Spring Boot JSF集成

楚皓君

2023-03-14

问题内容：

Environment :

Tomcat 8

Spring Boot 1.5

JSF 2.2

Apache MyFaces

Spring MVC

Code :

我正在Servlet 3.0环境中集成Spring Boot和JSF 2.2。

配置类：

JSFConfig.java - Config for JSF.

@Configuration
@ComponentScan({"com.atul.jsf"})
public class JSFConfig {

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

}

Spring Boot Main Class :

@SpringBootApplication
@Import({ // @formatter:off 
    JPAConfig.class,
    ServiceConfig.class, // this contains UserServiceImpl.java class.
    WebConfig.class,
    JSFConfig.class,
})
public class SpringbootJpaApplication extends SpringBootServletInitializer{

    public static void main(String[] args) {
        SpringApplication.run(SpringbootJpaApplication.class, args);
    }

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

Managed Bean :

UserBean.java - Managed Bean for JSF

@ManagedBean
@SessionScoped
public class UserBean implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private String name;
    @ManagedProperty(value="#{userServiceImpl}")
    private UserServiceImpl userServiceImpl;

    public void addUser(){      
        System.out.println("User Gets added "+this.name);       
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    public UserServiceImpl getUserServiceImpl() {
        return userServiceImpl;
    }

    public void setUserServiceImpl(UserServiceImpl userServiceImpl) {
        this.userServiceImpl = userServiceImpl;
    }
}

Facelets :

home.xhtml - home page

<?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:f="http://java.sun.com/jsf/core"
      xmlns:h="http://java.sun.com/jsf/html">

    <h:head>
        <title>JSF 2.0 Hello World</title>
    </h:head>
    <h:body>
        <h2>JSF 2.0 Hello World Example - hello.xhtml</h2>
        <h:form>
           <h:inputText value="#{userBean.name}"></h:inputText>
           <h:commandButton value="Submit" action="#{userBean.addUser}"></h:commandButton>
        </h:form>
    </h:body>
</html>

faces-config.xml：

<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://xmlns.jcp.org/xml/ns/javaee"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
              version="2.2">

    <application>
        <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
    </application>
    <lifecycle>
        <phase-listener>org.springframework.web.jsf.DelegatingPhaseListenerMulticaster</phase-listener>
    </lifecycle>

</faces-config>

问题：

1）当我提交表格时home.xhtml , userBean.addUser被调用。2）userBean.name设置用户输入的值。3）但是userServiceImpl为NULL。4）这是否意味着Spring和JSF没有集成？我也已经SpringBeanFacesELResolver按照

faces-config.xml

我还尝试了从UserBean.java中删除所有JSF特定注释，仅使用了Spring特定注释，如下所示-

 @Component
    @SessionScoped 
    public class UserBean implements Serializable{

        /**
         * 
         */
        private static final long serialVersionUID = 1L;
        private String name;
        @Autowired
        private UserServiceImpl userServiceImpl;


    }

但是，当我提交表格时，我遇到了“目标无法到达”错误#{userBean)。这意味着userBean对于Spring是不可发现的

5）我在这里想念什么吗？6）我没有使用Spring Boot提供的嵌入式tomcat

问题答案：

Dependencies

除了标准的Web Starter依赖项之外，你还需要包括标记为提供的tomcat嵌入式jasper（感谢@Fencer在此处发表评论）。否则，由于JSF取决于JSP处理器，你将在应用程序启动时遇到异常（另请参见答案末尾的第一个链接）。

<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-jasper</artifactId>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Servlet registration

注册JSF Servlet并将其配置为在启动时加载（不需要web.xml）。如果使用JSF 2.2，则最好是*.xhtml至少在使用facelet时使用映射：

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

使你的配置类实现，ServletContextAware以便你可以设置init参数。在这里，你必须强制JSF加载配置：

@Override
public void setServletContext(ServletContext servletContext) {
    servletContext.setInitParameter("com.sun.faces.forceLoadConfiguration",
            Boolean.TRUE.toString());
    servletContext.setInitParameter("javax.faces.FACELETS_SKIP_COMMENTS", "true");
    //More parameters...
}

EL integration

在faces-config.xml中声明EL解析器。这将成为视图文件与托管Bean属性和方法之间的粘合剂：

<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
    version="2.2">

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

</faces-config>

The View Scope

编写一个自定义的Spring范围来模拟JSF视图范围（请注意，你的bean将由Spring而不是JSF管理）。它看起来应该像这样：

public class ViewScope implements Scope {

    @Override
    public Object get(String name, ObjectFactory<?> objectFactory) {
        Map<String, Object> viewMap = FacesContext.getCurrentInstance()
            .getViewRoot().getViewMap();
        if (viewMap.containsKey(name)) {
            return viewMap.get(name);
        } else {
            Object object = objectFactory.getObject();
            viewMap.put(name, object);
            return object;
        }
    }

    @Override
    public String getConversationId() {
        return null;
    }

    @Override
    public void registerDestructionCallback(String name, Runnable callback) {

    }

    @Override
    public Object remove(String name) {
        return FacesContext.getCurrentInstance().getViewRoot().getViewMap().remove(name);
    }

    @Override
    public Object resolveContextualObject(String arg0) {
        return null;
    }

}

并将其注册到你的配置类中：

@Bean
public static CustomScopeConfigurer viewScope() {
    CustomScopeConfigurer configurer = new CustomScopeConfigurer();
    configurer.setScopes(
            new ImmutableMap.Builder<String, Object>().put("view", new ViewScope()).build());
    return configurer;
}

Ready to go!

现在，你可以按照以下方式声明托管bean。记住要使用@Autowired（最好在构造函数中）代替@ManagedProperty，因为你正在处理Spring Beans。

@Component
@Scope("view")
public class MyBean {

    //Ready to go!

}

Still pending to achieve

我无法在Spring Boot上下文中使用JSF特定的注释。所以@FacesValidator，@FacesConverter，@FacesComponent，等不能使用。仍然有机会在faces-config.xml中声明它们（参见xsd），这是一种老式的方法。

Spring Boot JSF集成

相关阅读

相关文章

相关问答

相关工具

相关文档