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1，邮箱协议设置
1，邮箱的读取需要先配置邮箱协议，主要有两种，第一个是pop3协议，第二个是imap协议，两者之间的区别在于imap是可以区分邮件是否已读取，而pop可以通过SearchTerm查询条件过滤邮件，关于两者的配置QQ邮箱可以直接点下方QQ官方链接设置，
https://service.mail.qq/cgi-bin/help?subtype=1&&id=28&&no=1001256
2，腾讯企业邮箱到不需要配置，因为他默认是已经开启了pop3、imap协议的，可以直接通过账号以及密码登录连接的，但是你也可以配置专用密码进行连接，方法如下图
1，开启前
2，开启后
2，java代码实现
1，两者之前的代码实际上都差不多，区别在于邮箱服务器的配置
imap
1，QQ邮箱服务器：imap.qq.com
2，腾讯企业邮箱服务器：imap.exmail.qq.com
pop
1,QQ邮箱服务器：pop.qq.com
2,腾讯企业邮箱服务器：pop.exmail.qq.com
//涉及pom jar
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
package com.example.demo.utils;
import org.apache.commons.lang3.StringUtils;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
/**
* @author:Deng
* @date: 2021-04-14 17:30
* @remark: 腾讯邮件读取
*/
public class EmailUtils {
public static void readEmail() {
Properties props = new Properties();
props.put("mail.imap.host", "imap.exmail.qq");//QQ邮箱为：imap.qq
props.put("mail.imap.auth", "true");
props.setProperty("mail.store.protocol", "imap");
props.put("mail.imap.starttls.enable", "true");
Session session = Session.getInstance(props);
try {
Store store = session.getStore();
//企业邮箱如果开启了安全登录，密码需要使用专用密码，没有开启使用账号密码即可
store.connect("imap.exmail.qq", "xxx@xx", "xxxxx");
//store.connect("imap.qq", "xxx@xx", "授权码");//QQ邮箱需要设置授权码
Folder folder = store.getFolder("Inbox");
//邮箱打开方式
folder.open(Folder.READ_WRITE);
//收取未读邮件
Message[] messages = folder.getMessages(folder.getMessageCount() - folder.getUnreadMessageCount() + 1, folder.getMessageCount());
System.out.println("邮件总数: " + folder.getMessageCount());
//解析的邮件的方法，就粘贴了网上的了，有需要的直接点击参考文档的链接
parseFileMessage(messages);
folder.setFlags(messages, new Flags(Flags.Flag.SEEN), true);
}catch (Exception e){
System.out.println("异常： " + e);
}
}
public static void readEmailPop() throws Exception {
Properties props = new Properties();
props.put("mail.pop3.host", "pop.exmail.qq");
props.put("mail.pop3.auth", "true");
props.setProperty("mail.store.protocol", "pop3");
props.put("mail.pop3.starttls.enable", "true");
Session session = Session.getInstance(props);
Store store = session.getStore("pop3");
store.connect("pop.exmail.qq", "xxx@xxx", "xxxx");
Folder folder = store.getFolder("Inbox");
//邮箱打开方式
folder.open(Folder.READ_WRITE);
//昨天零点时间
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
Date mondayDate = cal.getTime();
//昨天零点到当前时间的邮件
SearchTerm comparisonTermGe = new SentDateTerm(ComparisonTerm.GE, mondayDate);
SearchTerm comparisonTermLe = new SentDateTerm(ComparisonTerm.LE, new Date());
SearchTerm comparisonAndTerm = new AndTerm(comparisonTermGe, comparisonTermLe);
//条件查询只能通过pop协议的方式才生效
Message[] messages = folder.search(comparisonAndTerm);
// Message[] messages = folder.getMessages();
System.out.println("读取的邮件总数: " + messages.length);
parseFileMessage(messages);
// folder.setFlags(messages, new Flags(Flags.Flag.SEEN), true);
System.out.println("邮件解析任务执行完毕");
}
public static void parseFileMessage(Message... messages) throws Exception {
if (messages == null || messages.length < 1){
System.out.println("没有可读取邮件");
return;
}
// 解析读取到的邮件
for (Message message : messages) {
MimeMessage msg = (MimeMessage) message;
System.out.println("------------------解析第" + msg.getMessageNumber() + "封邮件-------------------- ");
System.out.println("主题: " + MimeUtility.decodeText(msg.getSubject()));
System.out.println("发件人: " + getFrom(msg));
System.out.println("收件人：" + getReceiveAddress(msg, null));
System.out.println("发送时间：" + getSentDate(msg, null));
System.out.println("是否已读：" + isSeen(msg));
System.out.println("邮件优先级：" + getPriority(msg));
System.out.println("是否需要回执：" + isReplySign(msg));
System.out.println("邮件大小：" + msg.getSize() * 1024 + "kb");
StringBuffer content = new StringBuffer(30);
getMailTextContent(msg, content);
System.out.println("邮件正文：" + (content.length() > 100 ? content.substring(0,100) + "..." : content));
System.out.println();
boolean isContainerAttachment = isContainAttachment(msg);
System.out.println("是否包含附件：" + isContainerAttachment);
if (isContainerAttachment) {
saveAttachment(msg, "D:\\data\\emailFile\\", msg.getFileName()); //保存附件
}
System.out.println("------------------第" + msg.getMessageNumber() + "封邮件解析结束-------------------- ");
}
}
/**
* 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;
}
/**
* 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);
}
/**
* 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;
}
/**
* 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.contains("1") || headerPriority.contains("High"))
priority = "紧急";
else if (headerPriority.contains("5") || headerPriority.contains("Low"))
priority = "低";
else
priority = "普通";
}
return priority;
}
/**
* 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 {
StringBuilder receiveAddress = new StringBuilder();
Address[] addresss;
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();
}
/**
* 判断邮件中是否包含附件
*
* @return 存在附件返回true，不存在返回false
*/
public static boolean isContainAttachment(Part part) throws Exception {
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.contains("application")) {
flag = true;
}
if (contentType.contains("name")) {
flag = true;
}
}
if (flag) break;
}
} else if (part.isMimeType("message/rfc822")) {
flag = isContainAttachment((Part) part.getContent());
}
return flag;
}
/**
* 保存文件
*
* @param destDir 文件目录
* @param fileName 文件名
* @throws Exception 异常
*/
public static void saveAttachment(Part part, String destDir, String fileName) throws Exception {
if (part.isMimeType("multipart/*")) {
//复杂体邮件
Multipart multipart = (Multipart) part.getContent();
//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);
//迭代处理邮件体，直到附件为止
String disp = bodyPart.getDisposition();
String decodeName = decodeText(bodyPart.getFileName());
decodeName = StringUtils.isEmpty(decodeName) ? fileName : decodeName;
if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) {
saveFile(bodyPart.getInputStream(), destDir, decodeName);
} else if (bodyPart.isMimeType("multipart/*")) {
saveAttachment(bodyPart, destDir, fileName);
} else {
String contentType = bodyPart.getContentType();
if (contentType.contains("name") || contentType.contains("application")) {
saveFile(bodyPart.getInputStream(), destDir, decodeName);
}
}
}
} else if (part.isMimeType("message/rfc822")) {
saveAttachment((Part) part.getContent(), destDir, fileName);
}
}
/**
* 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);
}
}
}
/**
* 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
*/
private static void saveFile(InputStream is, String destDir, String fileName)
throws Exception {
createEmptyDirectory(destDir);
BufferedInputStream bis = new BufferedInputStream(is);
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(destDir + fileName)));
int len;
while ((len = bis.read()) != -1) {
bos.write(len);
bos.flush();
}
bos.close();
bis.close();
}
/**
* 创建一个空目录
*/
public static void createEmptyDirectory(String directoryPath) {
File file = new File(directoryPath);
if (!file.exists()) {
file.mkdirs();
}
}
/**
* 文本解码
*/
public static String decodeText(String encodeText) throws Exception {
if (encodeText == null || "".equals(encodeText)) {
return "";
} else {
return MimeUtility.decodeText(encodeText);
}
}
}
3，测试结果
imap测试结果：
pop测试结果
没限制查询条件结果
限制条件查询结果
4，存在问题
存在一个问题，就是在邮箱中已经设置只接收近30天的邮件，但是在imap方式中并没有生效，而pop方式是生效了，为什么imap的方式不生效呢？待解决
5，参考文档
[https://blog.csdn/qq_39006919/article/details/109115343]
https://blog.csdn/hj7jay/article/details/84062650
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