如何在JAVA中获取Internet Explorer的文档模式

Question

I am trying to fetch the document mode of the browser ie IE from the given function.I knew that in javascript we can use document.documentMode to fetch the doucment mode of IE. But is there any way to do it in java ? I have the userAgent string fro the HttpServletRequest ,but I cannot use it to fetch the document mode.I have used ScriptEngine to execute the javascript inside the java code ,but It is giving exception that the document element is not defined.Kindly help please

 ScriptEngine engine = 
            new ScriptEngineManager().getEngineByName("javascript");
    String docversio = null;
    String script = "function documentversion() { return document.documentMode }";
    try {
         engine.eval(script);

         Invocable inv = (Invocable)engine;

        try {
            docversio = (String) inv.invokeFunction("documentversion");
        } catch (NoSuchMethodException e) {
            System.out.println("No such method");
            e.printStackTrace();
        } 

        if(null != docversio)
        System.out.println("the document version is "+docversio);
    } catch (ScriptException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Answer 1

What you are doing here executes JavaScript on the server side. What you need is JavaScript on the client's browser. One way to achieve what you want is to pass on the documentMode as a URL param. This will be available on the server.

<script>
$(document).ready(function(){
if ( document.referrer == null || document.referrer.indexOf(window.location.hostname) < 0 ) {
   window.location.href = window.location.href + "?documentMode=" + document.documentMode;
}
});
</script>

Now the URL param documentMode will be available with request.getParameter("documentMode")

Answer 2

public class DocumentModeOfIE extends HttpServlet {
  private String documentMode;

  public void init(ServletConfig config) throws ServletException {    }

  public void doGet(HttpServletRequest req, HttpServletResponse resp) 
       throws ServletException, IOException {
    PrintWriter out = resp.getWriter();
    resp.setContentType("text/html");
    documentMode = req.getHeader("X-UA-Compatible");
    out.println(documentMode);
  }

  public void destroy() {  }

}