Spring Cloud Open Feign：ByteArrayResource的解码器

Question

我在一个接口中定义了一个Spring Boot Restendpoint来下载一个映像

@GetMapping(value = "/{name}")
ResponseEntity<ByteArrayResource> getFileByName(@PathVariable("name") String name);

Feign.builder()
    .client(new ApacheHttpClient())
    .contract(new SpringMvcContract())
    .decoder(new JacksonDecoder())
    .encoder(new JacksonEncoder())  
    .target(clazz, url)

com.fasterxml.jackson.core.JsonParseException: Unexpected character ('�' (code 65533 / 0xfffd)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
 at [Source: (BufferedReader); line: 1, column: 2]

Answer 1

我写了自己的小解码器，问题就解决了。下面是解码器

private Decoder byteArrayResourceDecoder() {
        Decoder decoder = (response, type) -> {
            if (type instanceof Class && ByteArrayResource.class.isAssignableFrom((Class) type)) {
                return StreamUtils.copyToByteArray(response.body().asInputStream());
            }
            return new JacksonDecoder().decode(response, type);
        };

        return new ResponseEntityDecoder(decoder);
    }

希望这个模板能帮助其他有类似问题的人。会期望Feign拥有支持所有返回类型的解码器。