package org.yangxin.study.jm;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
/**
* 使用POP3協議接收郵件
*/
public class POP3ReceiveMailTest {
public static void main(String[] args) throws Exception {
receive();
}
/**
* 接收郵件
*/
public static void receive() throws Exception {
// 準備連接服務器的會話信息
Properties props = new Properties();
props.setProperty("mail.store.protocol", "pop3"); // 協議
props.setProperty("mail.pop3.port", "110"); // 端口
props.setProperty("mail.pop3.host", "pop3.163.com"); // pop3服務器
// 創建Session實例對象
Session session = Session.getInstance(props);
Store store = session.getStore("pop3");
store.connect("[email protected]", "123456abc");
// 獲得收件箱
Folder folder = store.getFolder("INBOX");
/* Folder.READ_ONLY：只讀權限
* Folder.READ_WRITE：可讀可寫（可以修改郵件的狀態）
*/
folder.open(Folder.READ_WRITE); //打開收件箱
// 由於POP3協議無法獲知郵件的狀態,所以getUnreadMessageCount得到的是收件箱的郵件總數
System.out.println("未讀郵件數: " + folder.getUnreadMessageCount());
// 由於POP3協議無法獲知郵件的狀態,所以下面得到的結果始終都是爲0
System.out.println("刪除郵件數: " + folder.getDeletedMessageCount());
System.out.println("新郵件: " + folder.getNewMessageCount());
// 獲得收件箱中的郵件總數
System.out.println("郵件總數: " + folder.getMessageCount());
// 得到收件箱中的所有郵件,並解析
Message[] messages = folder.getMessages();
parseMessage(messages);
//釋放資源
folder.close(true);
store.close();
}
/**
* 解析郵件
* @param messages 要解析的郵件列表
*/
public static void parseMessage(Message ...messages) throws MessagingException, IOException {
if (messages == null || messages.length < 1)
throw new MessagingException("未找到要解析的郵件!");
// 解析所有郵件
for (int i = 0, count = messages.length; i < count; i++) {
MimeMessage msg = (MimeMessage) messages[i];
System.out.println("------------------解析第" + msg.getMessageNumber() + "封郵件-------------------- ");
System.out.println("主題: " + getSubject(msg));
System.out.println("發件人: " + getFrom(msg));
System.out.println("收件人：" + getReceiveAddress(msg, null));
System.out.println("發送時間：" + getSentDate(msg, null));
System.out.println("是否已讀：" + isSeen(msg));
System.out.println("郵件優先級：" + getPriority(msg));
System.out.println("是否需要回執：" + isReplySign(msg));
System.out.println("郵件大小：" + msg.getSize() * 1024 + "kb");
boolean isContainerAttachment = isContainAttachment(msg);
System.out.println("是否包含附件：" + isContainerAttachment);
if (isContainerAttachment) {
saveAttachment(msg, "c:\\mailtmp\\"+msg.getSubject() + "_"); //保存附件
}
StringBuffer content = new StringBuffer(30);
getMailTextContent(msg, content);
System.out.println("郵件正文：" + (content.length() > 100 ? content.substring(0,100) + "..." : content));
System.out.println("------------------第" + msg.getMessageNumber() + "封郵件解析結束-------------------- ");
System.out.println();
}
}
/**
* 獲得郵件主題
* @param msg 郵件內容
* @return 解碼後的郵件主題
*/
public static String getSubject(MimeMessage msg) throws UnsupportedEncodingException, MessagingException {
return MimeUtility.decodeText(msg.getSubject());
}
/**
* 獲得郵件發件人
* @param msg 郵件內容
* @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("沒有發件人!");
InternetAddress address = (InternetAddress) froms[0];
String person = address.getPersonal();
if (person != null) {
person = MimeUtility.decodeText(person) + " ";
} else {
person = "";
}
from = person + "<" + address.getAddress() + ">";
return from;
}
/**
* 根據收件人類型，獲取郵件收件人、抄送和密送地址。如果收件人類型爲空，則獲得所有的收件人
* <p>Message.RecipientType.TO 收件人</p>
* <p>Message.RecipientType.CC 抄送</p>
* <p>Message.RecipientType.BCC 密送</p>
* @param msg 郵件內容
* @param type 收件人類型
* @return 收件人1 <郵件地址1>, 收件人2 <郵件地址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("沒有收件人!");
for (Address address : addresss) {
InternetAddress internetAddress = (InternetAddress)address;
receiveAddress.append(internetAddress.toUnicodeString()).append(",");
}
receiveAddress.deleteCharAt(receiveAddress.length()-1); //刪除最後一個逗號
return receiveAddress.toString();
}
/**
* 獲得郵件發送時間
* @param msg 郵件內容
* @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);
}
/**
* 判斷郵件中是否包含附件
* @param msg 郵件內容
* @return 郵件中存在附件返回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;
}
/**
* 判斷郵件是否已讀
* @param msg 郵件內容
* @return 如果郵件已讀返回true,否則返回false
* @throws MessagingException
*/
public static boolean isSeen(MimeMessage msg) throws MessagingException {
return msg.getFlags().contains(Flags.Flag.SEEN);
}
/**
* 判斷郵件是否需要閱讀回執
* @param msg 郵件內容
* @return 需要回執返回true,否則返回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;
}
/**
* 獲得郵件的優先級
* @param msg 郵件內容
* @return 1(High):緊急 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 = "緊急";
else if (headerPriority.indexOf("5") != -1 || headerPriority.indexOf("Low") != -1)
priority = "低";
else
priority = "普通";
}
return priority;
}
/**
* 獲得郵件文本內容
* @param part 郵件體
* @param content 存儲郵件文本內容的字符串
* @throws MessagingException
* @throws IOException
*/
public static void getMailTextContent(Part part, StringBuffer content) throws MessagingException, IOException {
//如果是文本類型的附件，通過getContent方法可以取到文本內容，但這不是我們需要的結果，所以在這裏要做判斷
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);
}
}
}
/**
* 保存附件
* @param part 郵件中多個組合體中的其中一個組合體
* @param destDir 附件保存目錄
* @throws UnsupportedEncodingException
* @throws MessagingException
* @throws FileNotFoundException
* @throws IOException
*/
public static void saveAttachment(Part part, String destDir) throws UnsupportedEncodingException, MessagingException,
FileNotFoundException, IOException {
if (part.isMimeType("multipart/*")) {
Multipart multipart = (Multipart) part.getContent(); //複雜體郵件
//複雜體郵件包含多個郵件體
int partCount = multipart.getCount();
for (int i = 0; i < partCount; i++) {
//獲得複雜體郵件中其中一個郵件體
BodyPart bodyPart = multipart.getBodyPart(i);
//某一個郵件體也有可能是由多個郵件體組成的複雜體
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);
}
}
/**
* 讀取輸入流中的數據保存至指定目錄
* @param is 輸入流
* @param fileName 文件名
* @param destDir 文件存儲目錄
* @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();
}
/**
* 文本解碼
* @param encodeText 解碼MimeUtility.encodeText(String text)方法編碼後的文本
* @return 解碼後的文本
* @throws UnsupportedEncodingException
*/
public static String decodeText(String encodeText) throws UnsupportedEncodingException {
if (encodeText == null || "".equals(encodeText)) {
return "";
} else {
return MimeUtility.decodeText(encodeText);
}
}
}
用java讀取郵箱郵件
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