Question

我使用Spring 4.1.6.RELEASE和Spring Data Jpa 1.8.0.RELEASE。我有org.springframework.data.domain.Pageable bean创建的问题。它在我的控制器中使用：

@Controller
public class ItemsController {

    @Autowired
    ProductService itemsService;

    @RequestMapping(value = "/openItemsPage")
    public String openItemsPage() {
        return "items";
    }

    @RequestMapping(value = "/getItems", method = RequestMethod.GET)
    @ResponseBody
    public Item[] getItems(Pageable pageable) {

        return itemsService.getItems(pageable);
    }
}

此外，我的应用程序上下文中还有下一个xml配置：

<context:component-scan base-package="com.mobox.controller" />

<mvc:annotation-driven>
    <mvc:argument-resolvers>
        <beans:bean id="sortResolver"
                class="org.springframework.data.web.SortHandlerMethodArgumentResolver" />
        <beans:bean
                class="org.springframework.data.web.PageableHandlerMethodArgumentResolver">
            <beans:constructor-arg ref="sortResolver" />
        </beans:bean>
    </mvc:argument-resolvers>
</mvc:annotation-driven>

最后我从客户那里做了下一次重新计划：

   $.ajax({
        type: "GET",
        url: "getProducts?page=0&size=100",
        .....

在tomcat日志中，我看到下一个：

    SEVERE: Servlet.service() for servlet [appServlet] in context with path [/a2delivery-web] threw exception [Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.domain.Pageable]: Specified class is an interface] with root cause
org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.domain.Pageable]: Specified class is an interface
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:101)
    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:137)
    at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:80)
    at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:106)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:77)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:129)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    ....................

请帮我解决这个问题，谢谢！

Answer 1

最简单的方法是在配置中设置@EnableSpringDataWebSupport。或者，在基于纯XML的配置中，将SpringDataWebConfiguration声明为Spring bean。

这将确保正确注册必要的HandlerMethodArgumentResolver。

Answer 2

将以下内容添加到您的测试类：

@Inject
private PageableHandlerMethodArgumentResolver pageableArgumentResolver;

PageableHandlerMethodArgumentResolver

并在MockMvc设置期间配置它：

@Before
public void setup() {
    ...
    this.mockMvc = MockMvcBuilders.standaloneSetup(resource)
        .setCustomArgumentResolvers(pageableArgumentResolver)
        .build();
}

Answer 3

只是为了添加Tom Van Rossom的回复，如果你使用@RunWith（MockitoJUnitRunner.class），你可以在初始化mockMvc时创建一个PageableHandlerMethodArgumentResolver实例（就像Loren所提到的那样）.Eg

mockMvc = MockMvcBuilders.standaloneSetup(restController)
            .setCustomArgumentResolvers(new PageableHandlerMethodArgumentResolver())
            .build();

Answer 4

除了其他可能对您有用的答案之外的替代方法。

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
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        <div class="styled-select">
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                <option data-onetimeprice="20.00" data-label="1 Extra Remote" value="1_extra_remotes">1 Extra Remote (+$20)</option>
                <option data-onetimeprice="40.00" data-label="2 Extra Remotes" value="2_extra_remotes">2 Extra Remotes (+$40)</option>
                <option data-onetimeprice="60.00" data-label="3 Extra Remotes" value="3_extra_remotes">3 Extra Remotes (+$60)</option>
                <option data-onetimeprice="80.00" data-label="4 Extra Remotes" value="4_extra_remotes">4 Extra Remotes (+$80)</option>
                <option data-onetimeprice="100.00" data-label="5 Extra Remotes" value="5_extra_remotes">5 Extra Remotes (+$100)</option>
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            </select>
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    </label>
</div>

Answer 5

getItems方法中使用的Pageable是一个接口，spring将无法实例化它。

你可以

提供Pageable的Java bean样式实现，并在getItems方法中使用而不是Pageable。
或使用ModelAttribute创建Pageable对象（例如，PageRequest）。以下是有关ModelAttribute的更多详细信息的链接：What is @ModelAttribute in Spring MVC?

无法实例化Pageable bean

5 个答案: