java使用javamail读取邮箱（收件箱为例）
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
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.MimeUtility;
/**
* @author yh
*
*/
public class ShowMail {
private MimeMessage mimeMessage = null;
private String saveAttachPath = ""; // 附件下载后的存放目录
private StringBuffer bodyText = new StringBuffer(); // 存放邮件内容的StringBuffer对象
private String dateFormat = "yy-MM-dd HH:mm"; // 默认的日前显示格式
/**
* 构造函数,初始化一个MimeMessage对象
*/
public ShowMail() {
}
public ShowMail(MimeMessage mimeMessage) {
this.mimeMessage = mimeMessage;
System.out.println("创建一个ReceiveEmail对象....");
}
public void setMimeMessage(MimeMessage mimeMessage) {
this.mimeMessage = mimeMessage;
System.out.println("设置一个MimeMessage对象...");
}
/**
* * 获得发件人的地址和姓名
*/
public String getFrom() throws Exception {
InternetAddress address[] = (InternetAddress[]) mimeMessage.getFrom();
String from = address[0].getAddress();
if (from == null) {
from = "";
System.out.println("无法知道发送者.");
}
String personal = address[0].getPersonal();
if (personal == null) {
personal = "";
System.out.println("无法知道发送者的姓名.");
}
String fromAddr = null;
if (personal != null || from != null) {
fromAddr = personal + "<" + from + ">";
System.out.println("发送者是：" + fromAddr);
} else {
System.out.println("无法获得发送者信息.");
}
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
* * "to"----收件人 "cc"---抄送人地址 "bcc"---密送人地址
*/
public String getMailAddress(String type) throws Exception {
String mailAddr = "";
String addType = type.toUpperCase();
InternetAddress[] address = null;
if (addType.equals("TO") || addType.equals("CC")
|| addType.equals("BCC")) {
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 (address != null) {
for (int i = 0; i < address.length; i++) {
String emailAddr = address[i].getAddress();
if (emailAddr == null) {
emailAddr = "";
} else {
System.out.println("转换之前的emailAddr: " + emailAddr);
emailAddr = MimeUtility.decodeText(emailAddr);
System.out.println("转换之后的emailAddr: " + emailAddr);
}
String personal = address[i].getPersonal();
if (personal == null) {
personal = "";
} else {
System.out.println("转换之前的personal: " + personal);
personal = MimeUtility.decodeText(personal);
System.out.println("转换之后的personal: " + personal);
}
String compositeto = personal + "<" + emailAddr + ">";
System.out.println("完整的邮件地址：" + compositeto);
mailAddr += "," + compositeto;
}
mailAddr = mailAddr.substring(1);
}
} else {
throw new Exception("错误的电子邮件类型!");
}
return mailAddr;
}
/**
* * 获得邮件主题
*/
public String getSubject() throws MessagingException {
String subject = "";
try {
System.out.println("转换前的subject：" + mimeMessage.getSubject());
subject = MimeUtility.decodeText(mimeMessage.getSubject());
System.out.println("转换后的subject: " + mimeMessage.getSubject());
if (subject == null) {
subject = "";
}
} catch (Exception exce) {
exce.printStackTrace();
}
return subject;
}
/**
* * 获得邮件发送日期
*/
public String getSentDate() throws Exception {
Date sentDate = mimeMessage.getSentDate();
System.out.println("发送日期 原始类型: " + dateFormat);
SimpleDateFormat format = new SimpleDateFormat(dateFormat);
String strSentDate = format.format(sentDate);
System.out.println("发送日期 可读类型: " + strSentDate);
return strSentDate;
}
/**
* * 获得邮件正文内容
*/
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
*/
public void getMailContent(Part part) throws Exception {
String contentType = part.getContentType();
// 获得邮件的MimeType类型
System.out.println("邮件的MimeType类型: " + contentType);
int nameIndex = contentType.indexOf("name");
boolean conName = false;
if (nameIndex != -1) {
conName = true;
}
System.out.println("邮件内容的类型: " + contentType);
if (part.isMimeType("text/plain") && conName == false) {
// text/plain 类型
bodyText.append((String) part.getContent());
} else if (part.isMimeType("text/html") && conName == false) {
// text/html 类型
bodyText.append((String) part.getContent());
} else if (part.isMimeType("multipart/*")) {
// multipart/*
Multipart multipart = (Multipart) part.getContent();
int counts = multipart.getCount();
for (int i = 0; i < counts; i++) {
getMailContent(multipart.getBodyPart(i));
}
} else if (part.isMimeType("message/rfc822")) {
// message/rfc822
getMailContent((Part) part.getContent());
} else {
}
}
/**
* * 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"
*/
public boolean getReplySign() throws MessagingException {
boolean replySign = false;
String needReply[] = mimeMessage
.getHeader("Disposition-Notification-To");
if (needReply != null) {
replySign = true;
}
if (replySign) {
System.out.println("该邮件需要回复");
} else {
System.out.println("该邮件不需要回复");
}
return replySign;
}
/**
* 获得此邮件的Message-ID
*/
public String getMessageId() throws MessagingException {
String messageID = mimeMessage.getMessageID();
System.out.println("邮件ID: " + messageID);
return messageID;
}
/**
* 判断此邮件是否已读，如果未读返回false,反之返回true
*/
public boolean isNew() throws MessagingException {
boolean isNew = false;
Flags flags = ((Message) mimeMessage).getFlags();
Flags.Flag[] flag = flags.getSystemFlags();
System.out.println("flags的长度: " + flag.length);
for (int i = 0; i < flag.length; i++) {
if (flag[i] == Flags.Flag.SEEN) {
isNew = true;
System.out.println("seen email...");
// break;
}
}
return isNew;
}
/**
* 判断此邮件是否包含附件
*/
public boolean isContainAttach(Part part) throws Exception {
boolean attachFlag = false;
// String contentType = part.getContentType();
if (part.isMimeType("multipart/*")) {
Multipart mp = (Multipart) part.getContent();
for (int i = 0; i < mp.getCount(); i++) {
BodyPart mPart = mp.getBodyPart(i);
String disposition = mPart.getDisposition();
if ((disposition != null)
&& ((disposition.equals(Part.ATTACHMENT)) || (disposition
.equals(Part.INLINE))))
attachFlag = true;
else if (mPart.isMimeType("multipart/*")) {
attachFlag = isContainAttach((Part) mPart);
} else {
String conType = mPart.getContentType();
if (conType.toLowerCase().indexOf("application") != -1)
attachFlag = true;
if (conType.toLowerCase().indexOf("name") != -1)
attachFlag = true;
}
}
} else if (part.isMimeType("message/rfc822")) {
attachFlag = isContainAttach((Part) part.getContent());
}
return attachFlag;
}
/**
* * 保存附件
*/
public void saveAttachMent(Part part) throws Exception {
String fileName = "";
if (part.isMimeType("multipart/*")) {
Multipart mp = (Multipart) part.getContent();
for (int i = 0; i < mp.getCount(); i++) {
BodyPart mPart = mp.getBodyPart(i);
String disposition = mPart.getDisposition();
if ((disposition != null)
&& ((disposition.equals(Part.ATTACHMENT)) || (disposition
.equals(Part.INLINE)))) {
fileName = mPart.getFileName();
if (fileName.toLowerCase().indexOf("gb2312") != -1) {
fileName = MimeUtility.decodeText(fileName);
}
saveFile(fileName, mPart.getInputStream());
} else if (mPart.isMimeType("multipart/*")) {
saveAttachMent(mPart);
} else {
fileName = mPart.getFileName();
if ((fileName != null)
&& (fileName.toLowerCase().indexOf("GB2312") != -1)) {
fileName = MimeUtility.decodeText(fileName);
saveFile(fileName, mPart.getInputStream());
}
}
}
} else if (part.isMimeType("message/rfc822")) {
saveAttachMent((Part) part.getContent());
}
}
/**
* 设置附件存放路径
*/
public void setAttachPath(String attachPath) {
this.saveAttachPath = attachPath;
}
/**
* * 设置日期显示格式
*/
public void setDateFormat(String format) throws Exception {
this.dateFormat = format;
}
/**
* * 获得附件存放路径
*/
public String getAttachPath() {
return saveAttachPath;
}
/**
* * 真正的保存附件到指定目录里
*/
private void saveFile(String fileName, InputStream in) throws Exception {
String osName = System.getProperty("os.name");
String storeDir = getAttachPath();
String separator = "";
if (osName == null) {
osName = "";
}
if (osName.toLowerCase().indexOf("win") != -1) {
separator = "\\";
if (storeDir == null || storeDir.equals(""))
storeDir = "c:\\tmp";
} else {
separator = "/";
storeDir = "/tmp";
}
File storeFile = new File(storeDir + separator + fileName);
System.out.println("附件的保存地址: " + storeFile.toString());
// for(int i=0;storefile.exists();i++){
// storefile = new File(storedir+separator+fileName+i);
// }
BufferedOutputStream bos = null;
BufferedInputStream bis = null;
try {
bos = new BufferedOutputStream(new FileOutputStream(storeFile));
bis = new BufferedInputStream(in);
int c;
while ((c = bis.read()) != -1) {
bos.write(c);
bos.flush();
}
} catch (Exception exception) {
exception.printStackTrace();
throw new Exception("文件保存失败!");
} finally {
bos.close();
bis.close();
}
}
/**
* ReceiveEmail类测试
*/
public static void main(String args[]) throws Exception {
String host = "pop.sina.com";
String username = "***";
String password = "***";
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("pop3");
store.connect(host, username, password);
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_ONLY);
Message message[] = folder.getMessages();
System.out.println("邮件数量: " + message.length);
ShowMail re = null;
for (int i = 0; i < message.length; i++) {
re = new ShowMail((MimeMessage) message[i]);
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((Part) message[i]));
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"));
re.setDateFormat("yy年MM月dd日 HH:mm");
System.out.println("邮件 " + i + " 发送时间: " + re.getSentDate());
System.out.println("邮件 " + i + " 邮件ID: " + re.getMessageId());
re.getMailContent((Part) message[i]);
System.out.println("邮件 " + i + " 正文内容: \r\n" + re.getBodyText());
re.setAttachPath("e:\\");
re.saveAttachMent((Part) message[i]);
}
}
}
javamail.jar 下载链接
