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📜  JSF-Spring集成

📅  最后修改于: 2020-10-23 06:48:41             🧑  作者: Mango

Spring提供了特殊的DelegatingVariableResolver类，以无缝方式将JSF和Spring集成在一起。

在JSF中集成Spring Dependency Injection（IOC）功能需要执行以下步骤。

步骤1：添加DelegatingVariableResolver

在faces-config.xml中添加一个变量解析器条目，以指向弹簧类DelegatingVariableResolver 。


   
   
      org.springframework.web.jsf.DelegatingVariableResolver
   
   ...

步骤2：添加上下文侦听器

在web.xml中添加spring框架提供的ContextLoaderListener和RequestContextListener侦听器。


   ...
   
   
      
         org.springframework.web.context.ContextLoaderListener
      
   
   
   
      
         org.springframework.web.context.request.RequestContextListener
      
   
   ...

步骤3：定义依赖关系

在applicationContext.xml中定义将用作托管bean中的依赖项的bean。

步骤4：添加依赖关系

DelegatingVariableResolver首先将值查找委托给JSF的默认解析器，然后委托给Spring的WebApplicationContext。这使人们可以轻松地将基于spring的依赖项注入到自己的JSF管理的bean中。

我们在这里将messageService作为基于spring的依赖项注入。


   ...
   
      userData
      com.tutorialspoint.test.UserData
      request
      
      
         messageService
         #{messageService}

步骤5：使用依赖

//jsf managed bean
public class UserData {
   
   //spring managed dependency
   private MessageService messageService;

   public void setMessageService(MessageService messageService) {
      this.messageService = messageService;
   }

   public String getGreetingMessage() {
      return messageService.getGreetingMessage();
   }
}

应用范例

让我们创建一个测试JSF应用程序以测试spring集成。

Step Description
1 Create a project with a name helloworld under a package com.tutorialspoint.test as explained in the JSF – First Application chapter.
2 Modify pom.xml as explained below.
3 Create faces-config.xml in WEB-INF folder as explained below.
4 Modify web.xml as explained below.
5 Create applicationContext.xml in WEB-INF folder as explained below.
6 Create MessageService.java under package com.tutorialspoint.test as explained below.
7 Create MessageServiceImpl.java under package com.tutorialspoint.test as explained below.
8 Create UserData.java under package com.tutorialspoint.test as explained below.
9 Modify home.xhtml as explained below. Keep the rest of the files unchanged.
10 Compile and run the application to make sure the business logic is working as per the requirements.
11 Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver.
12 Launch your web application using appropriate URL as explained below in the last step.

pom.xml


   
   4.0.0
   com.tutorialspoint.test
   helloworld
   war
   1.0-SNAPSHOT
   helloworld Maven Webapp
   http://maven.apache.org
   
   
      
         junit
         junit
         3.8.1
         test
      
      
      
         com.sun.faces
         jsf-api
         2.1.7
      
      
      
         com.sun.faces
         jsf-impl
         2.1.7
      
      
      
         javax.servlet
         jstl
         1.2
      
      
      
         org.springframework
         spring-core
         3.1.2.RELEASE
      
      
      
         org.springframework
         spring-web
         3.1.2.RELEASE 
      
   
   
   
      helloworld
      
         
            org.apache.maven.plugins
            maven-compiler-plugin
            2.3.1
            
               1.6
               1.6
            
         
         
         
            maven-resources-plugin
            2.6
            
            
               
                  copy-resources
                  validate
                  
                     copy-resources
                  
                  
                  
                     ${basedir}/target/helloworld/resources
                        
                               
                        
                           src/main/resources
                           true

faces-config.xml


 
   
   
      
         org.springframework.web.jsf.DelegatingVariableResolver
      
   
   
   
      userData
      com.tutorialspoint.test.UserData
      request
      
         messageService
         #{messageService}

web.xml


   Archetype Created Web Application

   
      javax.faces.PROJECT_STAGE
      Development
       
   
   
    
      
         org.springframework.web.context.ContextLoaderListener
      
   
   
   
      
         org.springframework.web.context.request.RequestContextListener
      
   
   
   
      Faces Servlet
      javax.faces.webapp.FacesServlet
   
   
   
      Faces Servlet
      *.jsf

applicationContext.xml

MessageService.java

package com.tutorialspoint.test;

public interface MessageService {
   String getGreetingMessage();
}

MessageServiceImpl.java

package com.tutorialspoint.test;

public class MessageServiceImpl implements MessageService {
   private String message;
   
   public String getGreetingMessage() {
      return message;
   }
   
   public String getMessage() {
      return message;
   }
   public void setMessage(String message) {
      this.message = message;
   }
}

UserData.java

package com.tutorialspoint.test;

import java.io.Serializable;

public class UserData implements Serializable {

   private static final long serialVersionUID = 1L;
    private MessageService messageService;

   public MessageService getMessageService() {
      return messageService;
   }

   public void setMessageService(MessageService messageService) {
      this.messageService = messageService;
   }

   public String getGreetingMessage() {
      return messageService.getGreetingMessage();
   }
}

home.xhtml





   
   
      JSF Tutorial!
   
   
   
      
Spring Integration Example

      #{userData.greetingMessage}

准备好所有更改后，让我们像在JSF-First Application一章中那样编译并运行该应用程序。如果您的应用程序一切正常，将产生以下结果。

JSF春季结果