Introduction
In this article you will make an application(RetrieveServletData) to retrieve all the data from an HTML page and then display the data in the browser. For this Application we create
- Servlet(ParameterServlet.java)
- HTML page(Form.html)
- An XML file(web.xml)
Step 1:
Create a servlet, for example ParameterServlet.java
package
My;
import
java.io.IOException;
import
java.io.PrintWriter;
import
java.util.Enumeration;
import
javax.servlet.ServletException;
import
javax.servlet.http.HttpServlet;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
public
class
ParameterServlet
extends
HttpServlet
{
private
static
final
long
serialVersionUID
= 1L;
public
ParameterServlet()
{
super();
}
protected
void
doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException
{
doGet(request, response);
}
protected
void
doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException
{
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("<html><head>");
out.println("<title>Servlet
Parameter</title>");
out.println("</head>");
out.println("<body>");
Enumeration parameters = request.getParameterNames();
String param=null;
while
(parameters.hasMoreElements())
{
param=(String)parameters.nextElement();
out.println(param + ":"
+ request.getParameter(param) + "<br>"
);
}
out.println("</body></html>");
out.close();
}
}
Step 2:
Create
a
HTML page for example Form.html
<!DOCTYPE
html PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta
http-equiv="Content-Type"
content="text/html;
charset=ISO-8859-1">
<title>Parameter
Servlet Form</title>
</head>
<body>
<form
action="parameter"
method=Post>
<table
width="400"
border="0"
cellspacing="0">
<tr>
<td>Name:</td>
<td>
<input
type="text"
name="name"
size="20"
maxlength="20">
</td>
<td>SSN:</td>
<td>
<input
type="text"
name="ssn"
size="11"
maxlength="11">
</td>
</tr>
<tr>
<td>Age:</td>
<td>
<input
type="text"
name="age"
size="3"
maxlength="3">
</td>
<td>email:</td>
<td>
<input
type="text"
name="email"
size="30"
maxlength="30">
</td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td>
<input
type="submit"
name="submit"
>
<input
type="reset"
name="reset"
>
</td>
</tr>
</table>
</form>
</body>
</html>
Step 3:
Create
a web.xml file if u use Eclipse IDE by default created by IDE.
<?xml
version="1.0"
encoding="UTF-8"?>
<web-app
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID"
version="2.5">
<servlet>
<servlet-name>ParameterServlet</servlet-name>
<servlet-class>My.ParameterServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ParameterServlet</servlet-name>
<url-pattern>/parameter</url-pattern>
</servlet-mapping>
</web-app>
Step 4: Rigth
Click on Project or application ->
Run As -> Run on Server.
![RunRetrieveServlet]()
Step 5: Browser is open
and at the end of URL enter the Form.html for example
http://localhost:9999/RetriveServletData/Form.html Enter all the
information in text boxes and click on submit Query button.
![OpenBrowser]()
After click on submit query
button you see the url is changed
http://localhost:9999/RetriveServletData/parameter that is this page is
redirect to the given url pattern in web.xml file.
![url]()
And the output of this application is given below.
![outputof-RetrieveServlet]()