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Servlet LAB
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Ø Eclipse IDE (2020) JEE
Ø
Copy
: C:\xampp\tomcat\lib\servlet-api.jar
Ø
Copy
: C:\xampp\tomcat\lib\jsp-api.jar
Ø
Paste: lib\ext\servlet-api.jar
Ø
Paste: lib\ext\jsp-api.jar
Creating servlet example in eclipse ide, saves a lot of work to be done. It is easy and simple to create a servlet example. Let's see the steps, you need to follow to create the first servlet example.
- Create
a Dynamic web project
- create
a servlet
- add
servlet-api.jar file
- Run
the servlet
1) Create the dynamic web project:
For creating a dynamic
web project click on File Menu -> New -> Project..-> Web ->
dynamic web project -> write your project name e.g. first -> Finish.
2) Configure servlet-api.jar & jsp-api.jar Jar file in Eclipse IDE
Ø Right Click on Project (firstServlet)-> Build Path
-> Configure Build Path
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LAB
-1 . Reading Servlet Parameters
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Servlet Program to demonstrate Reading Servlet Parameters
// WebContent/PostParametersServlet.jsp
<html>
<head>
<meta charset="ISO-8859-1">
</head>
<body>
<form name="Form1"
method="post"
action="http://localhost:8080/firstServlet/PostParametersServlet">
<table>
<tr>
<td><B>Employee</td>
<td><input type=textbox name="e"
size="25" value=""></td>
</tr>
<tr>
<td><B>Phone</td>
<td><input type=textbox name="p"
size="25" value=""></td>
</tr>
</table>
<input type=submit value="Submit">
</form>
</body>
</html>
// src/PostParametersServlet.java
import java.io.*;
import java.util.*;
import javax.servlet.*;
public class PostParametersServlet
extends GenericServlet {
public void
service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
// Get print writer.
PrintWriter
pw = response.getWriter();
// Get enumeration of parameter
names.
Enumeration
e = request.getParameterNames();
// Display parameter names and
values.
while (e.hasMoreElements()) {
String
pname = (String) e.nextElement();
pw.print(pname + " = ");
String
pvalue = request.getParameter(pname);
pw.println(pvalue);
}
pw.close();
}
}
// WEB-INF/web.xml
<servlet>
<servlet-name>PostParametersServlet</servlet-name>
<servlet-class>PostParametersServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PostParametersServlet</servlet-name>
<url-pattern>/PostParametersServlet</url-pattern>
</servlet-mapping>
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LAB
-2 . Handling HTTP GET Requests
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Servlet Program to demonstrate Handling HTTP GET Requests
// WebContent/ColorGet.jsp
<html>
<body>
<center>
<form name="Form1"
action="http://localhost:8080/firstServlet/ColorGetServlet">
<B>Color:</B>
<select name="color" size="1">
<option value="Red">Red</option>
<option value="Green">Green</option>
<option value="Blue">Blue</option>
</select>
<br><br>
<input type=submit value="Submit">
</form>
</body>
</html>
// src/ ColorGetServlet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ColorGetServlet 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("<B>The selected color is: ");
pw.println(color);
pw.close();
}
}
// WEB-INF/web.xml
<servlet>
<servlet-name>ColorGetServlet</servlet-name>
<servlet-class>ColorGetServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ColorGetServlet</servlet-name>
<url-pattern>/ColorGetServlet</url-pattern>
</servlet-mapping>
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LAB
-3 . Handling HTTP POST Requests
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Servlet Program to demonstrate Handling HTTP POST Requests
// WEB-INF/web.xml
<servlet>
<servlet-name>ColorPostServlet</servlet-name>
<servlet-class>ColorPostServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ColorPostServlet</servlet-name>
<url-pattern>/ColorPostServlet</url-pattern>
</servlet-mapping>
// src/ColorPostServlet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ColorPostServlet extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String color = request.getParameter("color");
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<B>The selected color is: ");
pw.println(color);
pw.close();
}
}
// WebContent/ColorPost.jsp
<html>
<body>
<center>
<form name="Form1"
method="post"
action="http://localhost:8080/firstServlet/ColorPostServlet">
<B>Color:</B>
<select name="color" size="1">
<option value="Red">Red</option>
<option value="Green">Green</option>
<option value="Blue">Blue</option>
</select>
<br><br>
<input type=submit value="Submit">
</form>
</body>
</html>
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LAB
-4 . Using ADD Cookies
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Servlet Program to demonstrate AddCookie
// WebContent/AddCookie.html
<html>
<body>
<center>
<form name="Form1"
method="post"
action="http://localhost:8080/firstServlet/AddCookieServlet">
<B>Enter a value for MyCookie:</B>
<input type=textbox name="data"
size=25 value="">
<input type=submit value="Submit">
</form>
</body>
</html>
// src/AddCookieServlet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class AddCookieServlet extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get parameter from HTTP request.
String data = request.getParameter("data");
// Create cookie.
Cookie cookie = new Cookie("MyCookie", data);
// Add cookie to HTTP response.
response.addCookie(cookie);
// Write output to browser.
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<B>MyCookie has been set to");
pw.println(data);
pw.close();
}
}
// WEB-INF/web.xml
<servlet>
<servlet-name>AddCookieServlet</servlet-name>
<servlet-class>AddCookieServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AddCookieServlet</servlet-name>
<url-pattern>/AddCookieServlet</url-pattern>
</servlet-mapping>
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LAB
- 5 . Using GET Cookies
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Servlet Program to demonstrate GETCookie
// WEB-INF/web.xml
<servlet>
<servlet-name>GetCookiesServlet</servlet-name>
<servlet-class>GetCookiesServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GetCookiesServlet</servlet-name>
<url-pattern>/GetCookiesServlet</url-pattern>
</servlet-mapping>
// src/GetCookiesServlet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GetCookiesServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get cookies from header of HTTP
request.
Cookie[] cookies = request.getCookies();
// Display these cookies.
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<B>");
for(int i = 0; i < cookies.length; i++) {
String name = cookies[i].getName();
String value = cookies[i].getValue();
pw.println("name = " + name +
"; value = " + value);
}
pw.close();
}
}
Run in URL:
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LAB
- 6 . Using Session Tracking
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The following
servlet illustrates how to use session state:
That object is a Date
object that encapsulates the date and time when this page was last
accessed. A Date object encapsulating the current date and time is then
created. The setAttribute( ) method is called to bind the name
"date" to this object.
// src/DateServlet.java
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class DateServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Get the HttpSession object.
HttpSession hs = request.getSession(true);
// Get writer.
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.print("<B>");
// Display date/time of last access.
Date date = (Date)hs.getAttribute("date");
if(date != null) {
pw.print("Last access: " + date + "<br>");
}
// Display current date/time.
date = new Date();
hs.setAttribute("date", date);
pw.println("Current date: " + date);
}
}
Run
in browser:
http://localhost:8080/firstServlet/DateServlet
