Java 客戶端
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class NewClass {

    public static void main(String[] args) throws Exception {

        URL url = new URL("http://127.0.0.1/CookieTest");
        URLConnection conn = url.openConnection();
        // 寫入 Cookie
        conn.setRequestProperty("Cookie", "loli=Moe;who=God;");
        // 連線
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.connect();
        
        //
        OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
        wr.write("e_mail=my@loli.com&password=yayaya"); // 輸入信箱與密碼
        wr.flush();

        //-----------------------------------------------------
        System.out.println("------------- Server 回傳標頭 -------------------------------");

        //get all headers
        Map<String, List<String>> map = conn.getHeaderFields();
        for (Map.Entry<String, List<String>> entry : map.entrySet()) {

            System.out.println("Key : " + entry.getKey() + " ,Value : " + entry.getValue());

        }


        System.out.println("------------- 伺服器種類 ---------------");

        //get header by 'key'
        String server = conn.getHeaderField("Server");
        System.out.println(server);

        System.out.println("------------- 兩種 Cookie ---------------");

        HttpURLConnection httpConn = (HttpURLConnection) conn; // 回傳使用

        String cookie = conn.getRequestProperty("Cookie");     // 客戶端原先的 Cookie
        String requestCookie = conn.getHeaderField("Set-Cookie"); // 伺服器要求新寫入的

        System.out.println("Cookies : " + cookie);
        System.out.println("Request Cookies : " + requestCookie);

        System.out.println("------------- Server 回傳訊息 ---------------");
        //-----------------------------------------------------

        try (InputStreamReader in = new InputStreamReader(httpConn.getInputStream());
                BufferedReader br = new BufferedReader(in);) {

            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }

        }
    }
}


//-----------------------------------------------------------------------------------------------------
Web 伺服器 Servlet ( 例如 : Tomcat )


import java.io.IOException;

import java.io.PrintWriter;
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;


@WebServlet("/CookieTest")
public class CookieTest extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/plain;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {

            String e_mail = request.getParameter("e_mail");

            String password = request.getParameter("password");

            if (e_mail.equals("my@loli.com") && password.equals("yayaya")) {
                int cookieAge = 24 * 60 * 60; // 1 Day
                Cookie status = new Cookie("status", "You_Already_To_Sign");
                status.setMaxAge(cookieAge);
                response.addCookie(status);

                out.println("登入成功  !");
                out.println();

            } else {
                out.println("登入失敗 !  請檢查信箱與祕法是否輸入錯誤 !?");
                out.println();
            }

            for (Cookie c : request.getCookies()) {
                out.println("Name : " + c.getName());
                out.println("Value : " + c.getValue());
                out.println();
            }

        }
    }

}

//-----------------------------------------------------------------------------
Java 客戶端執行結果

------------- Server 回傳標頭 -------------------------------

Key : null ,Value : [HTTP/1.1 200 OK]
Key : Server ,Value : [Apache-Coyote/1.1]
Key : Set-Cookie ,Value : [status=You_Already_To_Sign; Expires=Tue, 27-Oct-2015 18:02:37 GMT]
Key : Content-Length ,Value : [66]
Key : Date ,Value : [Mon, 26 Oct 2015 18:02:37 GMT]
Key : Content-Type ,Value : [text/plain;charset=UTF-8]
------------- 伺服器種類 ---------------
Apache-Coyote/1.1
------------- 兩種 Cookie ---------------
Cookies : loli=Moe;who=God;
Request Cookies : status=You_Already_To_Sign; Expires=Tue, 27-Oct-2015 18:02:37 GMT
------------- Server 回傳訊息 ---------------
登入成功  !

Name : loli
Value : Moe

Name : who
Value : God








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