package com.mydev; import java.io.IOException; import java.io.PRintWriter; import java.util.Enumeration; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; //必須繼承HttpServlet接口 public class FirstServlet extends HttpServlet ...{ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException ...{ //set the MIME type of the response, "text/html" response.setContentType("text/html"); //use a PrintWriter to send text data to the client who has requested the //servlet java.io.PrintWriter out = response.getWriter( ); //Begin assembling the HTML content out.println("<html><head>"); out.println("<title>Help Page</title></head><body>"); out.println("<h2>Please submit your information</h2>"); //make sure method="post" so that the servlet service method //calls doPost in the response to this form submit out.println( "<form method="post" action ="" + request.getContextPath( ) + "/firstservlet" >"); out.println("<table border="0"><tr><td valign="top">"); out.println("Your first name: </td> <td valign="top">"); out.println("<input type="text" name="firstname" size="20">"); out.println("</td></tr><tr><td valign="top">"); out.println("Your last name: </td> <td valign="top">"); out.println("<input type="text" name="lastname" size="20">"); out.println("</td></tr><tr><td valign="top">"); out.println("Your email: </td> <td valign="top">"); out.println("<input type="text" name="email" size="20">"); out.println("</td></tr><tr><td valign="top">"); out.println("<input type="submit" value="Submit Info"></td></tr>"); out.println("</table></form>"); out.println("</body></html>"); } //doGet public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException ...{ //display the parameter names and values Enumeration paramNames = request.getParameterNames( ); String parName; //this will hold the name of the parameter boolean emptyEnum = false; if (! paramNames.hasMoreElements( )) emptyEnum = true; //set the MIME type of the response, "text/html" response.setContentType("text/html"); //use a PrintWriter to send text data to the client java.io.PrintWriter out = response.getWriter( ); //Begin assembling the HTML content out.println("<html><head>"); out.println("<title>Submitted Parameters</title></head><body>"); if (emptyEnum) ...{ out.println( "<h2>Sorry, the request does not contain any parameters</h2>"); } else ...{ out.println( "<h2>Here are the submitted parameter values</h2>"); } while(paramNames.hasMoreElements( )) ...{ parName = (String) paramNames.nextElement( ); out.println( "<strong>" + parName + "</strong> : " + request.getParameter(parName)); out.println("<br />"); }//while out.println("</body></html>"); } // doPost }
