急......收Email问题

Question

sorry, 是发邮件。用SMTP.

Answer 1

很多SMTP Server现在需要发件人身份验证了，比如szonline.net，263.net都要了。
换个还不需要验证的吧，如21cn.com，要么就改一下程序，不过我还没搞清怎么改。

Answer 2

//password,username
//都要用base64编码。
//这是我写的一个乱七八糟的东西。
//你看看，smtp,pop3的基本命令都在了，参考参考。
//base64编码看看下面的就行了。import java.io.*;
import java.net.*;
import java.util.*;public class AutoReplyEmail {
public static final int SMTP_PORT =25;
public static final int POP3_PORT =110;
   
   protected static final String CRLF ="\n";
   protected String _sender_host ="bootcool";
   protected String _last_response;
   public String username ;
   public String password ;
   
   protected StringBuffer _body  = new StringBuffer();
   protected int mail_numbers;
   protected Vector _from  = new Vector(); 
 
   public AutoReplyEmail(String user,String pass) {
    username =user;
    password =pass;
}

public void CheckFrom(String host)throws IOException,Exception {
   String _host = host;
      InetAddress r_ip = InetAddress.getByName(_host);       Socket socket =new Socket(r_ip,POP3_PORT);
   BufferedReader in =new BufferedReader(
                      new InputStreamReader(socket.getInputStream()));
      PrintWriter out =new PrintWriter(socket.getOutputStream(),true); 
   
   String sender_host = _sender_host;
      readAndCheck("+OK", in);
      send(out,"HELO "+sender_host);
      readAndCheck("+OK", in);
      send(out,"USER "+username);
      readAndCheck("+OK", in);
      send(out,"PASS "+password);
      readAndCheck("+OK", in);
      send(out,"STAT ");
      mail_numbers = checkNumber(in);
      Receive(out,in,mail_numbers);
      send(out,"QUIT");
      socket.close();
  }

  public void ReplyTo(String host,String file_name,boolean auth)
   throws IOException,Exception {
      String _host = host;
      InetAddress r_ip = InetAddress.getByName(_host);       addBodyFromFile(file_name);
      
      Socket socket =new Socket(r_ip,SMTP_PORT);
   BufferedReader in =new BufferedReader(
                      new InputStreamReader(socket.getInputStream()));
      PrintWriter out =new PrintWriter(socket.getOutputStream(),true); 
   
   String sender_host = _sender_host;
      readAndCheck("220", in);
      send(out,"HELO "+sender_host);
      readAndCheck("250", in);
      if(auth)
       { send(out,"AUTH LOGIN");
         readAndCheck("334", in);
         send(out,"base64编码后的用户名");
         readAndCheck("334", in);
         send(out,"base64编码后的密码");
         readAndCheck("235", in);
         sendMail(out,in);
       }
      else sendMail(out,in);
 }

 private void send (PrintWriter out, String command) 
     throws IOException{
      out.println(command);
  }
  
  private int checkNumber(BufferedReader in)throws IOException{
    String result = in.readLine(); 
    int endspace =result.lastIndexOf(" ");
    int beginspace =result.indexOf(" ");
    int number =Integer.parseInt(result.substring(beginspace+1,endspace));
    return number;
 }
  
 private void Receive(PrintWriter out,BufferedReader in,int num)
  throws IOException {
   String result ="no_matter_what";
   for(int i=1;i<=num;i++){
       send(out,"RETR "+i);
       while(result.indexOf(CRLF+"."+CRLF) == -1){ 
           result = in.readLine();
           if(result.startsWith("From: ")){
             int begin = result.indexOf("<");
             int end = result.lastIndexOf(">");
             String temps = result.substring(begin+1,end);
             _from.addElement(temps);
             if(i<num){send(out,"DELE "+i);
                break;
             }
              else {send(out,"DELE "+i);
               return;
              } 
           }
        }
    }
}private void sendMail(PrintWriter out,BufferedReader in)
 throws IOException {
 String mail_address;
 send(out,"MAIL FROM: "+"[email protected]");
 readAndCheck("250",in);
 for(int i=1;i<=mail_numbers;i++){
 mail_address =(String)_from.elementAt(i-1);
 send(out, "RCPT TO: "+mail_address);
 readAndCheck("250",in);
 }
 send(out,"DATA ");
 readAndCheck("354",in);
 send(out,"Subject: "+"hi");
 send(out,"From: "+"[email protected]");
 send(out,"\n");
 out.write(CRLF + _body.toString());
 send(out,CRLF+"."+CRLF);
 send(out,"QUIT");
 readAndCheck("221",in);
}public void addBodyFromFile (String filename)throws IOException {
     File f = new File(filename);
  if (!f.exists())throw new FileNotFoundException();
  if (!f.canRead())throw new SecurityException("file not readable");
  BufferedReader in = new BufferedReader(new FileReader(f));
  String line;
  while ((line = in.readLine()) != null) {
       _body.append(line + "\n");
  }
     in.close();
}private void readAndCheck (String expected, BufferedReader in)
      throws IOException{
           _last_response = in.readLine();
     if(_last_response.startsWith(expected))
        System.out.println(_last_response);
     else ;   
}public static void main(String[] args){ 
  AutoReplyEmail test = new AutoReplyEmail("用户名","密码");
  try{test.CheckFrom("pop.163.net");
      test.ReplyTo("smtp.163.net","d:/test.txt",true);
  }
  catch(Exception e){
  }
 }
}
/////
import java.io.*;
public class Base64Encode {
public Base64Encode(){
}
public static void main(String args[]){
String userInfo = "用户名"; 
String encoding = new sun.misc.BASE64Encoder().encode(userInfo.getBytes()); 
        String userInfo2 = "密码"; 
        System.out.println(encoding);
         String encoding2 = new sun.misc.BASE64Encoder().encode (userInfo2.getBytes());
       System.out.println(encoding2);
 }
}

Answer 3

老大，多看看书，看看smtp协议。
代码都给你了，全都告诉你了,这么清楚。

Answer 4

非常感谢bootcool，我一定要给你加分！！！

Answer 5

http://www.csdn.net/expert/topic/92/92577.shtm