Question

要下载文件，我将“ Content-Disposition”添加到我的responseHeader中，但是它不起作用。

响应将没有任何添加的属性。

    @Bean
    public ExpressionParser fileParser() {
        return new SpelExpressionParser();
    }

    @Bean
    public HeaderMapper<HttpHeaders> fileHeaderMapper() {
        return new DefaultHttpHeaderMapper();
    }

@Bean
    public IntegrationFlow httpGetFileDownload() {
        return IntegrationFlows.from(
                Http.inboundGateway("/api/files/download/{id}")
                        .requestMapping(r -> r.methods(HttpMethod.GET))
                        .statusCodeExpression(fileParser().parseExpression("T(org.springframework.http.HttpStatus).BAD_REQUEST"))
                        .payloadExpression(fileParser().parseExpression("#pathVariables.id"))
                        .crossOrigin(cors -> cors.origin("*").exposedHeaders("Content-Disposition", "content-disposition"))
                        .headerMapper(fileHeaderMapper())
                )
                .channel("http.file.download.channel")
                .handle("fileEndpoint", "download")
                .get();
    }



public Message<?> download(Message<Long> msg){
...

return MessageBuilder
                    .withPayload(resource)
                    .copyHeaders(msg.getHeaders())
                    .setHeader(STATUSCODE_HEADER, HttpStatus.OK)
                    .setHeader(HttpHeaders.CONTENT_DISPOSITION,"attachment;filename=" + file.getName())
                    .setHeader(HttpHeaders.CONTENT_TYPE, mimeType)
                    .setHeader(HttpHeaders.CONTENT_LENGTH, (int)file.length())
                    .build();
}

我得到的是

缓存控制：“无缓存，无存储，最大年龄= 0，必须重新验证”
内容类型：“ application / json”
到期：“ 0”
编译指示：“无缓存”

Answer 1

您的问题DefaultHttpHeaderMapper默认为空。我认为可能是时候让ctor成为deprecated了，不允许在最终应用程序中使用它。或进行一些验证以拒绝仅空（未配置）的DefaultHttpHeaderMapper ...

如果您不自定义return new DefaultHttpHeaderMapper();，那么使用HttpRequestHandlingMessagingGateway有什么意义呢？ private HeaderMapper<HttpHeaders> headerMapper = DefaultHttpHeaderMapper.inboundMapper();中有一个默认值：

inboundMapper()

要解决您的问题，您肯定需要使用此/** * Factory method for creating a basic inbound mapper instance. * This will map all standard HTTP request headers when receiving an HTTP request, * and it will map all standard HTTP response headers when sending an HTTP response. * @return The default inbound mapper. */ public static DefaultHttpHeaderMapper inboundMapper() { DefaultHttpHeaderMapper mapper = new DefaultHttpHeaderMapper(); setupDefaultInboundMapper(mapper); return mapper; }工厂方法，该方法将执行以下操作：

setupDefaultInboundMapper()

{{1}}非常重要：它为我们带来了一组从请求映射到响应的标头。

如何在Spring Integration（DSL）中公开“ Content-Disposition”？

1 个答案: