从来好事天生俭，自古瓜儿苦后甜。这篇文章主要讲述java实现读取163邮箱，qq邮箱的邮件内容相关的知识，希望能为你提供帮助。
通过使用java mail来实现读取163邮箱，qq邮箱的邮件内容。
1.代码实现：
创建springboot项目，引入依赖包

< !--mail-->
< dependency>
< groupId> org.springframework.boot< /groupId>
< artifactId> spring-boot-starter-mail< /artifactId>
< /dependency>

import com.sun.mail.imap.IMAPFolder;
import com.sun.mail.imap.protocol.IMAPProtocol;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.util.ObjectUtils;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import java.io.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class ShowMail

public static String NORM_DATETIME_PATTERN = "yyyy-MM-dd hh:mm:ss";
private MimeMessage mimeMessage;
/**
* 附件下载后的存放目录
*/
private String saveAttachPath = "";
/**
* 存放邮件内容的StringBuffer对象
*/
private StringBuffer bodyText = new StringBuffer();

/**
* 构造函数,初始化一个MimeMessage对象
*
* @param mimeMessage
*/
public ShowMail(MimeMessage mimeMessage)
this.mimeMessage = mimeMessage;


/**
* 获得发件人的地址和姓名
*
* @return
* @throws MessagingException
*/
public String getFrom() throws MessagingException
InternetAddress address[] = (InternetAddress[]) mimeMessage.getFrom();
String from = address[0].getAddress();
if (from == null)
from = "";

String personal = address[0].getPersonal();

if (personal == null)
personal = "";


String fromAddr = null;
if (personal != null || from != null)
fromAddr = personal + "< " + from + "> ";

return fromAddr;


/**
* 获得邮件的收件人，抄送，和密送的地址和姓名，根据所传递的参数的不同
*
* @param type "to"----收件人　"cc"---抄送人地址　"bcc"---密送人地址
* @return
* @throws MessagingException
* @throws UnsupportedEncodingException
*/
public String getMailAddress(String type) throws MessagingException, UnsupportedEncodingException
if (ObjectUtils.isEmpty(type))
return "";


String addType = type.toUpperCase();

if (!addType.equals("TO") & & !addType.equals("CC") & & !addType.equals("BCC"))
return "";

InternetAddress[] address;

if (addType.equals("TO"))
address = (InternetAddress[]) mimeMessage.getRecipients(Message.RecipientType.TO);
else if (addType.equals("CC"))
address = (InternetAddress[]) mimeMessage.getRecipients(Message.RecipientType.CC);
else
address = (InternetAddress[]) mimeMessage.getRecipients(Message.RecipientType.BCC);


if (ObjectUtils.isEmpty(address))
return "";

StringBuilder mailAddr = new StringBuilder();
String emailAddr;
String personal;
for (int i = 0; i < address.length; i++)
emailAddr = address[i].getAddress();
if (emailAddr == null)
emailAddr = "";
else
emailAddr = MimeUtility.decodeText(emailAddr);

personal = address[i].getPersonal();
if (personal == null)
personal = "";
else
personal = MimeUtility.decodeText(personal);

mailAddr.append(",").append(personal).append("< ").append(emailAddr).append("> ");

return mailAddr.toString().substring(1);


/**
* 获得邮件主题
*
* @return
* @throws MessagingException
* @throws UnsupportedEncodingException
*/
public String getSubject() throws MessagingException, UnsupportedEncodingException
String subject = MimeUtility.decodeText(mimeMessage.getSubject());
if (subject == null)
subject = "";

return subject;


/**
* 获得邮件发送日期
*
* @return
* @throws MessagingException
*/
public String getSentDate() throws MessagingException
Date sentDate = mimeMessage.getSentDate();
SimpleDateFormat format = new SimpleDateFormat(NORM_DATETIME_PATTERN);
return format.format(sentDate);


/**
* 获得邮件正文内容
*
* @return
*/
public String getBodyText()
return bodyText.toString();


/**
* 解析邮件，把得到的邮件内容保存到一个StringBuffer对象中，解析邮件
* 主要是根据MimeType类型的不同执行不同的操作，一步一步的解析
* @param part
* @throws MessagingException
* @throws IOException
*/
public void getMailContent(Part part) throws MessagingException, IOException

String contentType = part.getContentType();

int nameIndex = contentType.indexOf("name");

boolean conName = false;

if (nameIndex != -1)
conName = true;


if (part.isMimeType("text/plain") & & conName == false)
bodyText.append((String) part.getContent());
else if (part.isMimeType("text/html") & & conName == false)
bodyText.append((String) part.getContent());
else if (part.isMimeType("multipart/*"))
Multipart multipart = (Multipart) part.getContent();
int counts = multipart.getCount();
for (int i = 0; i < counts; i++)
this.getMailContent(multipart.getBodyPart(i));

else if (part.isMimeType("message/rfc822"))
this.getMailContent((Part) part.getContent());



/**
* 判断此邮件是否需要回执，如果需要回执返回"true",否则返回"false"
*
* @return
* @throws MessagingException
*/
public boolean getReplySign() throws MessagingException

boolean replySign = false;

String needReply[] = mimeMessage.getHeader("Disposition-Notification-To");

if (needReply != null)
replySign = true;

return replySign;


/**
* 判断此邮件是否已读，如果未读返回false,反之返回true
*
* @return
* @throws MessagingException
*/
public boolean isNew() throws MessagingException
boolean isNew = false;
Flags flags = mimeMessage.getFlags();
Flags.Flag[] flag = flags.getSystemFlags();
for (int i = 0; i < flag.length; i++)
if (flag[i] == Flags.Flag.SEEN)
isNew = true;


return isNew;


/**
* 判断此邮件是否包含附件
*
* @param part
* @return
* @throws MessagingException
* @throws IOException
*/
public boolean isContainAttach(Part part) throws MessagingException, IOException
boolean attachFlag = false;
if (part.isMimeType("multipart/*"))
Multipart mp = (Multipart) part.getContent();
BodyPart mPart;
String conType;
for (int i = 0; i < mp.getCount(); i++)
mPart = mp.getBodyPart(i);
String disposition = mPart.getDisposition();
if (Part.ATTACHMENT.equals(disposition) || Part.INLINE.equals(disposition))
attachFlag = true;
else if (mPart.isMimeType("multipart/*"))
attachFlag = this.isContainAttach(mPart);
else
conType = mPart.getContentType();
if (conType.toLowerCase().indexOf("application") != -1 || conType.toLowerCase().indexOf("name") != -1)
attachFlag = true;



else if (part.isMimeType("message/rfc822"))
attachFlag = isContainAttach((Part) part.getContent());

return attachFlag;


/**
* 保存附件
*
* @param part
* @throws MessagingException
* @throws IOException
*/
public void saveAttachMent(Part part) throws MessagingException, IOException
String fileName;
if (part.isMimeType("multipart/*"))
Multipart mp = (Multipart) part.getContent();
BodyPart mPart;
for (int i = 0; i < mp.getCount(); i++)
mPart = mp.getBodyPart(i);
String disposition = mPart.getDisposition();
if (Part.ATTACHMENT.equals(disposition) || Part.INLINE.equals(disposition))
fileName = mPart.getFileName();
if (null != fileName & & fileName.toLowerCase().indexOf("gb2312") != -1)
fileName = MimeUtility.decodeText(fileName);

this.saveFile(fileName, mPart.getInputStream());
else if (mPart.isMimeType("multipart/*"))
this.saveAttachMent(mPart);
else
fileName = mPart.getFileName();
if ((fileName != null) & & (fileName.toLowerCase().indexOf("GB2312") != -1))
fileName = MimeUtility.decodeText(fileName);
this.saveFile(fileName, mPart.getInputStream());



else if (part.isMimeType("message/rfc822"))
this.saveAttachMent((Part) part.getContent());



/**
* 设置附件存放路径
*
* @param attachPath
*/
public void setAttachPath(String attachPath)
this.saveAttachPath = attachPath;


/**
* 获得附件存放路径
*
* @return
*/
public String getAttachPath()
return saveAttachPath;


/**
* 真正的保存附件到指定目录里
*
* @param fileName
* @param in
* @throws IOException
*/
private void saveFile(String fileName, InputStream in) throws IOException
String osName = System.getProperty("os.name");
String storeDir = this.getAttachPath();
if (null == osName)
osName = "";

if (osName.toLowerCase().indexOf("win") != -1)
if (ObjectUtils.isEmpty(storeDir))
storeDir = "C:\\\\tmp";
else
storeDir = "/tmp";

//fileName=fileName.replace("=?", "");
//fileName=fileName.replace("?=", "");
//fileName = fileName.substring(fileName.length() - 6, fileName.length());
FileOutputStream fos = new FileOutputStream(new File(storeDir + File.separator + fileName));
IOUtils.copy(in, fos);
IOUtils.closeQuietly(fos);
IOUtils.closeQuietly(in);


/**
* 获取163邮箱信息
*
* @param host
* @param username
* @param password
* @param protocol
* @return
* @throws MessagingException
*/
public static Message[] getWEMessage(String host, String username, String password, String protocol) throws MessagingException
//创建属性对象
Properties props = System.getProperties();
props.setProperty("mail.store.protocol", protocol);
//创建会话
Session session = Session.getDefaultInstance(props, null);
//存储对象
Store store = session.getStore(protocol);
//连接
store.connect(host, username, password);
//创建目录对象
Folder folder = store.getFolder("INBOX");
if (folder instanceof IMAPFolder)
IMAPFolder imapFolder = (IMAPFolder)folder;
//javamail中使用id命令有校验checkOpened, 所以要去掉id方法中的checkOpened();
imapFolder.doCommand(new IMAPFolder.ProtocolCommand()
public Object doCommand(IMAPProtocol p) throws com.sun.mail.iap.ProtocolException
p.id("FUTONG");
return null;

);

if(folder != null)
folder.open(Folder.READ_WRITE);

return folder.getMessages();


/**
* 获取qq邮箱信息
*
* @param host
* @param username
* @param password
* @param protocol
* @return
* @throws MessagingException
*/
public static Message[] getQQMessage(String host, String username, String password, String protocol) throws MessagingException
//创建属性对象
Properties props = new Properties();
props.put("mail.store.protocol", protocol);
//创建会话
Session session = Session.getDefaultInstance(props, null);
//存储对象
Store store = session.getStore(protocol);
//连接
store.connect(host,username,password);
//创建目录对象
Folder folder = store.getFolder("Inbox");
if(folder != null)
folder.open(Folder.READ_WRITE);

return folder.getMessages();


/**
* 过滤邮箱信息
*
* @param messages
* @param fromMail 只读取该邮箱发来的邮件，如果为空则不过滤
* @param startDate 只读取该日期以后的邮件，如果为空则不过滤
* @return
* @throws MessagingException
*/
public static List< Message> filterMessage(Message[] messages, String fromMail, String startDate) throws MessagingException, ParseException
List< Message> messageList = new ArrayList< > ();
if (ObjectUtils.isEmpty(messages))
return messageList;

boolean isEnptyFromMail = ObjectUtils.isEmpty(fromMail);
boolean isEnptyStartDate = ObjectUtils.isEmpty(startDate);
if (isEnptyFromMail & & isEnptyStartDate)
return Arrays.asList(messages);


String from;
for (Message message: messages)
from = null;
if(message.getFrom() != null)
from = (message.getFrom()[0]).toString();

if (isEnptyFromMail)
if (message.getSentDate() != null & & new SimpleDateFormat(NORM_DATETIME_PATTERN).parse(startDate).getTime() > message.getSentDate().getTime())
continue;

else if (null != from & & from.contains(fromMail))
if (!isEnptyStartDate & & new SimpleDateFormat(NORM_DATETIME_PATTERN).parse(startDate).getTime() > message.getSentDate().getTime())
continue;

else
continue;

messageList.add(message);

return messageList;


/**
* 打印邮件
*
* @param messageList
* @throws IOException
* @throws MessagingException
*/
public static void printMailMessage(List< Message> messageList) throws IOException, MessagingException
System.out.println("邮件数量:" + messageList.size());
ShowMail re;
Message message;
for (int i = 0, leng = messageList.size(); i < leng; i++)
message = messageList.get(i);
re = new ShowMail((MimeMessage) message);
System.out.println("邮件【" + i + "】主题:" + re.getSubject());
System.out.println("邮件【" + i + "】发送时间:" + re.getSentDate());
System.out.println("邮件【" + i + "】是否需要回复:" + re.getReplySign());
System.out.println("邮件【" + i + "】是否已读:" + re.isNew());
System.out.println("邮件【" + i + "】是否包含附件:" + re.isContainAttach( message));
System.out.println("邮件【" + i + "】发送人地址:" + re.getFrom());
System.out.println("邮件【" + i + "】收信人地址:" + re.getMailAddress("to"));
System.out.println("邮件【" + i + "】抄送:" + re.getMailAddress("cc"));
System.out.println("邮件【" + i + "】暗抄:" + re.getMailAddress("bcc"));
System.out.println("邮件【" + i + "】发送时间:" + re.getSentDate());
System.out.println("邮件【" + i + "】邮件ID:" + ((MimeMessage) message).getMessageID());
re.getMailContent(message);
System.out.println("邮件【" + i + "】正文内容:\\r\\n" + re.getBodyText());
re.setAttachPath("D:\\\\Download\\\\mailFile\\\\");
re.saveAttachMent(message);



public static void main(String[] args) throws MessagingException, IOException, ParseException
//163登录信息
//邮件服务器
String host = "mail.xx.com";
//邮箱账号
String username = "xx";
//授权码
String password = "yy";
//协议
String protocol = "imaps";
//只读取该邮箱发来的邮件
String fromMail = null;
//只读取该日期以后的邮件
String startDate = null;
List< Message> messageList = filterMessage(getWEMessage(host, username, password, protocol), fromMail, startDate);
printMailMessage(messageList);

//qq登录信息
String host2 = "imap.qq.com";
String username2 = "xx";
String password2 = "yy";
// String protocol2 = "imaps";
String protocol2 = "pop3";
String fromMail2 = null;
String startDate2 = null;
List< Message> messageList2 = filterMessage(getQQMessage(host2, username2, password2, protocol2), fromMail2, startDate2);
printMailMessage(messageList2);