Random number generation in Java

import java.util.*;

import java.text.SimpleDateFormat;

import java.util.Date;

public class RandomGen {

public String genRandom() throws Exception {

String random = "";

Date date = new Date();

SimpleDateFormat sdf = new SimpleDateFormat("yyMMddHHmmssSS");

random+=sdf.format(date);

return random;

}

}

Store and Read image from Database Using Java

/* To Store image in database- Store.java */

import java.io.*;

import java.sql.*;

public class Store {

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

{Connection con=null;

String url="";

try{

// Step 1. Load the Type 1 database driver:

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

// Step 2. Create a connection to the database

// using pre-defined Data Source:

File f=new java.io.File("c:/Temp.accdb");

File c=new java.io.File(System.getProperty("user.dir")+"/Temp.accdb");

if(f.exists())

url= "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=" +f.getPath();

else if(c.exists())

url= "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=" +c.getPath();

con = DriverManager.getConnection(url,"","");

File imgfile = new File("D:/semanticweb.jpg");

if(!imgfile.exists())

imgfile=new File("semanticweb.jpg");

FileInputStream fis = new FileInputStream(imgfile);

PreparedStatement psmnt = con.prepareStatement("INSERT INTO IMAGESTORAGE(IMAGE) VALUES(?)");

psmnt.setBinaryStream(1, (InputStream)fis, (int)(imgfile.length()));

int insertCount= psmnt.executeUpdate();

System.out.println(insertCount);

psmnt.close();

con.close();

}

catch(Exception e)

{

System.out.print(""+e);

}

}

}

/* To retrieve image from database and store in local directory- Retrieve.java */

import java.io.*;

import java.sql.*;

public class Retreival

{

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

{

Connection con=null;

String url="";

int c;

// Step 1. Load the Type 1 database driver:

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

// Step 2. Create a connection to the database

// using pre-defined Data Source:

File f=new java.io.File("c:/Temp.accdb");

File ff=new java.io.File(System.getProperty("user.dir")+"/Temp.accdb");

if(f.exists())

url= "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=" +f.getPath();

else if(ff.exists())

url= "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=" +ff.getPath();

con = DriverManager.getConnection(url,"","");

PreparedStatement psmnt = con.prepareStatement("SELECT IMAGE FROM IMAGESTORAGE");

ResultSet rs = psmnt.executeQuery();

if(rs.next())

{

InputStream fis1;

FileOutputStream fos;

fis1 = rs.getBinaryStream("image");

fos = new FileOutputStream(new File("SunsetImageRead.jpg"));

while ((c = fis1.read()) != -1)

{

fos.write(c);

}

fis1.close();

fos.close();

}

}

}

Click here to download Complete workspace (database,image,Retrieve.java, Store.java)

Send Mail in Java

package mail;

import java.util.Properties;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.AddressException;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

public class SendMail {

String MAIL_SERVER = "smtp.gmail.com";

public void Sendmail(String USERNAME,String PASSWORD,String fromAddress,String toAddress,String subject,String message) {

try {

Properties properties = System.getProperties();

properties.put("mail.smtps.host", MAIL_SERVER);

properties.put("mail.smtps.auth", "true");

Session session = Session.getInstance(properties);

MimeMessage msg = new MimeMessage(session);

msg.setFrom(new InternetAddress(fromAddress));

msg.addRecipients(Message.RecipientType.TO, toAddress);

msg.setSubject(subject);

msg.setText(message);

Transport tr = session.getTransport("smtps");

tr.connect(MAIL_SERVER, USERNAME, PASSWORD);

tr.sendMessage(msg, msg.getAllRecipients());

tr.close();

} catch (AddressException ex) {

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

}

catch (MessagingException ex) {

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

}

}

public static void main(String[] args){

String USERNAME="xxxx@gmail.com";

String PASSWORD="your password";

String fromAddress="xxx@gmail.com";

String toAddress="toaddress";

String subject="your subject";

String message="your message";

s.Sendmail(USERNAME, PASSWORD, fromAddress, toAddress, subject, message);

}

}

click here to download mail.jar and SendMail Java bean