Telnet Client with Java

This example implements Telnet with help of Telnet server. The code connects to the Telnet server and receives data whenever command "1" is entered

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import java.net.*;

import java.io.*;

class TelnetClient

{

    public static void main(String args[]) throws Exception

    {

        //Create object of Socket

        Socket soc=new Socket("localhost",8088);

        String Command;

        //Create object of Input Stream to read from socket

        DataInputStream din=new DataInputStream(soc.getInputStream());    

        //Create object of Output Stream   to write on socket 

        DataOutputStream dout=new DataOutputStream(soc.getOutputStream());

        // Object of Buffered Reader to read command from terminal

        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Welcome to Telnet Client");

        System.out.println("< Telnet Prompt >");

        Command=br.readLine();//reads the command 

        dout.writeUTF(Command);//sends command to server

        System.out.println(din.readLine()); //gets the response of server        

        soc.close();  //close port  

        din.close();  //close input stream     

        dout.close();  //close output stream      

        br.close();   //close buffered Reader    

    }

}

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 Telnet Server Source

Telnet Server with Java

This code sends a string to a client whenever client connects it and sends the response to client when command "1" is received.

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import java.lang.*;

import java.io.*;

import java.net.*;

class TelnetServer {

   public static void main(String args[]) {

      String data = "Hello Client!! ";

      try {

          // Create object of Server Socket 

         ServerSocket srvr = new ServerSocket(8088);

          // Socket object that listens the port (8088) and accepts the incoming connection

          //requests 

         Socket skt = srvr.accept();

         System.out.println("Client Connected!");

         // gets output stream object  

         PrintWriter out = new PrintWriter(skt.getOutputStream(), true);

         //gets input stream object    

         DataInputStream din=new DataInputStream(skt.getInputStream());        

         if(din.readUTF().equals("1")){ 

         // sends response to incoming request if command is '1'    



         System.out.println("String: '" + data);

         out.print(data);

         }

         out.close();// clos out

         skt.close();// close skt

         srvr.close();// close srvr

         din.close(); // close din

      }

      catch(Exception e) {

         System.out.print(e);

      }

   }

}

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Telnet Client Source

Reading and Writhing Data from comm port in Java

This code first write 0x80 to COM port then it reads 0x32 from COM port and then sends 6 more bytes and to terminate the packet it sends 0x70.

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import java.io.*;

import java.util.*;

import javax.comm.*;

import java.sql.Connection;

import  java.sql.DriverManager;

import java.sql.SQLException;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.Statement;



public class Fms implements Runnable{ 

    static Enumeration portList;

    static CommPortIdentifier portId;

    static SerialPort serialPort;

    static OutputStream outputStream;

    static InputStream inputStream;

    static Thread readThread,dataBase;

    static int crf;

    static int cwf;

    static byte cxc[] = new byte[4];

    static int cxm = 128;//0x80

    static byte[] creadBuffer;//1byte read

    static int creadBuff[]; 

    write rt=new write();

    static read rd;   

     public void run() {

     };

    public static void main(String[] args) {

        int a=10;

        write wr = new write();

        read rd = new read(1);

         int b = 0;

        int speed=0,tcount=0,jcount=0,status=0;

      while(b!=10){      

       for(int j =0 ; j<=1;j++){

            try{

        wr.cwritemain(a); 

         rd.cmainx(a);          

         readThread.sleep(1000);

            }

            catch(Exception e){}

            if(j==0){

                status =creadBuff[1];

                jcount =creadBuff[5];

          System.out.println("results : "+status +"\t"+jcount); 

            }

            if(j==1){

                speed =creadBuff[1]*256+creadBuff[2];//to convert received data in decimal

                tcount =creadBuff[6];

          System.out.println("results : "+speed +"\t"+tcount); 

            }

             }    

    }            

       }

 static class write{        

         public void cwritemain(int m)

  {       

             cwf = m;

             cxc[0] = 0x26;

             portList = CommPortIdentifier.getPortIdentifiers();

             System.out.println(portList.hasMoreElements());

   while (portList.hasMoreElements()) {                                   

                                        portId = (CommPortIdentifier) portList.nextElement();

                                        if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {

                                    

     if (portId.getName().equals("COM1"))

     {                                  

      try {

       serialPort = (SerialPort) portId.open("SimpleWriteApp32", 2000);

                                                  } catch (PortInUseException e) {

      }

      try {

       outputStream = serialPort.getOutputStream();



      } catch (Exception e) {

      }

      try {

       serialPort.setSerialPortParams(9600,

         SerialPort.DATABITS_8,

         SerialPort.STOPBITS_1,

         SerialPort.PARITY_NONE);

      } catch (Exception e) {

      }

                                               if(cwf==10){

       try {      

        outputStream.write(cxm);// 0x80 written   

        serialPort.close();

                                                                outputStream.close();        

       } catch (Exception e) {

       }

                                               }

                                        }

                                }

                        }

         }        

    }   

   static class read implements SerialPortEventListener{

      public read(int s) {}

      public void cmainx(int cp) {

   crf = 10;

   portList = CommPortIdentifier.getPortIdentifiers();

   while (portList.hasMoreElements()) {

    portId = (CommPortIdentifier) portList.nextElement();

    if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {

     if (portId.getName().equals("COM1")) {

      try {

                                                    serialPort = (SerialPort) portId.open("readapp32",

         2000);

      } catch (PortInUseException e) {

       System.out.println(e.getMessage());

      }

      try {

       inputStream = serialPort.getInputStream();     

      } catch (Exception e) {

       System.out.println(e);

      }

      try {

       serialPort.addEventListener(this);

      } catch (Exception e) {

       System.out.println(e);

      }

      serialPort.notifyOnDataAvailable(true);

      try {

       serialPort.setSerialPortParams(9600,

         SerialPort.DATABITS_8,

         SerialPort.STOPBITS_1,

         SerialPort.PARITY_NONE);                                                

      } catch (Exception e) {

       System.out.println(e);

      }

     }

    }

   }                       

  }

        public void serialEvent(SerialPortEvent event) {            

            switch (event.getEventType()) {

   case SerialPortEvent.DATA_AVAILABLE:

    creadBuffer = new byte[8];

                                creadBuff= new int[8];

    try {

                                   int i = 0;                               

     while (inputStream.available() > 0) {       

                                          creadBuff[i]=inputStream.read();

                                          System.out.println("Data available is: "+creadBuff[i]);                                                  

                                               i++;

     }

                                      inputStream.close();

    } catch (IOException e) {

    }

                                System.out.println("event");

    System.out.println("recieved \t"+creadBuffer[0] );

    if (creadBuffer[0] == 0x70) {

                                    System.out.println("Got 0x70"+creadBuffer[0] );

     serialPort.close();

     rd = new read(5);

     rd.cmainx(1);// ag

                                }

                                if (creadBuffer[0] == 0x32) {

                                    System.out.println("Got"+creadBuffer[0] );

     serialPort.close();                                

                                }

                                serialPort.close();

            }

        }

   }  

   }



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Send email in Java

//javax.mail
This code sends mail using gmail smtp you may need javax.mail api to implement this code.

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import java.util.Properties;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.Message.RecipientType;

import javax.mail.internet.AddressException;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

import javax.mail.Store;

public class Main {

        public static void main(String[] args) {

try{

                    String host = "smtp.gmail.com";

                    String from = "abc@gmail.com";//your gmail account

                    String pass = "****";//your password of gmail account

                    Properties props = System.getProperties();

                    props.put("mail.smtp.starttls.enable", "true");

                    props.put("mail.smtp.host", host);

                    props.put("mail.smtp.user", from);

                    props.put("mail.smtp.password", pass);

                    props.put("mail.smtp.port", "587");

                    props.put("mail.smtp.auth", "true");

                    String[] to = {"xyz@gmail.com"};

                    // receiver mail address can be other then gmail

                    Session session = Session.getDefaultInstance(props, null);

                    MimeMessage message = new MimeMessage(session);

                    message.setFrom(new InternetAddress(from));

                    InternetAddress[] toAddress = new InternetAddress[to.length];

                    for( int i=0; i < to.length; i++ ) {

                        toAddress[i] = new InternetAddress(to[i]);

                    }

                    System.out.println(Message.RecipientType.TO);

                    for( int i=0; i < toAddress.length; i++) {

                        message.addRecipient(Message.RecipientType.TO, toAddress[i]);

                    }

                    message.setSubject("Java Mail!!!");//set subject of mail

                    message.setText("Hey!!! This is mail from your friend Java!!");//set mail content

                    Transport transport = session.getTransport("smtp");

                    transport.connect(host, from, pass);

                    transport.sendMessage(message, message.getAllRecipients());

                    transport.close();

                    }

                        catch(Exception e)

                    {

                        System.out.println(e);

                    }   

 }        

}

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 Read email using javax.mail source