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***admin*** · 11-28-2011, 06:30 PM

•Servlets are Java programming language objects that dynamically process requests and construct responses.Here you are going to learn Servlet example for printing random values with Explanation, First write one serlvet program
[java]
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class colorservlet extends HttpServlet
{
public void doGet(HttpServletRequest
request,HttpServletResponse response)throws ServletException,IOException
{
String color=request.getParameter(”color”);
response.setContentType(”text/html”);
PrintWriter pw=response.getWriter();
pw.println(”
<div>
<div><strong>The selected color is:”);
pw.println(color);
pw.close();
}
}
[/java]
Step1:
To run servlet You need to compile it first for that you need any of the Jar files given below
1.servlet-api.jar (included in tomcat/lib) Download Tomcat
or
2.Jsdk.jar(included in jsdk2.0 or later)Download from sun site
After downloading installed it and give classpath for example if you are installing it in the c:/tomcat 5.5/”
then you had to assign classpath as
set classpath=c:/tomcat5.5/common/lib/servlet-api.jar;and now compile your program asusual like javac
colorservlet.java.
Step2:
To run serlvet you need to create a web.xml file
sample web.xml file for helloworld
[xml]
<web-app>
<servlet>
<servlet-name>colorservlet</servlet-name>
<servlet-class>colorservlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>colorservlet</servlet-name>
<url-pattern>/colorservlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>colorservlet.html</welcome-file>
</welcome-file-list>
</web-app>
[/xml]
Now create colorservlet.html
[css htmlscript="true"]
<html>
<body>
<center>
<form name=”form1″ method=”get”
action=”colorservlet”>
<b>Color:</b>
<select name=”color” size=”1″>
<option value=”red”>Red</option>
<option value=”green”>Green</option>
<option value=”yellow”>Yellow</option>
</select>
<br><br>
<input type=submit value=”submit”>
</form>
</body>
</html>
[/css]
Your folder structure will look below
colorservlet folder(inside webapps of tomcat installation folder)inside coloservlet folder it look like below.

=>WEB-INF=>classes=>class files of servlet

=>lib(jar files servlet-api.jar)

=>web.xml

=>colorservlet.html

Step3 :

goto
http://localhost:8080/colorservlet/
and run the program

Happy coding

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