JQuery jsession cookie不会发送到服务器 [英] JQuery jsession cookie is not sent to a server

问题描述

我搜索过jquery forum，stackoverflow，google，bing，甚至yahoo w / o成功。
每10秒我试图通过这个JQuery片段从logservlet servlet加载文本数据：

 < script type =text / javascriptsrc =http://code.jquery.com/jquery-1.7.2.min.js>< / script> 
< script type =text / javascript> 
 var autorefresh = setInterval（function（）{
 $ .ajax（{
 url：logservlet？devkey = chat，
 success：function（data）{
 $（＃log_ta）。append（data）; 
} 
}）; 
}，10000）; 
< / script> 
  

问题是，在服务器端我看不到有效的会话，会话属性。问题似乎与在JQuery的http请求的头中缺少Cookie JSESSIONID = xxxxxxxxxxxxxxxxxxxxxxxxxxx相关。我从服务器获取响应头，其中JSESSIONID总是随着每个请求而变化：

 服务器Apache-Coyote / 1.1 
 Set-Cookie JSESSIONID = 9EEAFA2A933E7742D8FEDADD5345B76D; Path = / CumulusServer 
 Content-Length 0 
 Date Fri，23 Mar 2012 13:02:08 GMT 
  

但是JQuery不会随后使用它，这里是请求头：

 主机192.168.1.11 ：8080 
用户代理Mozilla / 5.0（Windows NT 5.1; rv：5.0）Gecko / 20100101 Firefox / 5.0 
接受* / * 
接受语言en-us，en; q = 0.5 
 Accept-Encoding gzip，deflate 
 Accept-Charset ISO-8859-1，utf-8; q = 0.7，*; q = 0.7 
连接保持活动
 X -Requested-With XMLHttpRequest 
 Referer http://192.168.1.11:8080//CumulusServer/ 
  

这里有什么问题？ $ .ajax调用不能识别会话吗？或者，我错过了一些管道代码在每个ajax请求中手动硬编码JSESSIONID？是这样，这应该是什么样子？ Btw，当我从网络浏览器调用相同的url JSESSIONID头被发送到服务器！

谢谢，
D。

解决方案

确实我运行Adblock Plus，（感谢提示），但它与这无关。
其实这件事有点棘手。我找到了两个解决方案，但我没有解释发生了什么。

解决方案＃1： - 在网页加载时手动保存JSESSIONID ：

  var Session = {
 id：'$ {pageContext.session.id}'，
 user：'$ {pageContext.request.remoteUser}'
}; 
 
 $（window）.load（function（）{
 setCookie（'JSESSIONID'，Session.id）; 
}）; 
 
函数setCookie（name，value，expires，path，domain，secure）{
 var cookieString = name +=+ escape（value）+ 
 ？; expires =+ expires.toGMTString（）：）+ 
（（path）？; path =+ path：）+ 
 =+ domain：）+ 
（（secure）？; secure：）; 
 document.cookie = cookieString; 
} 
  

这样工作正常，JSESSIONID在下一个ajax请求中发送。解决方案＃2： - 在servlet doGet（）方法中添加text / plainmime类型。p>

<
最初在我的测试中，我没有设置任何内容类型。在我意识到JQuery默认情况下期望XML响应，我改变了我的服务器doGet（）方法来显式设置内容类型如下：

resp.setContentType / plain）;

现在，ajax调用也很好，实际上不需要手动进行cookie管理。我没有解释为什么解决方案＃2工作，但它是。

谢谢，
D。

I've searched jquery forum, stackoverflow, google, bing, and even yahoo w/o success. Every 10 sec I'm trying to load a text data from logservlet servlet via this JQuery snippet:

    <script type="text/javascript" src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
    <script type="text/javascript">
            var autorefresh = setInterval(function () {
                $.ajax({
                    url : "logservlet?devkey=chat",
                    success : function(data) {
                        $("#log_ta").append(data);
                    }
                });
                }, 10000);
    </script>

The problem is, on a server side I don't see a valid session where I try to track the session attributes. The problem seems to be related to missing "Cookie JSESSIONID=xxxxxxxxxxxxxxxxxxxxxxxxxxx" in the header of the http requests from JQuery. I'm getting response headers from the server, with JSESSIONID always changing with each request:

    Server  Apache-Coyote/1.1
    Set-Cookie  JSESSIONID=9EEAFA2A933E7742D8FEDADD5345B76D; Path=/CumulusServer
    Content-Length  0
    Date    Fri, 23 Mar 2012 13:02:08 GMT

But JQuery doesn't use it subsequently, here are the request headers:

    Host    192.168.1.11:8080
    User-Agent  Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20100101 Firefox/5.0
    Accept  */*
    Accept-Language en-us,en;q=0.5
    Accept-Encoding gzip, deflate
    Accept-Charset  ISO-8859-1,utf-8;q=0.7,*;q=0.7
    Connection  keep-alive
    X-Requested-With    XMLHttpRequest
    Referer http://192.168.1.11:8080//CumulusServer/

What's the issues here? Are "$.ajax" calls not session aware? Or do I miss some plumbing code to hardcode the JSESSIONID manually in each ajax request? Is so, how this should look like? Btw, when I call the same url from web browser the JSESSIONID header is sent to the server!

Thanks, D.

解决方案

Indeed I do run Adblock Plus, (thanks for the tip) but it has nothing to do with this. Actually the thing is a bit tricky. I found two solutions, but I don't have explanation what is going on.

Solution #1: - saving JSESSIONID manually when page loads:

    var Session = {
       id : '${pageContext.session.id}',
       user : '${pageContext.request.remoteUser}'
    };

    $(window).load(function () {
        setCookie('JSESSIONID',Session.id);
    });

    function setCookie(name,value,expires,path,domain,secure) {
        var cookieString = name + "=" +escape(value) +
           ( (expires) ? ";expires=" + expires.toGMTString() : "") +
           ( (path) ? ";path=" + path : "") +
           ( (domain) ? ";domain=" + domain : "") +
           ( (secure) ? ";secure" : "");
        document.cookie = cookieString;
    }

This works fine and JSESSIONID gets send over in next ajax requests accordingly.

Solution #2: - Adding "text/plain" mime type in servlet doGet() method. Initially in my test I have not set any content type at all. After I realized that JQuery is expecting XML response by default, I changed my server doGet() method to set the content type explicitly like so:

resp.setContentType("text/plain");

Now, ajax call works fine too, and no manual cookie management is needed actually. I don't have explanation why Solution #2 works, but it is.

Thanks, D.

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