JSF bean 未在 *.xhtml 页面上解释

Question

我正在尝试在我的 Maven 项目中使用 Spring Boot 配置 JSF/primefaces。我正在关注这个例子https://github.com/stephanrauh/JSF-on-Spring-Boot，效果很好。

问题：应用程序运行时，JSF 视图显示时没有来自后端的数据。

这是我的 *.java 类：

@Configuration
public class WebInitializer extends SpringBootServletInitializer implements ServletContextAware {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    @Bean
    public DispatcherServlet dispatcherServlet() {
        DispatcherServlet dispatcherServlet = new DispatcherServlet();
        dispatcherServlet.setThrowExceptionIfNoHandlerFound(true);
        return dispatcherServlet;
    }

    @Bean
    public ServletRegistrationBean servletRegistrationBean() {
        FacesServlet servlet = new FacesServlet();
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(servlet, "*.xhtml");
        servletRegistrationBean.setLoadOnStartup(1);
        return servletRegistrationBean;
    }

    @Bean
    public ServletListenerRegistrationBean<ConfigureListener> jsfConfigureListener() {
        return new ServletListenerRegistrationBean<ConfigureListener>(new ConfigureListener());
    }

    @Override
    public void setServletContext(ServletContext servletContext) {
        servletContext.setInitParameter("com.sun.faces.forceLoadConfiguration", Boolean.TRUE.toString());
    }
}

HelloBean 类：

@ManagedBean(value = "helloBean")
@ViewScoped
public class HelloBean implements Serializable {

    private String hello = "Hello from PrimeFaces and Spring Boot!";

    public String getHello() {
        return hello;
    }

    @PostConstruct
    public void init() {
        System.out.println("---------");
        System.out.println(hello);
    }
}

index.xhtml 文件：

<f:view xmlns="http://www.w3c.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:ng="http://xmlns.jcp.org/jsf/passthrough"
    xmlns:prime="http://primefaces.org/ui">
    <h:head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
        <title>#{menuController.title}</title>
        <style>
        body {font-size:12px; }
</style>
    </h:head>
    <h:body>
        <h:form>
            <prime:panel header="What do you see here?" >
                <div style="height:50px">
                    This is a simple PrimeFaces 5 project running on Spring Boot 1.1.4.
                </div>
            </prime:panel>
            <prime:panel header="JSF 2.2 Bean Access">
                #{helloBean.hello}
            </prime:panel>
        </h:form>
    </h:body>
</f:view>

谁能告诉我为什么 helloBean 没有显示在 index.xhtml 上？

Answer 1

我终于找到了解决问题的方法。问题出在 HelloBean.class 中。我使用了不正确的导入 - 导入 javax.annotation.ManagedBean 而不是 import javax.faces.bean.ManagedBean;

Answer 2

我做了一个不同的配置来运行 Spring Boot + JSF。我认为它更简单。看看吧：

faces-config.xml

<application>       
    <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver> 
</application>

<lifecycle>
    <phase-listener>org.springframework.web.jsf.DelegatingPhaseListenerMulticaster</phase-listener>
</lifecyle>

MyApp.java

@SpringBootApplication
public class MyApp extends SpringBootServletInitializer {           
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(MyApp.class);
    }

    @Bean
    public ServletRegistrationBean servletRegistrationBean() {
        FacesServlet servlet = new FacesServlet();
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(servlet, "*.jsf");
        return servletRegistrationBean;
    }
}

从 Spring Boot 1.2 及更高版本开始，您可以在 application.properties 文件中设置 JSF 参数，如下所示：

### JSF CONFIGS ###
server.context_parameters.com.sun.faces.forceLoadConfiguration=true

当然是托管 Bean。切记不要将 javax.faces.bean 包用于 bean 注释

MyBean.java

import javax.annotation.ManagedBean;
import javax.faces.view.ViewScoped;    

@ManagedBean
@ViewScoped
public class MyBean {
    public String getHello() {
        return "hello";
    }
}

最后是视图：

<ui:composition
    xmlns:h="http://xmlns.jcp.org/jsf/html"
    xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
    xmlns:f="http://xmlns.jcp.org/jsf/core"
    xmlns:c="http://xmlns.jcp.org/jsp/jstl/core"
    xmlns:p="http://primefaces.org/ui"
    template="views/templates/basic_template.xhtml"
>

<ui:define name="body_content">
    <p:panel header="JSF 2.2 Bean Access">
        <h:outputText value="#{myBean.hello}" />
    </p:panel>
</ui:define>
</ui:composition>