How do I read cookie in Servlet? - Learn Java by Examples

package org.kodejava.servlet;

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 java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "ReadCookieServlet", urlPatterns = "/read-cookie")
public class ReadCookieExample extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request,
                          HttpServletResponse response) throws IOException {
        response.setContentType("text/html");
        PrintWriter writer = response.getWriter();

        Cookie[] cookies = request.getCookies();
        for (Cookie cookie : cookies) {
            writer.println("Name: " + cookie.getName() + "; Value: " + cookie.getValue());
        }
    }
}

An example result of the servlet above is:

Name: username; Value: jduke 
Name: JSESSIONID; Value: AE819A3F74E3700838ADFC99485216DF

Maven dependencies

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.1</version>
</dependency>

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Wayan

Founder at Kode Java

Hi, I'm a passionate programmer based on the beautiful island of Bali. I specialize in Java, with hands-on experience in Spring, Hibernate/JPA, and MySQL. I'm currently working on a project I care deeply about, and your support—big or small—helps fuel my work (and my coffee ☕️).

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