Spring Data不处理Pageable action参数创建

Question

我有一个简单的控制器动作:

public class CategoriesController
{
    @RequestMapping(value = { "/", "" })
    public String list(
        Model model,
        @PageableDefault(size = CategoriesController.PAGE_LIMIT) Pageable pager
    )
    {
        // load page data
        Page<Category> page = this.categoryService.findAll(pager);

        /* action logic here */
    }
}

这是我的pom.xml片段:

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>3.2.4.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>3.2.4.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>3.2.4.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-commons</artifactId>
        <version>1.6.4.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-jpa</artifactId>
        <version>1.5.0.RELEASE</version>
    </dependency>

添加到我之后applicationContext.xml:

<bean class="org.springframework.data.web.config.SpringDataWebConfiguration"/>

我有以下错误:

org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.data.domain.Pageable]: Specified class is an interface

Spring Data本身运行正常,JPA存储库正在运行.但到目前为止,我在控制器中手写了分页(自己计算页面,PageRequest手工创建对象).我想利用Spring Data网络附加功能,但是由于某些原因它们对我不起作用... org.springframework.data.web.PageableArgumentResolver手工过时注册部分使它工作,但不完全,但仍然,我认为这甚至不应该是一个办法.

启用调试记录器后,org.springframework我看到:

01:37:33.850 [localhost-startStop-1] DEBUG org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader - Registering bean definition for @Bean method org.springframework.data.web.config.SpringDataWebConfiguration.pageableResolver()

所以它已注册 - 任何想法为什么它不起作用？

Answer 1

您的问题是您正在尝试混合XML配置和基于Java Config的配置.在这种特殊情况下,这是行不通的.配置类中的bean将被实例化,但就是它,它们没有注册到您的<mvc:annotation-driven />配置中.

您必须手动将bean添加到ConversionService您和您的RequestMappingHandlerMapping.要么我们的交换机,至少你的DispatcherServlet配置到Java Config.

在XML中,您可以使用<mvc:argument-resolvers />标记配置其他参数解析器.(这模仿了配置SpringDataWebConfiguration).

<mvc:annotation-driven>
    <mvc:argument-resolvers>
        <ref bean="sortResolver"/>
        <ref bean="pageableResolver" />
    </mvc:argument-resolvers>
</mvc:annotation-driven>

<bean id="sortResolver" class="org.springframework.data.web.SortHandlerMethodArgumentResolver" />
<bean id="pageableResolver" class="org.springframework.data.web.PageableHandlerMethodArgumentResolver">
    <constructor-arg ref="sortResolver" />
</bean>

然而,SpringDataWebConfiguration它只有这两个解析器,它也注册了一个DomainClassConverter.如果您还想使用它,则需要一些额外的配置.

<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean" />

<bean class="org.springframework.data.repository.support.DomainClassConverter">
   <constructor-arg ref="conversionService" />
</bean>

<mvc:annotation-driven conversion-service="conversionService">
    <mvc:argument-resolvers>
        <ref bean="sortResolver"/>
        <ref bean="pageableResolver" />
    </mvc:argument-resolvers>
</mvc:annotation-driven>

<bean id="sortResolver" class="org.springframework.data.web.SortHandlerMethodArgumentResolver" />
<bean id="pageableResolver" class="org.springframework.data.web.PageableHandlerMethodArgumentResolver">
    <constructor-arg ref="sortResolver" />
</bean>