Sul mio manuale si sono presentati 2 metodi quasi identici ma non si è detta la cosa più importante ovvero la differenza tra i 2 esempi in termini informatici e non si è neppure detto quale sia tra i due il metodo più conveniente/funzionale. Sapreste aiutarmi voi?
codice:listing 4 <html> <body> <center> <form name="Form1" action="http://localhost:8080/examples/servlets/servlet/ColorGetServlet"> <B>Color:</B> <select name="color" size="1"> <option value="Red">Red</option> <option value="Green">Green</option> <option value="Blue">Blue</option> </select> <br><br> <input type=submit value="Submit"> </form> </body> </html> listing 5 import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class ColorGetServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String color = request.getParameter("color"); response.setContentType("text/html"); PrintWriter pw = response.getWriter(); pw.println("<B>The selected color is: "); pw.println(color); pw.close(); } } listing 6 <html> <body> <center> <form name="Form1" method="post" action="http://localhost:8080/examples/servlets/servlet/ColorPostServlet"> <B>Color:</B> <select name="color" size="1"> <option value="Red">Red</option> <option value="Green">Green</option> <option value="Blue">Blue</option> </select> <br><br> <input type=submit value="Submit"> </form> </body> </html> listing 7 import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class ColorPostServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String color = request.getParameter("color"); response.setContentType("text/html"); PrintWriter pw = response.getWriter(); pw.println("<B>The selected color is: "); pw.println(color); pw.close(); } }
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