Java tutorial
/* functions.js <script language="JavaScript"> function CheckEmail(email) { var firstchunk,indx,secondchunk if (email == ""){ alert("Please make sure you have entered a valid email before submitting the info.") return false } //get the zero-based index of the "@" character indx = email.indexOf("@") //if the string does not contain an @ then then return true if (indx == -1 ){ alert("Please make sure you have entered a valid email before submitting the info.") return false } //if the first part of email is < 2 chars and second part < 7 chars //(arbitrary but workable criteria) then reject the input address firstchunk = email.substr(0,indx) //up to but not including the "@" //start at char following the "@" and include up to end of email addr secondchunk = email.substr(indx + 1) //if the part following the "@" does not include a period "." then //also return false if ((firstchunk.length < 2 ) || (secondchunk.length < 7) || (secondchunk.indexOf(".") == -1)){ alert("Please make sure you have entered a valid email before submitting the info.") return false } //the email was okay; at least it had a @, more than 1 username chars, //more than 6 chars after the "@", and the substring after the "@" // contained a "." char return true } function CreateWindow(uri) { var newWin = window.open(uri,'newwin1','width=500,height=400,resizable,scrollable,scrollbars=yes'); newWin.focus(); } </script> */ import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ModuleServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException { response.setContentType("text/html"); java.io.PrintWriter out = response.getWriter(); out.println("<html><head>"); RequestDispatcher dispatcher = request.getRequestDispatcher("/WEB-INF/functions.js"); dispatcher.include(request, response); out.println("<title>Client Forms</title></head><body>"); out.println("<h2>Enter Your Name and Email</h2>"); out.println( "<form action=\"/home/displayHeaders.jsp\" name=\"entryForm\" onSubmit=\" return CheckEmail(this.email.value)\">"); out.println("<table border=\"0\"><tr><td valign=\"top\">"); out.println( "First and last name: </td> <td valign=\"top\"><input type=\"text\" name=\"name\" size=\"20\"></td></tr>"); out.println("<tr><td valign=\"top\">"); out.println("Email: </td> <td valign=\"top\"><input type=\"text\" name=\"email\" size=\"20\"></td>"); out.println("<tr><td valign=\"top\"><input type=\"submit\" value=\"Submit\" ></td>"); out.println("</tr></table></form>"); out.println("</body></html>"); } //end doGet }