我正在使用Spring Boot 2.0 Spring Webflux构建一个利用zero-copy NIO功能的文件控制器 . 我还想发送自定义响应头（用于响应缓存等）
代码如下所示：
@RestController
@RequestMapping("/file")
public class FileController {
@GetMapping(value = "/{fileName:.+}")
public Mono<ServerResponse> getFile(@PathVariable("fileName") String fileName) {
Resource body = new ClassPathResource(fileName);
return ServerResponse.ok()
.header(HttpHeaders.CONTENT_DISPOSITION, String.format("inline; filename=\"%s\"", fileName))
.contentType(MediaType.TEXT_PLAIN)
.body(BodyInserters.fromResource(body));
}
}
但是当我从浏览器执行请求时，我得到以下错误：服务器日志：
2018-07-23 12:07:53.928 ERROR 9772 --- [ctor-http-nio-3] o.s.w.s.adapter.HttpWebHandlerAdapter : Unhandled failure: Type definition error: [simple type, class org.springframework.web.reactive.function.server.DefaultServerResponseBuilder$BodyInserterResponse]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.springframework.web.reactive.function.server.DefaultServerResponseBuilder$BodyInserterResponse and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS), response already set (status=null)
2018-07-23 12:07:53.928 WARN 9772 --- [ctor-http-nio-3] o.s.h.s.r.ReactorHttpHandlerAdapter : Handling completed with error: Type definition error: [simple type, class org.springframework.web.reactive.function.server.DefaultServerResponseBuilder$BodyInserterResponse]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.springframework.web.reactive.function.server.DefaultServerResponseBuilder$BodyInserterResponse and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)
我不知道这里出了什么问题 . 如果我从控制器方法返回 Mono<Resource> ，那么一切正常但是我放松了提供客户响应头的灵活性 .
对此有任何帮助表示赞赏 .
1 回答
ServerResponse应仅与Spring WebFlux功能一起使用 - 对于具有注释模型的用例，ResponseEntity是正确的选择 .因为WebFlux注释模型不能识别
ServerResponse类型，所以假设它应该序列化它（在这里，与Jackson一起） .