Question

我是网络流量的新手，所以我不确定如何执行此操作：我有一个弹簧mvc控制器，我有一个弹簧webflow。其中一个流状态应该显示用于添加新客户端的表单。在控制器中，我有方法将Client对象（绑定到表单作为modelAttribute =＆＃34; client＆＃34;）保存到数据库。我不知道如何将控件从Webflow传递到控制器并返回或直接在流中创建模型属性以与表单绑定（但据我后面理解，我仍然需要重定向到控制器）。

请帮助我，在这种情况下最好的逻辑（解决方案）是什么？

我试过了：

<view-state id="clientOptions" view="options" model="client">
    <transition on="submit" to="confirm"/>
    <transition on="back" to="viewCart"/>
</view-state>

我的表单在选项视图中，绑定就像这样

<form:form modelAttribute="client" method="post">

Answer 1

假设您的web.xml中有一个映射：

<servlet>
    <servlet-name>yourApp</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>yourApp</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>

在servlet xml文件中定义以下内容（上面是web.xml定义yourApp-Servlet.xml）：

    <!--Handler mapping for your controller which does some work per your requirements-->
    <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="order" value="1" />
        <property name="mappings">
            <props>
                <prop key="/handledByController.htm">yourController</prop>
            </props>
        </property>
    </bean>
    <!--Your controller bean definition-->
    <bean id="yourController" class="package.YourController">
        //some properties like service reference
    </bean>
    <!--Class which handles the flow related actions-->
    <bean id="classForThisFlow" class="package.ClassForThisFlow">
    </bean>

我假设你在webflowconfig xml中有如下定义的Web流程所需配置（对于webflow 2.3 - 1配置稍有不同）：

    <!--View  resolvers-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <bean id="flowViewResolver" class="org.springframework.webflow.mvc.builder.MvcViewFactoryCreator">  
        <property name="viewResolvers" ref="internalResourceViewResolver"/>  
    </bean>  
    <!--flow xml registration - flow xmls are in flows folder-->
    <flow:registry id="flowRegistry">
        <flow:location path="/WEB-INF/flows/**/*-flow.xml" />
    </flow:registry>

    <!--Flow controller to which dispacther servlet delegates the control to manage flow execution-->
    <bean name="flowController" class="org.springframework.webflow.executor.mvc.FlowController">
        <property name="flowExecutor" ref="flowExecutor" />
    </bean>

    <flow:executor id="flowExecutor" registry-ref="flowRegistry">
        <flow:repository type="continuation" max-conversations="1" max-continuations="30" />
        <flow:execution-listeners>
            <flow:listener ref="listener"/>
        </flow:execution-listeners>     
    </flow:executor>
    <!--validator to be identified and registered for view state validations if enabled-->
    <bean name="validator" class="org.springframework.validation.localvalidation.LocalValidatorFactoryBean"/>  
    <flow:flow-builder-services id="flowBuilderServices" view-factory-creator="flowViewResolver" validator="validator"/>

在你的flow xml中你有以下视图：

            <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-2.3.xsd"
start-state="prepareFlow">
<action-state id="prepareFlow">
    <evaluate expression="classForThisFlow.prepareFlowForm()" result="flowScope.client"/>
    <transition to="clientOptions" />
</action-state>
    <view-state id="clientOptions" view="options" model="client">
        <!--If you have defined validator for the action class handling this view, then validation will kick in. You can disable validation by validate="false"-->
                        <!--By default binding of form fields will happen to the model specified; you can disable it by bind="false"--> 
        <transition on="submit" to="confirm"/>
        <transition on="back" to="viewCart"/>
    </view-state>

    <action-state id="confirm">
        <!--Do some action on the form-->
        <evaluate expression="classForThisFlow.methodName(flowRequestContext,flowScope.client)"/>
        <transition to="returnToController" />
    </action-state>

    <!--This will take the control back to yourController; See mappingis specified as *.htm in web.xml-->
    <end-state id="returnToController" view="externalRedirect:handledByController.htm" />

您可以通过会话将客户端传递给控制器：

    public class ClassForThisFlow{
      public Client prepareFlowForm(){
        Client client= new Client();
    ...
    return client;
       }
       public void methodName(RequestContext context, Client client){
    HttpSession session = ((HttpServletRequest)context.getExternalContext().getNativeRequest()).getSession();
              session.setAttribute("client",client);
       }
       .....
       }

通过这种方式，您可以浏览您的流程并在提交“确认”时，如果需要，您将被带到行动类，否则将提交的最终状态ID和转换更改为“确认”，这将指示控制你的控制器。在您的控制器中，您可以访问会话并撤消客户端对象以进行进一步处理。

Answer 2

我用来在application-context.xml中声明我的控制器或处理程序例如：

<!-- handler/controller-->
<bean name="contextHandler" class="aaaa.bbbb.ContextHandler" scope="session">
    <property name="service" ref="usuarisBO" />
    <property name="usuari" ref="usuariLDAP" />
</bean>

然后在我的流程中我可以调用id对象和一些方法：

如果你需要一个交易，你可以在一个动作方法中做到这一点，例如：

<action-state id="a_pas2">
    <evaluate expression="contextHandler.carreguemValorsPas2(flowRequestContext,usuari)" />
        <transition on="*" to="v_pas2" />
</action-state>



<view-state id="v_pas2" view="/WEB-INF/xhtml/crearCalendariFiscal/formulariCrear2.xhtml">
        <transition on="pas3" to="a_pas3"/>
</view-state>

我希望它有所帮助。

Web流添加用于与表单值绑定的模型属性

2 个答案: