这是我的方法。基于springJira问题的提示。
RestTemplate restTemplate // = ...;// Optional Accept headerRequestCallback requestCallback = request -> request.getHeaders() .setAccept(Arrays.asList(MediaType.APPLICATION_OCTET_STREAM, MediaType.ALL));// Streams the response instead of loading it all in memoryResponseExtractor<Void> responseExtractor = response -> { // Here I write the response to a file but do what you like Path path = Paths.get("some/path"); Files.copy(response.getBody(), path); return null;};restTemplate.execute(URI.create("www.something.com"), HttpMethod.GET, requestCallback, responseExtractor);从前面提到的吉拉问题：
请注意，你不能简单地从提取器返回InputStream，因为到execute方法返回时，基础连接和流已经关闭。
Update for Spring 5
Spring 5引入了WebClient允许异步（例如，非阻塞）http请求的类。从文档：
与RestTemplate相比，WebClient是：
- non-blocking, reactive, and supports higher concurrency with less hardware resources.
- provides a functional API that takes advantage of Java 8 lambdas.
- supports both synchronous and asynchronous scenarios.
- supports streaming up or down from a server.
