Servlet/JSP course chapter 1: Introduction to servlets

Chaper 1 Servlets / JSP Course Introduction to servlets

Servlet / JSP course topics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction to servlets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What Is a Servlet? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Servlet Life Cycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exercise 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exercise 1 Results ,[object Object]

Exercise 1 Results ,[object Object],< form action = " addToEmailList " method = "post" > < table cellspacing = "5" border = "0" > < tr > < td align = "right" > First name: </ td > < td >< input type = "text" name = "firstName" ></ td > </ tr > < tr > < td align = "right" > Last name: </ td > < td >< input type = "text" name = "lastName" ></ td > </ tr > < tr > < td align = "right" > Email address: </ td > < td >< input type = "text" name = "emailAddress" ></ td > </ tr > < tr > < td ></ td > < td >< br >< input type = "submit" value = "Submit" ></ td > </ tr > </ table > </ form > The servlet mapped In the web.xml

Exercise 1 Results ,[object Object],. . . protected void doPost( HttpServletRequest request , HttpServletResponse response ) throws ServletException, IOException { // get parameters from the request String firstName = request .getParameter( "firstName" ); String lastName = request .getParameter( "lastName" ); String emailAddress = request .getParameter( "emailAddress" ); // get a relative file name ServletContext sc = getServletContext(); String path = sc.getRealPath( "/WEB-INF/EmailList.txt" ); // use regular Java objects to write the data to a file User user = new User(firstName, lastName, emailAddress); UserIO. add (user, path); . . . The request & Response objects

Exercise 1 Results ,[object Object],. . . // send response to browser response.setContentType( "text/html;charset=UTF-8" ); PrintWriter out = response.getWriter(); out.println( . . . + " <table cellspacing=amp;quot;5amp;quot; cellpadding=amp;quot;5amp;quot; border=amp;quot;1amp;quot;>" + " <tr><td align=amp;quot;rightamp;quot;>First name:</td>" + " <td>" + firstName + "</td>" + " </tr>" + " <tr><td align=amp;quot;rightamp;quot;>Last name:</td>" + " <td>" + lastName + "</td>" + " </tr>" + " <tr><td align=amp;quot;rightamp;quot;>Email address:</td>" + " <td>" + emailAddress + "</td>" + " </tr>" + " </table>" . . . out.close(); . . . The Response to The web client

Methods provided by ServletRequest for retrieving client-sent parameters

Life-cycle Servlet Methods ,[object Object],[object Object],[object Object]

Example of Life-cycle Servlet Methods ,[object Object],. . . public class AddToEmailListServlet2 extends HttpServlet { // declare an instance variable for the page int globalCount ; // instance variables are not thread-safe public void init () throws ServletException { globalCount = 0; // initialize the instance variable } protected void doPost( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // update global count variable globalCount ++; // this is not thread-safe . . .

Resources To download example code for this chapter go to: http://www.jeetrainers.com

Servlet/JSP course chapter 1: Introduction to servlets

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