Spring Boot setContentType不起作用 [英] spring boot setContentType is not working

问题描述

我正在尝试在spring-boot（1.2.2）上返回映像。

如何设置内容类型？
以下内容都不对我有用（这意味着响应头完全不包含 content-type头）：

I'm trying to return an image on spring-boot (1.2.2)
How should I set the content-type? Non of the following are working for me (meaning that response headers are not containing 'content-type' header at all ):

    @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);
}

推荐答案

知道了...将 ByteArrayHttpMessageConverter 添加到 WebConfiguration 类：

Got it... Had to add ByteArrayHttpMessageConverter to WebConfiguration class:

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

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

然后我第二次尝试（ getFile3（））正常工作

And the then my second attempt (getFile3()) was working correctly

这篇关于Spring Boot setContentType不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！