利用Apache commons net 包实现简单的POP3邮件

import java.io.BufferedReader;

import java.io.IOException;

import java.util.Locale;

 

import org.apache.commons.net.pop3.POP3Client;

import org.apache.commons.net.pop3.POP3MessageInfo;

 

public classEasyPOP3Mail {

    public static void main(String[] args) {

        POP3Clientpop3 = newPOP3Client();

        try {

            pop3.setDefaultPort(110);          

            // We want to timeout if a response takes longer than 60 seconds

            pop3.setDefaultTimeout(60000);

            pop3.connect("pop.qq.com");//QQ邮件～如果邮箱不可用，换一个可用的

            // 输入你的QQ号作为名称 QQ密码作为邮箱密码

            if (pop3.login("fanfangming","123456")){

                POP3MessageInfo[]messages = pop3.listMessages();

                if (messages == null)

                {

                    System.err.println("Could not retrieve message list.");

                    pop3.disconnect();

                    return;

                }

                else if (messages.length== 0)

                {

                    System.out.println("No messages");

                    pop3.logout();

                    pop3.disconnect();

                    return;

                }

 

                for (POP3MessageInfo msginfo : messages) {

                    BufferedReader reader =(BufferedReader) pop3.retrieveMessageTop(msginfo.number,0);

 

                    if (reader == null) {

                        System.err.println("Could not retrieve message header.");

                        pop3.disconnect();

                        System.exit(1);

                    }

                    printMessageInfo(reader,msginfo.number);

                }

 

                pop3.logout();

                pop3.disconnect();

            }

 

        }catch(Exception e) {

            System.out.println("失败");

            e.printStackTrace();

        }

 

    }

   

   public static final voidprintMessageInfo(BufferedReader reader,int id) throws IOException {

        String from = "";

        String subject = "";

        String line;

        while ((line = reader.readLine()) != null)

        {

        Stringlower = line.toLowerCase(Locale.CHINESE);

            if (lower.startsWith("from: ")) {

                from = line.substring(6).trim();

            } else if (lower.startsWith("subject: ")){

                subject =line.substring(9).trim();

            }

        }

        System.out.println(Integer.toString(id) + " From: "+ from + " Subject: " + subject);

   }

}