使用javaMail收郵件主要有兩種協定,一種是pop3,一種是imap。這兩種協定都可以用來收郵件,但是在其中的處理上是有差別的。pop3是不支援判斷郵件是否為已讀的,也就是說你不能直接從收件箱裡面取到未讀郵件,這需要自己進行判斷,然而imap就提供了這樣的功能,使用imap時可以很輕松的判斷該郵件是否為已讀或未讀或其他。
此外收件箱中的每一封郵件都對應着一個MessageNumber,是以可以通過一個MessageNumber拿到對應的那封郵件。如:Message message = folder.getMessage(messageNumber);
pop3和imap主要差別就是能否判斷郵件狀态的問題,其他的操作都差不多.
POP3:
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Properties;
import javax.mail.BodyPart;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.MimeMultipart;
public class Email2 {
public static void main(String args[]) throws MessagingException,
IOException {
Properties props = new Properties();
props.setProperty("mail.store.protocol", "pop3");
props.setProperty("mail.pop3.host", "pop3.sohu.com");
Session session = Session.getDefaultInstance(props);
Store store = session.getStore("pop3");
store.connect("[email protected]", "password");
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_WRITE);
// 全部郵件數
int messageCount = folder.getMessageCount();
System.out.println(messageCount);
Message[] messages = folder.getMessages();
for (int i = 0; i < messages.length; i++) {
Message message = messages[i];
System.out.println(message.getSubject());
// 删除郵件
// message.setFlag(Flags.Flag.DELETED, true);
// 标記為已讀
// message.setFlag(Flags.Flag.SEEN, true);
//pop3沒有判斷郵件是否為已讀的功能,要使用Imap才可以
System.out.println("發送時間:" + message.getSentDate());
System.out.println("主題:" + message.getSubject());
System.out.println("内容:" + message.getContent());
//擷取所有的Header,頭資訊
Enumeration headers = message.getAllHeaders();
System.out.println("----------------------allHeaders-----------------------------");
//解析郵件内容
Object content = message.getContent();
if (content instanceof MimeMultipart) {
MimeMultipart multipart = (MimeMultipart) content;
parseMultipart(multipart);
}
System.out
.println("========================================================");
System.out
.println("========================================================");
}
folder.close(true);
store.close();
}
public static void parseMultipart(Multipart multipart) throws MessagingException, IOException {
int count = multipart.getCount();
System.out.println("couont = "+count);
for (int idx=0;idx<count;idx++) {
BodyPart bodyPart = multipart.getBodyPart(idx);
System.out.println(bodyPart.getContentType());
if (bodyPart.isMimeType("text/plain")) {
System.out.println("plain................."+bodyPart.getContent());
} else if(bodyPart.isMimeType("text/html")) {
System.out.println("html..................."+bodyPart.getContent());
} else if(bodyPart.isMimeType("multipart
public static void copy(InputStream is, OutputStream os) throws IOException {
byte[] bytes = new byte[1024];
int len = 0;
while ((len=is.read(bytes)) != -1 ) {
os.write(bytes, 0, len);
}
if (os != null)
os.close();
if (is != null)
is.close();
}
}
IMAP接收郵件程式:
import java.util.Properties;
import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import com.sun.mail.imap.IMAPFolder;
import com.sun.mail.imap.IMAPStore;
public class Mail126Monitor {
public static void main(String[] args) throws Exception {
String user = "[email protected]";// 郵箱的使用者名
String password = "xxxxx"; // 郵箱的密碼
Properties prop = System.getProperties();
prop.put("mail.store.protocol", "imap");
prop.put("mail.imap.host", "imap.126.com");
Session session = Session.getInstance(prop);
int total = 0;
IMAPStore store = (IMAPStore) session.getStore("imap"); // 使用imap會話機制,連接配接伺服器
store.connect("imap.126.com",user, password);
IMAPFolder folder = (IMAPFolder) store.getFolder("INBOX"); // 收件箱
folder.open(Folder.READ_WRITE);
// 擷取總郵件數
total = folder.getMessageCount();
System.out.println("-----------------共有郵件:" + total
+ " 封--------------");
// 得到收件箱檔案夾資訊,擷取郵件清單
System.out.println("未讀郵件數:" + folder.getUnreadMessageCount());
Message[] messages = folder.getMessages();
int messageNumber = 0;
for (Message message : messages) {
System.out.println("發送時間:" + message.getSentDate());
System.out.println("主題:" + message.getSubject());
System.out.println("内容:" + message.getContent());
Flags flags = message.getFlags();
if (flags.contains(Flags.Flag.SEEN))
System.out.println("這是一封已讀郵件");
else {
System.out.println("未讀郵件");
}
System.out
.println("========================================================");
System.out
.println("========================================================");
//每封郵件都有一個MessageNumber,可以通過郵件的MessageNumber在收件箱裡面取得該郵件
messageNumber = message.getMessageNumber();
}
Message message = folder.getMessage(messageNumber);
System.out.println(message.getContent()+message.getContentType());
// 釋放資源
if (folder != null)
folder.close(true);
if (store != null)
store.close();
}
}
本文轉載自: http://hechuanzhen.iteye.com/blog/1733995