java接收邮件的探索之旅

场景:目前需要定时收取某个账户未读邮件,保存到elasticsearch doc中去。

使用javaMail收邮件主要有两种协议,一种是pop3,一种是imap。这两种协议都可以用来收邮件,但是在其中的处理上是有区别的。pop3是不支持判断邮件是否为已读的,也就是说你不能直接从收件箱里面取到未读邮件,这需要自己进行判断,然而imap就提供了这样的功能,使用imap时可以很轻松的判断该邮件是否为已读或未读或其他。
由此看来,pop3不适合我的需求【通过每次检索全部,然后判断subject也可以实现,不过每次都需要遍历对比,比较麻烦】
那么我就用imap协议来收取了,pop3和imap只是配置email的url有点区别 其他地方是一样的

pop3和imap主要区别就是能否判断邮件状态的问题,其他的操作都差不多.

准备工作:

邮箱设置打开pop3、imap、smtp收发协议

去你的126|163|qq邮箱 打开设置-pop3 如图
注意重点:

  • 全部接收,不然30天以前的收不到还以为代码有问题
  • 配置授权码,目前163和qq邮箱都是授权码形式,代码里的password位置填写的都是授权码不是邮箱密码
    enter description here

    协议的端口和协议规则

    //协议的内容端口等区别,对应关系如图:
    enter description here

具体的实现代码

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package cn.northpark.utils;
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.URLName;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
/**
* @author github.com/liuhouer
* @有一封邮件就需要建立一个ReciveMail对象
*/
public class MailReceive {
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
private String dateformat = "yy-MM-dd HH:mm"; //默认的日前显示格式
public MailReceive(MimeMessage mimeMessage) {
this.mimeMessage = mimeMessage;
}
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);
}
String personal = address[i].getPersonal();
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 exce) {}
return subject;
}
/**
* 获得邮件发送日期
*/
public String getSentDate() throws Exception {
Date sentdate = mimeMessage.getSentDate();
SimpleDateFormat format = new SimpleDateFormat(dateformat);
return format.format(sentdate);
}
/**
* 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,如果已读返回false,未读返回true】
*/
public boolean isNew() throws MessagingException {
boolean isnew = true;
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 = false;
System.out.println("seen Message.......");
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("storefile's path: " + 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();
}
}
/**
* 测试收邮件代码
*/
public static void main(String args[]) throws Exception {
Properties props = new Properties();
props.setProperty("mail.smtp.host", "smtp.126.com");//指定服务器
props.setProperty("mail.smtp.auth", "true");//指定需要验证
Session session = Session.getDefaultInstance(props);
//IMAP---------------------------------------------------------------------
URLName urln = new URLName("imap", "imap.126.com", 143, null, "用户名不还包含@126.com", "邮箱授权码");
//POP3---------------------------------------------------------
// URLName urln = new URLName("pop3", "pop3.126.com", 110, null, "test", "test");
Store store = session.getStore(urln);
store.connect();
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_WRITE);
// 获取总邮件数
int total = folder.getMessageCount();
System.out.println("-----------------共有邮件:" + total + " 封--------------");
// 得到收件箱文件夹信息,获取邮件列表
System.out.println("未读邮件数:" + folder.getUnreadMessageCount());
Message messages[] = folder.getMessages();
MailReceive pmm = null;
for (int i = 0; i < messages.length; i++) {
System.out.println("======================");
pmm = new MailReceive((MimeMessage) messages[i]);
System.out.println("邮件 " + i + " 未读?: " + pmm.isNew());
if(pmm.isNew()){
// 获得邮件内容===============
pmm.getMailContent((Part) messages[i]);//把内容设置到bodytext
pmm.setAttachPath("d:\\");
pmm.saveAttachMent((Part) messages[i]);
System.out.println("Message " + i + " subject: " + pmm.getSubject());
System.out.println("Message " + i + " sentdate: "+ pmm.getSentDate());
System.out.println("Message " + i + " replysign: "+ pmm.getReplySign());
System.out.println("Message " + i + " containAttachment: "+ pmm.isContainAttach((Part) messages[i]));
System.out.println("Message " + i + " form: " + pmm.getFrom());
System.out.println("Message " + i + " to: "+ pmm.getMailAddress("to"));
System.out.println("Message " + i + " cc: "+ pmm.getMailAddress("cc"));
System.out.println("Message " + i + " bcc: "+ pmm.getMailAddress("bcc"));
pmm.setDateFormat("yy年MM月dd日 HH:mm");
System.out.println("Message " + i + " sentdate: "+ pmm.getSentDate());
System.out.println("Message " + i + " Message-ID: "+ pmm.getMessageId());
System.out.println("Message " + i + " 内容: "+ pmm.getBodyText());
//调接口存到es
}
}
}
}
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