使用 Spring RestTemplate 呼叫 rest 服務時自定義請求頭（custom HTTP headers）
阿新 • • 發佈：2019-02-03
在 Spring 3.0 中可以通過 HttpEntity 物件自定義請求頭資訊，如：
在 Spring 3.1 中有了一個更強大的替代介面 ClientHttpRequestInterceptor，這個介面只有一個方法：intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution)，下面是一個例子：private static final String APPLICATION_PDF = "application/pdf"; RestTemplate restTemplate = new RestTemplate(); @Test public void acceptHeaderUsingHttpEntity() throws Exception { HttpHeaders headers = new HttpHeaders(); headers.setAccept(singletonList(MediaType.valueOf(APPLICATION_PDF))); ResponseEntity<byte[]> response = restTemplate.exchange("http://example.com/file/123", GET, new HttpEntity<byte[]>(headers), byte[].class); String responseText = PdfTextExtractor.getTextFromPage(new PdfReader(response.getBody()), 1); assertEquals("Some text in PDF file", responseText); }
private static final String APPLICATION_PDF = "application/pdf"; RestTemplate restTemplate = new RestTemplate(); @Test public void acceptHeaderUsingHttpRequestInterceptors() throws Exception { ClientHttpRequestInterceptor acceptHeaderPdf = new AcceptHeaderHttpRequestInterceptor( APPLICATION_PDF); restTemplate.setInterceptors(singletonList(acceptHeaderPdf)); byte[] response = restTemplate.getForObject("http://example.com/file/123", byte[].class); String responseText = PdfTextExtractor.getTextFromPage(new PdfReader(response), 1); assertEquals("Some text in PDF file", responseText); } class AcceptHeaderHttpRequestInterceptor implements ClientHttpRequestInterceptor { private final String headerValue; public AcceptHeaderHttpRequestInterceptor(String headerValue) { this.headerValue = headerValue; } @Override public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException { HttpRequestWrapper requestWrapper = new HttpRequestWrapper(request); requestWrapper.getHeaders().setAccept(singletonList(MediaType.valueOf(headerValue))); return execution.execute(requestWrapper, body); } }