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JavaMail系列(四) 使用POP3协议接收并解析电子邮件

2016-05-04 15:52 801 查看
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协议接收邮件

*/

public class POP3ReceiveMailTest {

public static void main(String[] args) throws Exception {

receive();

}

/**

* 接收邮件

*/

public static void receive() throws Exception {

// 准备连接服务器的会话信息

Properties props = new Properties();

props.setProperty("mail.store.protocol", "pop3"); // 协议

props.setProperty("mail.pop3.port", "110"); // 端口

props.setProperty("mail.pop3.host", "pop3.163.com"); // pop3服务器

// 创建Session实例对象

Session session = Session.getInstance(props);

Store store = session.getStore("pop3");

store.connect("xyang0917@163.com", "123456abc");

// 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

System.out.println("邮件总数: " + folder.getMessageCount());

// 得到收件箱中的所有邮件,并解析

Message[] messages = folder.getMessages();

parseMessage(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];

System.out.println("------------------解析第" + msg.getMessageNumber() + "封邮件-------------------- ");

System.out.println("主题: " + getSubject(msg));

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");

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("邮件正文:" + (content.length() > 100 ? content.substring(0,100) + "..." : content));

System.out.println("------------------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);

}

/**

* 判断邮件中是否包含附件

* @param msg 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;

}

/**

* 判断邮件是否已读 www.2cto.com

* @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.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;

}

/**

* 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);

}

}

}

/**

* 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 UnsupportedEncodingException, MessagingException,

FileNotFoundException, 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();

}

/**

* 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);

}

}

}

测试结果:



原文链接:http://www.2cto.com/kf/201206/136651.html
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