Spring Boot setContentType不起作用

小编典典

Spring Boot setContentType不起作用

spring-boot

我正在尝试在spring-boot（1.2.2）上返回映像。
如何设置内容类型？以下任何一种都不适合我（这意味着响应头完全不包含“ content-type”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);
}

阅读 1085

2020-05-30

共1个答案

小编典典

知道了…必须添加ByteArrayHttpMessageConverter到WebConfiguration课程：

@Configuration
@EnableWebMvc
@ComponentScan
public class WebConfiguration extends WebMvcConfigurerAdapter {

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> httpMessageConverters) {
    httpMessageConverters.add(new ByteArrayHttpMessageConverter());
}
}

然后，我的第二次尝试（getFile3()）工作正常

2020-05-30