RestTemplate restTemplate // = ...;
// Optional Accept header
RequestCallback requestCallback = request -> request.getHeaders()
.setAccept(Arrays.asList(MediaType.APPLICATION_OCTET_STREAM, MediaType.ALL));
// Streams the response instead of loading it all in memory
ResponseExtractor<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：
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