Client.java
import java.io.*;
import java.net.*;
public class Client {
public static void main(String[] args) {
try {
Socket s = new Socket("Localhost", 9999);
BufferedReader r = new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter w = new PrintWriter(s.getOutputStream(), true);
BufferedReader con = new BufferedReader(new InputStreamReader(System.in));
String line;
do {
line = r.readLine();
if( line != null )
System.out.println(line);
line = con.readLine();
w.println(line);
}
while ( !line.trim().equals("bye") );
}
catch (Exception err) {
System.err.println(err);
}
}
}
Server.java
import java.io.*;
import java.net.*;
public class Server {
private ServerSocket server;
public Server(int portnum) {
try{
server = new ServerSocket(portnum);
}
catch (Exception err) {
System.out.println(err);
}
}
public void serve() {
try {
while (true) {
Socket client = server.accept();
BufferedReader r = new BufferedReader(new InputStreamReader(client.getInputStream()));
PrintWriter w = new PrintWriter(client.getOutputStream(), true);
w.println("Welcome to the Java EchoServer. Type 'bye' to close.");
String line;
do {
line = r.readLine();
if( line != null )
w.println("Got: "+ line);
}
while ( !line.trim().equals("bye") );
client.close();
}
}
catch (Exception err) {
System.err.println(err);
}
}
public static void main(String[] args){
Server s = new Server(9999);
s.serve();
}
}
Output
Welcome to the Java EchoServer. Type 'bye' to close.
hi
Got: hi
whats up
Got: whats up
f9
Got: f9 Saturday, October 20, 2012
Echoserver
Tag library with coustom tag
author.tld
authorTagHandler.java
index.jsp
file Structure
output
1.0
au
/WEB-INF/tlds/author ;
authorTagHandler
handler.authorTagHandler
scriptless
authorTagHandler.java
package handler;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.JspFragment;
import javax.servlet.jsp.tagext.SimpleTagSupport;
public class authorTagHandler extends SimpleTagSupport {
@Override
public void doTag() throws JspException {
JspWriter out = getJspContext().getOut();
try {
out.println("welcome to my business");
JspFragment f = getJspBody();
if (f != null) {
f.invoke(out);
}
} catch (java.io.IOException ex) {
throw new JspException("Error in authorTagHandler tag", ex);
}
}
} index.jsp
<%--
Document : index
Created on : Oct 18, 2012, 8:17:18 PM
Author : UTTAM KASUNDARA
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Your Standard Hello World Demo</title>
</head>
<body bgcolor="#ffffff">
<%@taglib uri="/WEB-INF/tlds/author" prefix="au" %>
<au:authorTagHandler></au:authorTagHandler>
</body>
</html> file Structure
output
Tuesday, October 16, 2012
my sql connectivity
Connection to demonstrate My sql connectivity to student with name and id filled
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class mysql1 {
public static void main(String[] args)
{
try {
System.out.println("My sql Connect Example.");
Connection conn = null;
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/databasename","root","");
System.out.println("Connected to the database");
Statement statement = conn.createStatement();
//create table statement
String createStudentTable = "CREATE TABLE student(NAME VARCHAR(64),ID number(10))";
statement.executeUpdate(createStudentTable);
statement.executeUpdate("INSERT INTO student VALUES ( 'UML User Guide','1909')");
statement.executeUpdate("INSERT INTO student VALUES ( 'UML User Guide2','2909')");
statement.execute("UPDATE student SET id=27889 WHERE id=28889");
statement.executeQuery("delete * from student");
conn.close();
System.out.println("Disconnected from database");
} catch (InstantiationException ex) {
Logger.getLogger(mysql1.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(mysql1.class.getName()).log(Level.SEVERE, null, ex);
} catch (SQLException ex) {
Logger.getLogger(mysql1.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(mysql1.class.getName()).log(Level.SEVERE, null, ex);
}
}
} Connect java to Microsoft access(odbc) database
In this example demonstrate the Microsoft access(odbc) connectivity database contain the bank table with sr_no,name,Ac.no,balance,ph.no.
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Connectivity {
public static void main(String args[]){
try {
Connection c;
Statement st;
ResultSet r;
Class.forName("sun.jdbc.odbc.JdcbOdbcDrive");
c = DriverManager.getConnection("jdbc:odbc:Pruthvi”);
st = c.createStatement();
st.executeUpdate("insert into Bank(name,account_no,balance,pn_no) values('uttam',1005,10512,1612)");
r = st.executeQuery("select * from Bank");
System.out.println("Sr.No."+"\t"+"Name"+"\t"+"Ac.No."+"\t"+"Balance"+"\t"+"Ph.No");
while (r.next()) {
System.out.print(r.getInt(1)+"\t");
System.out.print(r.getString(2)+"\t");
System.out.print(r.getInt(3)+"\t");
System.out.print(r.getInt(4)+"\t");
System.out.print(r.getInt(5)+"\t");
System.out.println("");
}
c.close();
st.close();
} catch (SQLException ex) {
Logger.getLogger(Connectivity.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(Connectivity.class.getName()).log(Level.SEVERE, null, ex);
}
}
} statefull visitor counter
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class counter extends HttpServlet
{
@Override
public void doGet(HttpServletRequest req,HttpServletResponse res) throws IOException
{
HttpSession session=req.getSession(true);
Integer count=(Integer)session.getAttribute("count");
if(count==null)
{
count=1;
}
else
{
count=new Integer(count.intValue()+1);
}
session.setAttribute("count", count);
PrintWriter pw=res.getWriter();
pw.println("counter is="+count);
}
} Saturday, October 13, 2012
Create login servlet
Loginservlet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author UTTAM KASUNDARA
*/
@WebServlet(name = "NewServlet", urlPatterns = {"/NewServlet"})
public class Loginservlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
String unm=request.getParameter("unm");
String pass=request.getParameter("pass");
if(unm.equals("uttam") && pass.equals("123")){
out.println("<html><body>wel-come "+unm+"</body></html>");
}
else{
out.println("<html><body>sign again "+unm+"</body></html>");
}
/* TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Loginservlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet Loginservlet at " + request.getContextPath () + "</h1>");
out.println("</body>");
out.println("</html>");
*/
} finally {
out.close();
}
} // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
} URL connection send and properties
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class URLTesting
{
private static Map<String, List<String>> headerMap;
private static boolean key;
public static void main(String args[]) throws MalformedURLException, IOException
{
URL url=new URL("http://www.google.com:80/html/default.asp");
URLConnection urlcon=url.openConnection();
URL urltemp=new URL("http://www.google.com/html/default.asp");
HttpURLConnection httpurlcon=(HttpURLConnection) url.openConnection();
System.out.println("Protocol:"+url.getProtocol());
System.out.println("Port for URL:"+url.getPort());
System.out.println("Port for urltemp:"+urltemp.getPort());
System.out.println("Host:"+url.getHost());
System.out.println("File:"+url.getFile());
//System.out.println("String representation of URl:"+url.getExternalForm());
System.out.println("Content Type:"+urlcon.getContentType());
System.out.println("Content Encoding:"+urlcon.getContentEncoding());
System.out.println("Content Length:"+urlcon.getContentLength());
System.out.println("Date:"+ new Date(urlcon.getDate()));
System.out.println("Last Modified:"+new Date(urlcon.getLastModified()));
System.out.println("Expiration:"+new Date(urlcon.getExpiration()));
System.out.println("Request method:"+httpurlcon.getRequestMethod());
System.out.println("Responsee Message:"+httpurlcon.getResponseMessage());
System.out.println("Response code:"+httpurlcon.getResponseCode());
Map<String, List<String>>
HeaderMap=httpurlcon.getHeaderFields();
Set<String> headerKeys=(Set<String>) HeaderMap.keySet();
System.out.println("....NOW THW HEADER....");
for(String key:headerKeys)
{
System.out.println("Key:"+key);
System.out.println("value:"+HeaderMap.get(key));
System.out.println("--------------");
}
}
static class string {
public string() {
}
}
private static class set<T> {
public set() {
}
}
} how to create dropdown list in java swing
Dropdownlist.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Dropdownlist extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Dropdownlist</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet Dropdownlist at " + request.getContextPath () + "</h1>");
out.println("<form method='get'>");
out.println("<select name='s'>");
for(int i=0;i<10;i++){
out.println("<option name="+i+">"+i+"</option>");
}
out.println("</select>");
out.println("<input type='submit'>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
int b=Integer.parseInt(request.getParameter("s"));
for(int j=1;j<=10;j++){
out.print(b+"*"+j+"=");
out.println(j*b);
out.println("<br>");
}
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
} create stateless visitor counter
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
*
* @author UTTAM
*/
@WebServlet(name = "Visitorcoounter", urlPatterns = {"/Visitorcoounter"})
public class Visitorcoounter extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
public static int counter=0;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
HttpSession ses=request.getSession(true);
Integer count=(Integer)ses.getAttribute("count");
if(count == null){
count=1;
}
else{
count=new Integer(count.intValue()+1);
}
ses.setAttribute("counter",count);
out.println("<html><body>my sessiion"+count+"<body><html> ");
try {
/* TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Visitorcoounter</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet Visitorcoounter at " + request.getContextPath () + "</h1>");
out.println("</body>");
out.println("</html>");
*/
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
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