multiple upload files

    package com.mp.ws;

    /**
    *
    * @author nitinaggarwal
    *
    */
    public interface IFileUpload {

    public byte[] get1File(String name);

    public byte[][] getMulitpleFiles(String names[]);

    public String getXmlFile(String name);

    }

    package com.mp.ws;

    /**
    *
    * @author nitinaggarwal
    *
    */
    public class FileUpload implements IFileUpload {

    public byte[] get1File(String name) {
    byte data[] = null;

    FileReader fr = new FileReader();
    try {
    data = fr.readBinFilePath(name);
    } catch (Exception e) {
    e.printStackTrace();
    }

    return data;
    }

    public String getXmlFile(String name) {
    String data = null;
    FileReader fr = new FileReader();
    try {
    data = fr.readTextFile(name);
    } catch (Exception e) {
    e.printStackTrace();
    }
    return data;
    }

    public byte[][] getMulitpleFiles(String[] fnames) {

    byte[][] data = new byte[fnames.length][];
    for (int i = 0; i < fnames.length; i++) {
    FileReader fr = new FileReader();
    try {
    data[i] = fr.readBinFilePath(fnames[i]);

    System.out.println("abc" + data[i]);
    } catch (Exception e) {
    e.printStackTrace();
    }
    }
    return data;
    }

    }

    package com.mp.ws;

    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;

    /**
    *
    * @author nitinaggarwal
    *
    */
    public class FileReader {

    public String readTextFile(final String name) throws Exception {
    StringBuffer xmlFromFile = new StringBuffer();
    InputStream instr = null;
    //instr = getFilePath2(name);

    instr = new FileInputStream(name);

    if (instr == null)
    throw new FileNotFoundException();
    InputStreamReader streamreader = null;

    try {

    streamreader = new InputStreamReader(instr);
    int x = 0;
    x = streamreader.read();

    while (x != -1) {
    xmlFromFile.append((char) x);
    x = streamreader.read();

    }

    } catch (Exception e) {

    System.out.println("Exception " + e.getMessage());
    throw e;

    } finally {
    streamreader.close();

    }

    return xmlFromFile.toString();

    }

    public byte[] readBinFileFromClassPath(final String name) throws Exception {

    byte bytearray[] = null;
    FileInputStream fileinputstream = null;
    try {

    fileinputstream = new FileInputStream(getFilePath(name));
    int numberBytes = fileinputstream.available();
    bytearray = new byte[numberBytes];
    fileinputstream.read(bytearray);

    } catch (Exception e) {
    System.out.println("Exception " + e.getMessage());
    throw e;

    } finally {
    if (fileinputstream != null)
    fileinputstream.close();
    }

    return bytearray;
    }

    public byte[] readBinFilePath(final String name) throws Exception {

    byte bytearray[] = null;
    FileInputStream fileinputstream = null;
    try {

    fileinputstream = new FileInputStream(name);
    int numberBytes = fileinputstream.available();
    bytearray = new byte[numberBytes];
    fileinputstream.read(bytearray);

    } catch (Exception e) {
    System.out.println("Exception " + e.getMessage());
    throw e;

    } finally {
    if (fileinputstream != null)
    fileinputstream.close();
    }

    return bytearray;
    }

    public void writeBinFileToPath(String name, byte data[]) throws IOException {

    FileOutputStream fileoutputstream = new FileOutputStream(name);

    try {
    fileoutputstream.write(data);

    } catch (IOException e) {
    System.out.println(e.getMessage());

    } finally {
    if (fileoutputstream != null)
    fileoutputstream.close();
    data = null;
    }

    }

    private InputStream getFilePath2(String filename) {
    return this.getClass().getClassLoader().getResourceAsStream(filename);

    }

    private String getFilePath(String filename) throws FileNotFoundException {
    String path = this.getClass().getClassLoader().getResource(filename)
    .getPath();
    if ("".equals(path))
    throw new FileNotFoundException();
    return path;

    }

    }

    package com.mp.ws;

    /**
    *
    * @author nitinaggarwal
    *
    */
    @javax.jws.WebService(targetNamespace = "http://ws.mp.com/", serviceName = "FileUploadService", portName = "FileUploadPort")
    public class FileUploadDelegate {

    com.mp.ws.FileUpload fileUpload = new com.mp.ws.FileUpload();

    public byte[] get1File(String name) {
    return fileUpload.get1File(name);
    }

    public byte[][] getMulitpleFiles(String[] fnames) {
    return fileUpload.getMulitpleFiles(fnames);
    }

    public String getXmlFile(String name) {
    return fileUpload.getXmlFile(name);
    }

    }

    package com.mp.ws;
    /**
    *
    * @author nitinaggarwal
    *
    */
    public class FileUploadTester {

    public static void main(String[] args) {
    FileUpload fu = new FileUpload();
    String fnames[]= {"c:/uploadme.doc","c:/uploadme.doc","c:/uploadme.doc"};

    byte[][] data = fu.getMulitpleFiles(fnames);

    }
    }

multiple file upload helpful website urls

1.  http://digitarald.de/project/fancyupload/  
2.  http://swfupload.org           
3.  http://jupload.sourceforge.net/
4.  http://jumploader.com/
5.  http://code.google.com/apis/gears/samples/hello_world_file_system.html
6.  http://www.telerik.com/products/aspnet-ajax/upload.aspx#uploading-files
7.  http://www.element-it.com/multiple-file-upload/flash-uploader.aspx
8.  http://stackoverflow.com/questions/582126/best-way-to-upload-multiple-files-from-a-browser

arithmetic operators

//arthemetic operators using switch

import java.io.*;

class Input2

{

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

{

char ch;

InputStreamReader ir=new InputStreamReader(System.in);

BufferedReader br=new BufferedReader(ir);

System.out.println("enter values of x");

int x=Integer.parseInt(br.readLine());

System.out.println("enter values of y");

int y=Integer.parseInt(br.readLine());

System.out.println("enter u r choice");

System.out.println("+ for additon");

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

System.out.println("/ for divide");

System.out.println("* for multipiy");

System.out.println("% for remainder");

ch=(char)br.read();

switch(ch)

{

case '+':

System.out.println("additon:"+(x+y));

break;

case '-':

System.out.println("sub:"+(x-y));

break;

case '*':

System.out.println("mul:"+(x*y));

break;

case '/':

System.out.println("divide:"+(x/y));

break;

case '%':

System.out.println("Remainder:"+(x%y));

break;

}

}

}

Reading an integer from keyboard

// input from key board

import java.io.*;

class Inputint

{

public static void main(String r[])throws IOException

{

InputStreamReader id=new InputStreamReader(System.in);

BufferedReader br=new BufferedReader(id);

System.out.println("enter a interger");

int s=Integer.parseInt(br.readLine());

System.out.println("enter "+s);

}

}

reading a string from keyboard

// input from key board
import java.io.*;
class Inputstring
{
public static void main(String r[])throws IOException
{
//InputStreamReader id=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter a String vslue");
String s=br.readLine();
System.out.println("enter "+s);
}
}

Simple AJAX Program

Simple AJAX Program

Simple AJAX application using java script and JSP.


Files required.

1. ajax.js
2. mainpage.jsp
3. process.jsp
4. web.xml

Code :


1. ajax.js



var xmlHttp;
function postRequest(url) {


if (window.XMLHttpRequest) { // Mozilla, Safari, ...
//alert("other than IE");
 xmlHttp = new XMLHttpRequest();


} else if (window.ActiveXObject) { // IE
//alert("IE only");
 xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");


}


xmlHttp.open('POST', url, true);
xmlHttp.onreadystatechange = function() {

if (xmlHttp.readyState == 4) {
updatepage(xmlHttp.responseText);


}


}


xmlHttp.send(url);


}




function updatepage(str){


document.getElementById("result").innerHTML = "<font color='green' size='15'>" + str + "</font>";


}


function showCurrentTime(){


var url="process.jsp";
postRequest(url);


}


2. mainpage.jsp



<%@ page import="java.util.*" %>
<html>
<head>


<title>Ajax Example</title>
<script type="text/javascript" src="ajax.js"> </script>
</head>


<body>


<h1 align="center"><font color="#000080">Ajax Example</font></h1>
<%
out.println(new Date());
%>
<p><font color="#000080">&nbsp;This very simple Ajax Example retrieves the
current date and time from server and shows on the form. To view the current
date and time click on the following button.</font></p>


<form name="f1">


<p align="center"><font color="#000080">&nbsp;<input value=" Show Time " 
type="button" onclick='JavaScript:showCurrentTime()' name="showdate"></font></p>
<div id="result" align="center"></div>


</form>
<div id=result></div>
</body>


</html>




3. process.jsp



<%@ page import="java.util.*" %>
<%
out.println(new Date());
%>


4. web.xml



<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>AjaxApp1</display-name>
  
  <welcome-file-list>
      <welcome-file>mainpage.jsp</welcome-file>
    
  </welcome-file-list>
</web-app>

Simple AJAX program with struts 1.2

Simple AJAX program with struts 1.2

Files required :

1. ajax.js
2. search.jsp
3. web.xml
4. struts-config.xml
5. SearchForm.java
6. SearchAction.java

Code for running the program :


1. ajax.js

var request;

function createObject() {

if (window.XMLHttpRequest) { // Mozilla, Safari, ...

//alert("other than IE");

request = new XMLHttpRequest();

} else if (window.ActiveXObject) { // IE

//alert("IE only");

request = new ActiveXObject("Microsoft.XMLHTTP");

}

}

function search() {

createObject();

var name=window.document.getElementById("n").value;

var url="search.do?name="+name;

request.open('GET',url,true);

request.send(url);

request.onreadystatechange= callback();

}

function callback() {

if (request.readyState == 4) {

displayInfo(request.responseText);

}

}

function displayInfo(str) {

/*This function is only for testing, not working*/

}

2. search.jsp



<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.util.*" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Search Page</title>
<script type="text/javascript" src="ajax.js">
</script>
</head>
<body>
<table>
<form action="search.do">
<tr>
<td>Enter name Here : </td>
<td><input id="n" type="test" name="name" onkeyup="search()"/></td>
</tr>
<div id="results"></div>
</form>
</table>
</body>
</html>


3. web.xml



<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name />
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>search.jsp</welcome-file>
  </welcome-file-list>
  
</web-app>



4. struts-config.xml



<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">


<struts-config>
<form-beans>
<form-bean name="searchForm" type="com.search.SerachForm"></form-bean>
</form-beans>
  <action-mappings>
  <action path="/search" name="searchForm" type="com.search.SearchAction">
  <forward name="success" path="/search.jsp"></forward>
  </action>
  </action-mappings>
</struts-config>


5. SearchForm.java



package com.search;


import org.apache.struts.action.ActionForm;


public class SerachForm extends ActionForm {
private String name;


public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}


6. SearchAction.java



package com.search;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;


public class SearchAction extends Action{
/*
 * author : Chandrasekhara Kota
 * Date   : 03-Dec-2011
 * Email  : chandunaidu.kota@gmail.com
 * */

public ActionForward execute(ActionMapping am, ActionForm af, HttpServletRequest req, HttpServletResponse res)throws Exception
{
System.out.println("---------------inside the action------------------"+req.getParameter("name"));

return am.findForward("success");
}
}

static variable

/*
static most powerful and beautiful concept  in java .if use static, jvm will load at the time of class load.
 if we use static for a variable it treated as class level variable for every new object will not create new variable existing only used.
*/

public class Static_Variable
{
static String collegename="ghandi college";
public void method1()
{
//incomplete
}
}

static NOT applicable with modifiers

/*
RULE: static keyword not applicable with the
1.final
2. abstract
and class

*/

static applicable

/*
RULE: static keyword only applicable for variables , methods and block but not for classes
*/

public class Static_Demo
{
static int x=10;
static
{
System.out.println(x);
}
public static void main(String arg[])
{
System.out.println("static main method")
}
}

public class

/*
RULE: if we declared a class as public, we can access that class from any where
*/

public class Public_Class
{

}

protected class

/*
RULE: a class declared as protected, than it can be visible or access in the child classes of the same package and out side of the child classes
*/

protected class Protected_Class
{

}

default class

/*
RULE: if not declared a with public or protected, it treated as default class. a default class can access with in the package of the child classes but not out side of  the package.
*/

package com.default.pack;
class Default_Class
{

}


package com.default.pack;
import com.default.pack;
class Default_Class_Use
{
Default_Class dc=new Default_Class();
}


//

package com.other.pack;
import com.default.pack;
class Default_Class_Use
{
Default_Class dc=new Default_Class(); //compile time error
}

abstract class

/*
RULE: we can declare a class as abstract, if we declare a class as abstract that means all the methods in that class need not be abstract. that abstract class may be not with abstract methods or normal methods 
*/

public abstract class Abstract_Class
{
abstract method1();
abstract method2();
public void method3()
{
System.out.println("normal method");
}
}


Demo 2:

public abstract class Empty_Abstract
{

}

in final class

/*
RULE: if we declared a class as final that means in that class all the methods are by default final but variables are not final
And it can not support the inheritance concept. and run time polymorphism But it can support the static polymorphism
*/

public final class Final_Class
{
int x=10;
public void method1()
{
System.out.println(x);
x=20;
System.out.println(x);
}
public void method1(int x)
{
this.x=x;
System.out.println(x);
}
}
class Demo extends Final_Class
{
public void method1()
{
System.out.println("child");
}
}

class can applicable with modifiers

/*
RULE: class can applicable with the following modifiers are
1.public
2.final
3.abstract


*/

class canNOT applicable modifiers are

/*
RULE: class canNOT  applicable with the following modifiers are
1.private
2.protected
3.strictfp (only for methods)
4.synchronized (only for methods/blocks)
5.native (only for methods)
6.volatile (only for variables)
7. transient (only for variables)
8.static (only for methods/variables/blocks)


*/

class

/*
RULE : class is keyword by using class keyword we can achieve the encapsulation mechanism
in oops.
Definition: class is an way of creating user defined data types.
*/

class Class_Structure
{
static variables;
.
.
 instance variables;
.
.
{
//instance block
}
static
{
//static block
}
methods()
{
}
}

final NOT applicable 4

/*
RULE: final key word not applicable for the following modifiers only
1.abstract
2.
3

 in complete
*/

final applicable 4 only

/*
RULE: final key word applicable for the following modifiers only
1.public
2.private
3.protected
4.<<default>>
5.native
6.static
7.
 in complete
*/