receive.java

java网络编程 包含全书所有代码编程以及实例

package receivemail_authentic;

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import java.io.*;
/**
* 带口令验证的邮件接收类.
*/
public class Receive{

/**
* Main 方法
*/
    public static void main(String args[]){
        try{
          String popServer="202.205.84.216";
          String popUser= null;
          String popPassword= null;
          receive(popServer, popUser, popPassword);
        }
        catch (Exception ex){
          System.out.println("Usage: java com.receivemail_ahthentic.Receive" +" popServer popUser popPassword");
        }
        System.exit(0);
    }
    public static void receive(String popServer, String popUser , String popPassword){
        Store store=null;
        Folder folder=null;
        try{
          Properties props = System.getProperties();
          Session session = Session.getDefaultInstance(props, new MailAuthenticator());
          store = session.getStore("pop3");
          store.connect(popServer, null, null);
          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++)
          {
             printMessage(msgs[msgNum]);
          }
        }
        catch (Exception ex){
          ex.printStackTrace();
        }
        finally{
          try{
            if (folder!=null) folder.close(false);
            if (store!=null) store.close();
          }
          catch (Exception ex2) {ex2.printStackTrace();}
        }
    }
/**
* "printMessage()" 打印方法.
*/
    public static void printMessage(Message message){
        try{
          String from=((InternetAddress)message.getFrom()[0]).getPersonal();
          if (from==null) from=((InternetAddress)message.getFrom()[0]).getAddress();
          System.out.println("FROM: "+from);
          String subject=message.getSubject();
          System.out.println("SUBJECT: "+subject);
          Part messagePart=message;
          Object content=messagePart.getContent();
          if (content instanceof Multipart)
          {
            messagePart=((Multipart)content).getBodyPart(0);
            System.out.println("[ Multipart Message ]");
          }
          String contentType=messagePart.getContentType();
          System.out.println("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)
            {
              System.out.println(thisLine);
              thisLine=reader.readLine();
            }
          }
          System.out.println("-----------------------------");
        }
        catch (Exception ex)
        {
          ex.printStackTrace();
        }
    }
}