如何使用Java代码检查客户端浏览器中是否启用了JavaScript [英] How to check whether JavaScript is enabled in client browser using Java code

问题描述

任何人都可以帮我尝试使用Java代码检查客户端浏览器中是否启用了JavaScript。

can anyone help me in trying to check whether JavaScript is enabled in client browser using Java code.

推荐答案

假设你'重新编写Java Web应用程序，我成功使用的一种技术是访问第一个页面—通常是登录表单—在页面加载时编写会话cookie。然后使用表单提交的Java代码来检查该cookie是否存在。

Assuming you're writing a Java web application, one technique that I've used successfully is to have the first page that's accessed—typically a login form—write a session cookie when the page loads. Then have the Java code that the form submits to check for the existence of that cookie.

在客户端：

<script type="text/javascript">
  function createCookie(name, value, days) {
    var expires = "";
    if (days) {
      var date = new Date();
      date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
      expires = "; expires=" + date.toGMTString();
    }
    var cookie = name + "=" + value + expires + "; path=" + "/";
    document.cookie = cookie;
  }
  createCookie("JavaScriptEnabledCheck", 1, 0);
</script>

在服务器上：

/**
 * Returns <code>true</code> if the session cookie set by the login form
 * is not present.
 * 
 * @param request The HTTP request being processed
 * @return <code>true</code> if JavaScript is disabled, otherwise <code>false</code>
 */
private boolean isJavaScriptDisabled(HttpServletRequest request)
{
  boolean isJavaScriptDisabled = true;
  Cookie[] cookies = request.getCookies();

  if (cookies != null)
  {
    for (int i = 0; i < cookies.length; i++)
    {
      if ("JavaScriptEnabledCheck".equalsIgnoreCase(cookies[i].getName()))
      {
        isJavaScriptDisabled = false;
        break;
      }
    }
  }

  return isJavaScriptDisabled;
}

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