用javamail接收邮件

package test;

/*****************************************************
*
* @author wuzhenzhong
*
* @since May 7, 2009
*
*****************************************************/
import java.io.*;
import java.text.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

/**
* 有一封邮件就需要建立一个ReciveMail对象
*/
public class ReciveOneMail {
private MimeMessage mimeMessage = null;//消息对象
private String saveAttachPath = ""; //附件下载后的存放目录
private StringBuffer bodytext = new StringBuffer();//存放邮件内容
private String dateformat = "yy-MM-dd HH:mm"; //默认的日前显示格式
/**
* 初使化reciveOneMail时初使化MimeMessage对象
*/
public ReciveOneMail(MimeMessage mimeMessage) {
this.mimeMessage = mimeMessage;
}
/**
* 设置mimeMessage对象
*/
public void setMimeMessage(MimeMessage mimeMessage) {
this.mimeMessage = mimeMessage;
}

/**
* 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 = "";
String personal = address[0].getPersonal();
if (personal == null)
personal = "";
String 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 "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 email = address[i].getAddress();
if (email == null)
email = "";
else {
email = MimeUtility.decodeText(email);//得到mail
}
String personal = address[i].getPersonal();//得到发件人
if (personal == null)
personal = "";
else {
personal = MimeUtility.decodeText(personal);
}
String compositeto = personal + "<" + email + ">";
mailaddr += "," + compositeto;
}
mailaddr = mailaddr.substring(1);
}
} else {
throw new Exception("Error emailaddr type!");
}
return mailaddr;
}

/**
* 获得邮件主题
*/
public String getSubject() throws MessagingException {
String subject = "";
try {
subject = MimeUtility.decodeText(mimeMessage.getSubject());
if (subject == null)
{
subject = "";
}
} catch (Exception e)
{
e.printStackTrace();
}
return subject;
}

/**
* 获得邮件发送日期
*/
public String getSentDate() throws Exception {
Date sentdate = mimeMessage.getSentDate();
SimpleDateFormat format = new SimpleDateFormat(dateformat);
if(sentdate!=null)
{
return format.format(sentdate);
}
else
{
return null;
}
}

/**
* 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();
int nameindex = contenttype.indexOf("name");
boolean conname = false;
if (nameindex != -1)
conname = true;
System.out.println("CONTENTTYPE: " + contenttype);
if (part.isMimeType("text/plain") && !conname) {
bodytext.append((String) part.getContent());
} else if (part.isMimeType("text/html") && !conname) {
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++) {
getMailContent(multipart.getBodyPart(i));
}
} else if (part.isMimeType("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;
}
return replysign;
}

/**
* 获得此邮件的Message-ID
*/
public String getMessageId() throws MessagingException {
return mimeMessage.getMessageID();
}

/**
* 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's length: " + flag.length);
for (int i = 0; i < flag.length; i++) {
if (flag[i] == Flags.Flag.SEEN) {
isnew = true;
System.out.println("已查看的邮件");
break;
}
}
return isnew;
}

/**
* 判断此邮件是否包含附件
*/
public boolean isContainAttach(Part part) throws Exception {
boolean attachflag = false;
@SuppressWarnings("unused")
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;
}

/**
* 在本机上保存附件
*/
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 = "d:\\workweb";
} else {
separator = "/";
storedir = "/workweb";
}
File storefile = new File(storedir + separator + fileName);
System.out.println("storefile's path: " + storefile.toString());
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();
}
}

/**
* PraseMimeMessage类测试
*/
public static void main(String args[]) throws Exception {
Properties props = System.getProperties();
props.put("mail.smtp.host", "smtp.139.com");
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props, null);
URLName urln = new URLName("pop3", "pop3.139.com", 110, null,
"fengl", "fengy");
Store store = session.getStore(urln);
store.connect();
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_ONLY);
Message message[] = folder.getMessages();
System.out.println("Messages's length: " + message.length);
ReciveOneMail pmm = null;
for (int i = 0; i < message.length; i++) {
System.out.println("======================");
pmm = new ReciveOneMail((MimeMessage) message[i]);
System.out.println("Message " + i + " subject: " + pmm.getSubject());
System.out.println("Message " + i + " to: "+ pmm.getMailAddress("to"));
pmm.setDateFormat("yy年MM月dd日 HH:mm");
System.out.println("Message " + i + " senddate: "+ pmm.getSentDate());
// 获得邮件内容
pmm.getMailContent((Part) message[i]);
System.out.println("Message " + i + " bodycontent: \r\n"
+ pmm.getBodyText());
pmm.setAttachPath("c:\\");
pmm.saveAttachMent((Part) message[i]);
System.out.println("======================");
}
}
}