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1582
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1 package goodjava.mail;
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2
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3 import java.io.Reader;
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4 import java.io.InputStreamReader;
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5 import java.io.Writer;
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6 import java.io.OutputStreamWriter;
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7 import java.io.IOException;
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8 import java.net.Socket;
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9 import java.util.Base64;
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10
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11
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12 public class Smtp {
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13 private final char[] buf = new char[1000];
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14 private final Socket socket;
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15 private final Reader reader;
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16 private final Writer writer;
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17 public final String ehlo;
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18
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19 public Smtp(Socket socket) throws IOException, SmtpException {
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20 this.socket = socket;
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21 this.reader = new InputStreamReader(socket.getInputStream());
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22 this.writer = new OutputStreamWriter(socket.getOutputStream());
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23 String s = read();
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24 if( !s.startsWith("220") )
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25 throw new SmtpException(s);
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26 write( "EHLO\r\n" );
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27 ehlo = read();
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28 if( !ehlo.startsWith("250") )
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29 throw new SmtpException(ehlo);
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30 }
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31
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32 public void close() throws IOException, SmtpException {
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33 write( "QUIT\r\n" );
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34 String s = read();
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35 if( !s.startsWith("221") )
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36 throw new SmtpException(s);
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37 socket.close();
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38 }
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39
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40 public String authenticate(String username,String password) throws IOException, SmtpException {
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41 String s = "\0" + username + "\0" + password;
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42 s = Base64.getEncoder().encodeToString(s.getBytes());
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43 write( "AUTH PLAIN " + s + "\r\n" );
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44 String r = read();
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45 if( !r.startsWith("235") )
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46 throw new SmtpException(r);
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47 return r;
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48 }
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49
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50 public String from(String address) throws IOException, SmtpException {
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51 write( "MAIL FROM: " + address + "\r\n" );
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52 String r = read();
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53 if( !r.startsWith("250") )
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54 throw new SmtpException(r);
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55 return r;
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56 }
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57
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58 public String to(String address) throws IOException, SmtpException {
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59 write( "RCPT TO: " + address + "\r\n" );
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60 String r = read();
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61 if( !r.startsWith("250") )
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62 throw new SmtpException(r);
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63 return r;
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64 }
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65
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66 public String data(String text) throws IOException, SmtpException {
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67 if( !text.endsWith("\r\n") )
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68 throw new SmtpException("text must end with \\r\\n");
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69 text = text.replace("\r\n.","\r\n..");
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70 write( "DATA\r\n" );
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71 String r = read();
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72 if( !r.startsWith("354") )
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73 throw new SmtpException(r);
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74 write( text + ".\r\n" );
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75 r = read();
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76 if( !r.startsWith("250") )
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77 throw new SmtpException(r);
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78 return r;
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79 }
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80
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81 private String read() throws IOException {
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82 int n = reader.read(buf);
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83 return new String(buf,0,n);
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84 }
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85
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86 private void write(String s) throws IOException {
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87 writer.write(s);
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88 writer.flush();
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89 }
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90
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91 public static void main(String[] args) throws Exception {
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92 Socket socket = new Socket("smtpcorp.com",2525);
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93 Smtp smtp = new Smtp(socket);
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94 smtp.authenticate("smtp@luan.software","luanhost");
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95 smtp.from("smtp@luan.software");
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96 smtp.to("fschmidt@gmail.com");
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97 String text = "\r\n"
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98 +"test2\r\n"
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99 +".q\r\n"
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100 +"x\r\n"
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101 ;
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102 smtp.data(text);
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103 smtp.close();
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104 }
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105 }
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