Wednesday, January 25, 2012

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;
}
}
}
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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);
}
}
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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);
}
}
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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>
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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");
}
}
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