Spring中配置Web Flow
Spring Web Flow 是 Spring 的一个子项目，其最主要的目的是解决跨越多个请求的、用户与服务器之间的、有状态交互问题，比较适合任何比较复杂的、有状态的、需要在多个页面之间跳转的业务过程。
最常见的流程就是购物的流程了:
加入购物车-->查看购物车-->提交订单-->付款-->返回首页:
image
项目结构如图所示:(由于是jsp之间互相的跳转,我们这边没有加入java文件夹)
image
相关代码如下所示:
mvc-dispatcher.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置包扫描器 -->
<context:component-scan base-package="com.wrh.controller"/>
<!-- 配置注解驱动 -->
<mvc:annotation-driven/>
<import resource="webmvc-config.xml"/>
<import resource="webflow-config.xml"/>
</beans>
webflow-config.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:webflow="http://www.springframework.org/schema/webflow-config"
xsi:schemaLocation=" http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/webflow-config
http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.0.xsd">
<!-- 装配流程执行期：为用户创建和启动一个流程执行实例，不负责加载流程定义-->
<webflow:flow-executor id="flowExecutor" />
<!-- 配置流程注册表，其功能为：负责加载流程定义-->
<!-- 所有 flow的定义文件它的位置在这里进行配置， flow-builder-services 用于配置 flow 的特性 -->
<webflow:flow-registry id="flowRegistry" flow-builder-services="flowBuilderServices">
<webflow:flow-location path="/WEB-INF/flows/shopping.xml" id="shopping" />
<!-- 在这个声明中，流程注册表会在该path下查找流程定义-->
</webflow:flow-registry>
<!--Web Flow 中的视图通过 MVC 框架的视图技术来呈现 -->
<webflow:flow-builder-services id="flowBuilderServices" view-factory-creator="mvcViewFactoryCreator" />
<!-- 指明 MVC 框架的 view resolver ，用于通过 view 名查找资源 -->
<bean id="mvcViewFactoryCreator" class="org.springframework.webflow.mvc.builder.MvcViewFactoryCreator">
<property name="viewResolvers" ref="viewResolver" />
</bean>
</beans>
webmvc-config.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--此配置与下面没有注释掉的代码功能一样
<bean id="flowHandlerMapping" class="org.springframework.webflow.mvc.servlet.FlowHandlerMapping">
<property name="flowRegistry" ref="flowRegistry"/>
<property name="defaultHandler">
<bean class="org.springframework.web.servlet.mvc.UrlFilenameViewController" />
</property>
</bean>
<bean id="flowHandlerAdapter" class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter">
<property name="flowExecutor" ref="flowExecutor"/>
</bean>
-->
<bean id="viewMappings"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<!-- /shopping.do 请求由 flowController 来处理 -->
<property name="mappings">
<props>
<prop key="/shopping.do">flowController</prop>
</props>
<!--<value> /shopping.do=flowController </value>-->
</property>
<property name="defaultHandler">
<!-- UrlFilenameViewController 会将 "/index" 这样的请求映射成名为 "index" 的视图 -->
<bean class="org.springframework.web.servlet.mvc.UrlFilenameViewController" />
</property>
</bean>
<bean id="flowController" class="org.springframework.webflow.mvc.servlet.FlowController">
<property name="flowExecutor" ref="flowExecutor" />
</bean>
</beans>
shopping.xml:
<?xml version="1.0" encoding="UTF-8"?>
<flow xmlns="http://www.springframework.org/schema/webflow"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/webflow
http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">
<!-- view-state中的view对应jsp文件夹中的jsp页面，on是触发事件，to对应state id -->
<!-- 根据排在第一位的顺序来执行 -->
<view-state id="viewCart" view="viewCart">
<transition on="submit" to="viewOrder">
</transition>
</view-state>
<view-state id="viewOrder" view="viewOrder">
<transition on="confirm" to="orderConfirmed">
</transition>
</view-state>
<view-state id="orderConfirmed" view="orderConfirmed">
<transition on="returnToIndex" to="returnToIndex">
</transition>
</view-state>
<end-state id="returnToIndex" view="externalRedirect:/index.jsp">
</end-state>
</flow>
orderConfirmed.jsp:
<?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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Cart Application</title>
</head>
<body>
<h1>Order Confirmed</h1>
<a href="${flowExecutionUrl}&_eventId=returnToIndex">Return to
index</a>
</body>
</html>
viewCart.jsp:
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Cart Application</title>
</head>
<body>
<h1>View Cart</h1>
<a href="${flowExecutionUrl}&_eventId=submit">Submit</a>
</body>
</html>
viewOrder.jsp:
<?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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Cart Application</title>
</head>
<body>
<h1>Order</h1>
<a href="${flowExecutionUrl}&_eventId=confirm">Confirm</a>
</body>
</html>
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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 http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<display-name>winner-test Web Application</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--指定了核心配置文件的位置 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:mvc-dispatcher.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
index.jsp:
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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 http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<display-name>winner-test Web Application</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--指定了核心配置文件的位置 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:mvc-dispatcher.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
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.wrh</groupId>
<artifactId>springwebflow</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>springwebflow 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>org.springframework.webflow</groupId>
<artifactId>spring-webflow</artifactId>
<version>2.4.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<finalName>springwebflow</finalName>
</build>
</project>
