Question

我刚开始使用JSF并尝试一些示例实现。我得到了以下Bean，web.xml和index.xhtml文件：

HelloBean.java：

package jsflearning;

import javax.inject.Named;
import javax.enterprise.context.*;

@Named(value= "myHelloBean")
@RequestScoped
public class HelloBean {
    private String name = "dear reader";

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return this.name;
    }
}

的web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1"
         xmlns="http://java.sun.com/xml/ns/javaee" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
         http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd">

    <display-name>JSFLearning</display-name>
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.xhtml</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>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

的index.xhtml：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
          "http://www.w3.org/TR/xhtml11/DTD/xhtml11-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html">
<head>
<title>Simplest JSF Page</title>
</head>
<body>
    <div align="center">
    <br />
    <h:form>
    <h:inputText value="#{myHelloBean.name}"/>
    </h:form>
    <br />
    Hello to you. #{myHelloBean.name} !
    </div>
</body>
</html>

#{myHelloBean.name}表达式已正确执行，但未解释<h:form>标记且未显示编辑框。无法找到此问题的解决方案。提前谢谢！

Answer 1

仅在JSF 2.2之后才支持http://xmlns.jcp.org/jsf/* XML命名空间。您的问题症状表明您仍在使用JSF 2.0或2.1。

你有两个选择：

将JSF库升级到JSF 2.2兼容版本。
将XML命名空间降级为兼容JSF 2.0 / 2.1 http://java.sun.com/jsf/*。

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