如何使用Java和JavaScript限制用户仅在一个选项卡/窗口中登录？

我的要求是给予访问权限，就像每个用户一次登录一样，为此，我已将登录状态更新为db（在用户登录时为db），在用户注销时为false。但是问题是当用户关闭窗口而不注销时。

为了处理窗口关闭，我实现了以下js代码

 var validNavigation = false;

 function wireUpEvents() {

  var dont_confirm_leave = 0; 
   var leave_message = 'You sure you want to leave?'
  function goodbye(e) {
    if (!validNavigation) {
     if (dont_confirm_leave!==1) {
         if(!e) e = window.event;
       //e.cancelBubble is supported by IE - this will kill the bubbling process.
       e.cancelBubble = true;
        e.returnValue = leave_message;
       //e.stopPropagation works in Firefox.
        if (e.stopPropagation) {
         e.stopPropagation();
         e.preventDefault();
          }
        //return works for Chrome and Safari
        return leave_message;
      }

      window.location = "logout.jsp";
    }
  }
  window.onbeforeunload=goodbye;

   // Attach the event keypress to exclude the F5 refresh
  $(document).bind('keypress', function(e) {
    if (e.keyCode == 116){
      validNavigation = true;
    }
  });

  // Attach the event click for all links in the page
  $("a").bind("click", function() {
    validNavigation = true;
  });

  // Attach the event submit for all forms in the page
  $("form").bind("submit", function() {
    validNavigation = true;
  });

   // Attach the event click for all inputs in the page
  $("input[type=submit]").bind("click", function() {
    validNavigation = true;
  });

  // Attach the event click for all inputs in the page
 $("input[type='button']").bind("click", function() {
   validNavigation = true;
 });

}

// Wire up the events as soon as the DOM tree is ready
$(document).ready(function() {
 wireUpEvents();
});

在这里它适用于窗口关闭，这意味着如果用户关闭窗口，它将转到注销页面，但是问题是，当用户重新加载页面时，它正要注销页面。

因此，我还需要像上述f5的js代码一样绑定reload事件，并提交和锚定标签。

在这方面，请帮助我。

提前致谢...