("mail.pop3.socketFactory.port", "995");
URLName url = new URLName("pop3", "pop.gmail.com", 995, "",
email, password);
Session session = Session.getInstance(pop3Props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(email, password);
}
});
Store store = new POP3SSLStore(session, url);
store.connect();
return store;
}
public static Store emailConnect() throws Exception {
Properties properties = System.getProperties();
Session session = Session.getDefaultInstance(properties);
Store store = session.getStore("pop3");
store.connect(EMAIL_SERVER_URL, email, password);
return store;
}
@Test
public void test() throws Exception {
initEmailInspector("rcmeetings.ta@gmail.com","Test!123");
System.out.println(getLatestEmail().getSubject());
}
}
