Java实现QQ邮箱发送给网易邮箱，发送邮件+附件

实现功能：

Java实现 QQ邮箱给网易邮箱发送邮件
获取邮件信息并下载邮件的附件

前置功能

案例以QQ邮箱为例说明：

首先登录QQ邮箱将SMTP服务开启，会得到一个授权码。
创建一个Springboot项目【mail-demo】
引入依赖

<dependencies><!-- mail邮件发送--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-mail</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency>
</dependencies>

工具类

package com.siro.mp.constant;/*** @author starsea* @date 2023-02-09 14:56*/
public class MailConstant {// 发件人qq邮箱地址public static final String qq_from = "xxxx";// 发件人qq邮箱密钥public static final String qq_from_password = "xxxx";// 发件人网易邮箱地址public static final String wy_from = "xxxx";// 发件人网易邮箱密钥public static final String wy_from_password = "xxxx";// 收件人的qq邮箱地址public static final String qq_to = "xxxx";// 收件人的网易邮箱地址public static final String wy_to = "xxxx";// 发件人邮箱的 SMTP 服务器地址public static String smtphost_wy = "smtp.163.com";// 发件人邮箱的 SMTP 服务器地址public static String smtphost_qq = "smtp.qq.com";// 邮箱的协议public static String protocol_smtp = "smtp";// 邮箱的协议public static final String proteocol_pop3 = "pop3";//端口号public static final String port = "110";//服务器地址public static final String servicePath = "pop.163.com";
}

实现代码如下

1. 发送邮件

package com.siro.mp.utils;import com.siro.mp.constant.MailConstant;
import lombok.extern.slf4j.Slf4j;import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Date;
import java.util.Properties;/*** 发送邮件* qq邮箱 -> 网易邮箱** @author starsea* @date 2023-02-10 13:52*/
@Slf4j
public class SendMailUtils {/*** 发送邮件** @param from          发件人* @param fromPwd       发件人密钥* @param to            收件人* @param subject       邮件主题* @param content       邮件内容* @param isIncludeMail 是否包含邮件* @param fileList      附件地址列表*/public static void sendSimpleMail(String from, String fromPwd, String to, String subject, String content, boolean isIncludeMail, String[] fileList) {log.info("Start .....");// 1. 创建参数配置, 用于连接邮件服务器的参数配置Properties props = new Properties();// 使用的协议（JavaMail规范要求）props.setProperty("mail.transport.protocol", MailConstant.protocol_smtp);// 发件人的邮箱的 SMTP 服务器地址props.setProperty("mail.smtp.host", MailConstant.smtphost_qq);// 需要请求认证props.setProperty("mail.smtp.auth", "true");// 端口号props.setProperty("mail.smtp.port", "465");// qq邮箱必须设置这一项，ssl加密选项
//        props.setProperty("mail.smtp.ssl.enable", "true");// 创建Session对象,session对象表示整个邮件的环境信息Session session = Session.getInstance(props);// 设置输出调试信息session.setDebug(true);try {// Message的实例对象表示一封电子邮件MimeMessage message = new MimeMessage(session);// 设置发件人的地址message.setFrom(new InternetAddress(from));// 设置收件人message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));// 设置时间message.setSentDate(new Date());// 设置主题message.setSubject(subject);// 设置邮件的文本内容BodyPart bp = new MimeBodyPart();bp.setContent(content, "text/html;charset=utf-8");// 创建多重消息Multipart multipart = new MimeMultipart();multipart.addBodyPart(bp);if (isIncludeMail) {if (fileList != null && fileList.length > 0) {for (int i = 0; i < fileList.length; i++) {// 设置附件bp = new MimeBodyPart();DataSource source = new FileDataSource(fileList[i]);DataHandler dh = new DataHandler(source);bp.setDataHandler(dh);bp.setFileName(MimeUtility.encodeText(source.getName(),"UTF-8", "B"));multipart.addBodyPart(bp);}}}message.setContent(multipart);message.saveChanges();// 从session的环境中获取发送邮件的对象Transport transport = session.getTransport();// 连接邮件服务器transport.connect(MailConstant.smtphost_qq, 25, from, fromPwd);// 设置收件人地址,并发送消息transport.sendMessage(message, new Address[]{new InternetAddress(to)});transport.close();log.info("End .....");} catch (Exception e) {log.error("发送邮件失败：{}", e);}}
}

测试

/**
* 发送邮件（工具类）*/
@Test
public void sendMail() throws Exception {String subject = "测试工具类包含邮件";String content = "这是包含邮件的正文.....";String[] fileList = new String[2];fileList[0] = "C:\\Users\\GH\\Desktop\\狗子.docx";fileList[1] = "C:\\Users\\GH\\Desktop\\测试流程.docx";SendMailUtils.sendSimpleMail(MailConstant.qq_from, MailConstant.qq_from_password,MailConstant.wy_to, subject, content, true, fileList);
}

2. 获取邮件信息并下载对应附件

package com.siro.mp.utils;import com.siro.mp.constant.MailConstant;
import lombok.extern.slf4j.Slf4j;import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import javax.mail.search.SearchTerm;
import javax.mail.search.SubjectTerm;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;/*** 获取邮件信息并下载对应附件** @author starsea* @date 2023-02-10 11:44*/
@Slf4j
public class ReceiveEmailUtils {/*** 获取邮箱信息** @param emailAddress 需要解析的邮箱地址* @param password    邮箱的授权密码  不是登录密码* @param projectName 邮箱中邮件标题* @throws Exception*/public static void receive(String emailAddress, String password, String projectName) throws Exception {// 准备连接服务器的会话信息Properties props = new Properties();props.setProperty("mail.store.protocol", MailConstant.proteocol_pop3);props.setProperty("mail.pop3.port", MailConstant.port);props.setProperty("mail.pop3.host", MailConstant.servicePath);// 创建Session实例对象Session session = Session.getInstance(props);Store store = session.getStore(MailConstant.proteocol_pop3);store.connect(emailAddress, password); //163邮箱程序登录属于第三方登录所以这里的密码是163给的授权密码而并非普通的登录密码// 获得收件箱Folder folder = store.getFolder("INBOX");/* Folder.READ_ONLY：只读权限* Folder.READ_WRITE：可读可写（可以修改邮件的状态）*/folder.open(Folder.READ_WRITE); //打开收件箱//        // 由于POP3协议无法获知邮件的状态,所以getUnreadMessageCount得到的是收件箱的邮件总数
//        System.out.println("未读邮件数: " + folder.getUnreadMessageCount());
//
//        // 由于POP3协议无法获知邮件的状态,所以下面得到的结果始终都是为0
//        System.out.println("删除邮件数: " + folder.getDeletedMessageCount());
//        System.out.println("新邮件: " + folder.getNewMessageCount());// 获得收件箱中的邮件总数log.warn("邮件总数: {}", folder.getMessageCount());// 得到收件箱中的所有邮件,并解析
//        Message[] messages = folder.getMessages();//筛选邮件
//        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd 01:00:00");
//        SearchTerm st=new AndTerm(new SubjectTerm("UpdateFromIESToCargo"),
//                new SentDateTerm(6,sf.parse(sf.format(new Date())))  );//6 代表大于等于这时间之后SearchTerm st = new SubjectTerm(projectName);Message[] messages = folder.search(st);//解析邮件parseMessage(messages);//得到收件箱中的所有邮件并且删除邮件
//        deleteMessage(messages);//释放资源folder.close(true);store.close();}/*** 解析邮件** @param messages 要解析的邮件列表*/public static void parseMessage(Message... messages) throws MessagingException, IOException {if (messages == null || messages.length < 1) {throw new MessagingException("未找到要解析的邮件!");}// 解析所有邮件for (int i = 0, count = messages.length; i < count; i++) {MimeMessage msg = (MimeMessage) messages[i];log.info("------------------解析第" + msg.getMessageNumber() + "封邮件-------------------- ");log.warn("主题: {}", getSubject(msg));log.warn("发件人: {}", getFrom(msg));log.warn("收件人：{}", getReceiveAddress(msg, null));log.warn("发送时间：{}", getSentDate(msg, null));log.warn("是否已读：{}", isSeen(msg));log.warn("邮件优先级：{}", getPriority(msg));log.warn("是否需要回执：{}", isReplySign(msg));log.warn("邮件大小：{}", msg.getSize() * 1024 + "kb");boolean isContainerAttachment = isContainAttachment(msg);log.warn("是否包含附件：{}", isContainerAttachment);if (isContainerAttachment) {saveAttachment(msg, "D:\\" + msg.getSubject() + "_" + i + "_"); //保存附件}StringBuffer content = new StringBuffer(30);//解析邮件正文getMailTextContent(msg, content);log.warn("邮件正文：{}", content);log.info("------------------第" + msg.getMessageNumber() + "封邮件解析结束-------------------- ");System.out.println();}}/*** 获得邮件主题** @param msg 邮件内容* @return 解码后的邮件主题*/public static String getSubject(MimeMessage msg) throws UnsupportedEncodingException, MessagingException {return MimeUtility.decodeText(msg.getSubject());}/*** 获得邮件发件人** @param msg 邮件内容* @return 姓名 <Email地址>* @throws MessagingException* @throws UnsupportedEncodingException*/public static String getFrom(MimeMessage msg) throws MessagingException, UnsupportedEncodingException {String from = "";Address[] froms = msg.getFrom();if (froms.length < 1) {throw new MessagingException("没有发件人!");}InternetAddress address = (InternetAddress) froms[0];String person = address.getPersonal();if (person != null) {person = MimeUtility.decodeText(person) + " ";} else {person = "";}from = person + "<" + address.getAddress() + ">";return from;}/*** 根据收件人类型，获取邮件收件人、抄送和密送地址。如果收件人类型为空，则获得所有的收件人* <p>Message.RecipientType.TO  收件人</p>* <p>Message.RecipientType.CC  抄送</p>* <p>Message.RecipientType.BCC 密送</p>** @param msg  邮件内容* @param type 收件人类型* @return 收件人1 <邮件地址1>, 收件人2 <邮件地址2>, ...* @throws MessagingException*/public static String getReceiveAddress(MimeMessage msg, Message.RecipientType type) throws MessagingException {StringBuffer receiveAddress = new StringBuffer();Address[] addresss = null;if (type == null) {addresss = msg.getAllRecipients();} else {addresss = msg.getRecipients(type);}if (addresss == null || addresss.length < 1) {throw new MessagingException("没有收件人!");}for (Address address : addresss) {InternetAddress internetAddress = (InternetAddress) address;receiveAddress.append(internetAddress.toUnicodeString()).append(",");}receiveAddress.deleteCharAt(receiveAddress.length() - 1); //删除最后一个逗号return receiveAddress.toString();}/*** 获得邮件发送时间** @param msg 邮件内容* @return yyyy年mm月dd日 星期X HH:mm* @throws MessagingException*/public static String getSentDate(MimeMessage msg, String pattern) throws MessagingException {Date receivedDate = msg.getSentDate();if (receivedDate == null) {return "";}if (pattern == null || "".equals(pattern)) {pattern = "yyyy年MM月dd日 E HH:mm ";}return new SimpleDateFormat(pattern).format(receivedDate);}/*** 判断邮件是否已读** @param msg 邮件内容* @return 如果邮件已读返回true, 否则返回false* @throws MessagingException*/public static boolean isSeen(MimeMessage msg) throws MessagingException {return msg.getFlags().contains(Flags.Flag.SEEN);}/*** 获得邮件的优先级** @param msg 邮件内容* @return 1(High):紧急  3:普通(Normal)  5:低(Low)* @throws MessagingException*/public static String getPriority(MimeMessage msg) throws MessagingException {String priority = "普通";String[] headers = msg.getHeader("X-Priority");if (headers != null) {String headerPriority = headers[0];if (headerPriority.indexOf("1") != -1 || headerPriority.indexOf("High") != -1) {priority = "紧急";} else if (headerPriority.indexOf("5") != -1 || headerPriority.indexOf("Low") != -1) {priority = "低";} else {priority = "普通";}}return priority;}/*** 判断邮件是否需要阅读回执** @param msg 邮件内容* @return 需要回执返回true, 否则返回false* @throws MessagingException*/public static boolean isReplySign(MimeMessage msg) throws MessagingException {boolean replySign = false;String[] headers = msg.getHeader("Disposition-Notification-To");if (headers != null) {replySign = true;}return replySign;}/*** 判断邮件中是否包含附件** @param part 邮件内容* @return 邮件中存在附件返回true，不存在返回false* @throws MessagingException* @throws IOException*/public static boolean isContainAttachment(Part part) throws MessagingException, IOException {boolean flag = false;if (part.isMimeType("multipart/*")) {MimeMultipart multipart = (MimeMultipart) part.getContent();int partCount = multipart.getCount();for (int i = 0; i < partCount; i++) {BodyPart bodyPart = multipart.getBodyPart(i);String disp = bodyPart.getDisposition();if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) {flag = true;} else if (bodyPart.isMimeType("multipart/*")) {flag = isContainAttachment(bodyPart);} else {String contentType = bodyPart.getContentType();if (contentType.indexOf("application") != -1) {flag = true;}if (contentType.indexOf("name") != -1) {flag = true;}}if (flag) {break;}}} else if (part.isMimeType("message/rfc822")) {flag = isContainAttachment((Part) part.getContent());}return flag;}/*** 文本解码** @param encodeText 解码MimeUtility.encodeText(String text)方法编码后的文本* @return 解码后的文本* @throws UnsupportedEncodingException*/public static String decodeText(String encodeText) throws UnsupportedEncodingException {if (encodeText == null || "".equals(encodeText)) {return "";} else {return MimeUtility.decodeText(encodeText);}}/*** 保存附件** @param part    邮件中多个组合体中的其中一个组合体* @param destDir 附件保存目录* @throws UnsupportedEncodingException* @throws MessagingException* @throws FileNotFoundException* @throws IOException*/public static void saveAttachment(Part part, String destDir) throws MessagingException, IOException {if (part.isMimeType("multipart/*")) {Multipart multipart = (Multipart) part.getContent();    //复杂体邮件//复杂体邮件包含多个邮件体int partCount = multipart.getCount();for (int i = 0; i < partCount; i++) {//获得复杂体邮件中其中一个邮件体BodyPart bodyPart = multipart.getBodyPart(i);//某一个邮件体也有可能是由多个邮件体组成的复杂体String disp = bodyPart.getDisposition();if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) {InputStream is = bodyPart.getInputStream();saveFile(is, destDir, decodeText(bodyPart.getFileName()));} else if (bodyPart.isMimeType("multipart/*")) {saveAttachment(bodyPart, destDir);} else {String contentType = bodyPart.getContentType();if (contentType.indexOf("name") != -1 || contentType.indexOf("application") != -1) {saveFile(bodyPart.getInputStream(), destDir, decodeText(bodyPart.getFileName()));}}}} else if (part.isMimeType("message/rfc822")) {saveAttachment((Part) part.getContent(), destDir);}}/*** 读取输入流中的数据保存至指定目录** @param is       输入流* @param fileName 文件名* @param destDir  文件存储目录* @throws FileNotFoundException* @throws IOException*/private static void saveFile(InputStream is, String destDir, String fileName) throws FileNotFoundException, IOException {BufferedInputStream bis = new BufferedInputStream(is);BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(destDir + fileName)));int len = -1;while ((len = bis.read()) != -1) {bos.write(len);bos.flush();}bos.close();bis.close();}/*** 获得邮件文本内容** @param part    邮件体* @param content 存储邮件文本内容的字符串* @throws MessagingException* @throws IOException*/public static void getMailTextContent(Part part, StringBuffer content) throws MessagingException, IOException {//如果是文本类型的附件，通过getContent方法可以取到文本内容，但这不是我们需要的结果，所以在这里要做判断boolean isContainTextAttach = part.getContentType().indexOf("name") > 0;if (part.isMimeType("text/*") && !isContainTextAttach) {content.append(part.getContent().toString());} else if (part.isMimeType("message/rfc822")) {getMailTextContent((Part) part.getContent(), content);} else if (part.isMimeType("multipart/*")) {Multipart multipart = (Multipart) part.getContent();int partCount = multipart.getCount();for (int i = 0; i < partCount; i++) {BodyPart bodyPart = multipart.getBodyPart(i);getMailTextContent(bodyPart, content);}}}/*** 删除邮件** @param messages 要删除邮件列表*/public static void deleteMessage(Message... messages) throws MessagingException, IOException {if (messages == null || messages.length < 1) {throw new MessagingException("未找到要解析的邮件!");}// 解析所有邮件for (int i = 0, count = messages.length; i < count; i++) {/*** 邮件删除*/Message message = messages[i];String subject = message.getSubject();// set the DELETE flag to truemessage.setFlag(Flags.Flag.DELETED, true);System.out.println("Marked DELETE for message: " + subject);}}
}

测试

/*** 解析邮件并下载附件*/
@Test
public void sendReceiveEmail() throws Exception {ReceiveEmailUtils.receive(MailConstant.wy_from, MailConstant.wy_from_password, "测试工具类发送简单邮件");
}

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前置功能

1. 发送邮件

2. 获取邮件信息并下载对应附件

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