How do I delete a character from a Cookie or create whitespace?

Question

I've created a site that displays the weather of every city using an API from openweather.

I managed to solve a problem I had where the previous searches wouldn't show up using cookies. This is for a school project that requires that I use cookies.

My problem now is that I can't create whitespace between the previous searches. I keep getting the error.

java.lang.IllegalArgumentException: An invalid character [32] was present in the Cookie value

The only characters that can be used are colon and hyphen as far as the ones I've tried. I read that colon and whitespace used to be accepted on an earlier tomcat, but not anymore. I'm on 9.0.69.

I've uploaded a picture, so you can see the end result. How do I create a white space between the cities or better yet a list that goes downwards.

This is my servlet;

package controller;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import model.GettheWeather;
import model.weatherBean;

@WebServlet("/OWservlet")
public class OWservlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String cityStr = request.getParameter("city");
        String countryStr = request.getParameter("country");

        weatherBean wBean = new weatherBean(cityStr, countryStr);

        GettheWeather.getWeather(wBean);

        request.setAttribute("wBean", wBean);

        Cookie[] cookies = request.getCookies();
        String temp = "";
        for (int i = 0; i < cookies.length; i++) {
            if (cookies[i].getName().equals("city")) {
                temp = cookies[i].getValue();
            }

        }

        temp = temp + "-" + cityStr;
        

        Cookie ck = new Cookie("city", temp);
        ck.setMaxAge(100);
        response.addCookie(ck);

        RequestDispatcher rd = request.getRequestDispatcher("views/showWeather.jsp");
        rd.forward(request, response);
    }

}

and this is my JSP

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@page import="model.weatherBean"%>
<%@page import="controller.OWservlet"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>the weather</title>
<link rel="stylesheet" href="./style.css">
</head>
<body>

    <%
    
    weatherBean wBean = (weatherBean) request.getAttribute("wBean");

    double number = Double.parseDouble(wBean.getTempStr());
    number = number - 273.15;
    int number2 = (int) number;

    out.print("<h2>The weather in " + wBean.getCityStr() + " is now  " + wBean.getCloudsStr() + ", the temperature is : "
            + number2 + "°C, and the date is: " + wBean.getTimeStr().substring(0, 10) + "</h2>");
    %>

    <div class="loginbox">
        <form action="OWservlet" method="get">
            City:<input type="text" name="city" /><br /> Country:<input
                type="text" name="country" /><br /> <input type="submit"
                value="go" />
        </form>
    </div>

    <h1>Previously searched cities: ${cookie["city"].getValue()}</h1>

    
    

</body>
</html>

I've tried using

temp.split("-");

and

temp.replace("-"," ")

How do I delete a character from a Cookie or create whitespace?

0 Answers0