Servlets :: Call Constructor / Method Upon Redirecting To Another Page?
Aug 13, 2014
I have login.jsp and home.jsp.
Each have its own servlets.
When I click Login button from login.jsp, it will navigate to home.jsp.
But before displaying home.jsp from he user, I want to call homeServlet.java's constructor/method.
This is because I want to populate a dropdown from home.jsp from a database.
I'm using MVC2 Servlet/JSP/Bean framework and AMAP, I do not want to execute javascripts/jquery for populating dropdowns.
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Sep 3, 2003
I want to call the HEAD method on a servlet.If in my HTML code, I specify -
<form name="testHead" action="/servlet/servletName" method="HEAD">
And the servlet handles the HEAD method in the sense that the doGet() method returns if the method type is HEAD.When I run it, the servlet returns the code returned by the entire doGet() method. This shows that the doGet() method does not realize that it is a HEAD method and it should return back without processing further.The application server is Tomcat 4.0.
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Mar 29, 2014
public Unit(String code, String name)
{
enrolStudent(student);
this.unitCode = code;
this.unitName = name;
}
public void enrolStudent(Student newStudent){
students = new ArrayList<Student>();
newStudent = new Student(24662496, "Kingsley", " Iwunze");
students.add(newStudent);
}
how can I call this enrolStudent() method on this Unit constructor in another class when I create a new Unit. all I need is to enroll students in units when units are created. below is my create unit method.
public void createUnits( ){
units = new ArrayList<Unit>();
units.add(new Unit("FIT2034", "Java Programming 2"));
units.add(new Unit("FIT2024", "Software Engineering"));
units.add(new Unit("MAT1830","Discrete Maths"));
unit.enrolStudent(new Student(25486321, "Julia", "Garcia"));
unit.enrolStudent(new Student(44589736, "James", "Olivia"));
unit.enrolStudent(new Student(47852103, "Lucky", "Thyriod"));
}
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Nov 19, 2014
I am getting error in second constructor that I have created, it gives an error: cannot find symbol variable
package Objects;
import javax.swing.JOptionPane;
public class Constructor {
public static void main(String[] args) {
Piggybank1 pg1 = new Piggybank1("Abhinav", 500);
pg1.deposit(200);
pg1.withdraw(10);
[Code] ....
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Jul 3, 2014
I am trying to call a constructor from PrepaidCard class in my main method, but I am not sure how to proceed.
As seen below, both the PrepaidCard constructor and the setCardID method have the ability to set the card ID.
public class PrepaidCard
{
public PrepaidCard(String id, int token) {
cardID = id;
tokenBalance = token;
}
public void setCardID(String id, int token) {
cardID = id;
tokenBalance = token;
}
}
Now in this block of code, I can successfully pass the id and token value by calling the setCardID method from the PrepaidCard class. Now I would like to call the PrepaidCard constructor from the PrepaidCard class to pass the id and token value, instead of using the setCardID method.
public class PrepaidCardTest
{
public static void main(String[] args) {
PrepaidCard card2 = new PrepaidCard(id, token);
System.out.print("Enter Card2 cardID: ");
id = input.nextLine();
card2.setCardID(id, token);
}
}
How to call the PrepaidCard constructor from the PrepaidCard class, to successfully pass the id and token value, in my main method?Specifically how to modify or replace this line of code so that it can correctly call the PrepaidCard constructor?
card2.setCardID(id, token);
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Jul 3, 2014
I am trying to call a constructor from PrepaidCard class in my main method, but I am not sure how to proceed.
As seen below, both the PrepaidCard constructor and the setCardID method have the ability to set the card ID.
Java Code:
public class PrepaidCard {
public PrepaidCard(String id, int token) {
cardID = id;
tokenBalance = token;
} public void setCardID(String id, int token) {
cardID = id;
tokenBalance = token;
}
} mh_sh_highlight_all('java');
Now in this block of code, I can successfully pass the id and token value by calling the setCardID method from the PrepaidCard class.
Now I would like to call the PrepaidCard constructor from the PrepaidCard class to pass the id and token value, instead of using the setCardID method.
Java Code:
public class PrepaidCardTest {
public static void main(String[] args) {
PrepaidCard card2 = new PrepaidCard(id, token);
System.out.print("Enter Card2 cardID: ");
id = input.nextLine();
card2.setCardID(id, token);
}
} mh_sh_highlight_all('java');
How to call the PrepaidCard constructor from the PrepaidCard class, to successfully pass the id and token value, in my main method?
Specifically how to modify or replace this line of code so that it can correctly call the PrepaidCard constructor?
Java Code: card2.setCardID(id, token); mh_sh_highlight_all('java');
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Sep 18, 2014
Its written that every constructor calls its super class constructor. And we know, constructors are called to create an object. Does it mean that if I am creating an object of a class, I am actually creating objects of all its super class???
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Jun 2, 2014
If I had this code:
<h:dataTable value="#{customer.customerList}" var="c"
styleClass="order-table"
headerClass="order-table-header"
rowClasses="order-table-odd-row,order-table-even-row"
>
And in the server getCustomerList() accessed to database, how many times getCustomerList() would be called from I request the xhtml page?. I have read this would be called several times because of JSF internals and It would be better to store it in a variable and access this variable.
1. Is this true this would be called several times? why?
2. If the previous statement was true, how to avoid it, I mean not call the method from a service?
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Feb 20, 2015
I want to call a servlet variable in jsp page textfields.Actually in servlet I fetch a jasper report properties in servlet variables and then this variable call from jsp page and after changing properties values this report saved.my servlet code is:
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
JasperReport jasperReport=null;
Connection con=null;
JasperDesign jasperDesign=null;
[code].....
so how to fetch servlet variable from jsp page textfields on load page and after edit that values then again save this values in jasper report on save button.
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Feb 13, 2014
I am just trying to test this array, for a locker combination program that involves classes...but the array is printing out the whacky numbers for the location. When I try to call the method in the main, it does not work. How do I call a method that exist within a class into the main method?
public class locker {
public static void main(String[] args) {
CombinationLock();
[code]....
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Feb 10, 2014
I am running a page that launches a Java Webstart app and a Java Applet. I don't have problem launching this page in Firefox, but I have to run it in IE11. The thing is IE11 keep redirecting me to oracle java download site. I have install Java RE like 3 times from IE already. What am I missing?
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Feb 14, 2014
I am a JSP/Servlet newbie currently adding the first servlets to a web site that had been static all along. My local instance worked great but the servlets did not respond on the test instance. Apparently, my hosting service provider requires me to use an invoker servlet mapping.
<servlet-mapping>
<servlet-name>invoker</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
Adding this to local web.xml broke the application but the servlets respond on test instance (when their calls are not preceded by another servlet call). A Servlet fails when it is called immediately after another servlet has been called.
What I saw happening on test is URL for first call is of the form:
xxx.org/<app-name>/servlet/<servlet-name>?Id=1
And URL for the second call became:
xxx.org/<app-name>/servlet/servlet/<servlet-name>?Id=1
The servlets are invoked using "href=servlet/<servlet-name>?Id="
How can I avoid the inclusion of 'servlet' in the URL and reset the URL to the JSP page it navigates to after processing of the servlet?
P.S.: I am also trying to enable the Invoker servlet on local so I can troubleshoot easier. I went through the changes to Tomcat's web.xml and context.xml. However, my local servlets did not respond even after calling them using "href=<servlet-name>?Id=". Is there a way I can check if my invoker is active?
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May 20, 2014
I am trying to use iText to create a PDF document. I found a nice tutorial online but one thing stumps me. How do I get the URL of the JSP page that contains the content? Since this will not be static, I don't want to hard code this. I am sure this is something simple but I am fairly new to servlets and JSP.
String File_To_Convert = "test.htm";
How do I get the url of the JSP page?
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Mar 18, 2015
i don't need ordinary javascript alert box. so i was use the jquery modal alert box for different action like success, error etc.but i have problem to call the alert box within servlet.
out.println("<link href="css/jquery.modal.css" type="text/css" rel="stylesheet" />");
out.println("<script type="text/javascript" src="js/jquery-latest.min.js">");
out.println("<script type="text/javascript" src="js/jquery.modal.min.js">");
out.println("<script type="text/javascript" src="js/jscript.js">");
out.println("<script type="text/javascript" src="js/success.js">");
out.println("<script type="text/javascript">");
response.getOutputStream().println("success();");
out.println("</script>");
how to call the modal function in the js file?
otherwise how to show the modal alert box?
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Mar 25, 2014
I am calling a jsp page from my servlet using the requestdispatcher.forward(myjsp.jsp) method. myjsp.jsp is creating a new thread which is parallely processing along with the servlet. The issue is that the jsp page is not displayed until the servlet finishes its execution, although the new thread is created by jsp and is executing in parallel. How do we have the jsp page displayed even when the servlet is executing.
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May 22, 2014
I have to convert servlet into jsp. but i dnt know how to convert servlet into jsp.This is my Servlet
package com.example.imagecalculation;
import java.awt.List;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.Iterator;
import java.io.File;
[code]....
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Mar 27, 2014
I have created a authentication servlet as follows :
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
/* Connexion la base de donnees */
try {
Class.forName("org.postgresql.Driver");
System.out.println("Driver O.K.");
[code]...
I just want to know how can i move to another jsp page from my servlet.
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May 30, 2014
I want to set the values coming from database with multiple field's Through AJAX and Custom XML. How to do ???
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Jan 24, 2014
I have xml-outout now i need to import to jsp page by using checkboxes...
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Sep 29, 2014
I've never had to do a void method call. I have my void method in one class and my main (where I want to do the call) in another. How do you actually call a void method?
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Jan 7, 2015
my Servlet as I would like my Servlet to run first and to create a session var then forward the value to the JSP (the GUI ) and have the JSP able to send a var back to the Servlet for reprocessing and update the session var to again be sent to the JSP and so on . - The Servlet contains logic to handle incorrect input types and directly out puts a HTML error page..
Below I will add the code I have so far and a link to the question in my Text Book.
My code:
JSP Page:
bank.JSP :
<%
//Starts outputting the HTML Form
%>
<html>
<head>
[Code].....
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Aug 12, 2014
I am trying to pass values from JSP Page to Servlets but I am getting a NullPointerException
Here is my JSP code
<html>
<head>
<title>Student Registration Form</title>
<style type="text/css">
h3{font-family: Calibri; font-size: 22pt; font-style: normal; font-weight: bold; color:SlateBlue;
text-align: center; text-decoration: underline }
table{font-family: Calibri; color:white; font-size: 11pt; font-style: normal;
[Code]...
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Jul 3, 2014
I have a code that writes the text file uploaded in a server but I want to write a text that I get it from jsp page by request, how can I write it?
FileInputStream fileToDownload ;
private static final int BYTES_DOWNLOAD = 1024;
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws IOException{
response.setContentType("text/plain");
String name = request.getParameter("n");
response.setHeader("Content-Disposition",
[Code] ....
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Nov 5, 2014
There are two designation named admin and student. I just need to work in coding to open specific page by email of person like done in facebook or any other mail account.
well one thing I have done is that I have matched email,password and type(designation) in my servlet page to database and the program run and also open the page.If email,pass,type matched witn admin than admin.jsp opens up else student.jsp.But but I wants to open the specific pafe by email that shows the profile of logged in user like in facebook it opens.
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May 18, 2014
How to call/define/describe self method.. below is my code :
Java Code:
public static void main(String[] args) {
banana1();
banana2();
banana3();
banana4();
banana5();
banana6();
[code]....
how exactly to call a self method ?
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Mar 28, 2014
What i have done till now is i make a table in html explicitly (by assigning fixed rows and columns) . Now what i want is to show a table of whose number of rows and columns are generated dynamically according to the table in the database.
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