I want to sent parameter from JSP to HTTP Servlet. but it doesn't work:(
I would like create a button to sent information to disable/enable user.
I'm still new to JSP and HTTP.
I hope can some one help me.
I hope it's enough to Overview
here my code:
admin.jsp
<%#page import="model.*"%>
<%#page import="java.util.*"%>
<%# page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
List<Category> categories = (List<Category>) request.getAttribute("categories");
List<User> users = (List<User>) request.getAttribute("users");
User credentials = (User) request.getSession().getAttribute("credentials");
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<jsp:include page="header.jsp"></jsp:include>
<jsp:include page="/WEB-INF/navbar.jsp"></jsp:include>
<h1 style="color:green;">Admin Control Page</h1>
<h2>categories</h2>
<% for (Category category : categories) { %>
<%=category.getName()%><br/>
<% } %>
<form method="post" action="<%=request.getContextPath()%>/admin" accept-charset="iso-8859-1">
<br/>
add new category: <input name="categoryName" />
<input type="hidden" name="event" value="createCategory" />
<input type="submit" />
</form>
<h2>users</h2>
<% for (User user : users){
if(user.getRole().getId()!= 1){
out.println("<a href='"+request.getContextPath()+"/user/"+user.getUsername()+"'><b>"+user.getUsername()+"</b></a>");
int id = user.getId();
%>
<%if(user.isEnabled()){ %>
//My Problem is here
<form action="/admin" method="POST">
<input value="<%user.getId();%>">
<input type="submit" value="Submit" />
</form>
<%}else if(!user.isEnabled()){
%>
// TODO Button
<%}%>
<p><hr>
<%
}
}
%>
</body>
</html>
AdminController.java
package controller;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.DatabaseManager;
import model.Category;
import model.User;
#WebServlet("/admin/*")
public class AdminController extends HttpServlet {
private DatabaseManager db = DatabaseManager.getInstance();
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// check admin, if not "error"
User user = (User) req.getSession().getAttribute("credentials");
if (user == null || !user.getRole().getName().equals("admin")) {
resp.sendError(403);
return;
}
// load page
req.setAttribute("categories", db.getCategoryDAO().findAll());
req.setAttribute("users", db.getUserDAO().findAll());
req.getRequestDispatcher("/WEB-INF/admin.jsp").forward(req, resp);
}
#Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// event
String event = req.getParameter("event");
// create new category
if (event.equals("createCategory")) {
String categoryName = req.getParameter("categoryName").trim();
try {
Category cat = new Category();
cat.setName(categoryName);
db.getCategoryDAO().create(cat);
} catch (IllegalArgumentException e) {
// error
req.setAttribute("msg", e.getMessage());
doGet(req, resp);
return;
}
// Create successful
resp.sendRedirect(req.getContextPath() + "/admin");
return;
}
String idTemp = req.getParameter("id");
try{
int id = Integer.parseInt(idTemp);
User user = db.getUserDAO().findById(id);
user.setEnabled(false);
} catch(IllegalArgumentException e){
e.getMessage();
return;
}
resp.sendRedirect(req.getContextPath() + "/admin");
return;
}
}
Change
#WebServlet("/admin/*")
To
#WebServlet("/admin")
And you can use either:
action="<%=request.getContextPath()%>/admin" or action="admin".
And if you are still having error then mention the error name :)
Related
What I am trying to do is a blog page with jsp. For this purpose, I save the content of blogs in an html file. I am using a jsp file to update the content in the existing html file via the browser. I used the textarea tag in a jsp file to edit this html file through the browser. There is no encoding problem in the html content transferred to the textarea. But when I make changes to the html file and save it, the utf-8 characters turn out to be incorrect. For Example:
The html file is read and placed comfortably in the textarea without any encoding problems
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<h1>Evrim Üzerine Notlar</h1>
</body>
</html>
When i submit for save it:
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<h1>Evrim Ãzerine Notlar</h1>
</body>
</html>
There is the classes and jsp files:
setBlog.jsp (Html file is setting in this file)
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%#taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<jsp:include page="navbar.jsp"/>
<form action="adminBlogProcess?meth=update" method="post">
id:<input type="text" readonly="readonly" value="${setMe.textId}" name="tid">
<label>Text Title</label>
<input type="text" name="name" class="form-control" value="${setMe.name}"/>
<label>File Path</label>
<input type="text" name="textPath" class="form-control" value="${setMe.textPath}"/>
<label>Kategori</label>
<select class="form-control" name="selectedCategory">
<c:forEach items="${loc}" var="val">
<option value="${val.categoryId}">${val.categoryName}</option>
</c:forEach>
</select>
<label>İçerik:</label>
<textarea class="form-control" name="content" rows="100">${contentOfDoc}</textarea>
<input type="submit" class="btn btn-primary" value="Save Changes">
</form>
</body>
</html>
AdminBlogProcess.java
package Controller;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import DataAccess.CategoryDao;
import DataAccess.TextDao;
import Model.Category;
import Model.Text;
#WebServlet("/adminBlogProcess")
public class AdminBlogProcess extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = -7693704779591981580L;
private CategoryDao cd;
private TextDao td;
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
#Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String meth = req.getParameter("meth");
String msg="";
if (meth.equalsIgnoreCase("update")) {
update(req);
msg="Yazı Güncellendi!";
} else if (meth.equalsIgnoreCase("add")) {
} else if (meth.equalsIgnoreCase("delete")) {
}
req.setAttribute("message", msg);
req.getRequestDispatcher("/admin/admin.jsp").forward(req, resp);
}
//This update method is write new content into the html file
private void update(HttpServletRequest req) {
String name=req.getParameter("name");
String textPath=req.getParameter("textPath");
int id=Integer.valueOf(req.getParameter("tid"));
Category ct=getCd().getCategoryById(Integer.valueOf(req.getParameter("selectedCategory")));
Text txt=new Text(name, textPath, ct, id);
getTd().update(txt);
String content=req.getParameter("content");
String path="C:\\Users\\90551\\Desktop\\Eclipse Projeler\\2022 Yaz-Haziran Arsiv\\JAVA SERVER PAGES\\004BlogSitesi\\src\\main\\webapp\\texts\\"+textPath;
try (FileWriter fw = new FileWriter(new File(path), StandardCharsets.UTF_8);
BufferedWriter bw = new BufferedWriter(fw)){
bw.write("");
bw.append(content);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public CategoryDao getCd() {
if (cd == null) {
cd = new CategoryDao();
}
return cd;
}
public void setCd(CategoryDao cd) {
this.cd = cd;
}
public TextDao getTd() {
if (td == null) {
td = new TextDao();
}
return td;
}
public void setTd(TextDao td) {
this.td = td;
}
}
What should i do for fix that encodin problem?
I have a logout servlet that doesn't seem to work. After I go to /logout page it does redirect back to /home, however the user's first and last name as well as the Logout button are still present:
Before logout:
After logout:
LogoutServlet.java:
public class LogoutServlet extends HttpServlet {
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
try {
HttpSession session = request.getSession(false);
if (session != null) {
session.removeAttribute("user");
session.invalidate();
}
response.sendRedirect(request.getContextPath() +
"/home");
}
catch (Exception e) {
e.printStackTrace();
}
}
}
header.jsp:
<%# page import="comediansapp.entities.main.User" %>
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<div class = "header-container">
<div class = "header">
<%if(session.getAttribute("user") == null){%>
<div class = "header-buttons">
Login
Signup
</div>
<%
} else {%>
<div class="user-email">
<%
User user = (User) session.getAttribute("user");
out.println(user.getFirstname() + " " +
user.getLastname());
%>
</div>
<div class="button logout-button">
Logout
</div>
<%
}
%>
</div>
</div>
home.jsp:
<%# page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<jsp:include page="../shared/header.jsp" />
</body>
</html>
I forgot to put
#WebServlet("/logout")
on top of the LogoutServlet class.
I have to ask you because i'm stuck and can't go on. I'm trying to make response path like this:
DAO-> Servlet-> JSP
The process is: user fills the form on jsp, clicks "Submit" and gets response on the same JSP (user added or didn't)
adding data to DB is working fine but i got error from WebBrowser :
Type Exception Report
Message can't parse argument number: pageContext.request.contextPath
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
here is my jsp code:
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%# taglib prefix ="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%# taglib prefix ="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%# taglib prefix ="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%# page isELIgnored="false"%>
<script type="text/javascript" src="${pageContext.request.contextPath}/jQuery.js"/></script>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>dodaj pracownika</title>
</head>
<body>
<f:view>
<section id = registration" class = "section">
<div class "container tagline">
<em>{0}</em>
</div>
<br>
<AdContentProvider
Name="MIME-type"
Provider="addUser.class"
Properties="optional-properties-for-your-class"
>
</AdContentProvider>
<form action="${pageContext.request.contextPath}/newuser" method = "post">
<form>
<label> Imie</label> <input type="text" name= "imie" id="imie"> <br/>
<label> Nazwisko</label> <input type="text" name= "nazwisko" id="nazwisko"> <br/>
<label> Stanowisko</label> <input type="text" name= "stanowisko" id="stanowisko"> <br/>
<label> Stawka</label> <input type="text" name= "stawka" id="stawka"> <br/>
<input type ="submit" value="Dodaj" id = "dodaj">
</form>
</f:view>
</body>
</html>
and servlet code:
package tk.jewsbar.servlets;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.text.MessageFormat;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.Transactional;
import fasolki.Pracownik;
import tk.jewsbar.dao.Dao;
#WebServlet("/newuser")
public class addUser extends HttpServlet
{
#Override
#Transactional
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
String imie = req.getParameter("imie");
String nazwisko = req.getParameter("nazwisko");
String stanowisko = req.getParameter("stanowisko");
double stawka = Double.valueOf(req.getParameter("stawka"));
Pracownik pracownik = new Pracownik (imie, nazwisko, stanowisko, stawka);
Dao dao = new Dao();
int rows = dao.dodajUzytkownika(pracownik);
String err = "null";
if (rows ==0)
{
err = "Niestety nie udalo sie dodac uzytkownika";
}
else {
err = "Dodano uzytkownika" + rows;
}
String pejcz = getHTMLString(req.getServletContext().getRealPath("html/newuser.jsp"), err);
resp.getWriter().write(pejcz);
}
public String getHTMLString(String sciezka, String message) throws IOException
{
BufferedReader czytaj = new BufferedReader (new FileReader(sciezka));
String linia = "";
StringBuffer bufor = new StringBuffer();
while((linia=czytaj.readLine())!= null)
{
bufor.append(linia);
}
czytaj.close();
String pejcz = bufor.toString();
pejcz = MessageFormat.format(pejcz, message);
return pejcz;
}
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String pejcz = getHTMLString(req.getServletContext().getRealPath("html/newuser.jsp"),"");
resp.getWriter().write(pejcz);
}
}
try like this
<script type="text/javascript" src="<c:out value="${contextPath}"/>/jQuery.js"></script>
or
<script type="text/javascript" src="<c:out value="${pageContext.request.contextPath}"/>/jQuery.js"></script>
Instead of
<script type="text/javascript" src="${contextPath}/jQuery.js"/></script>
You may read the suggestions on this link ,
expression-language-in-jsp-not-working
I keep looking online for answers to put my inputs into sessions so I can output on a receipt page but all of them are different. Is there a preferred way someone could should me?
I will post my servlet and form below
Form
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# page import="java.util.ArrayList" %>
<%#taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Customer Management</title>
</head>
<body>
<form action="customerServlet" method="post">
<c:set var="customer" items="${sessionScope.customers}">
First Name:<br>
<input type="text" name="firstName"/><br>
<c:out value="${customer.getFirstName() }"></c:out>
Last Name:<br>
<input type="text" name="lastName" <c:out value="customer.getLastName()"></c:out>/><br>
Email:<br>
<input type="text" name="email"/><br>
Phone Number:<br>
<input type="text" name="phone"/><br>
Phone Type:<br>
<select name="thePhones" id="selectPhones">
<option selected value="choose">
Select a Phone
</option>
<c:forEach items="${sessionScope.phones}" var="current" >
<option>${current.getPhoneName()}</option>
</c:forEach>
</select><br>
Street Address:<br>
<input type="text" name="streetAddress"/><br>
Apartment Number:<br>
<input type="text" name="apartmentNumber"/><br>
City:<br>
<input type="text" name="city"/><br>
State:<br>
<select name="states" id="states">
<option selected value="Wisconsin">
Select a State
</option>
<c:forEach items="${sessionScope.states}" var="current" >
<option>${current.getStates()}</option>
</c:forEach>
</select>
<input type="submit" value="submit">
</c:set>
</form>
</body>
</html>
Servlet
package edu.witc.Assignment03.controller;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//import javax.servlet.annotation.WebServlet;
//import javax.servlet.http.HttpServlet;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import edu.witc.Assignment03.model.Customer;
import edu.witc.Assignment03.model.Phone;
import edu.witc.Assignment03.model.States;
#WebServlet(description = "servlet to get act as controller between form and models", urlPatterns = { "/customerServlet","/addCustomer","/addPet", "/customerManagement" })
public class CustomerServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public CustomerServlet() {
super();
}
private void processRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
HttpSession session = request.getSession();
Phone phone = new Phone();
States state = new States();
Collection<Phone> phones = phone.getPhoneCollection();
Collection<States> states = state.getStateCollection();
session.setAttribute("phones", phones);
session.setAttribute("states", states);
//}
}
private List<edu.witc.Assignment03.model.Customer> customers = new ArrayList<Customer>();
private void addCustomer(HttpServletResponse response, HttpServletRequest request)//redirect to index
throws IOException, ServletException {
String url = "/customerManagement.jsp";
processRequest(request, response);
request.getRequestDispatcher(url).forward(request,response);
}
private void addPet(HttpServletResponse response, HttpServletRequest request)//redirect to index
throws IOException, ServletException {
String url = "/pets.jsp";
request.getRequestDispatcher(url).forward(request,response);
}
private Customer getCustomer(int customerId) {
for (Customer customer : customers) {
if (customer.getCustomerId() == customerId) {
return customer;
}
}
return null;
}
private void makeCustomerReceipt(HttpServletRequest request,
HttpServletResponse response) throws IOException, ServletException {
String url = "/receipt.jsp";
request.setAttribute("customers", customers);
request.getRequestDispatcher(url).forward(request,response);
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String action = request.getParameter("action");
if("addCustomer".equals(action)) {
addCustomer(response, request);
}
else if("addPet".equals(action)) {
addPet(response, request);
}
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// update customer
int customerId = 0;
try {
customerId =
Integer.parseInt(request.getParameter("id"));
} catch (NumberFormatException e) {
}
Customer customer = getCustomer(customerId);
if (customer != null) {
customer.setFirstName(request.getParameter("firstName"));
customer.setLastName(request.getParameter("lastName"));
customer.setEmail(request.getParameter("email"));
customer.setPhone(request.getParameter("phone"));
customer.setAddress(request.getParameter("address"));
customer.setCity(request.getParameter("city"));
customer.setZip(request.getParameter("zip"));
makeCustomerReceipt(request, response);
}
}
}
I want to read in a textbox a name and I want to pass-it to the next form, and it would be a problem that the form doesn't reset to show only the second form, "basic.jsp". Is there any command to reset the form? Now it shows me the content of basic.jsp mixed up with the index.jsp (request of the name)...
-HelloWorld.java:
package javapapers.sample.ajax;
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 HelloWorld extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws java.io.IOException, ServletException {
res.setContentType("text/html");
res.getWriter().write("Hey!");
String textNume = req.getParameter("userInput");
req.setAttribute("nume",textNume);
RequestDispatcher requestDispatcher = req.getRequestDispatcher("basic.jsp");
requestDispatcher.forward(req,res);
}
}
- index.jsp:
<%# page contentType="text/html;charset=UTF-8" language="java" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" language="javascript" src="ajax.js"></script>
</head>
<body>
<BR>Please enter your name:<input type='text' id='userInput'/>
<div id="hello"><button type="button" onclick="makeRequest()">Adauga</button></div>
<div id="ttt"><input type="text"></input></div>
<p>Welcome to the site <b id='boldStuff'>dude</b> </p>
</script>
</body>
</html>
- ajax.js:
function getXMLHttpRequest() {
var xmlHttpReq = false;
// to create XMLHttpRequest object in non-Microsoft browsers
if (window.XMLHttpRequest) {
xmlHttpReq = new XMLHttpRequest();
} else if (window.ActiveXObject) {
try {
// to create XMLHttpRequest object in later versions of Internet Explorer
xmlHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
} catch (exp1) {
try {
// to create XMLHttpRequest object in older versions of Internet Explorer
xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
} catch (exp2) {
xmlHttpReq = false;
}
}
}
return xmlHttpReq;
}
//AJAX call starts with this function
function makeRequest() {
var xmlHttpRequest = getXMLHttpRequest();
xmlHttpRequest.onreadystatechange = getReadyStateHandler(xmlHttpRequest);
xmlHttpRequest.open("POST", "helloWorld.do", true);
xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
var userInputValue = document.getElementById('userInput').value;
xmlHttpRequest.send("userInput=" + userInputValue);
}
function getReadyStateHandler(xmlHttpRequest) {
// an anonymous function returned it listens to the XMLHttpRequest instance
return function() {
if (xmlHttpRequest.readyState == 4) {
if (xmlHttpRequest.status == 200) {
var userInput = document.getElementById("userInput").value;
document.getElementById("hello").innerHTML = xmlHttpRequest.responseText; //"hey" def.in java!
document.getElementById("ttt").innerHTML = userInput;
} else {
alert("HTTP error " + xmlHttpRequest.status + ": " + xmlHttpRequest.statusText);
}
}
};
}
- basic.jsp:
<%# page contentType="text/html;charset=UTF-8" language="java" %>
<HTML>
<HEAD>
<TITLE>Elemente de identificare</TITLE>
</HEAD>
<BODY>
<H1>Elemente de identificare</H1>
Domnule <%= request.getAttribute("nume") %> alegeti elementele de identificare:<br>
Felul notificarii<br>
<select name="fel_notif">
<option value="Prima notificare">Prima notificare</option>
<%--<option value="Monday" selected>Monday</option>--%>
</select><br>
Mailul dvs <br><textarea rows="1" cols="30" name="mail"></textarea><br>
Caracterizare <br><textarea rows="3" cols="30" name="caract"></textarea><br>
Circumstante <br><textarea rows="3" cols="30" name="circ"></textarea><br>
Masuri de atenuare <br><textarea rows="3" cols="30" name="masuri"></textarea><br>
Cod notificare: <input type="text" name="cod" value="scot din BD" readonly><br>
<INPUT TYPE="SUBMIT" value="Trimite">
<%--<script type="text/javascript" language="javascript" src="ajax.js"></script>
<div id="pdf"><button type="button" onclick="makeRequest()">Creaza PDF</button></div>--%>
</BODY>
</HTML>
Your not sending userInput to the server. You have to add it to the request to be able to receive it in the servlet. Now you're just doing xmlHttpRequest.send(null). Instead, send the parameter string representing the data from your input. Something like:
xmlHttpRequest.send("userInput=" + userInputValue);