pls help me tell whats wrong
here is the code of my files
i am a total newbie......pls
t.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" language="javascript" src="ah.js"></script>
</head>
<body>
<table>
<tr>
<td width="36%">Userid j</td>
<td width="33%">
<form name="f1" >
<input type="text" name="user" onBlur="startRequest()"/>
<br>
<input type="button" name="btn" value="click" onClick="startRequest()" /></form>
</td>
<td width="31%" id="results"> </td>
</tr>
</table>
</body>
</html>var xmlHttp;// global instance of XMLHttpRequest
function createXmlHttpRequest()
{
if(window.ActiveXObject)
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)
{
xmlHttp=new XMLHttpRequest();
}
}
function startRequest()
{
createXmlHttpRequest();
alert("hi4");
var u1=document.f1.user.value;
alert("hi");
xmlHttp.open("GET","http://localhost:8080/ajax/Jas?user="+u1 ,true)
alert("hi2");
xmlHttp.onreadystatechange=handleStateChange();
alert("hi3");
xmlHttp.send(null);
}
function handleStateChange()
{alert("handle" );
if(xmlHttp.status==200)
{ alert("ready");
if(xmlHttp.readyState==4)
{alert("status ok");
var message = xmlHttp.responseXML.getElementsByTagName("valid")[0].childNodes[0].nodeValue;
document.getElementById("results").innerHTML=message;
}
else
{
alert("Error loading pagen"+ xmlHttp.status +
":"+xmlHttp.statusText);
}
}
}UserOp.java
import java.sql.*;
import java.util.*;
public class UserOp {
public boolean containsKey(String a)
{
String urlPrefix = "jdbc:db2://localhost:50000/";
String url;
//String user;
String empNo;
Connection con;
Statement stmt;
ResultSet rs;
ArrayList<String> al=new ArrayList<String>();
System.out.println ("**** Enter class EzJava");
url = urlPrefix + "PRAC";
try
{
// Load the driver
Class.forName("com.ibm.db2.jcc.DB2Driver");
System.out.println("**** Loaded the JDBC driver");
// Create the connection using the IBM Data Server Driver for JDBC and SQLJ
con = DriverManager.getConnection (url,"db2inst1","1491");
// Commit changes manually
con.setAutoCommit(false);
System.out.println("**** Created a JDBC connection to the data source");
// Create the Statement
stmt = con.createStatement();
System.out.println("**** Created JDBC Statement object");
// Execute a query and generate a ResultSet instance
rs = stmt.executeQuery("SELECT * FROM USERS");
System.out.println("**** Created JDBC ResultSet object");
// Print all of the employee numbers to standard System.output device
while (rs.next()) {
empNo = rs.getString(2);
al.add(empNo);
System.out.println("Employee number = " + empNo);
}
System.out.println("**** Fetched all rows from JDBC ResultSet");
// Close the ResultSet
rs.close();
System.out.println("**** Closed JDBC ResultSet");
// Close the Statement
stmt.close();
System.out.println("**** Closed JDBC Statement");
// Connection must be on a unit-of-work boundary to allow close
con.commit();
System.out.println ( "**** Transaction committed" );
// Close the connection
con.close();
System.out.println("**** Disconnected from data source");
System.out.println("**** JDBC Exit from class EzJava - no errors");
}
catch (ClassNotFoundException e)
{
System.out.println("Could not load JDBC driver");
System.out.println("Exception: " + e);
e.printStackTrace();
}
catch(SQLException ex)
{
System.err.println("SQLException information");
while(ex!=null) {
System.out.println ("Error msg: " + ex.getMessage());
System.out.println ("SQLSTATE: " + ex.getSQLState());
System.out.println ("Error code: " + ex.getErrorCode());
ex.printStackTrace();
ex = ex.getNextException(); // For drivers that support chained exceptions
}
}
String ia[]=new String[al.size()];
ia=al.toArray(ia);
int c=(ia.length);
boolean ab=false;
System.out.println("sup"+a);
for(int i=0;i<c;i++)
{
if(ia[i].equals(a))
{
ab=true;
System.out.println("up"+ia[i]);
}
else
{
System.out.println(ia[i]);
}
}
if(ab==true)
{
return true;
}
else
{
return false;
}
}
public static void main(String q[])
{
UserOp a=new UserOp();
System.out.println((a.containsKey("jas1291")));
}
}Jas.java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class for Servlet: Jas
*
*/
public class Jas extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
static final long serialVersionUID = 1L;
/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#HttpServlet()
*/
public Jas() {
super();
}
/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String targetId = request.getParameter("user");
System.out.print(targetId);
//check the id. If it is not existing already then return true else false
UserOp userOp=new UserOp();
if ((targetId != null) && !userOp.containsKey(targetId.trim())) {
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
response.getWriter().write("<valid>true</valid>");
} else {
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
response.getWriter().write("<valid>false</valid>");
}
}
/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}