Java Slips

How to Run JSP Page

Go to your Tomcat installation directory
Navigate to the webapps/ folder
Create a new folder for your project (e.g., MyApp)
Place your JSP file (e.g., index.jsp) inside webapps/MyApp/
Start the Tomcat server using startup.bat (Windows) or startup.sh (Linux/Mac)
Open your browser and visit: http://localhost:8080/MyApp/index.jsp

How to Run a Java Applet

Ensure you have JDK 8 installed with appletviewer available in your system PATH
Write a Java applet by extending the Applet class and overriding the paint() method
Save the file with a .java extension (e.g., HelloApplet.java)
Compile the applet using:
javac HelloApplet.java

Create an HTML file to load the applet, for example:


                        <html>
                          <body>
                            <applet code="HelloApplet.class" width="300" height="100"></applet>
                          </body>
                        </html>

Save the HTML file in the same folder as the .class file
Run the applet using:
appletviewer HelloApplet.html
Note: Applets are no longer supported in browsers. Use appletviewer from JDK 8 only

How to Run Servlet Program

Make sure Apache Tomcat is installed on your system
Create a Java file (e.g., MyServlet.java) that extends HttpServlet
Override doGet(HttpServletRequest req, HttpServletResponse res) or doPost() method

Example code:


                import java.io.*;
                import javax.servlet.*;
                import javax.servlet.http.*;
                
                public class MyServlet extends HttpServlet {
                    protected void doGet(HttpServletRequest request, HttpServletResponse response)
                            throws ServletException, IOException {
                        response.setContentType("text/html");
                        PrintWriter out = response.getWriter();
                        out.println("<h1>Hello from Servlet</h1>");
                    }
                }

Compile the servlet using:
javac -cp path/to/servlet-api.jar MyServlet.java
Tip: servlet-api.jar is located in Tomcat/lib/ folder
Create folder structure inside Tomcat/webapps/YourApp/ like this:
- YourApp/WEB-INF/classes/ → place the compiled MyServlet.class here
- YourApp/WEB-INF/web.xml → for servlet configuration

Create web.xml like this:


                <web-app>
                  <servlet>
                    <servlet-name>MyServlet</servlet-name>
                    <servlet-class>MyServlet</servlet-class>
                  </servlet>
                  <servlet-mapping>
                    <servlet-name>MyServlet</servlet-name>
                    <url-pattern>/hello</url-pattern>
                  </servlet-mapping>
                </web-app>

Start the Tomcat server by running startup.bat (Windows) or startup.sh (Linux/Mac)
Open your browser and visit:
http://localhost:8080/YourApp/hello
Your servlet should respond with “Hello from Servlet” in the browser

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