Spring - 如何在Web Flow表单中启用验证？

Question

我在Spring Web Flow中启用基本验证时遇到了一些问题。

这就是我的webflow配置类的样子：

public class FlowConfiguration extends AbstractFlowConfiguration {

    @Autowired
    Validator validator;

    @Bean
    public FlowDefinitionRegistry flowRegistry() {
        return getFlowDefinitionRegistryBuilder()
            .setBasePath("/WEB-INF/flows")
            .setFlowBuilderServices(flowBuilderServices())
            .addFlowLocationPattern("/**/*-flow.xml")
            .build();
    }
    @Bean
    public FlowExecutor flowExecutor() {
        return getFlowExecutorBuilder(flowRegistry()).build();
    }

    @Bean
    public FlowHandlerMapping flowHandlerMapping()
    {
        FlowHandlerMapping fh = new FlowHandlerMapping();
        fh.setFlowRegistry(flowRegistry());
        return fh;
    }
    @Bean
    public FlowHandlerAdapter flowHandlerAdapter()
    {
        FlowHandlerAdapter fh = new FlowHandlerAdapter();
        fh.setFlowExecutor(flowExecutor());
        return fh;
    }

    @Bean
    public FlowBuilderServices flowBuilderServices()
    {
        return getFlowBuilderServicesBuilder()
                .setValidator(validator)
                .build();
    }


}

我知道我必须在FlowBuilderServices中设置验证器，但是当我这样做时，我会收到错误（运行webflow时）：

SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/ElectronicsStore] threw exception [Request processing failed; nested exception is org.springframework.webflow.execution.ActionExecutionException: Exception thrown executing [AnnotatedAction@6397b3b6 targetAction = [EvaluateAction@7880da33 expression = cartServiceImpl.validate(requestParameters.cartId), resultExpression = order.cart], attributes = map[[empty]]] in state 'addCartToOrder' of flow 'checkout' -- action execution attributes were 'map[[empty]]'] with root cause
org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): Property or field 'cartServiceImpl' cannot be found on object of type 'org.springframework.webflow.engine.impl.RequestControlContextImpl' - maybe not public?
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:224)

这是该视图的代码：

<action-state id="addCartToOrder">
        <evaluate expression="cartServiceImpl.validate(requestParameters.cartId)"
            result="order.cart" />

一切正常，但只有从流注册表中删除addFlowBuilderServices方法。你能给我任何指示如何正确配置吗？

我认为FlowBuilderServices会覆盖某些流设置，因此无法正确解析表达式。

WebConfig.java

package godziszewski.patryk.ElectronicsStore.config;

import java.util.ArrayList;
import java.util.List;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.oxm.jaxb.Jaxb2Marshaller;
import org.springframework.validation.Validator;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
import org.springframework.web.multipart.support.StandardServletMultipartResolver;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.ContentNegotiatingViewResolver;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;
import org.springframework.web.servlet.view.tiles3.TilesConfigurer;
import org.springframework.web.servlet.view.tiles3.TilesViewResolver;
import org.springframework.web.servlet.view.xml.MarshallingView;
import org.springframework.web.util.UrlPathHelper;
import godziszewski.patryk.ElectronicsStore.domain.Product;

@Configuration
@Import(godziszewski.patryk.ElectronicsStore.config.FlowConfiguration.class)
@EnableWebMvc
@ComponentScan(basePackages = "godziszewski.patryk")
public class WebConfig extends WebMvcConfigurerAdapter {
    @Bean
    public ViewResolver viewResolver() {
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setSuffix(".jsp");
    resolver.setExposeContextBeansAsAttributes(true); 
    return resolver;
    }

     @Override
        public void configurePathMatch(PathMatchConfigurer configurer) {

            UrlPathHelper urlPathHelper = new UrlPathHelper();
            urlPathHelper.setRemoveSemicolonContent(false);

            configurer.setUrlPathHelper(urlPathHelper);
        }


    @Override
    public Validator getValidator() {
        return validator();
    }




    /*@Override
    public void configureDefaultServletHandling (
    DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
    }*/
    @Override
    public void addResourceHandlers(final ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resource/**").addResourceLocations("/resources/");
    }
    @Bean
    TilesConfigurer tilesConfigurer()
    {
        TilesConfigurer tiles = new TilesConfigurer();
        tiles.setDefinitions(new String[] {
                "/WEB-INF/tiles/definition/tile-definition.xml"
        });
        tiles.setCheckRefresh(true);
        return tiles;
    }

    @Bean
    public ViewResolver tilesViewResolver() {
        TilesViewResolver tv = new TilesViewResolver();
        tv.setOrder(-2);
        return  tv;
    }
    @Bean
    public ResourceBundleMessageSource messageSource()
    {
        ResourceBundleMessageSource rb = new ResourceBundleMessageSource();
        rb.setBasename("messages");
        return rb;
    }
    @Bean
    public StandardServletMultipartResolver multipartResolver()
    {
        return new StandardServletMultipartResolver();
    }
@Bean
public ContentNegotiatingViewResolver contentResolver()
{
    ContentNegotiatingViewResolver cn = new ContentNegotiatingViewResolver();


    List<View> listOfViews = new ArrayList<View>();
    listOfViews.add(jsonView());
    listOfViews.add(xmlView());

    cn.setDefaultViews(listOfViews);


    return cn;
}

@Bean
public MappingJackson2JsonView jsonView()
{
    MappingJackson2JsonView mj= new MappingJackson2JsonView();
    mj.setPrettyPrint(true);
    return mj;
}



@Bean
public MarshallingView xmlView()
{
    Jaxb2Marshaller ja = new Jaxb2Marshaller();
    ja.setClassesToBeBound(Product.class);

    MarshallingView mv = new MarshallingView(ja);

    return mv;
}
@Bean
public Validator validator()
{
    LocalValidatorFactoryBean lv = new LocalValidatorFactoryBean();
    lv.setValidationMessageSource(messageSource());
    return lv;
}

}