SpringBoot接口中如何直接返回图片数据

<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.3</version>
        </dependency>
        <!-- Https://mvnrepository.com/artifact/com.google.zxing/javase -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.3</version>
        </dependency>

Map hints = new HashMap();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
hints.put(EncodeHintType.MARGIN, 2);
BitMatrix qrcode = new QRCodeWriter().encode(href, BarcodeFORMat.QR_CODE, 300, 300);
//网上的方案大多数都是通过io流写到文件系统，
MatrixToImageWriter.writeToStream(qrcode,"png",response.getOutputStream());

@GetMapping(value = "/qrcode", produces = MediaType.IMAGE_JPEG_VALUE)
@ResponseBody
public BufferedImage generateQRCode() {
        //返回BufferedImage的对象
    }

@Bean
    public BufferedImageHttpMessageConverter addConverter(){
        return new BufferedImageHttpMessageConverter();
    }

    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(new BufferedImageHttpMessageConverter());
    }

@RestController
@Slf4j
@api(tags = swaggerConfig.TAG_IMAGE)
@RequestMapping(SwaggerConfig.TAG_IMAGE)
public class ImageController {
    @Resource
    private HttpServletResponse response;
    @GetMapping(value = "/getImage")
    @ApiOperation("获取图片-以ImageIO流形式写回")
    public void getImage() throws IOException {
        OutputStream os = null;
        try {
//        读取图片
            BufferedImage image = ImageIO.read(new FileInputStream(new File("F:\\谷歌下载\\未命名文件.png")));
            response.setContentType("image/png");
            os = response.getOutputStream();
            if (image != null) {
                ImageIO.write(image, "png", os);
            }
        } catch (IOException e) {
            log.error("获取图片异常{}",e.getMessage());
        } finally {
            if (os != null) {
                os.flush();
                os.close();
            }
        }
    }
}