改寫後的使用javamail pop3收信的javabean

最新推荐文章于 2021-08-11 09:18:04 发布

转载最新推荐文章于 2021-08-11 09:18:04 发布 · 665 阅读

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#javamail #exception #string #null #import #properties

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本文提供了一个使用Java接收POP3邮件的示例代码。通过该示例，读者可以了解到如何利用JavaMail API连接到POP3服务器，并获取邮箱中的邮件内容。代码详细展示了设置属性、获取Store、打开文件夹及读取邮件的过程。

/*
*Author:tyfun
*DateTime:2003.01.10
*Package:com.westarsoft.mail
*/

package com.westarsoft.mail;

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import java.io.*;

public class GetMail {
    public static String receive(String popServer, String popUser, String popPassword) {
        String mailContent = "";
        Store store = null;
        Folder folder = null;
        try {
            Properties props = System.getProperties();
            Session session = Session.getDefaultInstance(props, null);
            store = session.getStore("pop3");
            store.connect(popServer, popUser, popPassword);
            folder = store.getDefaultFolder();
            if(folder == null) throw new Exception("No default folder");
            folder = folder.getFolder("INBOX");
            if(folder == null) throw new Exception("No POP3 INBOX");
            folder.open(Folder.READ_ONLY);
            Message[] msgs = folder.getMessages();
            for(int msgNum = 0; msgNum < msgs.length; msgNum++) {
                mailContent = mailContent + getMessage(msgs[msgNum]) + "/n/n/n/n";
            }
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
        finally {
            try {
                if (folder!=null) folder.close(false);
                if (store!=null) store.close();
            }
            catch (Exception ex2) {
                ex2.printStackTrace();
            }
        }
        return mailContent;
    }

    public static String getMessage(Message message) {
        String mailContent = null;
        try {
            String from = ((InternetAddress)message.getFrom()[0]).getPersonal();
            if(from==null) from = ((InternetAddress)message.getFrom()[0]).getAddress();
            mailContent = "FROM: "+from;
            String subject = message.getSubject();
            mailContent = mailContent + "/n" +"SUBJECT: "+subject;
            Part messagePart = message;
            Object content = messagePart.getContent();
            if(content instanceof Multipart) {
                messagePart = ((Multipart)content).getBodyPart(0);
                mailContent = mailContent + "/n" +"[ Multipart Message ]";
            }
            mailContent = mailContent + "/n" +"CONTENT: "+content.toString();
            String contentType = messagePart.getContentType();
            mailContent = mailContent + "/n" +"CONTENT:"+contentType;
            if(contentType.startsWith("text/plain") || contentType.startsWith("text/html")) {
                InputStream is = messagePart.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                String thisLine = reader.readLine();
                while(thisLine!=null) {
                    mailContent = mailContent + "/n" +thisLine;
                    thisLine = reader.readLine();
                }
            }
        }
        catch(Exception ex) {
            ex.printStackTrace();
        }
        return mailContent;
    }
}

<%
        GetMail mail = new GetMail();
        String content = mail.receive("pop3.server.com","user","password");
        if((content.trim() == null)||(content.trim() == "")) {
            System.out.println("No mail!");
        }
        else {
            System.out.println("You got a new mail!");
        }
%>