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?
Related
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
bookReg.jsp
<%#page import="classes.BooksDTO"%>
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<link type="text/css" href="css/mainStyle.css">
</head>
<body>
<%
//D:\Hayden\учеба\джава\JavaBigData\readers\WebContent\img - folder directory
%>
<form action="bookRegProc.jsp" method="post" enctype="multipart/form-data">
Title <input type="text" name="title"> <br>
Plot <textarea rows="30" cols="40" name="plot"></textarea> <br>
<input type="hidden" name="rating" value="0"> <br>
Author <input type="text" name="author"> <br>
Publisher <input type="text" name="publisher"> <br>
Genre <input type="text" name="genre"> <br>
Publication date <input type="text" name="date"> <br>
Cover <input type="file" name="cover" size="50"> <br>
<input type="submit" value="Register"> <br>
</form>
</body>
</html>
bookRegProc.jsp
<%#page import="classes.Uploader"%>
<%#page import="org.apache.commons.fileupload.FileItem"%>
<%#page import="java.util.Iterator"%>
<%#page import="java.util.List"%>
<%#page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
<%#page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
<%#page import="java.io.File"%>
<%#page import="classes.BooksDTO"%>
<%#page import="classes.BooksDAO"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Uploader upload = new Uploader();
upload.doPost(request, response);
%>
</body>
</html>
Uploader.java
package classes;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Paths;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class Uploader extends HttpServlet {
BooksDTO dto = null;
BooksDAO dao = new BooksDAO();
String title = null;
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String title = request.getParameter("title"); // Retrieves <input type="text" name="description">
String plot = request.getParameter("plot");
String rating = request.getParameter("rating");
String author = request.getParameter("author");
String publisher = request.getParameter("publisher");
String genre = request.getParameter("genre");
String date = request.getParameter("date");
Part filePart = request.getPart("file"); // Retrieves <input type="file" name="file">
/*String fileName = title;
InputStream fileContent = filePart.getInputStream();*/
// ... (do your job here)
//DTO process
BooksDTO dto = new BooksDTO();
BooksDAO dao = new BooksDAO();
dto.setTitle(title);
dto.setAuthor(author);
dto.setDate(date);
dto.setGenre(genre);
dto.setPlot(plot);
dto.setPublisher(publisher);
dto.setRating(rating);
try {
dao.insert(dto);
//this inserts all the parameters into database
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//File process
File file;
int maxFileSize = 5000 * 1024;
int maxMemSize = 5000 * 1024;
String filePath = "D:/Hayden/Eclipse workspace/bigdata/readers/WebContent/img/";
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(maxMemSize);
factory.setRepository(new File("C:/temp"));
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setSizeMax(maxFileSize);
try {
FileItem fi = (FileItem) filePart;
if(!fi.isFormField()) {
file = new File(filePath + dto.getTitle() + ".jpg");
fi.write(file);
}
}catch(Exception ex) {
System.out.println(ex);
}
}
}
I want to pass text parameters from bookReg.jsp to register it in my database.
I checked the methods for inserting into database works totally fine.
but in doPost method, Uploader.java, request.getParameter passes null to each String.
I searched how to pass text to a servlet for days and I finally followed this instruction : How to upload files to server using JSP/Servlet? (first answer)
but it still passes null only.
what is the difference between passing parameter using request.getParameter in jsp and in a java class as I wrote?
and what is causing the same problem even if I followed the instruction of the first answer in the page that I followed?
(I am using tomcat 8.5 and eclipse oxygen)
Hey I am trying to create a voting app.
I have several counters in my servlets and I want to be able to display the value of those counters in my jsp file. How do I do it?
Please help me.
I want to display the total number of votes in each section and the winner after the election.
......................................................................................................................................................
servlet file
......................................................................................................................................................
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;
#WebServlet("/CastVote")
public class CastVote extends HttpServlet {
int javaCount, phpCount, pythonCount, othersCount;
public CastVote() {
super();
javaCount = 0;
phpCount = 0;
pythonCount = 0;
othersCount = 0;
// TODO Auto-generated constructor stub
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String choice = request.getParameter("language");
if("java".equals(choice))
{
javaCount++;
}
else if("php".equals(choice))
{
phpCount++;
}
else if("python".equals(choice))
{
pythonCount++;
}
else if("others".equals(choice))
{
othersCount++;
}
}
}
......................................................................................................................................................
Jsp File
......................................................................................................................................................
<%# 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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Vote now.</title>
</head>
<body>
<center>
<h2>Welcome to voting portal. Cast your vote.</h2>
</center>
<form action="CastVote" method="post">
Which of the following is the best language for backend programming? <br>
<input type="radio" name="language" value="java">1) Java <br>
<input type="radio" name="language" value="php">2) PHP <br>
<input type="radio" name="language" value="python">3) Python <br>
<input type="radio" name="language" value="others">4) Others <br>
<input type = "submit" value ="Vote">
</form>
</body>
</html>
I am really confused about this question. I have tried everything and nothing works.
I want to be able to get the volume and display it as param.volume. However it will return zero if I do it as a scriptlet.
I want to be able to create the getter method named getVolume that returns the volume of the cube when called (side * side * side).
My getter method is:
package servlets;
public class Cube {
private int side;
private int volume;
public void setVolume(int volume){
this.volume=volume;
}
public int getVolume() {
volume=side*side*side;
return volume;
}
public int getSide() {
return side;
}
public void setSide(int side) {
this.side = side;
}
}
In the CalcServlet:
package servlets;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class CalcServlet
*/
#WebServlet("/calc")
public class CalcServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String scube=request.getParameter("cube");
Cube obj=new Cube();
try{
int cube=Integer.parseInt(scube);
obj.setSide(cube);
obj.getVolume();
request.setAttribute("cube", obj);
}catch(NumberFormatException e){
}
ServletContext sc = this.getServletContext();
//RequestDispatcher rd = request.getRequestDispatcher("/WEB-INF/pages/result.jsp");
RequestDispatcher rd = sc.getRequestDispatcher ("/WEB-INF/pages/result.jsp");
rd.forward(request, response);
}
}
In result.jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib prefix="c"
uri="http://java.sun.com/jsp/jstl/core" %>
<%# taglib tagdir="/WEB-INF/tags" prefix="myjsp" %>
<%# page import="servlets.Cube, servlets.CalcServlet " %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<body>
<h2>Cube Info Using JSP 2.0 </h2><br>
<b>Side of a Cube: ${param.side} </b><br>
<b>Volume of a Cube: ${param.side*param.side*param.side}</b><br>
<br></br><br>
Using Custom Tag:
<myjsp:displayform color="red"></myjsp:displayform>
<br></br><br>
<h2>Using JSTL:</h2>
<h2>Cube Info Using JSP 2.0 </h2><br>
<b>Side of a Cube: ${param.side} </b><br>
<b>Volume of a Cube: </b>
<c:choose>
<c:when test="${param.side*param.side*param.side>10}">
<li><span style="color: red;">Volume: ${param.side*param.side*param.side}</span></li>
</c:when>
<c:otherwise>
<li><span style="color: black;">Volume: ${param.side*param.side*param.side}</span></li>
</c:otherwise>
</c:choose>
</body>
</html>
The result displays because param.side is being read. However I want to do this with param.volume. Please help!! I have tried everything.
first fix your getter/setter for volume. right now your getter act like a setter.
public void setVolume(int Volume){
this.volume=volume;
}
public int getVolume() {
return volume;
}
then in your serlvet (proper pratice would be to do that in an utility class)
int side=Integer.parseInt(scube);
obj.setSide(side);
int volume= side*side*side;
obj.setVolume(volume);
request.setAttribute("cube", obj);
you named your parameter which contains the bean Cube "cube". On that line
request.setAttribute("cube", obj);
so to access the bean cube in your JSP you should do like that
${cube.side}
${cube.volume}
or the proper way
<c:out value="${cube.side}"/>
<c:out value="${cube.volume}"/>
For anyone who wants to know the answer, I got it from a friend. Hope this will benefit the community.
In result.jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib prefix="c"
uri="http://java.sun.com/jsp/jstl/core" %>
<%# taglib tagdir="/WEB-INF/tags" prefix="myjsp" %>
<%# page import="servlets.Cube"%>
<%
Cube cube = (Cube) request.getAttribute("cube");
int side = 0, volume = 0;
if (cube != null) {
side = cube.getSide();
volume = cube.getvolume();
}
%>
<!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">
<body>
<h2>Cube Info Using JSP 2.0 </h2><br>
<b>Side of a Cube: ${cube.side} </b><br>
<b>Volume of a Cube: ${cube.getvolume()}</b><br>
<br></br><br>
Using Custom Tag:
<myjsp:displayform color="red"></myjsp:displayform>
<br></br><br>
<h2>Using JSTL:</h2>
<h2>Cube Info Using JSP 2.0 </h2><br>
<b>Side of a Cube: ${cube.side} </b><br>
<b>Volume of a Cube: <c:if test="${cube.volume}">10><font color="red"></font>the volume is ${cube.getvolume()}</c:if></b><br>
</body>
</html>
And in calcservlet:
package servlets;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class CalcServlet
*/
#WebServlet("/calc")
public class CalcServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
RequestDispatcher rd = request.getRequestDispatcher("/WEB-INF/pages/result.jsp");
rd.forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String scube=request.getParameter("side");
Cube obj=new Cube();
try{
int cube=Integer.parseInt(scube);
obj.setSide(cube);
System.out.println("works");
obj.getvolume();
request.setAttribute("cube", obj);
}catch(NumberFormatException e){
}
RequestDispatcher rd = request.getRequestDispatcher("/WEB-INF/pages/result.jsp");
rd.forward(request, response);
}
}
In Cube:
package servlets;
public class Cube {
private int side;
public int getvolume() {
return side*side*side;
}
public int getSide() {
return side;
}
public void setSide(int side) {
this.side = side;
}
}
In form.jsp:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Form</title>
</head>
<body>
</head>
<body>
<h2>Side Form</h2> <!-- page heading -->
<form method=post action="calc"><!-- open a neew form -->
Side of a Cube: <input type=number name=side required><br> <!-- the iname parameter -->
<br></br>
<input type=submit value=Calculate><br> <!-- submit to the home page if everything is fine, else additem servlet and display the new item -->
<br><br><br></br>
</form> <!-- close form -->
</body>
</html>
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 :)