Spring WebClient PageImpl 内容缺少字段

Question

我尝试通过 WebClient 从另一个 microservice.If 检索一个页面我直接用 Postman 请求这个 MS，我在页面内得到 content 的“类型”等信息.但是，如果我通过 webClient 请求 MS，“类型”将从 content（以及其他一些字段）中消失。内容是一个抽象列表 class account with 'type' as JsonSubTypes。
有人能找到错误吗，为什么是“类型”-attrib。消失了？

来自http://localhost:8080/api/v1/accounts

的回应

{
    "content": [
        {
            "type": "savingsBook",
            "id": 108,
            "accountNumber": 99781944,
            ...
        }
    ], "pageable": {
        ...
    }, "totalPages": ...
    ...
}

来自http://localhost:8081/accounts

的回应

{
    "content": [
        {
            "id": 108,
            "accountNumber": 99781944,
            ...
        }
    ], "pageable": {
        ...
    }, "totalPages": ...
    ...
}

代码片段：

8080 的账户管理员

@RequestMapping(method = RequestMethod.GET, produces = "application/json")
public <T extends Account> Page<T> getAccounts(@RequestParam(value = "page", required = false) Integer page, @RequestParam(value = "pageSize", required = false) Integer pageSize, @RequestParam(value = "sortBy", required = false) String sortBy) {
    if (page == null) {
        page = 0;
    }
    if (pageSize == null) {
        pageSize = 10;
    }
    if (sortBy == null) {
        Page<T> p = accountService.getAccounts(page, pageSize);
        return new PageImpl<T>(p.getContent(), p.getPageable(), p.getTotalElements()) {};

    } else {
        Sort sort = Sort.by(sortBy);
        Page<T> p = accountService.getAccounts(page, pageSize, sort);
        return new PageImpl<T>(p.getContent(), p.getPageable(), p.getTotalElements()) {};
    }
}

8081 账户管理员

@GetMapping
public  <T extends Account> Page<T> getAllAccounts(@RequestParam(value = "page", required = false) Integer page, 
                                                   @RequestParam(value = "pageSize", required = false) Integer pageSize,
                                                   @RequestParam(value = "sortBy", required = false) String sortBy) {   
     if (page == null) {
         page = 0;
     }
     if (pageSize == null) {
         pageSize = 10;
     }
     if (sortBy == null) {
         return accountService.getAllAccounts(page, pageSize);
     } else {
         return accountService.getAllAccounts(page, pageSize, sortBy);
     }
}

8081 账户服务

public <T extends Account> Page<T> getAllAccounts(Integer pageNumber, Integer pageSize) {
    ParameterizedTypeReference<CustomPageImpl<T>> typeReference = new ParameterizedTypeReference<CustomPageImpl<T>>(){};
    System.out.println("Anfrage an: " + addr + "/accounts/");
    System.out.println(client.get().uri("/accounts/").retrieve().bodyToMono(typeReference).block().getContent());
    Page<T> prodData = (CustomPageImpl<T>)(client.get().uri("/accounts/").retrieve().bodyToMono(typeReference).block());
    return prodData;
}

CustomPageImpl（从另一个 Whosebug 得到的-Post）

public class CustomPageImpl<T> extends PageImpl<T> {
    private static final long serialVersionUID = 1L;

    @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
    public CustomPageImpl(@JsonProperty("content") List<T> content,
            @JsonProperty("number") int number,
            @JsonProperty("size") int size,
            @JsonProperty("totalElements") Long totalElements,
            @JsonProperty("pageable") JsonNode pageable,
            @JsonProperty("last") boolean last,
            @JsonProperty("totalPages") int totalPages,
            @JsonProperty("sort") JsonNode sort,
            @JsonProperty("first") boolean first,
            @JsonProperty("numberOfElements") int numberOfElements){
        super(content, PageRequest.of(number, size) , totalElements);
    }
    public CustomPageImpl(List<T> content, Pageable pageable, long total) {
        super(content, pageable, total);
    }

    public CustomPageImpl(List<T> content) {
        super(content);
    }

    public CustomPageImpl() {
        super(new ArrayList<>());
    }
}

Answer 1

我自己找到了这个问题的答案。

问题在于，Account 是抽象的并且具有 json 子类型。通过用 public class CustomPageImpl<T extends Account> extends PageImpl<T> 替换 public class CustomPageImpl<T> extends PageImpl<T> 我能够解决这个问题。现在我按计划收到了类型。

Spring WebClient PageImpl 内容缺少字段

Spring WebClient PageImpl Content is missing field

java

spring

spring-boot

webclient

pageable