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谁能指导我一个简单的例子（代码）显示使用response.encodeURL()？encodeURL()我所有的搜索（谷歌和stackoverflow）只提供和之间的区别encodeRedirectURL().

我正在寻找一些简单的代码来展示如何将会话信息嵌入链接中。

谢谢，杰夫

4

3 回答 3

2

考虑这个：

public void doGet (HttpServletRequest req, HttpServletResponse res)
        throws ServletException, IOException {

    // Get the session object. Create a new one if it doesn't exist.
    HttpSession session = req.getSession(true);

    res.setContentType("text/html");
    PrintWriter out = res.getWriter();

    out.println("<head><title> " + "SessionServlet Output " +
                "</title></head><body>");
    out.println("<h1> SessionServlet Output </h1>");

    // Set up a session hit counter. "sessionservlet.counter" is just the
    // conventional way to create a key for the value to be stored in the
    // session object "dictionary".
    Integer ival = 
      (Integer) session.getAttribute("sessionservlet.counter");
    if (ival == null) {
      ival = new Integer(1);
    }
    else {
      ival = new Integer(ival.intValue() + 1);
    }

    // Save the counter value.
    session.setAttribute("sessionservlet.counter", ival);

    // Report the counter value. 
    out.println(" You have hit this page <b>" + 
                ival + "</b> times.<p>");

    // This statement provides a target that the user can click
    // to activate URL rewriting. It is not done by default.
    out.println("Click <a href=" + 
                res.encodeURL(HttpUtils.getRequestURL(req).toString()) + 
                ">here</a>");
    out.println(" to ensure that session tracking is working even " +
                "if cookies aren't supported.<br>");
    out.println("Note that by default URL rewriting is not enabled" +
                " due to its large overhead.");

    // Report data from request.
    out.println("<h3>Request and Session Data</h3>");
    out.println("Session ID in Request: " +
                req.getRequestedSessionId());
    out.println("<br>Session ID in Request is from a Cookie: " +
                req.isRequestedSessionIdFromCookie());
    out.println("<br>Session ID in Request is from the URL: " +
                req.isRequestedSessionIdFromURL());
    out.println("<br>Valid Session ID: " +
                req.isRequestedSessionIdValid());

    // Report data from the session object.
    out.println("<h3>Session Data</h3>");
    out.println("New Session: " + session.isNew());
    out.println("<br> Session ID: " + session.getId());
    out.println("<br> Creation Time: " + new Date(session.getCreationTime()));
    out.println("<br>Last Accessed Time: " +
                new Date(session.getLastAccessedTime()));
    out.println("</body>");
    out.close();
  }

参考

于 2014-11-30T14:59:02.400 回答
2

检查这些链接：

一些背景资料：

http://www.coderanch.com/t/366059/Servlets/java/encodeURL-purpose-place

代码示例：

http://www.javadocexamples.com/javax/servlet/http/HttpServletResponse/encodeURL%28String%20url%29.html

于 2013-10-25T00:00:38.170 回答
1

当客户端在浏览器上禁用 cookie 时，容器将无法使用 cookie 管理会话。届时，如果 cookie 不可用，Container 将自动使用 URL 重写。但是仍然需要告诉容器“将 jsessionid 附加到 url 的末尾”。因此，response.encodeURL()用于添加jsessionid到 URL

HeadFirst 电子书的代码片段

于 2021-09-03T17:15:55.127 回答