在 grails 3 应用程序中使用 spring webflow

Question

我一直在尝试将我的一些 grails 2 代码移植到 grails 3。此特定代码使用 grails-webflow 插件（仅在 grails 2.x 之前受支持；它现在已损坏，因为一些大修在 grails 核心中）。

所以我决定直接在我的应用程序中使用 spring webflow。我已经能够做基本的管道。那就是我有设置 * webflow 的应用上下文 * 创建流工厂和所有 * 写了流程 xml。 * 创建了其他必要的 bean。

现在，当我点击映射到我的流程的 url 时，我可以看到我的 .gsp 页面正在呈现。但问题是，它没有解决布局。页面即将到来，但没有任何 styling/layout。我缺少什么？

这是我的gsp page。

<html>
<head>
<title><g:brandedTitle/> - Repository Database: Administrator</title>
<meta content="main" name="layout"/>
<script type="text/javascript" src="${assetPath(src: 'da.js')}"></script>
.... 
....

这就是我为 webflow 做管道的方式。

@Configuration
@ComponentScan
class InstallRepositoryWebflow extends AbstractFlowConfiguration {

    @Autowired
    GroovyPagesTemplateEngine groovyPagesTemplateEngine;
    @Autowired
    GroovyPageLocator groovyPageLocator;
    @Autowired
    GrailsLayoutViewResolver grailsLayoutViewResolver;

    @Bean
    public FlowDefinitionRegistry flowRegistry() {
        return getFlowDefinitionRegistryBuilder(flowBuilderServices())
        // type on browser localhost:<port>/<context-path>/hitMeToInvokeThisFlow to invoke this flow.
                .addFlowLocation("/WEB-INF/flows/install-repository.xml", "installrep/install")
                .build();
    }

    @Bean
    public FlowExecutor flowExecutor() {
        return getFlowExecutorBuilder(flowRegistry()).build();
    }

    @Bean
    public FlowBuilderServices flowBuilderServices() {
        return getFlowBuilderServicesBuilder()
                .setViewFactoryCreator(viewFactoryCreator())
                .build();
    }

    @Bean
    public ViewFactoryCreator viewFactoryCreator() {
        List<ViewResolver> resolvers = new ArrayList<>(1);
        resolvers.add(gspViewResolver());
        resolvers.add(grailsLayoutViewResolver);
        ViewFactoryCreator creator = new MvcViewFactoryCreator();
        creator.setViewResolvers(resolvers);
        return creator;
    }

    @Bean
    ViewResolver gspViewResolver() {
        GroovyPageViewResolver innerGspViewResolver = new GroovyPageViewResolver(groovyPagesTemplateEngine, groovyPageLocator);
        //innerGspViewResolver.setAllowGrailsViewCaching(!gspReloadingEnabled || viewCacheTimeout != 0);
        //innerGspViewResolver.setCacheTimeout(gspReloadingEnabled ? viewCacheTimeout : -1);
        return innerGspViewResolver;
    }
}

这是resource.groovy

中的相关部分

 flowHandlerAdapter(FlowHandlerAdapter) {
        flowExecutor = ref("flowExecutor");
    }

    flowHandlerMapping(FlowHandlerMapping) {
        flowRegistry = ref("flowRegistry");
    }

问题是 为什么我的布局没有被渲染？我错过了什么？

Answer 1

终于找到了这个问题的答案。如果我使用 SitemeshLayoutViewResolver layoutViewResolver，而不是创建自定义解析器 GroovyPageViewResolver innerGspViewResolver = new GroovyPageViewResolver(groovyPagesTemplateEngine, groovyPageLocator);，那么我的问题就解决了。所以基本上它必须是这样的。

@Bean
ViewResolver gspViewResolver() {
    return jspViewResolver;
}
@Autowired
GrailsViewResolver jspViewResolver

这是示例项目 here，以防有人正在寻找工作示例。

更新

当我完成所有这些后，我遇到了一个非常奇怪的问题。当我运行来自 intellij 的应用程序时，应用程序的 webflow 部分工作正常。但是当我使用 gradlew assemble 任务创建 war 时，我总是在应用程序上看到 /error 页面。在日志中，它显示 No mapping found for HTTP request with URI * in DispatcherServlet with name 'grailsDispatcherServlet'.

显然，我要创建的 bean 不存在。为了解决这个问题，我放弃了基于注释的配置，并将 resources.xml 文件放在 grails-app/conf/spring/ 目录中。这解决了 war 的问题。这是我的配置文件。

<?xml version="1.0" encoding="UTF-8"?>
<!--suppress SpringFacetInspection -->
<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.xsd
           http://www.springframework.org/schema/webflow-config
           http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.4.xsd">

    <webflow:flow-registry id="flowRegistry" flow-builder-services="flowBuilderServices">
        <webflow:flow-location path="/WEB-INF/flows/install-repository.xml" id="installrep/install"/>
    </webflow:flow-registry>

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

    <webflow:flow-builder-services id="flowBuilderServices" view-factory-creator="mvcViewFactoryCreator"/>

    <bean id="mvcViewFactoryCreator" class="org.springframework.webflow.mvc.builder.MvcViewFactoryCreator">
        <property name="viewResolvers" ref="resolvers"/>
    </bean>

    <bean id="resolvers" class="java.util.ArrayList">
        <constructor-arg>
            <list>
                <ref bean="jspViewResolver" />
            </list>
        </constructor-arg>
    </bean>

    <bean class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter">
        <property name="flowExecutor" ref="flowExecutor" />
    </bean>

    <bean class="org.springframework.webflow.mvc.servlet.FlowHandlerMapping">
        <property name="flowRegistry" ref="flowRegistry"/>
        <property name="order" value="0"/>
    </bean>

</beans>

Answer 2

要使用 resources.groovy 而不是 applicationContext.xml，您可以执行以下操作：

xmlns([webflow:"http://www.springframework.org/schema/webflow-config"])

webflow.flow-registry(
        id:"flowRegistry",
        flow-builder-services:"flowBuilderServices"
){
    webflow.flow-location(
            path:"/WEB-INF/flows/install-repository.xml",
            id:"installrep/install"
    )
}//eo flow-registry

webflow.flow-executor(id:"flowExecutor")

webflow.flow-builder-services(
        id:"flowBuilderServices",
        view-factory-creator:"mvcViewFactoryCreator")

mvcViewFactoryCreator(org.springframework.webflow.mvc.builder.MvcViewFactoryCreator){
    viewResolvers =  ref("resolvers")
}

resolvers(ArrayList, [ ref("jspViewResolver") ])

myFlowHandlerAdapter(org.springframework.webflow.mvc.servlet.FlowHandlerAdapter){
    flowExecutor = ref("flowExecutor")
}

myFlowHandlerMapping(org.springframework.webflow.mvc.servlet.FlowHandlerMapping){
    flowRegistry = ref("flowRegistry")
    order = 0
}

在 grails 3 应用程序中使用 spring webflow

Using spring webflow in grails 3 application

grails

spring-webflow

grails3

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