Spring RestTemplate - BufferingClientHttpRequestFactory & SimpleClientHttpRequestFactory

Question

我在使用 Spring 构建的 Rest 客户端之一中看到了以下代码。此 Rest Client 存在于 REST 服务中并正在调用另一个 REST 服务。此声明的目的是什么？

return new BufferingClientHttpRequestFactory(new SimpleClientHttpRequestFactory())

Answer 1

BufferingClientHttpRequestFactory is a decorator around ClientHttpRequestFactory, which the RestTemplate uses to create ClientHttpRequests which faciliate HTTP communication. This decorator in particular provides buffering of outgoing/incoming streams. This wrapper/decorator also allows multiple reads of the response body, which you won't be able to do if you only use SimpleClientHttpRequestFactory or HttpComponentsClientHttpRequestFactory 没有这个包装。

SimpleClientHttpRequestFactory is an implementation of ClientHttpRequestFactory, which uses JDK facilities (classes from java.net package) and therefore does not depend on third party libraries, such as Apache HttpComponents HTTP client, which is required by another implementation HttpComponentsClientHttpRequestFactory.