An introduction to web programming with Java

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Felix Cummings
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1 Chapter 1 An introduction to web programming with Java Objectives Knowledge

2 Objectives (continued) The first page of a shopping cart application

3 The second page of a shopping cart application Components of a web application Client computer Server computer Internet connection Web browser Web server Database server

4 The components of a web application How a web server processes static web pages Client Server HTTP request Browser Web server HTML file HTTP response

5 How static web pages work How a web server processes dynamic web pages Client Server Browser HTTP request HTTP response Web server Web application

6 How dynamic web pages work The components of a Java web application Client Browser HTTP request HTTP response Server Web server Servlet/JSP engine Java Development Kit (JDK) Database server

7 Components needed for Java web application A JSP that displays three parameters entered by the user

8 An introduction to JavaServer Pages The code for the JSP <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" " <html> <head> <title>murach's Java Servlets and JSP</title> </head> <body> <% // get parameters from the request String firstname = request.getparameter("firstname"); String lastname = request.getparameter("lastname"); String address = request.getparameter(" address"); %> <h1>thanks for joining our list</h1>

9 The code for the JSP (continued) <p>here is the information that you entered:</p> <table cellspacing="5" cellpadding="5" border="1"> <tr> <td align="right">first name:</td> <td><%= firstname %></td> </tr> <tr> <td align="right">last name:</td> <td><%= lastname %></td> </tr> <tr> <td align="right"> address:</td> <td><%= address %></td> </tr> </table> The code for the JSP (continued) <p>to enter another address, click on the Back <br> button in your browser or the Return button shown <br> below.</p> </body> </html> <form action="join_ _list.html" method="get"> <input type="submit" value="return"> </form>

10 Code for a servlet that works the same as the JSP package ; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class Display ListServlet extends HttpServlet { protected void doget( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // get parameters from the request String firstname = request.getparameter("firstname"); String lastname = request.getparameter("lastname"); String address = request.getparameter(" address"); Code for the servlet (continued) // return response to browser response.setcontenttype("text/html;charset=utf-8"); PrintWriter out = response.getwriter(); out.println( "<!doctype html public \" + "-//W3C//DTD HTML 4.0 Transitional//EN\">\n"" + "<html>\n" + "<head>\n" + " <title>murach's Java Servlets and JSP</title>\n" + "</head>\n" + "<body>\n" + "<h1>thanks for joining our list</h1>\n" + "<p>here is the information that you entered:</p>\n" + " <table cellspacing=\"5\" cellpadding=\"5\" " + "border=\"1\">\n" + " <tr><td align=\"right\">first name:</td>\n" + " <td>" + firstname + "</td>\n" + " </tr>\n" + " <tr><td align=\"right\">last name:</td>\n" + " <td>" + lastname + "</td>\n" + " </tr>\n" + " <tr><td align=\"right\"> address:</td>\n" + " <td>" + address + "</td>\n" + " </tr>\n"

11 Code for the servlet (continued) } } + " </table>\n" + "<p>to enter another address, click on the Back <br>\n" + "button in your browser or the Return button shown <br>\n" + "below.</p>\n" + "<form action=\"join_ _list.html\" >\n" + " <input type=\"submit\" value=\"return\">\n" + "</form>\n" + "</body>\n" + "</html>\n"); out.close(); Three environments for servlet and JSP development Stand-alone development JDK Tomcat MySQL Local Area Network development JDK Java EE JAR files LAN connection JDK Tomcat MySQL Client Server Internet development Client JDK Java EE JAR files Internet connection Server JDK Tomcat Apache MySQL

12 The architecture for a typical Java web application Presentation layer HTML files JSP files Business rules layer Servlets JavaBeans Other Java classes Data access layer Data access classes Database Text files Binary files XML files The architecture for a typical Java web application (continued)

13 The NetBeans IDE Popular IDEs for Java web development Description

14 An ISP that provides web hosting that supports servlets and JSPs The FileZilla program

2. Follow the installation directions and install the server on ccc

2. Follow the installation directions and install the server on ccc Installing a Web Server 1. Install a sample web server, which supports Servlets/JSPs. A light weight web server is Apache Tomcat server. You can get the server from http://tomcat.apache.org/ 2. Follow