不同服务之间通过feign实现Response传递

Myth丶恋晨 2023-10-08 20:37 8阅读 0赞

order->feign->product

> 调用方controller

@Slf4j
    @RestController
    @RequestMapping("/order")
    public class OrderController {
    
        @Autowired
        private ProductService productService;
    
        @RequestMapping("/down")
        public void testDownload() throws IOException {
    
            Response res = productService.down();
            InputStream inputStream = res.body().asInputStream();
    
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            HttpServletResponse response = attributes.getResponse();
    
            response.setContentType("application/x-download;charset=" + "utf-8");
            response.addHeader("Content-Disposition", "attachment;filename=" + "test.docx");
    
            try {
                ServletOutputStream outputStream = response.getOutputStream();
                IOUtils.copy(inputStream, outputStream);
                outputStream.flush();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
    
        }
    
    }

> 调用方feign：

//value用于指定调用nacos下哪个微服务
    //fallback 指定当调用出现问题之后,要进入到哪个类中的同名方法之下执行备用逻辑
    @FeignClient(
            value = "service-product"//,
            //fallback = ProductServiceFallback.class,
    )
    public interface ProductService {
    
    
        @PostMapping("/product/down")
        feign.Response down();
    
    }

> 服务提供方
> 
> void返回即可

@Slf4j
    @RestController
    @AllArgsConstructor
    @RequestMapping("/product")
    public class ProductController {
    
    
        @PostMapping("/down")
        public void down() {
    
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            HttpServletResponse response = attributes.getResponse();
    
            response.setContentType("application/x-download;charset=" + "utf-8");
            response.addHeader("Content-Disposition", "attachment;filename=" + "test.docx");
    
            File file = new File("D:\\test\\test.docx");
            FileInputStream inputStream = null;
    
            try {
                inputStream = new FileInputStream(file);
                ServletOutputStream outputStream = response.getOutputStream();
                IOUtils.copy(inputStream, outputStream);
                outputStream.flush();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
    
        }
    
    }