myfaces htmlHead 未首先呈现

Question

我已经开始维护遗留的 JSF 应用程序。它使用 myFaces 1.1.x 和 tomahawk 1.1.6。我需要打印 META 标签 X-UA-Compatible 作为 HEAD 元素的第一个元素，否则 IE 将忽略它。

<%@page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>
<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="t" uri="http://myfaces.apache.org/tomahawk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <f:view>
    <t:documentHead>
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta http-equiv="Content-type" content="text/html; charset=UTF-8">

会生成

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
<script type="text/javascript" src="/Viewer/faces/myFacesExtensionResource/org.apache.myfaces.renderkit.html.util.MyFacesResourceLoader/15311471/navmenu.jscookmenu.HtmlJSCookMenuRenderer/JSCookMenu.js"><!--
//--></script>
<script type="text/javascript" src="/Viewer/faces/myFacesExtensionResource/org.apache.myfaces.renderkit.html.util.MyFacesResourceLoader/15311471/navmenu.jscookmenu.HtmlJSCookMenuRenderer/MyFacesHack.js"><!--
//--></script>
<script type="text/javascript"><!--
var myThemeMiniBlackBase='/Viewer/faces/myFacesExtensionResource/org.apache.myfaces.renderkit.html.util.MyFacesResourceLoader/15311471/navmenu.jscookmenu.HtmlJSCookMenuRenderer/ThemeMiniBlack/';
//--></script>
<script type="text/javascript" src="/Viewer/faces/myFacesExtensionResource/org.apache.myfaces.renderkit.html.util.MyFacesResourceLoader/15311471/navmenu.jscookmenu.HtmlJSCookMenuRenderer/ThemeMiniBlack/theme.js"><!--
//--></script>
<link rel="stylesheet" href="/Viewer/faces/myFacesExtensionResource/org.apache.myfaces.renderkit.html.util.MyFacesResourceLoader/15311471/navmenu.jscookmenu.HtmlJSCookMenuRenderer/ThemeMiniBlack/theme.css" type="text/css" />
<script type="text/javascript" src="/Viewer/faces/myFacesExtensionResource/org.apache.myfaces.renderkit.html.util.MyFacesResourceLoader/15311471/popup.HtmlPopupRenderer/JSPopup.js"><!--
//--></script>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta http-equiv="Content-type" content="text/html; charset=UTF-8">

如何强制 META 标签成为第一个元素？我尝试了普通的 HTML HEAD 元素，但它也没有用。

我需要

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta http-equiv="Content-type" content="text/html; charset=UTF-8">

更新：

其中一些 javascripts 和样式是由于此标记而呈现的：

<t:jscookMenu theme="ThemeMiniBlack" layout="hbr" immediate="true">

剩下的javascript来自

<t:popup closePopupOnExitingElement="true" closePopupOnExitingPopup="true"
         displayAtDistanceX="10" displayAtDistanceY="20" styleClass="popup">

问题是我是否可以强制我放入 t:documentHead 的内容具有优先权？我担心我需要编写自定义标签。

Answer 1

我会尝试在自定义 java 过滤器中自己添加元标记。

<filter>
   <filter-name>MetaTagsFilter</filter-name>
   <filter-class>com.yournamespace.MetaTagsFilter</filter-class>
</filter>

然后为 JSF servlet 做一个过滤器映射：

<filter-mapping>
   <filter-name>MetaTagsFilter</filter-name>
   <servlet-name>FacesServlet</servlet-name>
</filter-mapping>

<servlet-mapping>
  <servlet-name>FacesServlet</servlet-name>
  <url-pattern>*.faces</url-pattern>
</servlet-mapping>

在您的过滤器逻辑中，添加元标记，在 servlet 执行处理后，类似这样：

@Override
public void doFilter(ServletRequest request, ServletResponse response,
        FilterChain filterChain) throws IOException, ServletException {

    HtmlResponseWrapper capturingResponseWrapper = new HtmlResponseWrapper(
            (HttpServletResponse) response);

    filterChain.doFilter(request, capturingResponseWrapper);

    if (response.getContentType() != null
            && response.getContentType().contains("text/html")) {


        // Try this 
        capturingResponseWrapper.addHeader("X-UA-Compatible", "IE=edge");


        // Or this, that way you have more control over WHERE it gets written
        String content = capturingResponseWrapper.getCaptureAsString();

        // replace stuff here (find the <head></head> tags and add the <meta> at the very beginning)

        System.out.println(replacedContent);

        response.getWriter().write(replacedContent);

    }

}

另请参阅：

Modify html response using filter
Is doFilter() executed before or after the Servlet's work is done?
What is the difference between creating JSF pages with .jsp or .xhtml or .jsf extension
The Essentials of Filters (Oracle)

myfaces htmlHead 未首先呈现

myfaces htmlHead is not rendered first

jsf

myfaces

tomahawk

jsf-1.1