我正在尝试在 spring-boot (1.2.2) 上返回图像
我应该如何设置内容类型？
以下内容都不适合我（这意味着响应标头根本不包含“内容类型”标头）：
@RequestMapping(value = "/files2/{file_name:.+}", method = RequestMethod.GET)
public ResponseEntity<InputStreamResource> getFile2(final HttpServletResponse response) throws IOException {
InputStream is = //someInputStream...
org.apache.commons.io.IOUtils.copy(is, response.getOutputStream());
response.setContentType("image/jpeg");
InputStreamResource inputStreamR = new InputStreamResource(is);
return new ResponseEntity<>(inputStreamR, HttpStatus.OK);
}
@RequestMapping(value = "/files3/{file_name:.+}", method = RequestMethod.GET)
public HttpEntity<byte[]> getFile3() throws IOException {
InputStream is = //someInputStream...
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_JPEG);
return new HttpEntity<>(IOUtils.toByteArray(is), headers);
}
首先，您需要申请@ResponseBody注释除了@RequestMapping，除非你正在使用@RestController在班级层面而不仅仅是@Controller。另外，请尝试produces的元素@RequestMapping e.g.
@RequestMapping(value = "/files2/{file_name:.+}", method = RequestMethod.GET, produces = {MediaType.IMAGE_JPEG_VALUE})
这应该“缩小主要映射范围”并确保设置正确的内容类型。请参阅文档：http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#mvc-ann-requestmapping-products http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#mvc-ann-requestmapping-produces
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