Spring 集成 HttpRequestExecutingMessageHandler ContentType 问题

问题描述 投票:0回答:3

我面临 Spring Integration 的问题。我正在尝试通过 HttpRequestExecutingMessageHandler 执行休息调用。我的休息端点仅接受内容类型“application/json”。

问题在于 HttpRequestExecutingMessageHandler 正在以内容类型“text/plain;charset=UTF-8”发布。

@ServiceActivator(inputChannel = "transformRequestToJsonChannel", 
   outputChannel = "httpRequestOutChannel")
public Message<?> transformRequest(Message<DocumentConverterRequest> 
   message) 
{
  LOG.info("transforming document converter request to json: '{}'",         
  ObjectToJsonTransformer transformer = new ObjectToJsonTransformer();
  transformer.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);
  Object payload = transformer.transform(message).getPayload();
  LOG.info("payload: '{}'", payload.toString());
  return MessageBuilder.withPayload(payload).build();
}

@Bean
@ServiceActivator(inputChannel = "httpRequestOutChannel")
public HttpRequestExecutingMessageHandler outbound() {
  HttpRequestExecutingMessageHandler handler = new 
  HttpRequestExecutingMessageHandler(documentConverterRestUrl);
  handler.setHttpMethod(HttpMethod.POST);
  handler.setErrorHandler(httpResponseErrorHandler);
  handler.setExpectedResponseType(String.class);
  handler.setCharset(Charset.defaultCharset().name());
  HeaderMapper<HttpHeaders> mapper = new DefaultHttpHeaderMapper();
  HttpHeaders httpHeaders = new HttpHeaders();
  httpHeaders.add(HttpHeaders.CONTENT_TYPE, 
    MediaType.APPLICATION_JSON_VALUE);
  mapper.toHeaders(httpHeaders);
  handler.setHeaderMapper(mapper);
  handler.setOutputChannel(httpResponseChannel());
  return handler;
}

如何覆盖内容类型?

spring-boot spring-integration spring-integration-dsl spring-integration-http
3个回答
0
投票

这段代码什么也没做:

  HeaderMapper<HttpHeaders> mapper = new DefaultHttpHeaderMapper();
  HttpHeaders httpHeaders = new HttpHeaders();
  httpHeaders.add(HttpHeaders.CONTENT_TYPE, 
    MediaType.APPLICATION_JSON_VALUE);
  mapper.toHeaders(httpHeaders);

当我们收到响应时,会从

toHeaders()
调用
HttpRequestExecutingMessageHandler
。在代码中显式使用它确实没有用,尤其是在 bean 定义阶段以及当您忽略结果时。

您根本不需要使用显式的

HeaderMapper
:默认的就足够了。

ObjectToJsonTransformer
确实将
setContentType()
映射到它回复的消息的标题中:

if (headers.containsKey(MessageHeaders.CONTENT_TYPE)) {
        // override, unless empty
        if (this.contentTypeExplicitlySet && StringUtils.hasLength(this.contentType)) {
            headers.put(MessageHeaders.CONTENT_TYPE, this.contentType);
        }
}
else if (StringUtils.hasLength(this.contentType)) {
        headers.put(MessageHeaders.CONTENT_TYPE, this.contentType);
}

因此,有一个适当的内容类型可以映射。默认情况下

HttpRequestExecutingMessageHandler
使用:

/**
 * Factory method for creating a basic outbound mapper instance.
 * This will map all standard HTTP request headers when sending an HTTP request,
 * and it will map all standard HTTP response headers when receiving an HTTP response.
 * @return The default outbound mapper.
 */
public static DefaultHttpHeaderMapper outboundMapper() {

使用一组适当的标头来映射到 HTTP 请求和 HTTP 响应。

new DefaultHttpHeaderMapper()
只为地图带来一组空的标题。

请提出一个问题来改进 JavaDocs 和参考手册,以注意该类的默认构造函数不会将任何标头带到映射中。


0
投票
@Bean
@ServiceActivator(inputChannel = "httpRequestOutChannel")
public HttpRequestExecutingMessageHandler outbound() {
  HttpRequestExecutingMessageHandler handler = Http.outboundGateway(documentConverterRestUrl)
        .httpMethod(HttpMethod.POST)
        .messageConverters(new MappingJackson2HttpMessageConverter())
        .mappedRequestHeaders("Content-Type")
        .get();

        handler.setOutputChannel(httpResponseChannel());
        return handler;
}

我删除了 ObjectToJsonTransformer,因为

messageConverters(new MappingJackson2HttpMessageConverter())
正在做这些事情。

我还必须将

content-type
添加到我的消息标题中:
.setHeaderIfAbsent(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)


0
投票

如果我需要将 head 变量添加到 headMapper 中,我该怎么做? 【HttpRequestExecutingMessageHandler】没有getHeaderMap(),当我setHeaderMap()时,它不起作用。在此处输入图像描述

© www.soinside.com 2019 - 2024. All rights reserved.