设置JPA Pageable对象的默认页面大小 [英] Set default page size for JPA Pageable Object

问题描述

我有一个PagingandSorting存储库，该存储库具有接受可分页对象的方法. 我还有一个控制器，可以通过URL接受可分页的对象.

I have a PagingandSorting Repository which has a method that accecpts a pageable object. I also have a controller that accepts a pageable object through the URL.

我的用例是，如果用户在URL中指定页面大小参数，则我必须将该值用作可分页对象.如果他不提及，则将默认值设为50.

My use case is that, if a user specifies a page size parameter in the URL i must take that value for the pageable object. If he does not mention take a default value of 50.

但是可分页对象现在默认为20.

But the pageable object defaults to 20 right now.

任何建议都会帮助

推荐答案

如果您正在谈论Spring Data PagingAndSortingRepository，则可以通过在Controller方法上使用@PageableDefault来设置默认页面大小，如下所示:

If you are talking about a Spring Data PagingAndSortingRepository you can set the default page size by using the @PageableDefault on a Controller method as follows:

public String listClients(@ModelAttribute FilterForm form, Model model, WebRequest request, @PageableDefault(sort = { "surname",
            "forename", "address.town" }, value = 50) Pageable pageable) {

    }

或者您可以在Spring配置中使用以下配置全局默认值，如下所示在XML和Java配置中.

Or you can configure a global default using the following in your Spring config as shown below in both XML and Java config.

请注意，Spring Data的较新版本使用基于零的页面索引，而较旧的版本将1用于第一页.如果您的UI分页库期望首页为1，则可以将oneIndexedParameters属性设置为true:

Note that newer versions of Spring Data use zero based page indexing while older versions used 1 for the first page. If your UI paging library expects 1 as first page then you can set the oneIndexedParameters property to true:

• 配置是否在以下位置公开并假定基于1的页码索引 请求参数.默认为false，表示页码为0 在请求中等于第一页.如果将其设置为true，则页面 请求中的数字1将被视为第一页.

  Configures whether to expose and assume 1-based page number indexes in the request parameters. Defaults to false, meaning a page number of 0 in the request equals the first page. If this is set to true, a page number of 1 in the request will be considered the first page.

  参数:oneIndexedParameters-要设置的oneIndexedParameters

  Parameters: oneIndexedParameters - the oneIndexedParameters to set

  • • public void setFallbackPageable(Pageable fallbackPageable)

    在没有PageableDefault或 可以设置PageableDefaults(后者仅在旧版模式下受支持) 在要解析的方法参数中找到.如果您将其设置为null， 请注意，您的控制器方法将在其中传递空值 如果在请求中找不到可分页数据.请注意，这样做 将要求您向bot提供页面和size参数以及 请求，因为任何参数都没有默认值 可用.

    Configures the Pageable to be used as fallback in case no PageableDefault or PageableDefaults (the latter only supported in legacy mode) can be found at the method parameter to be resolved. If you set this to null, be aware that you controller methods will get null handed into them in case no Pageable data can be found in the request. Note, that doing so will require you supply bot the page and the size parameter with the requests as there will be no default for any of the parameters available.

    参数:fallbackPageable-用作常规的Pageable 后备.

    Parameters: fallbackPageable - the Pageable to be used as general fallback.

    在XML中，如下所示:

    In XML this looks like the following then:

    <mvc:annotation-driven>
        <mvc:argument-resolvers>
            <bean class="org.springframework.data.web.PageableHandlerMethodArgumentResolver">
                <property name="oneIndexedParameters" value="true"/>
                <property name="fallbackPageable">
                    <bean class="org.springframework.data.domain.PageRequest">
                        <constructor-arg name="page" value="1" />
                        <constructor-arg name="size" value="10" />
                    </bean>
                </property>
            </bean>
        </mvc:argument-resolvers>
    </mvc:annotation-driven>
    

    在Java Config中，如下所示:

    In Java Config this looks like the below:

    @Configuration
    public class WebConfig extends WebMvcConfigurerAdapter {
    
    
        @Override
        public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
            PageableHandlerMethodArgumentResolver resolver = new PageableHandlerMethodArgumentResolver();
            resolver.setOneIndexedParameters(true);
            resolver.setFallbackPageable(new PageRequest(1, 20));
            argumentResolvers.add(resolver);
            super.addArgumentResolvers(argumentResolvers);
        }
    }
    

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