RestTemplate 发送文件

resttemplate 发送 inputstream流到服务端

客户端

RestTemplate restTemplate = new RestTemplate();

SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
requestFactory.setBufferRequestBody(false);
restTemplate.setRequestFactory(requestFactory);

File file = new File('C:\\Users\\xx.png')
InputStream inputStream = new FileInputStream(file)

MultiValueMap<String,Object> parts = new LinkedMultiValueMap<>();
try {
parts.add("file", new MultipartFileResource(inputStream,"test"));
} catch (IOException e) {
throw new RuntimeException(e);
}
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);
HttpEntity<MultiValueMap<String,Object>> request = new HttpEntity<>(parts, headers);
def ret =restTemplate.exchange("http://localhost:9303/upload", HttpMethod.POST, request, Void.class);

private class MultipartFileResource extends InputStreamResource {
private String filename;

public MultipartFileResource(InputStream inputStream, String filename) {
super(inputStream);
this.filename = filename;
}
@Override
public String getFilename() {
return this.filename;
}
@Override
public long contentLength() throws IOException {
return -1; // we do not want to generally read the whole stream into memory ...
}
}

controller

@PostMapping("/upload")
public Object upload(HttpServletRequest request, MultipartFile file) {
...
}