java收邮件的例子，java收邮件例子,java收邮件的例子im

java收邮件的例子，java收邮件例子,java收邮件的例子im

java收邮件的例子

import java.net.*;import java.io.*;public class DisplayMail {  public static void main(String arg[]) {       //       //  usage :       //  DisplayMail [mailServer] [user] [password]       //     (will not delete mail on the server)       //       try {         // connect on port 110 (POP3)         System.out.println("Connect to " + arg[0] + ":110");         Socket s = new Socket(arg[0], 110);         BufferedReader in  = new BufferedReader(             new InputStreamReader(s.getInputStream()));         BufferedWriter out = new BufferedWriter(             new OutputStreamWriter(s.getOutputStream()));         DisplayMail mail = new DisplayMail();         mail.login(in, out, arg[1], arg[2]);         int i = mail.check(in,out);         if (i==0) {           System.out.println("No mail waiting.");         }         else {           for (int j=1; j <= i; j++) {              String msg = mail.get(in, out, j);              System.out.println("*****");              System.out.println(msg);              System.out.println("*****");           }           //           // If the mail was removed from the server           // (see getMail()) then we must COMMIT with           // the "QUIT" command :           //   send(out, "QUIT");           //         }       }       catch (Exception e) {         e.printStackTrace();       }    }  public String get       (BufferedReader in, BufferedWriter out, int i)       throws IOException {       String s = "";       String t = "";       send(out, "RETR "+i);       while (((s = in.readLine()) != null)           &&(!(s.equals(".")))) {             t += s + "\n";       }       //       // To remove the mail on the server :       //   send(out, "DELE "+i);       //   receive(in);       //       return t;  }  private void send(BufferedWriter out, String s)    throws IOException {       System.out.println(s);       out.write(s+"\n");       out.flush();  }  private String receive(BufferedReader in)    throws IOException {       String s =  in.readLine();       System.out.println(s);       return s;  }  private void login    (BufferedReader in, BufferedWriter out, String user, String pass)    throws IOException {       receive(in);       send(out, "HELO theWorld");       receive(in);       send(out, "USER " + user);       receive(in);       send(out, "PASS " + pass);       receive(in);  }  private int check     (BufferedReader in, BufferedWriter out)      throws IOException {      return getNumberOfMessages(in, out);  }  public int getNumberOfMessages     (BufferedReader in, BufferedWriter out)      throws IOException {       int i = 0;       String s;       send(out, "LIST");       receive(in);       while((s = receive(in)) != null) {          if (!(s.equals("."))) {              i++;          }          else {              return i;          }       }       return 0;  }}