Building Web Applications with JSP: Customizing Responses with Servlets

IN THIS COURSE

• 1.  Course Overview
  2m 19s
  Here, you’ll learn more about your instructor and this course. This course provides hands-on experience with customizing responses in your web application by means of HTTP servlets. You’ll learn to build a simple web page to accept user input in a form. Then, you’ll develop a servlet which can process the input supplied. You'll add complexity to your app by introducing multiple pages. FREE ACCESS
• 2.  Building a Java Servlet
  12m 19s
  Here, you’ll learn about servlets. A servlet, in a Java application, is a component that can handle an incoming HTTP request, process that request, generate a response, and then send that response back to the client, via the webserver. JSP applications are converted to servlets when deployed to Tomcat. Now, you’ll make use of servlets directly. This allows you to harness their full potential. FREE ACCESS
• 3.  Deploying and Testing a Servlet
  7m 54s
  In this demo, you’ll package your application and deploy it to Tomcat. You’ll head to index.jsp where you’ll confirm that your hyperlink points to the my-servlet URL. This is mapped to the MyServlet class. You’ll then pull up the Terminal. You’ll generate the WAR file for your app by running the mvn clean package. Once the WAR file has been generated, you’ll copy it and drop it into the webapps folder of Tomcat. FREE ACCESS
• 4.  Processing Inputs in a Servlet
  8m 50s
  Here, you’ll watch a demo on coding your servlet. You’ll start by importing IOException and PrintWriter from java.io. You’ll use the WebServlet annotation, which can be obtained from jakarta.servlet.annotation. You’ll now learn to process inputs in a servlet. FREE ACCESS
• 5.  Using the RequestDispatcher
  10m 9s
  In this demo, you’ll make use of a RequestDispatcher to partially process an incoming request in one servlet and then dispatch it to another servlet where more processing can be performed. While doing so, you’ll explore how the web.xml file can be used to map servlets to URL endpoints, and how these are analogous to a WebServlet annotation. FREE ACCESS
• 6.  Forwarding a Request from a Servlet to a JSP Page
  9m 12s
  In this demo, you’ll learn to forward a request from a servlet to a JSP page. You’ll change the application so that it uses the WebServlet annotation instead of the web.xml. You’ll need to head back over to the IDE and include a new import. You'll add in the WebServlet annotation and apply it to your servlet. You’ll add in the annotation just before the class definition and then set its urlPatterns property to "/bookinfo". FREE ACCESS
• 7.  Working with ServletConfig and ServletContext
  9m 18s
  In this demo, you’ll take a look at the ServletConfig and ServletContext objects available to HttpServlets. These are both useful when accessing servlet specific information. There’s a clear distinction between the two. A ServletConfig is servlet-specific, whereas the ServletContext has to do with the application as a whole. You’ll see how these can be accessed. You’ll also look at some of their properties. FREE ACCESS
• 8.  Setting Attributes at Different Scopes
  11m 7s
  In this demo, you’ll explore how to set attributes at various levels or various scopes within a JSP application. You’ll create and modify several files. Each of these files represents a different stage in a user's interaction with your website. You’ll go over each of these files in sequence, starting with index.jsp. This is defined within the webapp folder. This is where you’ll simulate a user sign-in form. FREE ACCESS
• 9.  Retrieving Attributes from Different Scopes
  7m 35s
  In this demo, you’ll retrieve attributes from different scopes. Onscreen, you’ll see this demo looks similar to the last. You’ll once again invoke getAttribute from the request level. Then, you’ll use the ServletContext when you call request.getServletContext. There’s a difference here, though. The original request object is no longer accessible since it has already been processed and has generated a response on the signinconfirm page. FREE ACCESS
• 10.  Course Summary
  2m 4s
  In this video, you’ll summarize what you’ve learned in this course. You’ve gained hands-on experience with Customizing Responses in your web application by means of HTTP Servlets. You saw how information can be extracted from request objects and then processed either within a servlet or over multiple servlets and JSPs. You built a simple web page to accept user input in a form and then developed a servlet that could process the input supplied. FREE ACCESS