Spring HATEOAS PagedResource在JSON输出中不显示属性或任何链接

Question

谁能告诉我为什么我在JSON中只看到值而不是属性：value。我正在使用下面的代码

@ResponseBody
@RequestMapping(method = RequestMethod.GET, value = "/search")
PagedResources<Resource<Order>> search(@Valid OrderSearch search,
            @SortDefault(sort = "poNumber", direction = DESC) Pageable pageable) {
    Page<Order> orders = orderService.searchOrders(search, pageable);
    return pagedAssembler.toResource(orders);
}

我也没有看到任何链接，也没有发现如果我缺少任何配置，这里是JSON输出

[如何从Spring数据中正确使用PagedResourcesAssembler？

OrderResourceAssembler.java

公共类OrderResourceAssembler扩展ResourceAssemblerSupport

public OrderResourceAssembler() {
    super(OrderController.class, OrderResource.class);
}


/**
 * @see org.springframework.hateoas.ResourceAssembler#toResource(java.lang.Object)
 */
@Override
public OrderResource toResource(Order entity) {
    OrderResource orderResource = null;
    if (entity != null) {
        orderResource = createResourceWithId(
                entity.getPurchaseOrderNumber(), entity);
        orderResource.setPurchaseOrderNumber(entity
                .getPurchaseOrderNumber());
        orderResource.setAmount(entity.getAmount());
        orderResource.setEndUser(entity.getEndUser());
        orderResource.setPartner(entity.getPartner());
        orderResource.setPayload(entity.getPayload());
        orderResource.setProcessStatus(entity.getProcessStatus());
        orderResource.setQuoteNumber(entity.getQuoteNumber());
        orderResource.setQuoteStatus(entity.getQuoteStatus());
        orderResource.setReceivedDate(entity.getReceivedDate());
        orderResource.setRegion(entity.getRegion());
        orderResource.setSalesOrderNumber(entity.getSalesOrderNumber());
        orderResource.setShipTo(entity.getShipTo());
        orderResource.setShipToCustomer(entity.getShipToCustomer());
        orderResource.setType(entity.getType());
    }
    return orderResource;
}

公共类OrderController{

@Autowired
private OrderService orderService;

@Autowired
private OrderResourceAssembler orderAssembler;

@Autowired
private PagedResourcesAssembler<Order> pagedAssembler;

@requestmapping（方法=requestmethod.get,value=“/search”）@responseBody PagedResources search(@valid OrderSearch search,@pageabledefault(page=1,value=integer.max_value)@sortdefault(sort=“ponumber”,direction=sort.direction.desc）可分页可分页）{page orders=orderservice.searchOrders（搜索，分页）；return pagedassembler.toResource（orders,

当我尝试访问url时，将执行存储库查询，但得到ClassCastException

java.lang.ClassCastException:[ljava.lang.Object；不能在com.mycomp.it.eis.channelTracker.api.resource.orderResourceAssembler.toResource(orderResourceAssembler.java:8)在org.springframework.data.web.pagedResourcesAssembler.creat.springframework.data.web.pagedResourcesAssembler.java:122)在：89）

我不确定问题出在哪里，下面是我的servlet配置

<bean
    class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="webBindingInitializer">
            <bean
                class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
                <property name="conversionService" ref="conversionService" />
            </bean>
        </property>
        <property name="messageConverters">
            <list>
                <bean
                    class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
            </list>
        </property>
        <property name="customArgumentResolvers">
            <list>
                <bean class="org.springframework.data.web.PageableArgumentResolver" />
            </list>
        </property>
    </bean>

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

   <bean  class="org.springframework.data.web.PagedResourcesAssembler">
        <constructor-arg>
            <bean class="org.springframework.data.web.HateoasPageableHandlerMethodArgumentResolver" />
        </constructor-arg>
        <constructor-arg>
            <null />
        </constructor-arg>
    </bean>
   <bean class="org.springframework.data.web.config.SpringDataWebConfiguration" /> 

OrderResourceAssembler的bean配置

class="com.mycomp.it.eis.channeltracker.api.resource.OrderResourceAssembler"/>

你能告诉我你缺少什么吗

Answer 1

用以下类替换OrderResourceAssembler类：

@Component
public class OrderResourceAssembler implements ResourceAssembler<Order, Resource<Order>> {

    @Autowired EntityLinks entityLinks;

    @Override
    public Resource<Order> toResource(Order order) {
        Resource<Order> resource = new Resource<Order>(order);

        final LinkBuilder lb = 
        entityLinks.linkForSingleResource(Order.class, order.getId());

        resource.add(lb.withSelfRel());
        // here is where you have to add you classes represented as links, like partner, endUser, etc.
        resource.add(lb.slash("linkOne").withRel("linkOne"));
        resource.add(lb.slash("linkTwo").withRel("linkTwo"));                                

        return resource;
    }
}