Programming For Future

HTML Page < html >      < head > < title > welcome </ title >      < script   language = "javascript" >         reqObj=null;         function  varify (){             document. getElementById ("res").innerHTML=" Checking ";              if (window.XMLHttpRequest){                 reqObj=new  XMLHttpRequest ();             }else {                 reqObj=new  ActiveXObject ("Microsoft.XMLHTTP");             } ...

forward() sendRedirect() it is used to invoke another server from one servlet with is same server it can send request to page on another server It forward the same request and response object from one servlet to another servlet. It does not send request and response object to another servlet. Redirection occures within server. it sends response code to client side application to send the request to another serlver or resoures. this method is availabe through RequestDispatcher Object. This is method of response object. It transfer control to another servlet for further processing It send response to browser and then browser agian sends request for second servlet or resource Data submitted to first servlet will be availble for second servlet. Data of first servlet is not availble for secind servlet.

Servlet context Servlet config It is an Object to be shared by all servlets and JSPs. this object is associated to specific servlet unlimited store of data as per as server capability limited support for data handling can be used to collaboration between multiple servlet. It is for single servlet Data stored here can be access from any servlet and JSP Data stored here can be access from the servlet for which this object is associated It is created using getServletContext() method of Servlet class Created using getServletConfig() method Only Single instance available within web application Multiple instances for each servlet. contains global properties like classpath, context path etc Only contains property related to specific servlet.

Session Cookie Data on server-side data on client side unlimited side of data as per as server capability limited support for data data handling It can store any type of data only text age of data is not fixed . fixed destroy after session timeout or logout remains on client machine less data traveling over the network All cookie need to travel each time client sends request to server. More secure mechanism to session tracking less secure

import java.net.*; import java.security.cert.Certificate; import java.io.*; import javax.net.ssl.*; public class SSLTest { public static voi d main(String[] args) throws Exception { String https_url = " https://www.google.com/ " ; URL url; url = new URL(https_url); HttpsURLConnection con = (HttpsURLConnection) url.openConnection(); if (con != null ) { System.out.println( " Response Code : " + con.getResponseCode()); System.out.println( " Cipher Suite : " + con.getCipherSuite()); System.out.println( " \n " ); Certificate[] certs = con.getServerCertificates(); int i=0; for (Certificate cert : certs) { System.out.println( " Cert NO : " +i++); System.out.println( " Cert Type : " + cert.getType()); System.out.printl...

import java.sql.*; public class Dec08_4a { public static void main(String ar[])throws Exception { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection("jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ=database.mdb"); //Connection con = DriverManager.getConnection("jdbc:odbc:mydsn"); Statement st = con.createStatement(); ResultSet rs = st.executeQuery("select * from phoneDirectory"); System.out.println("<phone-directory>"); while (rs.next()) { System.out.println(" <customer>"); String s1 = rs.getString(1); System.out.println(" <customer-name>"+s1+"</customer-name>"); String s2 = rs.getString(2); System.out.println(" <address>"+s2+"</address>"); String s3 = rs.getString(3); System.out.println(" <phone-number>...

import javax.servlet.*; import java.io.*; import java.sql.*;   import javax.servlet.http.*;   public class Employee extends HttpServlet   {   public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException,      ServletException   {   res.setContentType("text/Html");   PrintWriter pw = res.getWriter();   try   {   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");   Connection con=DriverManager.getConnection("jdbc:odbc:dsn");   Statement st=con.createStatement();   ResultSet rs=st.executeQuery("select emp_id,emp_name,emp_dob,mob_no,email from employee");   String tr="";   while(rs.next()){   tr=tr+"<tr>";   tr=tr+"<td>"+rs.getString(1)+"</td>";   tr=tr+"<td>"+rs.getString(2)+"</td>";   tr=tr+"<td>"+rs.getString(3)+"</td>";   tr=tr+"<td>"+rs.getString(4)+"</td>...

StudentRegistration │ index.html │ login.html │ └───WEB-INF │ web.xml │ └───classes login.class login.java regform.class regform.java Index.html <html> <head> <title>registration</title> </head> <body> <form method="post" action="reg"> NAME:<input type="text"name="t1"/><br> ENROLLMENT:<input type="text"name="t2"/><br> PASSWORD:<input type="password"name="t3"/><br> <input type="submit"value="send"/><br> </form> <a href='login.html'>if already registered plz login</a> </body> </html> login.html <html> <head> <title>login</title> </head> <body> <form method="post" action="login"> <h2>ENTER VALID USER NAME AND PASSWORD</h...

JSP code <%@page import="java.sql.*"%> <%! int prod_id=1; String prod_name="Laptop"; int qty=2; float price=22000.30f; %> <% try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con=DriverManager.getConnection("jdbc:odbc:NaveenRahul"); Statement st=con.createStatement(); String query="insert into product values("+prod_id+",'"+prod_name+"',"+qty+","+price+")"; if(st.executeUpdate(query)>0){ out.write("Records inserted"); }else{ out.write("insertion faild"); } }catch(Exception e){ out.write("Exception : "+e); } %> JAVA Codes import java.sql.*; class Insert2{ public static void main(String ar[]){ int prod_id=2; String prod_name="Laptop"; int qty=2; float price=22000.30f; try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con=DriverManager.getConnection(...

SSL TLS SSL stands for Secure Sockets Layer. TLS stands for Transport Layer Security. Netscape originally developed this protocol. The Internet Engineering Task Force (IETF) created TLS as the successor to SSL.TLS as the successor to SSL. SSL works mainly through using public/private key encryption on data. TLS uses stronger encryption algorithms and has the ability to work on different ports It is commonly used on web browsers It is most often used as a setting in email programs SSL connections begin with security and proceed directly to secured communications TLS connections first begin with an insecure “hello” to the server and only switch to secured communications after the handshake between the client and the server is successful

Simple example for the MDB without configuration file.  package  mdb; import  javax.ejb. * ; import  javax.jms. * ; import  javax.naming. * ; public   class MyMDB implements  MessageDrivenBean, MessageListener {    public MyMDB ()    {    } // invoked first after ejbCreate() of MDB    public   void   setMessageDrivenContext ( MessageDrivenContext mdc )    {    } // invoked first after just object creation of MDB    public   void   ejbCreate ()    {      System .out. println ( "ejbCreate(): "   +   this ) ;    } // this method is invoked when any message arrives on the destination for which this MDB has been configured.     public   void   onMessage ( Message inMessage )    {      try    ...

Internal Entities : If entities stored in declaration tag within same document, it is called internal entity. for example <!ENTITY BCA "Bachelor of Computer Application" > It is internal entity and we can use it as &bca; anywhere in the document. When XML parser process these entities, it replaces them to their corresponding values.   External Entities : Entities those point external source of contents like pointing external xml file are referred as External entities. for example; <ENTITY course SYSTEM "/location/course.xml"> this entity is pointing external document course.xml. where XML parser interpret this entity, contents of course.xml document are inserted at the location of entity.   Parameter Entities. Parameter are entites those are used to hold the DTD's declarations as a parameters. Using parameter entities (prefixed with a %), a type entity can be created. Then this entity can replace the parameter list. The % type; entity...

Write a servlet program that takes your name and address from an HTML form and display it. Application index.html WEB-INF web.xml classes Display.java web.xml <web-app> <servlet> <servlet-name>Display</servlet-name> <servlet-class>Display</servlet-class> </servlet> <servlet-mapping> <servlet-name>Display</servlet-name> <url-pattern>/Display</url-pattern> </servlet-mapping> </web-app> Disply.java import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class Display extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter pw=response.getWriter(); String name=request.getParameter("name"); String address=request.getParameter(...

Returns a view of a Deque as a Last-in-first-out (Lifo) Queue. Method add is mapped to push, remove is mapped to pop and so on. This view can be useful when you would like to use a method requiring a Queue but you need Lifo ordering. package  collection.demos; import  java.util.ArrayDeque; import  java.util. Collections ; import  java.util.Deque; import  java.util.Queue; public   class  LifoQueue  {      public   static   void   main ( String []  args )   {         Deque < String >  chars  =   new  ArrayDeque < String > () ;         chars. add ( "A" ) ;         chars. add ( "B" ) ;         chars. add ( "C" ) ;         chars. add ( "D" ) ;    ...

Elements to be added may be specified individually or as an array. The behavior of this convenience method is identical to that of c.addAll(Arrays.asList(elements)), but this method is likely to run significantly faster under most implementations. package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; public   class  AddingElementsToCollection {      public   static   void   main ( String []  args )   {          ArrayList < String >  list1  =   new   ArrayList < String > () ;         list1. add ( "A" ) ;         list1. add ( "B" ) ;         list1. add ( "C" ) ;          System .out. println ( "All elements have been...

package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; public   class  TestingDisjointInCollections {      public   static   void   main ( String []  args )   {          ArrayList < String >  list1  =   new   ArrayList < String > () ;         list1. add ( "A" ) ;         list1. add ( "B" ) ;         list1. add ( "C" ) ;          ArrayList < String >  list2  =   new   ArrayList < String > () ;         list2. add ( "D" ) ;         list2. add ( "E" ) ;         list2. add ( "F" ...

package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; public   class  GettingFrequencyOfElementInCollection {      public   static   void   main ( String []  args )   {          ArrayList < String >  list  =   new   ArrayList < String > () ;         list. add ( "A" ) ;         list. add ( "B" ) ;         list. add ( "C" ) ;         list. add ( "A" ) ;         list. add ( "D" ) ;         list. add ( "A" ) ;         list. add ( "B" ) ;          System .out. println ...

Getting an array list containing the elements returned by the specified enumeration in the order they are returned by the enumeration. This method provides interoperability between legacy APIs that return enumerations and new APIs that require collections. package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; import  java.util. Enumeration ; public   class  GettingListOfEnumeration {      public   static   void   main ( String []  args )   {          ArrayList < String >  list  =   new   ArrayList < String > () ;         list. add ( "A" ) ;         list. add ( "B" ) ;         list. add ( "C" ) ;         list. add ( "D" ) ...

package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; import  java.util. Enumeration ; public   class  GettingEnumerationOfCollection  {      public   static   void   main ( String []  args )   {          ArrayList < String >  list  =   new   ArrayList < String > () ;         list. add ( "A" ) ;         list. add ( "B" ) ;         list. add ( "C" ) ;         list. add ( "D" ) ;          Enumeration < String >  e = Collections . enumeration ( list ) ;          while ( e. hasMoreElements ()){      ...

Returning a comparator that imposes the reverse ordering of the specified comparator. If the specified comparator is null, this method is equivalent to reverseOrder() (in other words, it returns a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface). package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; import  java.util. Comparator ; class  Comparator1  implements   Comparator < String > {      public   int   compare ( String  o1,  String  o2 )   {          return  o1. compareTo ( o2 ) ;      } } public   class  GettingReverseOrderCamparator2  {      public   static   void   main ( String []  args )   {      ...

Returning a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface. (The natural ordering is the ordering imposed by the objects' own compareTo method.) This enables a simple idiom for sorting (or maintaining) collections (or arrays) of objects that implement the Comparable interface in reverse-natural-order. package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; import  java.util. Comparator ; public   class  GettingReverseOrderCamparator  {      public   static   void   main ( String []  args )   {          ArrayList < String >  list = new   ArrayList < String > () ;         list. add ( "A" ) ;         list. add ( "B" ) ;   ...

Returning an immutable list consisting of n copies of the specified object. The newly allocated data object is tiny (it contains a single reference to the data object). This method is useful in combination with the List.addAll method to grow lists. The returned list is serializable. package  collection.demos; import  java.util. Collections ; import  java.util. List ; public   class  NewClass  {      public   static   void   main ( String []  args )   {          List < String >  items = null ;         items = Collections . nCopies ( 10 ,  "test" ) ;          for   ( String  string : items )   {              System .out. println ( string ) ;      ...

Returning the starting position of the first occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence. Returning the starting position of the last occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence. package  collection.demos; import  java.util. ArrayList ; import  java.util. Collections ; import  java.util. List ; public   class  GettingIndexOfSubList  {      public   static   void   main ( String []  args )   {          ArrayList < String >  names  =   new   ArrayList < String > () ;         names. add ( "Naveen" ) ;         names. add ( "Neha" ) ;         names. add ( "Deepak" )...