Send email in Java with attachment

Java Mail API is required to work with this code to send email in Java from your email account with attachments .

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import java.util.Properties;

import javax.activation.DataHandler;

import javax.activation.DataSource;

import javax.activation.FileDataSource;

import javax.mail.*;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeBodyPart;

import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeMultipart;

public class MailWithAttachment

{

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

{

    String host = "smtp.gmail.com";//host name

    String from = "abc@gmail.com";//sender id

    String to = "xyz@yahoo.com";//reciever id

    String pass = "***";//sender's password 

    String fileAttachment = "test.txt";//file name for attachment 

    //system properties

    Properties prop = System.getProperties();

    // Setup mail server properties

    prop.put("mail.smtp.gmail", host);

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

    prop.put("mail.smtp.host", host);

    prop.put("mail.smtp.user", from);

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

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

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

    //session 

    Session session = Session.getInstance(prop, null);

    // Define message

    MimeMessage message = new MimeMessage(session);

    message.setFrom(new InternetAddress(from));

    message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));

    message.setSubject("Hello Java Mail Attachment");

    // create the message part 

    MimeBodyPart messageBodyPart = new MimeBodyPart();

    //message body

    messageBodyPart.setText("Hi");

    Multipart multipart = new MimeMultipart();

    multipart.addBodyPart(messageBodyPart);

    //attachment

    messageBodyPart = new MimeBodyPart();

    DataSource source = new FileDataSource(fileAttachment);

    messageBodyPart.setDataHandler(new DataHandler(source));

    messageBodyPart.setFileName(fileAttachment);

    multipart.addBodyPart(messageBodyPart);

    message.setContent(multipart);

    //send message to reciever

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

    transport.connect(host, from, pass);

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

    transport.close();

}

}

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Database Connctions in Java

This example Works with MS Access to explain DB concepts and can be changed accordingly to any other database for that you will need to configure their respective JAR libraries to your project i.e. for MY-SQL you will need MySQL-Connector JAR.

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import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class dbConnections

{

public static void main(String args[])

{

     try{  

      Class.forName("sun.jdbc.odbc.JdbcOdbc");  //load DB drivers

      Connection con=DriverManager.getConnection("jdbc:odbc:DBName",username,pwd);

      //create db connections

      Statement stmt = con.createStatement(); // creates statement for db access

      String query = "SELECT * FROM Job"; // sql query

      ResultSet rs = stmt.executeQuery(query);

      //execute sql query and stores the result in the result set rs

      while( rs.next() ) {

       System.out.println("Job  "+rs.getString("Job_Id"));

      }

      rs.close(); //close resultset

      stmt.close(); // close statement 

      con.close();  // close connection   

     }

    catch(SQLException e)

    {

     System.out.println(e);

    }

    catch(ClassNotFoundException e)

    {

     System.out.println(e);

   }

}

}

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Read emails from Gmail Account

This code reads emails from a Gmail account to work with this code you will need javax.mail API
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import java.io.BufferedInputStream;

import java.io.IOException;

import java.io.FileWriter;

import java.io.InputStream;

import java.security.*;

import java.util.Properties;

import javax.mail.*;

public class ReadMail {

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

         Properties properties = System.getProperties();

         properties.setProperty("mail.store.protocol", "imaps");

             try {

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

                 //create session instance

                 Store store = session.getStore("imaps");//create store instance

                 store.connect("pop.gmail.com", "abc@gmail.com", "****");

                 //set your user_name and password

                 System.out.println(store); 

                 Folder inbox = store.getFolder("inbox");

                 //set folder from where u wants to read mails

                 inbox.open(Folder.READ_ONLY);//set access type of Inbox

                 Message messages[] = inbox.getMessages();// gets inbox messages

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

                System.out.println("------------ Message " + (i + 1) + " ------------");

                System.out.println("SentDate : " + messages[i].getSentDate()); //print sent date

                System.out.println("From : " + messages[i].getFrom()[0]); //print email id of sender

                System.out.println("Sub : " + messages[i].getSubject()); //print subject of email

                try

                {

                      Multipart mulpart = (Multipart) messages[i].getContent();

                      int count = mulpart.getCount();

                      for (int j = 0; j+1 < count; j++)

                     {

                          storePart(mulpart.getBodyPart(j));

                     }

                }

                catch (Exception ex)

                {

                     System.out.println("Exception arise at get Content");

                     ex.printStackTrace();

                }

           }

           store.close();

      }

catch (Exception e) {

System.out.println(e);  

}  

}

  public static void storePart(Part part) throws Exception

     {    

          InputStream input = part.getInputStream();

          if (!(input instanceof BufferedInputStream))

         {

              input = new BufferedInputStream(input);

          }

          int i;

         System.out.println("msg : ");

          while ((i = input.read()) != -1)

         {

         System.out.write(i);

         }

     }

}

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Send email using javax.mail source

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