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CIS 3952 [Part 2] Java Servlets and JSP tutorial Java Servlets Example 1 (Plain Servlet) SERVLET CODE import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet(name = "Servlet1", urlPatterns = {"/Servlet1"}) public class Servlet1 extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>My first servlet</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Welcome to Servlets!</h1>"); out.println("</body>"); out.println("</html>"); out.close(); } } Matthew Xuereb © 2012/2013 Page 1 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial HTML PAGE CODE <html> <head> <title>An HTML page to invoke the welcome Servlet</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <form action="Servlet1" method="get"> <label> Click on the button to invoke the servlet</label> <input type="submit" value="CLICK HERE"/> </form> </body> </html> Matthew Xuereb © 2012/2013 Page 2 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial Example 2 (Servlet with form data using GET) SERVLET CODE import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet(name = "Servlet2", urlPatterns = {"/Servlet2"}) public class Servlet2 extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>My second servlet</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Extracting data using get request</h1>"); // Get String String String the data name = request.getParameter("name"); surname = request.getParameter("surname"); age = request.getParameter("age"); out.println("Hello " + name + " " + surname + "!<br/>"); try{ int ageInt = Integer.parseInt(age); Matthew Xuereb © 2012/2013 Page 3 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial if(ageInt < 18){ out.println("You cannot drive"); }else{ out.println("You can drive"); } }catch(Exception e){ // Do nothing } out.println("</body>"); out.println("</html>"); out.close(); } } HTML PAGE CODE <html> <head> <title>An HTML page to invoke the Servlet using a get</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <h1>Fill in the following form</h1> <form action="Servlet2" method="get"> <label>NAME: </label> <input type="text" name="name"/> <br/> <br/> <label>SURNAME: </label> <input type="text" name="surname"/> <br/><br/> <label>AGE: </label> <input type="text" name="age"/> <br/><br/> <input type="submit" value="Submit"/> </form> </body> </html> Matthew Xuereb © 2012/2013 Page 4 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial http://localhost:8084/MyWebAplication/Servlet2?name=Matthew&surname=Xuereb&age=26 Matthew Xuereb © 2012/2013 Page 5 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial Example 3 (Servlet with form data using POST) SERVLET CODE import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet(name = "Servlet3", urlPatterns = {"/Servlet3"}) public class Servlet3 extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>My second servlet</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Extracting data using get request</h1>"); // Get String String String the data name = request.getParameter("name"); surname = request.getParameter("surname"); age = request.getParameter("age"); out.println("Hello " + name + " " + surname + "!<br/>"); try{ int ageInt = Integer.parseInt(age); Matthew Xuereb © 2012/2013 Page 6 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial if(ageInt < 18){ out.println("You cannot drive"); }else{ out.println("You can drive"); } }catch(Exception e){ // Do nothing } out.println("</body>"); out.println("</html>"); out.close(); } } HTML PAGE CODE <html> <head> <title>An HTML page to invoke the Servlet using a post</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <h1>Fill in the following form</h1> <form action="Servlet3" method="post"> <label>NAME: </label> <input type="text" name="name"/> <br/> <br/> <label>SURNAME: </label> <input type="text" name="surname"/> <br/><br/> <label>AGE: </label> <input type="text" name="age"/> <br/><br/> <input type="submit" value="Submit"/> </form> </body> </html> Matthew Xuereb © 2012/2013 Page 7 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial http://localhost:8084/MyWebAplication/Servlet3 Matthew Xuereb © 2012/2013 Page 8 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial Java Server Pages (JSP) Example 1 JSP Code <%@page import="java.text.SimpleDateFormat"%> <%@page import="java.util.Date" %> <html> <head> <title>JSP Page showing the current date and time</title> </head> <body> <h1>Date and time</h1> Current time: <%= new Date() %> <br/><br/> Date only: <% Date now = new Date(); String fullDateAndTime = now.toString(); SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy"); out.println(dateFormat.format(now)); %> </body> </html> Matthew Xuereb © 2012/2013 Page 9 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial Generated HTML code <html> <head> <title>JSP Page showing the current date and time</title> </head> <body> <h1>Date and time</h1> Current time: Fri Aug 17 11:40:31 CEST 2012 <br/><br/> Date only: 17/08/2012 </body> </html> Matthew Xuereb © 2012/2013 Page 10 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial Example 2 HTML Code <html> <head> <title>An HTML page to invoke a JSP page</title> </head> <body> <h1>Times table</h1> <form action="TimesTable.jsp" method="get"> <label>Enter a number to display it's times table: </label> <input type="text" name="num"/> <br/><br/> <input type="submit" value="Submit"/> </form> </body> </html> Matthew Xuereb © 2012/2013 Page 11 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial JSP Code <html> <head> <title>JSP Page showing the times table</title> </head> <body> <%! int num = 1; %> <% String sNum = request.getParameter("num"); try{ num = Integer.parseInt(sNum); }catch(Exception e){ // Do nothing } %> <h1>The <%=num%> times table</h1> <% for(int i = 1;i <= 10;i++){ out.println("<br/>" + num + " x " + i + " = " + num*i); } %> </body> </html> Matthew Xuereb © 2012/2013 Page 12 of 13 CIS 3952 [Part 2] Java Servlets and JSP tutorial Generated HTML code <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page showing the times table</title> </head> <body> <h1>The 5 times table</h1> <br/>5 x 1 = 5 <br/>5 x 2 = 10 <br/>5 x 3 = 15 <br/>5 x 4 = 20 <br/>5 x 5 = 25 <br/>5 x 6 = 30 <br/>5 x 7 = 35 <br/>5 x 8 = 40 <br/>5 x 9 = 45 <br/>5 x 10 = 50 </body> </html> Matthew Xuereb © 2012/2013 Page 13 of 13