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我正在通过 servlet 试验 cookie。当我通过 javascript 向该 servlet 发出请求时，响应标头具有set-cookie，但是在向同一域上的同一 servlet 或其他 servlet 发出后续请求时，请求标头没有cookie标头。我已经粘贴了下面的实验代码，请让我知道我哪里出错了。

package com.java.servlet;

import java.io.IOException;

@SuppressWarnings("serial")
public class ServletTest extends HttpServlet {

    public void init() throws ServletException {

    }

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

        // Create cookies for first and last names.
        Cookie userId = new Cookie("userId",
                request.getParameter("userId"));
        // Set expiry date after 24 Hrs for both the cookies.
        userId.setMaxAge(60 * 60 * 24);

        // Add both the cookies in the response header.
        response.addCookie(userId);
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Allow-Credentials", "false");
        response.addHeader("Access-Control-Allow-Headers", "Origin, Content-Type, Accept, Cookie");
        response.addHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT, OPTIONS");

        response.setContentType("application/json");
        PrintWriter pw = response.getWriter();

        List<String> ls = new ArrayList<String>();
        ls.add("111");
        ls.add("aaa");
        pw.print(ls);   //some random data

    }

    public void destroy() {

    }
}

我使用的 javascript 直接来自 w3schools 的 xmlHttpRequest。我贴在下面

<!DOCTYPE html>
<html>

<head>
    <script>
        function loadXMLDoc() {
            var xmlhttp;
            if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari
                xmlhttp = new XMLHttpRequest();
            }
            xmlhttp.onreadystatechange = function () {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
                }
            }
            xmlhttp.open("GET", "http://192.168.1.10:8080/ServletTest/servlet", true);
            xmlhttp.send();
        }
    </script>
</head>

<body>
    <button type="button" onclick="loadXMLDoc()">Request data</button>
        <div id="myDiv"></div>

</body>

</html>

我注意到 cookie 没有存储在这个 servlet 的浏览器 cookie 存储中。帮帮我

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0 回答 0