SPRING IN ACTION 第4版笔记-第八章Advanced Spring MVC-001- 配置SpringFlow(flow-executor、flow-registry、FlowHandlerMapping、FlowHandlerAdapter)

一、

1.Wiring a flow executor

<flow:flow-executor id="flowExecutor" />

Although the flow executor is responsible for creating and executing flows, it’s not responsible for loading flow definitions. That responsibility falls to a flow registry,which you’ll create next.

2.Configuring a flow registry

A flow registry’s job is to load flow definitions and make them available to the flow executor.

(1)通配符<flow:flow-location-pattern>

 <flow:flow-registry id="flowRegistry" base-path="/WEB-INF/flows">
     <flow:flow-location-pattern value="*-flow.xml" />
 </flow:flow-registry>

As declared here, the flow registry will look for flow definitions under the / WEB-INF /flows directory, as specified in the base-path attribute. Per the <flow:flow-location-pattern> element, any XML file whose name ends with -flow.xml will
be considered a flow definition.

All flows are referred to by their ID s.Using <flow:flow-location-pattern> as you have, the flow ID is the directory
path relative to the base-path —or the part of the path represented with the double asterisk

或者

   <!-- The registry of executable flow definitions -->
   <flow:flow-registry id="flowRegistry" base-path="/WEB-INF/flows">
      <flow:flow-location-pattern value="/**/*-flow.xml" />
   </flow:flow-registry>

(2)明确位置 <flow:flow-location>

 <flow:flow-registry id="flowRegistry">
     <flow:flow-location path="/WEB-INF/flows/springpizza.xml" />
 </flow:flow-registry>

When configured this way, the flow’s ID is derived from the base name of the flow definition file, springpizza in this case.

或者指定id

 <flow:flow-registry id="flowRegistry">
     <flow:flow-location id="pizza" path="/WEB-INF/flows/springpizza.xml" />
 </flow:flow-registry>

3.Handling flow requests

(1)装配FlowHandlerMapping,告诉DispatcherServlet，把flow交给它处理

DispatcherServlet typically dispatches requests to controllers. But for flows, you need a FlowHandlerMapping to help DispatcherServlet know that it should send flow requests to Spring Web Flow

 <!--Maps request paths to flows in the flowRegistry-->
   <bean class="org.springframework.webflow.mvc.servlet.FlowHandlerMapping">
     <property name="flowRegistry" ref="flowRegistry" />
   </bean>

As you can see, the FlowHandlerMapping is wired with a reference to the flow registry so it knows when a request’s URL maps to a flow. For example, if you have a flow whose ID is pizza , then FlowHandlerMapping will know to map a request to that flow if the request’s URL pattern (relative to the application context path) is /pizza.

(2)装配FlowHandlerAdapter

Whereas the FlowHandlerMapping ’s job is to direct flow requests to Spring Web Flow, it’s the job of a  FlowHandlerAdapter to answer that call. A FlowHandlerAdapter is equivalent to a Spring MVC controller in that it handles requests coming in for a flow and processes those requests.

 <!--
    Dispatches requests mapped to flows to FlowHandler implementations
   -->
   <bean class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter">
     <property name="flowExecutor" ref="flowExecutor" />
   </bean>

This handler adapter is the bridge between DispatcherServlet and Spring Web Flow.It handles flow requests and manipulates the flow based on those requests. Here, it’s wired with a reference to the flow executor to execute the flows for which it handles requests.

二、所有的配置文件如下,webflow模块不支持java配置，只能用xml配置

1.

2.web.xml

 <?xml version="1.0" encoding="ISO-8859-1"?>

 <web-app version="2.5" 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-app_2_5.xsd">

  <context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>/WEB-INF/spring/root-config.xml</param-value>
  </context-param>

  <listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <servlet>
   <servlet-name>SpringPizza</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value></param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
   <servlet-name>SpringPizza</servlet-name>
   <url-pattern>/</url-pattern>
  </servlet-mapping>

 </web-app>

3.root-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:context="http://www.springframework.org/schema/context"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

     <import resource="mvc.xml" />
     <import resource="flow.xml" />
     <import resource="services.xml" />
     <import resource="domain.xml" />
     <import resource="dataaccess.xml" />

     <context:component-scan base-package="com.springinaction.pizza" />

 </beans>

4.mvc.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:mvc="http://www.springframework.org/schema/mvc"
     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

   <mvc:annotation-driven />

   <!-- View resolver for the pizza flow, as shown on page 594 -->
   <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <property name="prefix" value="/WEB-INF/jsp/" />
     <property name="suffix" value=".jsp" />
   </bean>

 </beans>

5.flow.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:flow="http://www.springframework.org/schema/webflow-config"
  xmlns:p="http://www.springframework.org/schema/p"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/webflow-config
    http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.3.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <context:component-scan base-package="com.springinaction.pizza.flow" />

   <!-- Executes flows: the entry point into the Spring Web Flow system -->
   <flow:flow-executor id="flowExecutor" />

   <!-- The registry of executable flow definitions -->
   <flow:flow-registry id="flowRegistry"
            base-path="/WEB-INF/flows">
      <flow:flow-location-pattern value="/**/*-flow.xml" />
   </flow:flow-registry>

   <!--Maps request paths to flows in the flowRegistry-->
   <bean class="org.springframework.webflow.mvc.servlet.FlowHandlerMapping">
     <property name="flowRegistry" ref="flowRegistry" />
   </bean>

   <!--
    Dispatches requests mapped to flows to FlowHandler implementations
   -->
   <bean class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter">
     <property name="flowExecutor" ref="flowExecutor" />
   </bean>

 </beans>

6.services.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-2.0.xsd">

   <bean id="pricingEngine"
       class="com.springinaction.pizza.service.PricingEngineImpl" />        

 <!--
   <lang:groovy id="pricingEngineGroovy"
       script-source="classpath:scripts/PricingEngineImpl.groovy" />
  -->

    <bean id="customerService"
       class="com.springinaction.pizza.service.CustomerServiceImpl" />

   <!-- Payment processing bean, as discussed on page 606 -->
   <bean id="paymentProcessor"
       class="com.springinaction.pizza.service.PaymentProcessor" />

   <bean id="orderService"
       class="com.springinaction.pizza.service.OrderServiceImpl" />

 </beans>

7.domain.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:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

  <context:spring-configured />

  <bean id="order" class="com.springinaction.pizza.domain.Order" abstract="true">
    <property name="pricingEngine" ref="pricingEngine" />
  </bean>

</beans>

8.dataaccess.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-2.0.xsd">
 </beans>