一個簡單的例子，收取所有郵件并在控制臺輸出。

package cn.jmail.test; import java.io.*;import java.util.*;import javax.mail.*; public class MailReceives {    public static void main(String[] args) {        String pop3Server = "pop3.163.com";        String PRotocol = "pop3";        String username = "xxxx";        String passWord = "xxxx";        Properties prop = new Properties();        prop.setProperty("mail.store.protocol", protocol);        prop.setProperty("mail.pop3.host", pop3Server);        session mailSession = Session.getDefaultInstance(prop,null);        mailSession.setDebug(false);        try {            Store store = mailSession.getStore(protocol);            //登錄驗證            store.connect(pop3Server,username,password);            //獲取郵箱賬戶            Folder folder = store.getFolder("inbox");            //設置訪問權限            folder.open(Folder.READ_WRITE);            //獲取所有郵件            Message[] messages = folder.getMessages();            for(int i=0; i<messages.length; i++){                //主題                String subject = messages[i].getSubject();                //發送者地址                String from = messages[i].getFrom()[0].toString();                System.out.println("第" + (i+1) + "封郵件的主題為：" + subject + "/t發件人地址為：" + from);                System.out.println("你想閱讀此郵件嗎（y/n）？");                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));                String input = bufferedReader.readLine();                if("y".equals(input.toLowerCase())){                    messages[i].writeTo(System.out);                }            }            folder.close(false);            store.close();        } catch (NoSuchProviderException e) {            e.printStackTrace();        } catch (MessagingException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

mail.jar和activation.jar　　http://pan.baidu.com/s/1qW7MaS0

在這里和大家分享一本關于javamail的書籍《Java郵件開發詳解》,大家可以自行百度一下。