没关系,我找到了.我用 :
final HttpServletRequest request =(HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest();
final String userAgent = request.getHeader("user-agent");
System.out.println(userAgent);
谢谢您的帮助.
它在User-Agenthttp标头中发送.
HttpServletRequest request = (HttpServletRequest)context.getExternalContext().getRequest();
String userAgent = request.getHeader("user-agent");
在JSF2页面中,您可以通过请求对象直接打印用户代理:
<h:outputText value="#{request.getHeader('user-agent')}" />
但是别忘了使用h-namespace ;-)
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html">
然后,您可以通过功能响应不同的浏览器.
例:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:fn="http://java.sun.com/jsp/jstl/functions">
<h:head>
<title>Facelet Title</title>
</h:head>
<h:body>
<p>
User-Agent: <h:outputText value="#{request.getHeader('user-agent')}" />
</p>
<h:panelGroup rendered="#{fn:containsIgnoreCase(request.getHeader('User-Agent'), 'Firefox')}">
<p>
Hello Firefox!
</p>
</h:panelGroup>
</h:body>
</html>
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