Program World

resize image to required height and width

2012-06-30T21:45:00.001+05:30

How to resize image to required height and width.

To resize the image firstly need to create a method 'resizeImage()' and pass the required parameters .

Here the 'resizeImage()' method accept 3 parameters (input Stream, required Width , required height )

the code is given below.

public static BufferedImage resizeImage(InputStream in, int requiredWidth, int requiredHeight) throws IOException {

BufferedImage bfrImage = ImageIO.read(in);

int imageWidth = bfrImage.getWidth();

int imageheight = bfrImage.getHeight();

double scalex = (double) requiredWidth / imageWidth;

double scaley = (double) requiredHeight / imageheight;

Image scaledImage = null;

scaledImage = bfrImage.getScaledInstance(imageWidth, imageheight, Image.SCALE_SMOOTH);

BufferedImage destination = new BufferedImage(requiredWidth, requiredHeight, BufferedImage.SCALE_SMOOTH);

Graphics2D g2d = destination.createGraphics();

g2d.scale(scalex, scaley);

g2d.drawImage(scaledImage, 0, 0, null);

g2d.dispose();

return destination;

}

access files inside web inf folder

2012-06-28T10:29:00.000+05:30

how to access files inside web inf folder

Direct accessing to web-inf is not possible by client. And its

restricted. Files inside the WEB-INF is only accessible by the

server.To access files inside web-inf we need to create a

java servlet.

using that servlet we can redirect the request to specified file

inside the web-inf folder. Here we are using a sample pure jsp

project that uses a login page 'login.jsp'. And its inside the

WEB-INF folder. Inside WEB-INF/jsp/login.jsp.

This example code will show how toredirect the request to

to modify the web.xml.

After modifying the web.xml create a class names

LoginController.java'and place the class inside'servletmapping'

package. Code is given below

pckage servletmapping;

import java.io.IOException;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class LoginController extends HttpServlet {

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException{

String location = "/WEB-INF/jsp/login.jsp";

// location of jsp file inside the web inf

RequestDispatcher rd = getServletContext().getRequestDispatcher(location);

rd.forward(req, resp);

}

This is how we redirect the request inside the WEB-INF folder.

when we request '/app/login.jsp' then the corresponding

servlet handle the request(that we are defined inside the

web.xml) and serve the file inside the web inf.And it is not

possible to access the file by typing the exact

location inside the server that is 'WEB-INF/jsp/login.jsp'

Custom Entity Creation in Hibernate

2012-05-01T13:12:00.000+05:30

CUSTOM
ENTITY CREATION

We can create entity class of a table
using hibernate and pojo. And it can be used with hibernate query and hibernate
native sql queries.`@Entity` annotation is used to identify the entity class.

Assume that we use hibernate query to
return particular result from table and map the result to entity.

Example :-

we have 2 table named `shop_type` and
`shop`

And we set `shop_type_id` as foreign
key for `shop ` table

table `shop_type`

shop_type_id	name
1	Hotel
2	M.Market
3	Textile

table `shop`

shop_id	shop_type_Id	name	entry_date
1	1	AVN	03/16/12 12:05 AM
2	1	AKN	03/16/12 12:10 AM
3	2	Reliance m	03/16/12 12:15 AM
4	3	AnimalTXT	03/16/12 12:20 AM

Assume that we have 2 entity classes
named `Shop` and `ShopType`

and so we have two entity
classes.  if we want to select a
particular details from 'shop' table we can simply use our hibernate query

         eg:-
hql  = "from Shop s where
s.shopId = ?";

                     Query
query = session.createQuery(hql);

                     query.setInteger(0,
shopId);

                     (Shop)(query.uniqueResult());

and when we execute this statement .
Hibernate will include all column of `shop` table in select statement by
default and its a background process doing by hibernate. The reason for this
behavior is only then  hibernate can map
this result to corresponding entity class here it is `Shop.class`.

Example for background process is
something like this

 
select s.shop_id,s.shop_type_id,s.name,s.phone_number from shop s
whee

 
s.shop_id = 1;

 we can also use our native sql query also for
select the result.

 Eg :- sql = "select {s.*} from shop s
where s.shop_id = ?";

         SQLQuery
query = session.createSQLQuery(sql);

         query.addEntity("s",
Shop.class);

         query.setInteger(0,
shopId);

         (Shop)(query.uniqueResult());

In this case also we need to select
full column in our select statement.'{}' 
symbol

is used when selecting all
columns  and this tells the hibernate
that all fields are selected.

Until now we select all column from
table using select statements and mapped it to corresponding entity. And we
find that without this way we can't map the result to entity.

Good news is that there is a way to
select specified columns from a table using hibernate native sql quires.

using .addScalar property we
can achieve this.

Eg:-

 sql = "select s.name as sname from
shop s where s.shop_id = ?";

SQLQuery countQuery =
session.createSQLQuery(hql).addScalar("sname",Hibernate.STRING)

return ((Object[])
countQuery.uniqueResult());

But using this properties we can't
map the result in to entity class and it only return  objects .

Until now the result set column names
are assumed to be the same as the column names specified in the mapping
document. This can be problematic for SQL queries which join multiple tables,
since the same column names may appear in more than one table. Assume that if
we have a situation and we want to join two table and select only 3 columns .
So we can use  addScalar property
but if we need to select 10 columns then 
addScalar will not be a proper way to accomplish this task.
Because using lots of addScalar properties will  complicate our task and traveling of data
will be more difficult. Also if we pass this result to velocity there will be
difficulties.

So in this case we can use  custom entity like classes for mapping our
join query result. Using this way we can reduce complexity and it behave like
an entity class object. We can use it anywhere we like. To doing this we need
to create a java class.

This example will give you an clear
idea.

We have a sql query

 sql = SELECT
s.`name`,st.name,,s.entry_date  FROM shop
s JOIN shop_type st ON(s.type_id = st.shop_type_id);

This will return

name	name	entry_date
AVN	Hotel	03/16/12 12:05 AM
AKN	Hotel	03/16/12 12:10 AM
Reliance m	M.Market	03/16/12 12:15 AM
Animal TXT	Textile	03/16/12 12:20 AM

 And i am trying to map the result in to an
custom entity to doing this we need  to
create a class just like entity class . And this class must have variables. And

1.Variable name must be same as
column names in our select statement

2.must include getter and setter
methods for that variables .

3.Data type of variable also same as
in table .

Here data type of column entry_date
is Date in database and so variable `entryDate`.We can see that here some
column have same  names.[1st
and 2nd column have same name]and this will make some problems in
our entity because there is an ambiguity. To solve this we can use alias in our
query and so the column name will change

eg :- SELECT s.`name` as
shopName,st.name as typeName,s.entry_date as entryDate  FROM shop s JOIN shop_type st ON(s.type_id =
st.shop_type_id);

This will return

shopName	typeName	entryDate
AVN	hotel	03/16/12 12:05 AM
AKN	hotel	03/16/12 12:10 AM
Reliance m	M.market	03/16/12 12:15 AM
Animal TXT	textile	03/16/12 12:20 AM

So we can see that now 3 column have
different names 'shopName' and 'typeName',entryDate
respectively. Use this names for creating variable for class `ShopView`
.Now we can create our custom entity class .

Created Class

public class ShopView {

   
private String shopName;

   
private String typeName;

   
private Date  entryDate

   
public String getShopName () {

        return shopName;

}

   
public void setShopName(String shopName) {

        this. shopName = shopName;

}

   
public String get TypeName () {

        return typeName;

}

   
public void setTypeName (String typeName) {

        this. typeName = typeName;

}

   
public Date getEntryDate() {

        return entryDate;

}

   
public void setEntryDate(Date entryDate) {

        this.entryDate = entryDate;

}

}

ShopView is our new custom entity class for
mapping our result.

For mapping our result to our newly
created class we need to  use              query.setResultTransformer(Transformers.aliasToBean(ClassName.class));
method

For our Example we can use like this.

Sql ="SELECT s.`name` as
shopName,st.name as typeName,s.entry_date as entryDate  FROM shop s JOIN shop_type st ON(s.type_id =
st.shop_type_id)";

SQLQuery query =
session.createSQLQuery(sql);

query.setResultTransformer(Transformers.aliasToBean(ShopView
.class));

pager.setResult(query.list());

A ResultTransformer is a nice and
simple interface that allows you to transform any Criteria result element.

  The above query will
return a list which has been instantiated and injected

  into its
corresponding properties or fields in ShopView class.   Using this way we can

  map our result into
any class. This way is  suitable in   case of sql views. Means we

  can create custom
view entities for our needs.

  Use this object in
velocity page example.

   Assume that  we passed 
the result  to velocity and we set
the name as `shopDetailsList`

  then  we can use the list  in velocity as

   #foreach($shopObj in
$shopDetailsList)

      $ shopObj
.shopName

      $ shopObj
.typeName

   #end

How to add label icon in to our Swing List box

2011-07-18T15:23:00.003+05:30

How to add label icon in to our Swing Jlist box

----------------------------------------------------

Steps.

-----

1.create a class(here OnlineUserCellRenderer) and implement ListCellRenderer.

  class OnlineUserCellRenderer extends JLabel implements 

  ListCellRenderer {

        private final Color HIGHLIGHT_COLOR = new Color(0, 0, 128);

        public OnlineUserCellRenderer() {

            setOpaque(true);

            setIconTextGap(12);

        }

        public Component getListCellRendererComponent(JList list, Object value,

                int index, boolean isSelected, boolean cellHasFocus) {

            TestImageList entry = (TestImageList) value;

            setText(entry.getUser());

            if (entry.getImage() != null) {

                setIcon(entry.getImage());

            }

            setIconTextGap(12);

            if (isSelected) {

                setBackground(HIGHLIGHT_COLOR);

                setForeground(Color.white);

            } else {

                setBackground(Color.white);

                setForeground(Color.black);

            }

            return this;

        }

    }

2. Then create a TestImageList class.This class is used to set

   properties for label.

    class TestImageList {

        private final String Name;

        private ImageIcon image;

        public TestImageList(String Name, ImageIcon image) {

            this.Name = Name;

            this.image = image;

        }

        public String getName() {

            return Name;

        }

        public ImageIcon getImage() {

            return image;

        }

        // Override standard toString method to give a useful result

        public String toString() {

            return Name;

        }

    }

3.  Declare DefaultListModel object for inserting data in to jlist

    box in our class import javax.swing.DefaultListModel.and 

    declare a object for DefaultListModel.

    public DefaultListModel model = new DefaultListModel();

4.  Then add elements in to our DefaultListModel for insert it in

    to swing jList box.

    model.add(comboCount, new OnlineUserListEntry(Name, newIcon));

    lstChatlist.setModel(model);

    OnlineUserCellRenderer labelUser = new OnlineUserCellRenderer();

    lstChatlist.setCellRenderer(labelName);

How to resize image using java.

2011-07-18T15:21:00.001+05:30

How to resize image using java.

Steps

1. Import useful libraries in to our class.
    here we need

    import java.awt.image.BufferedImage;
    import javax.swing.Icon;
    import javax.swing.ImageIcon;

2. Then we need to create a function ie 'imageIconResize'
   for resizing the image.and we need to pass some parameters in to
   that function

   here is the function.

public BufferedImage imageIconResize(Image img,int postionX,int
postionY, int width, int hight)

{

BufferedImage bi = new BufferedImage(img.getWidth(null),
img.getHeight(null), BufferedImage.SCALE_FAST); Graphics g = bi.createGraphics();
g.drawImage(img, postionX, postionY, width, hight, null, null);
return bi;

}

3. Then pass the parameters in to our function. for that we must
   have a image.
   In my example i have byte array of image.then convert it to
   ImageIcon.

   ie

  iconImage = new ImageIcon(bytes);

   I use getImage() function for get image from icon object.

  iconImage = new ImageIcon(bytes);
  Image img = iconImage.getImage();

4. So we have a image then we call the function it return a
   BufferedImage object.
   we need to convert it to ImageIcon.

BufferedImage imageIconResize = imageIconResize(img,10,15, 50, 50);
ImageIcon newIcon = new ImageIcon(imageIconResize);

5. Changing the value of parameters will change the size of the
   image.

File upload using spring framework

2011-05-26T16:08:00.001+05:30

Upload file using spring framework

how to upload file using spring.

Upload a file using spring framework is easy.

first of all we must import the required spring classes(that are given below).

To upload file using spring framework we must import 'MultipartHttpServletRequest' and 

'MultipartFile' in to our project.to deal with multi part content in a servelet request we must include

MultipartHttpServletRequest interface. MultipartFile interface is used to store file that are comming with

Multipart HttpServlet Request. Here when the user click the 'Upload Doc' button the corresponding handler function

works in this case 'upLoadHandler()' and the function mapp the request(@RequestMapping(value = "/fileupload.do", method =

RequestMethod.POST)).Then corresponding code executed.after uploading the file server redirect the request to upload page

again.

package fileUpload.document;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import java.io.File;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.multipart.MultipartHttpServletRequest;

import org.springframework.web.servlet.ModelAndView;

@Controller

public class UploadController {

    ModelAndView mav;

//location where to upload file

    private static final String destinationDir = "/mnt/disk1/uploads/";

    @RequestMapping(value = "/upload.do", method = RequestMethod.GET)

    public String uploadPage()

    {

        return "document/upPage";

    }

    @RequestMapping(value = "/fileupload.do", method = RequestMethod.POST)

    public String upLoadHandler(HttpServletRequest req,

            HttpServletResponse res) throws Exception {

        res.setContentType("text/plain");

        if (!(req instanceof MultipartHttpServletRequest)) {

            res.sendError(HttpServletResponse.SC_BAD_REQUEST, "Expected multipart request");

            return null;

        }

        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) req;

        //here "fileUploaded" is the name of the html file upload tag in the web page

    MultipartFile file = multipartRequest.getFile("fileUploaded");

        File destination = new File(destinationDir + file.getOriginalFilename());

        file.transferTo(destination);        

        return "redirect:upload.do";

    }

}

file uploading html

this is the html page for uploading file in to server.only required part of the html

is given.

here we can see that the method is POST and encryption type is

multipart/form-data'

    <form method="post" action="/fileupload.do" enctype="multipart/form-data">

     <input type="file" name="fileUploaded" />

    <input type="submit" value="Upload Doc"/>

    </form>

before writing the code we must include multi part resolver bean in our application-context.xml file

<!-- Configure the multipart resolver -->

 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

 <!-- one of the properties available; the maximum file size in bytes -->

 <property name="maxUploadSize" value="100000"/>

 </bean>

how to make Entity classes using Hibernate mapping file and POJO from Database?

2011-05-19T18:11:00.001+05:30

How to make entity classes using hibernate mapping file and POJO from Database.

Step by step way is given below.

using net beans you can done it easily 

With NetBeans.

assuming that we created a new project named 'HBN_Test'.

then add hibernate and spring framework file to our project.

Making hibernate configuration wizard file

then we need to configure hibernate configuration file in to our program

1.Right click the project then in the 'new' option select 

hibernate configuration wizard option.it will open a new window.

2.Then click next and select appropriate database connection and 

and we can see that database dialect is

'org.hibernate.dialect.MySQLDialect'

3.click finish button

this fill connect hibernate with our database

then

Making hibernate reverse engineering wizard file

1.Right click the project then in the 'new' option select 

hibernate reverse engineering wizard option.it will open a new window

2.click next then we can see the tables in our data base select wanted tables check if  we want to include related tables(forigen  key referance tables)

3.click finish button.

this fill connect hibernate with our selected tables 

then

Making hibernate mapping file and pojo from database

1.Right click the project then in the 'new' option select 

hibernate mapping file and pojo from database option.it will open  a new window 

2.select our hibernate configuration file(hibernate.cfg.xml) and also hibernate    reverse engineering wizard(hibernate.reveng.xml)

3.In general setting section select jdk 5 language features and EJB 3

annotation if we want.

4.then select appropriate package to import our entity classes.

5.then click finish button.

6.this will makes entity classes for our tables in the database.

chat program using java

2011-03-03T18:53:00.005+05:30

Chatting program using Google account

Before using this program you need to download the following jar 

files and include this jar files in to your application libraries.

here we are making a sample chat program for Google.

with this exmaple you can chat with the person who is online.

smack.jar

smackx-debug.jar

smackx-jingle.jar

smackx.jar

package ChatTest;

import java.util.*;

import java.io.*;

import org.jivesoftware.smack.Chat;

import org.jivesoftware.smack.ConnectionConfiguration;

import org.jivesoftware.smack.MessageListener;

import org.jivesoftware.smack.Roster;

import org.jivesoftware.smack.RosterEntry;

import org.jivesoftware.smack.SASLAuthentication;

import org.jivesoftware.smack.XMPPConnection;

import org.jivesoftware.smack.XMPPException;

import org.jivesoftware.smack.packet.Message;

public class ChatTest implements MessageListener {

XMPPConnection connection;

public String[] ids;

public void login(String userName, String password) throws XMPPException {

ConnectionConfiguration config = new ConnectionConfiguration("talk.google.com", 5222, "gmail.com");

config.setSASLAuthenticationEnabled(false);

connection = new XMPPConnection(config);

try {

connection.connect();

SASLAuthentication.supportSASLMechanism("PLAIN", 0);

connection.login(userName, password);

System.out.println(connection.isAuthenticated());

} catch (Exception e) {

System.out.println(e);

System.exit(0);

}

}

public void sendMessage(String message, String to) throws XMPPException {

Chat chat = connection.getChatManager().createChat(to, this);

chat.sendMessage(message);

}

public void displayBuddyList() {

Roster roster = connection.getRoster();

Collection entries = roster.getEntries();

System.out.println("\n\n" + entries.size() + " buddy(ies):");

for (RosterEntry r : entries) {

System.out.println(r.getUser());

}

}

public void disconnect() {

connection.disconnect();

}

public void processMessage(Chat chat, Message message) {

if (message.getType() == Message.Type.chat) {

System.out.println(chat.getParticipant() + " says: " + message.getBody());

}

}

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

 // declare variables

ChatTest c = new ChatTest();

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

String msg;

DataInputStream input = new DataInputStream(System.in);

// turn on the enhanced debugger

XMPPConnection.DEBUG_ENABLED = true;

try {

 // Enter your login information here

System.out.println("Enter Your gmail id");

String userId = input.readLine();

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

String password = input.readLine();

userId = userId.replaceAll("@gmail.com", "");

c.login(userId, password);

System.out.println("-----");

c.displayBuddyList();

System.out.println("-----");

System.out.println("Who do you want to talk to? - Type contacts full email address:");

String talkTo = br.readLine();

System.out.println("-----");

System.out.println("All messages will be sent to " + talkTo);

System.out.println("Enter your message in the console:");

System.out.println("-----\n");

while (!(msg = br.readLine()).equals("bye")) {

c.sendMessage(msg, talkTo);

}

c.disconnect();

System.exit(0);

} catch (Exception e) {

System.out.println("Sorry Failed");

System.exit(0);

}

}

}

using this chat program.you can chat with one person at a time. 

Sending mail using java program

2011-03-03T10:56:00.039+05:30

Chatting program using Google talk account

Before using this program you need to download the following jar files

and include this jar files in to your application libraries.

here we are making a sample chat program for Google.

with this exmaple you can chat with the person who is online.

1.smack.jar

2.smackx-debug.jar

3.smackx-jingle.jar

4.smackx.jar

package ChatTest;

import java.util.*;

import java.io.*;

import org.jivesoftware.smack.Chat;

import org.jivesoftware.smack.ConnectionConfiguration;

import org.jivesoftware.smack.MessageListener;

import org.jivesoftware.smack.Roster;

import org.jivesoftware.smack.RosterEntry;

import org.jivesoftware.smack.SASLAuthentication;

import org.jivesoftware.smack.XMPPConnection;

import org.jivesoftware.smack.XMPPException;

import org.jivesoftware.smack.packet.Message;

public class ChatTest implements MessageListener {

XMPPConnection connection;

public String[] ids;

public void login(String userName, String password) throws XMPPException {

ConnectionConfiguration config = new ConnectionConfiguration("talk.google.com", 5222, "gmail.com");

config.setSASLAuthenticationEnabled(false);

connection = new XMPPConnection(config);

try {

connection.connect();

SASLAuthentication.supportSASLMechanism("PLAIN", 0);

connection.login(userName, password);

System.out.println(connection.isAuthenticated());

} catch (Exception e) {

System.out.println(e);

System.exit(0);

}

}

public void sendMessage(String message, String to) throws XMPPException {

Chat chat = connection.getChatManager().createChat(to, this);

chat.sendMessage(message);

}

public void displayBuddyList() {

Roster roster = connection.getRoster();

Collection entries = roster.getEntries();

System.out.println("\n\n" + entries.size() + " buddy(ies):");

for (RosterEntry r : entries) {

System.out.println(r.getUser());

}

}

public void disconnect() {

connection.disconnect();

}

public void processMessage(Chat chat, Message message) {

if (message.getType() == Message.Type.chat) {

System.out.println(chat.getParticipant() + " says: " + message.getBody());

}

}

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

// declare variables

ChatTest c = new ChatTest();

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

String msg;

DataInputStream input = new DataInputStream(System.in);

// turn on the enhanced debugger

XMPPConnection.DEBUG_ENABLED = true;

try {

// Enter your login information here

System.out.println("Enter Your gmail id");

String userId = input.readLine();

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

String password = input.readLine();

userId = userId.replaceAll("@gmail.com", "");

c.login(userId, password);

System.out.println("-----");

c.displayBuddyList();

System.out.println("-----");

System.out.println("Who do you want to talk to? - Type contacts full email address:");

String talkTo = br.readLine();

System.out.println("-----");

System.out.println("All messages will be sent to " + talkTo);

System.out.println("Enter your message in the console:");

System.out.println("-----\n");

while (!(msg = br.readLine()).equals("bye")) {

c.sendMessage(msg, talkTo);

}

c.disconnect();
System.exit(0);
} catch (Exception e) {
System.out.println("Sorry Failed");
System.exit(0);
}
}
}

using this chat program.you can chat with one person at a time.

Generate mySql Script

2011-02-18T15:46:00.005+05:30

I am using Linux Ubuntu 10.x Os

1.Open 'MySql Workbench 5.2.31'

2.Select your Default Database

3.Select 'Database' option In menu bar

4.Then Select 'Reverse Engineer' or press 'ctrl+R'

5.It Will Open A 'model' Window Dont Close it

6.Then select 'File' option in menu bar

7.Select 'Export' then Select 'Forward Engineer Sql Create Script ' option

   /Ctrl+Shift+G it Will open a new Window

8.Click 'Browse' Window Save Your File As '.sql' Extension

9.Then Tick Wanted Options In that Window then Click 'Next' button

10.Then Tick wanted Options.This will import wanted tables into sql Script

     You can Select Views as well as Triggers

11.Then Click 'Next' Button(you Can see Generated Sql Script)

12.Click 'Finish'...Its Done!!!

Program World

resize image to required height and width

How to resize image to required height and width.

access files inside web inf folder

how to access files inside web inf folder

Custom Entity Creation in Hibernate

CUSTOM ENTITY CREATION

How to add label icon in to our Swing List box

How to resize image using java.

How to resize image using java.

File upload using spring framework

Upload file using spring framework

file uploading html

how to make Entity classes using Hibernate mapping file and POJO from Database?

chat program using java

Chatting program using Google account

Sending mail using java program

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I am using Linux Ubuntu 10.x Os