I am new on servlet.i have made # clases(Login,Logout,Profile).A simple error that i not solved.A link passes to call the all classes.Login and Logout work properly bt when i click on profile , it will show Downloaded file option.Please help Me , Tnkx in advance.
Logout.java
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out=response.getWriter();
request.getRequestDispatcher("link.html").include(request, response);
Cookie ck=new Cookie("uername", "");
ck.setMaxAge(0);
response.addCookie(ck);
out.print("you are successfully logged out!");
Login.java
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out=response.getWriter();
request.getRequestDispatcher("link.html").include(request, response);
String username=request.getParameter("name");
String password=request.getParameter("password");
if(username.equals("pr"))
{
out.print("You are successfully logged in!");
out.print("<br>Welcome, "+username);
Cookie ck=new Cookie(username, username);
response.addCookie(ck);
}
else{
out.print("sorry, username or password error!");
request.getRequestDispatcher("login.html").include(request, response);
}
out.close();
}
Profile.java
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("html/text");
PrintWriter out=response.getWriter();
request.getRequestDispatcher("link.html").include(request, response);
Cookie ck[]=request.getCookies();
System.out.println(ck[0].getValue());
if(ck!=null)
{
String name=ck[0].getValue();
if(!name.equals(null)||name!=null)
{
out.print("<b>Welcome to Profile</b>");
out.print("<br>Welcome, "+name);
}
}
else{
out.print("Please login first");
request.getRequestDispatcher("login.html").include(request, response);
}
out.close();
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<servlet>
<description></description>
<display-name>LoginServlet</display-name>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.servletcookie.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/LoginServlet</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>ProfileServlet</display-name>
<servlet-name>ProfileServlet</servlet-name>
<servlet-class>com.servletcookie.ProfileServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ProfileServlet</servlet-name>
<url-pattern>/ProfileServlet</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>LogoutServlet</display-name>
<servlet-name>LogoutServlet</servlet-name>
<servlet-class>com.servletcookie.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/LogoutServlet</url-pattern>
</servlet-mapping>
<!-- <welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list> -->
</web-app>
response.setContentType("html/text");
should be
response.setContentType("text/html");
Related
So I'm a making a small web app to get information about games, I have made a searchBar that request the search to an API and then I get the first 10 games with the most similar title to the search. But I only show the title.
This is an example of a search
The games have a lot of attributes, one of them is the ID, and it allows me to get all the info of a game using a controller.
Right now the app works like this:
1: You search the title of a game
2. A controller gives me a List of IDs and with the ids I get the rest of the info about the games, but I only show the titles.
Now, what I want to do:
3.When you click on a title you use a controller, and from the ID it request (again, I'm not sure if I can use the previous games objects) all the info from that game and Shows it.
The controllers works fine, but I'm having problems with the HTML.
This is the controller for the search:
...
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String query = request.getParameter("searchQuery");
RequestDispatcher rd = null;
log.log(Level.FINE, "Searching for games that contain " + query);
GameResource game = new GameResource();
GameSearch[] gameResults = null;
gameResults = game.getGameSearch(query);
//System.out.println(Arrays.toString(gameResults));
List<Game> listaBusqueda = new ArrayList<Game>();
if (gameResults.length!=0){
rd = request.getRequestDispatcher("/success.jsp");
for (GameSearch g : gameResults) {
listaBusqueda.add(game.getGame(g.getId().toString()));
}
request.setAttribute("games", listaBusqueda);
} else {
log.log(Level.SEVERE, "Game object: " + gameResults);
rd = request.getRequestDispatcher("/error.jsp");
}
rd.forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
...
This is the controllers that gives me a game using an ID
...
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String gameId = request.getParameter("id");
GameResource resource = new GameResource();
RequestDispatcher rd = null;
log.log(Level.FINE, "Retrieving game");
Game game = resource.getGame(gameId);
if(game!=null) {
rd = request.getRequestDispatcher("/success.jsp");
request.setAttribute("Game", game);
request.setAttribute("Item", "gameID");
} else {
log.log(Level.SEVERE, "Cannot retrieve game: ");
rd = request.getRequestDispatcher("/error.jsp");
rd.forward(request, response);
}
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
Both of them works, in the last one the objects are created correctly and the ID is obtained.
Now, this is the html for success.jsp, and this is where the problem is:
<%# 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"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link rel="stylesheet" type="text/css" href="style.css">
<title>Search results</title>
</head>
<body>
<fieldset id="IGDB">
<legend>
IGDB search for
<c:out value="${param.searchQuery}" />
</legend>
<c:forEach items="${requestScope.games}" var="game">
<article name="gameArticle" id="gameArticle"></article>
<a href="GameIdController?id=${game.id}"><c:out value="${game.name}"
/></a>
<br />
</c:forEach>
</fieldset>
<c:if test="${requestScope.Item=='gameID' }">
<c:forEach items="${requestScope.Game}" var="game">
<article name="gameArticle" id="gameArticle"></article>
<c:out value="${game.name}" />
<br />
</c:forEach>
$game = ${requestScope.Game}
<c:out value="${game.name}"/>
</c:if>
<article name = "gameByIDArticle" id = "gameByIDArticle">
</article>
</body>
</html>
When I click in a title, I get redirected to a blank webpage (http://localhost:8090/GameIdController?id=IdOfTheGame),as you can see the id is included in the URL, but it's completely blank and it should include the title again as is stated in my code.
I will also include my web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<servlet>
<description></description>
<display-name>GameSearchController</display-name>
<servlet-name>GameSearchController</servlet-name>
<servlet-class>aiss.controller.GameSearchController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GameSearchController</servlet-name>
<url-pattern>/GameSearchController</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>GamePopularityController</display-name>
<servlet-name>GamePopularityController</servlet-name>
<servlet-class>aiss.controller.GamePopularityController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GamePopularityController</servlet-name>
<url-pattern>/GamePopularityController</url-pattern>
</servlet-mapping>
<context-param>
<param-name>resteasy.servlet.mapping.prefix</param-name>
<param-value>/api</param-value>
</context-param>
<servlet>
<servlet-name>Resteasy</servlet-name>
<servlet-
class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
</servlet-
class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>aiss.api.GameApplication</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Resteasy</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/error.jsp</location>
</error-page>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>GameIdController</display-name>
<servlet-name>GameIdController</servlet-name>
<servlet-class>aiss.controller.GameIdController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GameIdController</servlet-name>
<url-pattern>/GameIdController</url-pattern>
</servlet-mapping>
</web-app>
Okay i think i understand why you are seeing a blank page. Everything is working as expected, the problem seems to be with this:
if(game!=null) {
rd = request.getRequestDispatcher("/success.jsp");
request.setAttribute("Game", game);
request.setAttribute("Item", "gameID");
} else {
log.log(Level.SEVERE, "Cannot retrieve game: ");
rd = request.getRequestDispatcher("/error.jsp");
rd.forward(request, response);
}
The reason why you are seeing a blank page is because your game variable is not null. And you don't have a forward statement in the first part of that if else block.
if(game!=null) {
rd = request.getRequestDispatcher("/success.jsp");
request.setAttribute("Game", game);
request.setAttribute("Item", "gameID");
rd.forward(request, response); // missing this!
} else {
log.log(Level.SEVERE, "Cannot retrieve game: ");
rd = request.getRequestDispatcher("/error.jsp");
rd.forward(request, response);
}
EDIT: In response to your other problem from the comment, i think the forEach is having problems because of this:
<c:forEach items="${requestScope.Game}" var="game">
change it to this:
<c:forEach items="${Game}" var="game">
I have a simple program which get username and password, if the password is servlet then it will forward to the welcome page, else, it will show a message and includes html login form.
When I enter username and password and click on login, no matter what, it always shows me the "HTTP Status 405 : HTTP method GET is not supported by this URL" error.
I have read a lot of questions and answers here, none of them helped me to solve this problem.
Here's my code:
Simple.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.http.*;
public class Simple extends HttpServlet {
#Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String p=request.getParameter("userPass");
if(p.equals("servlet")){
RequestDispatcher rd=request.getRequestDispatcher("welcome");
rd.forward(request, response);
}
else{
out.print("Sorry username or password error!");
RequestDispatcher rd=request.getRequestDispatcher("index.html");
rd.include(request, response);
}
}
}
WelcomeServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class WelcomeServlet extends HttpServlet {
#Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String n=request.getParameter("userName");
out.print("Welcome "+n);
}
}
index.html
<form action="go" method="post">
Name:<input type="text" name="userName"/><br/>
Password:<input type="password" name="userPass"/><br/>
<input type="submit" value="login"/>
</form>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>Simple</servlet-name>
<servlet-class>Simple</servlet-class>
</servlet>
<servlet>
<servlet-name>WelcomeServlet</servlet-name>
<servlet-class>WelcomeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Simple</servlet-name>
<url-pattern>/go</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>WelcomeServlet</servlet-name>
<url-pattern>/welcome</url-pattern>
</servlet-mapping>
</web-app>
Here is my code.,
Javascript
$(document).ready(function()
{
$("button").click(function(){
$.post("AjaxpostloginServlet.java",
{
name:"kevin",
pass:"Duckburg"
});
});
});
Java servlet
package com.iappuniverse.ajaxpostlogin;
import java.io.IOException;
import javax.servlet.http.*;
#SuppressWarnings("serial")
public class AjaxpostloginServlet extends HttpServlet
{
public void doPost(HttpServletRequest req, HttpServletResponse resp)throws IOException
{
String name=req.getParameter("name");
System.out.println(name);
}
}
The name here in the servlet doesn't get printed in the console. Trying to send data to the server using ajax .post(), but cannot make the servlet linked to the ajax .post() call run.
Change your web.xml to something like the below
<?xml version="1.0" encoding="ISO-8859-1" ?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>Application</display-name>
<description>
Description Example.
</description>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>AjaxpostloginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>
lets take it a step further and change your servlet post method
public void doPost(HttpServletRequest req, HttpServletResponse resp)throws IOException {
String name=req.getParameter("name");
response.setContentType("text/plain");
response.setCharacterEncoding("UTF-8");
response.getWriter().write(name);
}
finally change the url of the ajax call and use a callback function.
$(document).ready(function() {
$("button").click(function() {
$.post("login",{
name:"kevin",
pass:"Duckburg"
}).done(function( data ) {
alert( "name: " + data );
})
});
});
Disclaimer:
I haven't test it!
I'm new in the servlets thing, and I've seen that there's a lot of code that explains how to make a complete road through the request-response of the servlet, but most of cases they use the response.getWritter().println("something"), but, I've seen that there's another ways to generate html content, like the index page that should charge by default when the servlet is accessed. I have a basic example of a servlet and the web.xml, I want to know if you can help me to understand what I can do to make the index.html show when I type localhost:8280/persistence-with-jdbc2/...
this is the basic of the servlet:
#WebServlet(urlPatterns = "/PersistenceWithJDBCServlet2")
public class PersistenceWithJDBCServlet2 extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final Logger LOGGER =
LoggerFactory.getLogger(PersistenceWithJDBCServlet2.class);
private PersonDAO personDAO;
#Override
public void init() throws ServletException {
System.out.println("init");
}
#Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
//What can I use here?
}
#Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
try {
// test code
} catch (Exception e) {
response.getWriter().println(
"Persistence operation failed with reason: "
+ e.getMessage());
LOGGER.error("Persistence operation failed", e);
}
}
}
and the web.xml content:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web- app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>persistence-with-jdbc2</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>PersistenceWithJDBCServlet2</display-name>
<servlet-name>PersistenceWithJDBCServlet2</servlet-name>
<servlet-class>com.sap.cloud.sample.persistence.PersistenceWithJDBCServlet2</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PersistenceWithJDBCServlet2</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<resource-ref>
<res-ref-name>jdbc/DefaultDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
</resource-ref>
</web-app>
Thanks for your time!
You can just redirect it to what ever webadress you want.
#Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.sendRedirect("/yourwebAdress/index.html");
}
I thing you are creating the index page like index.jsp and put this following sample code like as:
<body>
<jsp:forward page="/UserController?action=listUser" />
</body>
And call this index page in the web.xml page, like
<display-name>Simple1</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>UserController</display-name>
<servlet-name>UserController</servlet-name>
<servlet-class>com.pro3.controller.UserController</servlet-class>
</servlet>
And add this one in controller page:
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
String forward="";
String action = request.getParameter("action");
I am getting this "HTTP method POST is not supported by this URL" error when I run my project. The funny thing is, it was running perfectly fine two days ago. After I made a few changes to my code but then restored my original code and its giving me this error. Could you please help me?
Here is my index.html:
<form method="post" action="login.do">
<div>
<table>
<tr><td>Username: </td><td><input type="text" name="e_name"/>
</td> </tr>
<tr><td> Password: </td><td><input type="password" name="e_pass"/>
</td> </tr>
<tr><td></td><td><input type="submit" name ="e_submit" value="Submit"/>
Here is my Login servlet:
public class Login extends HttpServlet {
/**
* Processes requests for both HTTP
* <code>GET</code> and
* <code>POST</code> methods.
*
* #param request servlet request
* #param response servlet response
* #throws ServletException if a servlet-specific error occurs
* #throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/*
* TODO output your page here. You may use following sample code.
*/
int status;
String submit = request.getParameter("e_submit");
String submit2 = request.getParameter("a_submit");
out.println("Here1");
String e_name = request.getParameter("e_name");
String e_password = request.getParameter("e_pass");
String a_name = request.getParameter("a_name");
String a_password = request.getParameter("a_pass");
out.println(e_name+e_password+a_name+a_password);
Author author = new Author(a_name,a_password);
Editor editor = new Editor(e_name,e_password);
// If it is an AUTHOR login:
if(submit==null){
status = author.login(author);
out.println("Author Login");
//Incorrect login details
if(status==0) {
out.println("Incorrect");
RequestDispatcher view = request.getRequestDispatcher("index_F.html");
view.forward(request, response);
}
//Correct login details --- AUTHOR
else {
out.println("Correct login details");
HttpSession session = request.getSession();
session.setAttribute(a_name, "a_name");
RequestDispatcher view = request.getRequestDispatcher("index_S.jsp");
view.forward(request, response);
}
}
//If it is an EDITOR login
else if (submit2==null){
status = editor.login(editor);
//Incorrect login details
if(status==0) {
RequestDispatcher view = request.getRequestDispatcher("index_F.html");
view.forward(request, response);
}
//Correct login details --- EDITOR
else {
out.println("correct");
HttpSession session = request.getSession();
session.setAttribute(e_name, "e_name");
session.setAttribute(e_password, "e_pass");
RequestDispatcher view = request.getRequestDispatcher("index_S_1.html");
view.forward(request, response);
} }
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
#Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doPost(req, resp);
}
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doGet(req, resp);
}}
And my web.xml looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>controller.Login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/login.do</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
I use Glassfish v3 server - let me know anything else you need to know
That's because on your doGet() and doPost() method, you're calling it's super methods. Rather, call the processRequest() inside the respective methods mentioned above.
The super.doGet() and super.doPost() method, returns an HTTP 405, by default, so you don't call your superclass doGet() and doPost().
Why is there a processRequest method in your code? Who will call that method?
You can't get up to that method by calling super.doGet() or super.doPost()
you need to call that method explicitly.
#Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
processRequest(req,resp)
}
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
processRequest(req,resp)
}
EDIT
Do this
response.sendRedirect("index_F.html");
return;
instead of
RequestDispatcher view = request.getRequestDispatcher("index_F.html");
view.forward(request, response);
Inside doPost() you have to call processRequest().
You're calling doGet() and doPost() method without actually implementing (using super).
The HttpServlet basically follows the template method pattern where all non-overridden HTTP methods returns a HTTP 405 error "Method not supported". When you override such a method, you should not call super method, because you would otherwise still get the HTTP 405 error. The same story goes on for your doPost() method.
Call the processRequest(req,resp) inside the respective methods mentioned above.
EDIT:
Second,
Do not use dispatcher to forward request to HTML. Use redirect anyway if you want to show html only.
response.sendRedirect("index_F.html");
return;
Also, It is good practice to use redirect when you do Logout or send back for invalid credentials.