JSF Spring 集成
Spring 提供了特殊的类 DelegatingVariableResolver 以无缝的方式将 JSF 和 Spring 集成在一起。
在 JSF 中集成 Spring 依赖注入 (IOC) 功能需要以下步骤。
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 spring 类
DelegatingVariableResolver。
<faces-config>
<application>
<variable-resolver>
org.springframework.web.jsf.DelegatingVariableResolver
</variable-resolver>
...
</faces-config>
第 2 步:添加上下文侦听器
在 web.xml 中添加 spring 框架提供的
ContextLoaderListener 和
RequestContextListener 监听器。
<web-app>
...
<!--Add Support for Spring-->
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<listener>
<listener-class>
org.springframework.web.context.request.RequestContextListener
</listener-class>
</listener>
...
</web-app>
第 3 步:定义依赖
在 applicationContext.xml 中定义 bean,它将用作托管 bean 中的依赖项。
<beans>
<bean id = "messageService"
class = "com.tutorialspoint.test.MessageServiceImpl">
<property name = "message" value = "Hello World!" />
</bean>
</beans>
步骤 4:添加依赖
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。这允许人们轻松地将基于 spring 的依赖项注入到自己的 JSF 管理的 bean 中。
我们在这里注入了 messageService 作为基于 spring 的依赖项。
<faces-config>
...
<managed-bean>
<managed-bean-name>userData</managed-bean-name>
<managed-bean-class>com.tutorialspoint.test.UserData</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<managed-property>
<property-name>messageService</property-name>
<value>#{messageService}</value>
</managed-property>
</managed-bean>
</faces-config>
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();
}
}
示例应用
让我们创建一个测试 JSF 应用程序来测试 Spring 集成。
步骤 |
描述 |
1 |
在com.tutorialspoint.test 包下创建一个名为helloworld 的项目,如JSF-第一个应用程序 章节所述。 |
2 |
修改 pom.xml 如下所述。 |
3 |
在 WEB-INF 文件夹中创建 faces-config.xml,如下所述。 |
4 |
修改 web.xml,如下所述。 |
5 |
在 WEB-INF 文件夹中创建 applicationContext.xml,如下所述。 |
6 |
在包 com.tutorialspoint.test 下创建 MessageService.java,如下所述。 |
7 |
在包 com.tutorialspoint.test 下创建 MessageServiceImpl.java,如下所述。 |
8 |
在包 com.tutorialspoint.test 下创建 UserData.java,如下所述。 |
9 |
修改 home.xhtml 如下所述。保持其余文件不变。 |
10 |
编译并运行应用程序以确保业务逻辑按照要求工作。 |
11 |
最后,以war文件的形式构建应用,并部署到Apache Tomcat Webserver中。 |
12 |
使用适当的 URL 启动您的 Web 应用程序,如下面最后一步所述。 |
pom.xml
<project xmlns = "http://maven.apache.org/POM/4.0.0"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.tutorialspoint.test</groupId>
<artifactId>helloworld</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>helloworld Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>2.1.7</version>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>2.1.7</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
</dependencies>
<build>
<finalName>helloworld</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>validate</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${basedir}/target/helloworld/resources
</outputDirectory>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
faces-config.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<faces-config
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-facesconfig_2_0.xsd"
version = "2.0">
<application>
<variable-resolver>
org.springframework.web.jsf.DelegatingVariableResolver
</variable-resolver>
</application>
<managed-bean>
<managed-bean-name>userData</managed-bean-name>
<managed-bean-class>com.tutorialspoint.test.UserData</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<managed-property>
<property-name>messageService</property-name>
<value>#{messageService}</value>
</managed-property>
</managed-bean>
</faces-config>
web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<!--Add Support for Spring-->
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<listener>
<listener-class>
org.springframework.web.context.request.RequestContextListener
</listener-class>
</listener>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
</web-app>
applicationContext.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE beans public "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean id = "messageService"
class = "com.tutorialspoint.test.MessageServiceImpl">
<property name = "message" value = "Hello World!" />
</bean>
</beans>
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;
}
}
用户数据.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
<?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 Tutorial!</title>
</h:head>
<h:body>
<h2>Spring Integration Example</h2>
#{userData.greetingMessage}
</h:body>
</html>
一旦您准备好完成所有更改,让我们像在 JSF-First Application 章节中一样编译和运行应用程序。如果您的应用程序一切正常,这将产生以下结果。
