JSP,DB,SERVLET

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ramyajayaraman

JSP,DB,SERVLET
2 Answer(s) 2 years and 5 months ago
Posted in : JSP-Servlet

I have a jsp page called page1.jsp with 3 text fields name,phone ,city.i populated these datas into a database table through servlet (page1servlet.java) and bean(page1bean.java).I have another jsp page(display.jsp) with 4 fields name, city ,phone.Once the user enter the name, city and phone should be automatically populated from database through servlet(SetDetailsServlet.java)..I did till connecting and populating datas in datbase bt I could not populate the datas automatically from databse in jsp on entering name ...can u help me????????

My codes**

these are my codes.....

Page1.jsp

<%@ page import="java.sql.*" %> <%@ page import="java.io.*" %>

<HTML> <HEAD> <TITLE>insert data using prepared statement

<BODY bgcolor="#ffffcc">
loginform!

  <TR>
      <TH width="50%">Name</TH>
      <TD width="50%"><INPUT TYPE="text" NAME="name"></TD>
  </tr>
  <TR>
     <TH width="50%">City</TH>
     <TD width="50%"><INPUT TYPE="text" NAME="city"></TD>
  </tr>
  <TR>
     <TH width="50%">Phone</TH>
     <TD width="50%"><INPUT TYPE="text" NAME="phone"></TD>
  </tr>


  <TR>
      <TH></TH>
      <TD width="50%"><INPUT TYPE="submit" VALUE="submit"></TD>
  </tr>

Page1Bean.java

public class Page1bean { private String name; private String city; private String phone; /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub

}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getCity() {
    return city;
}
public void setCity(String city) {
    this.city = city;
}
public String getPhone() {
    return phone;
}
public void setPhone(String phone) {
    this.phone = phone;
}

}

Page1servlet.java

import java.io.IOException;

import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;

import newpack.DBOperation;

/** * Servlet implementation class page1servlet */ public class page1servlet extends HttpServlet { private static final long serialVersionUID = 1L;

/**
 * @see HttpServlet#HttpServlet()
 */
public page1servlet() {
    super();
    // TODO Auto-generated constructor stub
}

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException
{
    RequestDispatcher rd = null;
    String sname,scity,sphone,check=null;

    sname = request.getParameter("name");
    scity = request.getParameter("city");
    sphone= request.getParameter("phone");


    try 
    {
        //System.out.println(firstName);
        DBOperation objDB = new DBOperation();
        check = objDB.savestuinfo(sname,scity,sphone);
        System.out.println(check);
        if(check == "")
        {
            HttpSession s=request.getSession(true);
            s.setAttribute("name", sname);
            s.setAttribute("city", scity);
            s.setAttribute("phone", sphone);

            rd = request.getRequestDispatcher("display.jsp");
        }
        else
        {

            rd = request.getRequestDispatcher("Error.jsp");
        }
    } 
    catch (Exception e) 
    {
        request.setAttribute("Error", e.getMessage());
        rd = request.getRequestDispatcher("Error1.jsp");
    }

    rd.forward(request, response);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

}

DbConnection.java

import java.sql.DriverManager;

import com.mysql.jdbc.Connection;

public class DBConnection {

    public static Connection getDBConnection()throws ClassNotFoundException,Exception
    {
        Connection con = null;

        try 
        {
            Class.forName("com.mysql.jdbc.Driver");
            con = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","root");    
        }
        catch (ClassNotFoundException e) 
        {
            throw e;
        }
        catch (Exception e)
        {
            throw e;
        }

        return con;
    }
}

DbOperation.java

import java.sql.Connection; import java.sql.SQLException; import java.sql.Statement;

import newpack.DBConnection;

import com.mysql.jdbc.CallableStatement; import com.mysql.jdbc.PreparedStatement; import com.mysql.jdbc.ResultSet;

public class DBOperation { Connection con; Statement stmt;

public String savestuinfo (String sname, String  scity, String sphone)
{
    String sMsg = "";

    try 
    {

        con = DBConnection.getDBConnection();
        PreparedStatement pstmt = (PreparedStatement) con.prepareStatement("INSERT INTO student(name,city,phone) VALUES(?,?,?)");

        pstmt.setString(1, sname);
        pstmt.setString(2, scity);
        pstmt.setString(3, sphone);


        if(pstmt.execute() == true)
        {
                sMsg = "ERROR";
        }
        pstmt.close();
    } 
    catch (SQLException e) 
    {
        sMsg = "ERROR" + e.getMessage();
        e.printStackTrace();
    }
    catch (Exception e)
    {
        sMsg = "ERROR" + e.getMessage();
        e.printStackTrace();
    }
    finally
    {
        try 
        {
            con.close();
        }
        catch (Exception e2) 
        {}
    }

    return sMsg;
}
public String getuserdetails(String sname, String scity,String sphone)throws SQLException, ClassNotFoundException, Exception
{


    String sQuery = "SELECT s.city,s.phone FROM stu_info s WHERE name = '"+sname+"'";
    Connection con = null;
    try 
    {
        con = DBConnection.getDBConnection();
        stmt = (Statement)con.createStatement();

        ResultSet rs = (ResultSet) stmt.executeQuery(sQuery);

        if(rs.next())
        {
        scity = rs.getString("city");
        sphone=rs.getString("phone");
        }
        else
        {
        scity = "";
        sphone="";
        }
    } 
    catch (Exception e)
    {
        throw e;
    }
    finally
    {
        con.close();
    }
    return sQuery;


}

}

display.jsp

Insert title here

Name Inserted	<%=session.getAttribute("name")%>
Name
City
Phone

GetDetailServlet.java

import java.io.IOException;

import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;

/** * Servlet implementation class for Servlet: GetDetailServlet * */ public class GetDetailServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { static final long serialVersionUID = 1L;

/* (non-Java-doc)
 * @see javax.servlet.http.HttpServlet#HttpServlet()
 */
public GetDetailServlet() {
    super();
}       

/* (non-Java-doc)
 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
}   

/* (non-Java-doc)
 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    RequestDispatcher rd = null;
    String sname,scity,sphone,check=null;

    sname = request.getParameter("name");
    scity = request.getParameter("city");
    sphone= request.getParameter("phone");


    try 
    {
        //System.out.println(firstName);
        DBOperation objDB = new DBOperation();
        check = objDB.savestuinfo(sname,scity,sphone);
        if(check == "")
        {
            HttpSession s=request.getSession(true);
            s.setAttribute("name", sname);
            s.setAttribute("city", scity);
            s.setAttribute("phone", sphone);

            rd = request.getRequestDispatcher("Success.jsp");
        }
        else
        {

            rd = request.getRequestDispatcher("Error.jsp");
        }
    } 
    catch (Exception e) 
    {
        request.setAttribute("Error", e.getMessage());
        rd = request.getRequestDispatcher("Error.jsp");
    }

}

}

Success.jsp

Insert title here Success in Connection

View Answers

December 10, 2010 at 5:15 PM

Hi Friend,

We are sending you the simple code. Try it. 1)insert.jsp:

<html>
<form method="post" action="../InsertServlet">
<table>
<tr><td>Name:</td><td><input type="text" name="name"></td></tr>
<tr><td>Age:</td><td><input type="text" name="age"></td></tr>
<tr><td>City:</td><td><input type="text" name="city"></td></tr>
<tr><td></td><td><input type="submit" value="Submit"></td></tr>
</table>
</form>
</html>

2)InsertServlet.java:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

public class InsertServlet extends HttpServlet { 
    public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException {
        res.setContentType("text/html");
        PrintWriter out = res.getWriter();
        String name=req.getParameter("name");
int age=Integer.parseInt(req.getParameter("age"));
String city=req.getParameter("city");
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
           Connection con = DriverManager.getConnection("jdbc:odbc:student");
           Statement st=con.createStatement();
           int i=st.executeUpdate("insert into data(name,age, city) values('"+name+"',"+age+",'"+city+"')");
         con.close();
         res.sendRedirect("/examples/jsp/ajax.jsp");

}
catch(Exception e){
    System.out.println(e);
}
            }
        }

3)ajax.jsp:

<%@page import="java.sql.*"%>
<html>
<head>
<script type="text/javascript">
function showData(value){ 
xmlHttp=GetXmlHttpObject()
var url="../AjaxServlet"
url=url+"?name="+value
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
function stateChanged() { 
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
    var showdata = xmlHttp.responseText; 
    var strar = showdata.split(":");
    document.getElementById("age").value= strar[1];
    document.getElementById("city").value= strar[2];

 } 
}
function GetXmlHttpObject(){
var xmlHttp=null;
try {
  xmlHttp=new XMLHttpRequest();
 }
catch (e) {
 try  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}
</script>
</head>
<body>
<form name="employee">
<br><br>
<table border="0" width="400px" align="center" bgcolor="#CDFFFF">
<div id="mydiv"></div>
   <tr><td><b>Name:</b></td><td> 
 <input  type="text" name="name" id="name" onkeyup="showData(this.value);"></td></tr>
<tr><td ><b>Age:</b></td><td>
<input  type="text" name="age" id="age" ></td></tr>
<tr><td><b>City:</b></td><td>
<input  type="text" name="city" id="city" ></td></tr>
<tr><td><b>Phone No:</b></td><td>
<input  type="text" name="phoneno" id="phoneno"></td></tr>

</table>
</form>    
<table border="0" width="100%" align="center">
<br>
<br>
</table>
</body>
</html>

December 10, 2010 at 5:16 PM

continue..

4)AjaxServlet.java:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

public class AjaxServlet extends HttpServlet { 
    public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException {
        res.setContentType("text/html");
        PrintWriter out = res.getWriter();
        String name = req.getParameter("name").toString();
        System.out.println(name);
String data ="";
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
           Connection con = DriverManager.getConnection("jdbc:odbc:student");
           Statement st=con.createStatement();
           ResultSet rs=st.executeQuery("select * from data where name='"+name+"'");
while(rs.next())
{
data =":"+Integer.toString(rs.getInt("age")) + ":" + rs.getString("city");
}


out.println(data);
System.out.println(data);
}
catch (Exception e) {
System.out.println(e);
}
        }
        }

Thanks

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