smtp test 하는 java 코드

SMTP 가 현재 제대로 메일 발송이 되는지 테스트를 하기 위해서 찾아낸 방법입니다.

StringBuffer 안에 응답 요청했던 내용들이 담겨지기 때문에 저 메시지를 이용하여 메일 테스트 내역을 알 수 있었습니다.

package smtp;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class SMTPDemo {

    public static void main(String args[]) throws IOException, UnknownHostException {

        String from = "fromEmail";
        String to = "sendEmail";
        String mailHost = "smtp server";

        SMTP mail = new SMTP(mailHost);
        if (mail != null) {
            /*
            if (mail.send(new FileReader(msgFile), from, to)) {
                System.out.println("Mail sent.");
            } else {
                System.out.println("Connect to SMTP server failed!");
            }
            */

            mail.send( from, to);
        }
        System.out.println("Done.");
    }

    static class SMTP {
        private final static int SMTP_PORT = 25;

        InetAddress mailHost;

        InetAddress localhost;

        BufferedReader in;

        PrintWriter out;

        public SMTP(String host) throws UnknownHostException {
            mailHost = InetAddress.getByName(host);
            localhost = InetAddress.getLocalHost();
            System.out.println("mailhost = " + mailHost);
            System.out.println("localhost= " + localhost);
            System.out.println("SMTP constructor done\n");
        }

        @SuppressWarnings({ "resource", "unused" })
        public boolean send( String from, String to) throws IOException {
            Socket smtpPipe;
            InputStream inn;
            OutputStream outt;

            smtpPipe = new Socket(mailHost, SMTP_PORT);
            if (smtpPipe == null) {
                return false;
            }
            try{

                inn = smtpPipe.getInputStream();
                outt = smtpPipe.getOutputStream();
                in = new BufferedReader(new InputStreamReader(inn));
                out = new PrintWriter(new OutputStreamWriter(outt), true);
                if (inn == null || outt == null) {
                    System.out.println("Failed to open streams to socket.");
                    return false;
                }

                StringBuffer sb = new StringBuffer()
                                        .append("\n"+in.readLine())
                                        .append("HELO " + localhost.getHostName());
                                        out.println("HELO " + localhost.getHostName());
                                        sb.append(in.readLine()+"\n").append("MAIL From:  \n");

                                        out.println("mail from: ");
                                        sb.append(in.readLine()+"\n").append("RCPT TO: \n");

                                        out.println("rcpt to : ");
                                        sb.append(in.readLine()+"\n");
                                        sb.append("SUBJECT:test\n").append("DATA");

                                        out.println("DATA");
                                        out.println("subject : test");
                                        out.println("\n test mail ");
                                        out.println(".");
                                        sb.append(in.readLine()+"\n");

                                        sb.append("test.");
                                        out.println("QUIT");
                                        sb.append(in.readLine() + "\n")
                                        .append("QUIT \n");


                System.out.println(sb.toString());

            }catch(Exception e){
                e.printStackTrace();

            }finally{
                if(in!=null)in.close();
                if(out!=null)out.close();
            }

            return true;
        }
    }
}

/*
String initialID = in.readLine();

System.out.println(initialID);
System.out.println("HELO " + localhost.getHostName());
out.println("HELO " + localhost.getHostName());
String welcome = in.readLine();
System.out.println(welcome);
System.out.println("MAIL From:");
out.println("MAIL From:");
String senderOK = in.readLine();
System.out.println(senderOK);
System.out.println("RCPT TO:");
out.println("RCPT TO:");
String recipientOK = in.readLine();
System.out.println(recipientOK);
System.out.println("DATA");
out.println("DATA");
String line;
System.out.println(msg);
System.out.println(".");
out.println(".");
String acceptedOK = in.readLine();
System.out.println(acceptedOK);
System.out.println("QUIT");
out.println("QUIT");
*/