Question

我的问题是，当我运行一个非常简单的JSF应用程序时，EL标签不会被渲染。

例如，此代码：

<html lang="en" xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html">
<h:head>
    <title>Facelets Hello World</title>
</h:head>
<h:body> #{hello.world} </h:body>
</html>

在浏览器中显示为#{hello.word}，而不是“Hello World！”应该由我的托管bean返回：

@ManagedBean(name = "hello")
public class Hello {
    public String getWorld() {
        return "Hello World!";
    }
}

我已经看到了这个问题JSF 2.0 EL tags don't render in browser，但它对我没有帮助。而且，根据我所读到的，Tomcat 7声称提供API和EL 2.2标准的实现。

我正在使用以下软件/版本：

Eclipse Indigo 3.7.2 Java EE版
Eclipse插件：m2e 1.0.2
Eclipse插件：m2e-wtp 0.15.2
Maven 2
Tomcat 7（尝试过以下版本）
- Tomcat 7.0.10
- Tomcat 7.0.26
- Tomcat 7.0.27
MyFaces 2.1.6
Oracle JDK 1.7.0

如果需要更多信息，我很乐意提供。

[EDIT1]

我甚至不确定这是否必要/正确，但将以下内容添加到web.xml并没有解决问题：

<context-param>
    <param-name>org.apache.myfaces.EXPRESSION_FACTORY</param-name>
    <param-value>org.apache.el.ExpressionFactoryImpl</param-value>
</context-param>

[EDIT2]

的web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">
    <display-name>jsf-facelets</display-name>
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>
    <context-param>
        <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
        <param-value>.xhtml</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.EXPRESSION_FACTORY</param-name>
        <param-value>org.apache.el.ExpressionFactoryImpl</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION</param-name>
        <param-value>20</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.COMPRESS_STATE_IN_SESSION</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.COMPRESS_STATE_IN_CLIENT</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.SECRET</param-name>
        <param-value>NzY1NDMyMTA=</param-value>
    </context-param>
    <listener>
        <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
    </listener>
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>
</web-app>

Answer 1

您应该使用.html扩展程序访问您的网页：myPage.html

servlet-mapping的原因

<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.html</url-pattern>
</servlet-mapping>

EL标签未呈现

1 个答案: