如何使用Spring Boot WebClient收集分页的API响应？

我有一个来自URL的分页响应,我想继续点击从上一个响应中获得的下一个页面URL,并继续收集项目,直到我的响应中没有“ nextPage” URL.如何使用WebFlux的Spring Boot WebClient以无阻碍的方式以反应方式实现此目标？

Request1: 

    GET /items
    response: 
    {
        items: [...]
        nextPage: "/items?page=2"
    }


    Request2: 

    GET /items?page=2
    response: 
    {
        items: [...]
        nextPage: "/items?page=3"
    }


    Request3: 

    GET /items?page=3
    response: 
    {
        items: [...]
        nextPage: null
    }

在这里,我创建了模拟网址
https://karthikdivi.com/apps/paginatedReviews/withNextPageTokens/items
https://karthikdivi.com/apps/paginatedReviews/withNextPageTokens/items?page=2
https://karthikdivi.com/apps/paginatedReviews/withNextPageTokens/items?page=3

如何以无障碍方式从上述响应中提取所有项目？

解决方法:

使用扩展,可以实现这一点.
根据您提供的模拟网址.

public Mono<List<Item>> getItems() {
    String url = "https://karthikdivi.com/apps/paginatedReviews/withNextPageTokens/items";

    return fetchItems(url).expand(response -> {
        if (response.getNextPage() == null) {
            return Mono.empty();
        }
        return fetchItems(response.getNextPage());
    }).flatMap(response -> Flux.fromIterable(response.getItems())).collectList();
}

private Mono<Response> fetchItems(String url) {

         return client.get().uri(url).retrieve()
                    .bodyToMono(Response.class);
    }

标签：project-reactor,spring-webflux,spring-boot,reactive-programming,spring
来源： https://codeday.me/bug/20191024/1924251.html