Spring 集成 - 无法使用 Http 入站网关处理 multipart/form-data

Question

这是一个 Spring 集成（基于 Spring 启动）项目，我已经配置 Spring 集成应用程序如下，

配置xml：


<int:channel id="httpChannel"/>

 <int-http:inbound-gateway  supported-methods="GET,POST" request-channel="httpChannel" reply-channel="outputChannel" path="/"
  message-converters="converter" 
 /> 
 <bean id="converter" class="in.tc.springintegrationdemo.CustomConverter" />
    
    
  <int:transformer ref="customTransformer" input-channel="httpChannel" output-channel="outputChannel" />  

  <bean id="customTransformer" class="in.tc.springintegrationdemo.MultipartTransformer" />  
  
   <bean class="in.tc.springintegrationdemo.MessageUpdateBean" id="printMessage"/> 
<int:service-activator ref="printMessage" method="print"  input-channel="outputChannel">
</int:service-activator>

CustomConverter 定义如下


public class CustomConverter implements HttpMessageConverter<MultiValueMap<String,?>> {

    @Override
    public boolean canRead(Class<?> clazz, MediaType mediaType) {
      ...
    }

    @Override
    public boolean canWrite(Class<?> clazz, MediaType mediaType) {
        return false;
    }

    @Override
    public List<MediaType> getSupportedMediaTypes() {
        return Collections.singletonList(MediaType.MULTIPART_FORM_DATA);
    }

    @Override
    public MultiValueMap<String,?> read(Class<? extends MultiValueMap<String,?>> clazz, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {
         MultiValueMap<String, ?> result = new LinkedMultiValueMap<>();
         String str = "";
        MediaType contentType = inputMessage.getHeaders().getContentType();
                BufferedReader bufferedReader = new BufferedReader(
                        new InputStreamReader(inputMessage.getBody(), contentType.getCharset()));
                while((str=bufferedReader.readLine())!=null) {
                
                    //code to retrieve multipart data
                }
        return result;
    }

    @Override
    public void write(MultiValueMap<String,?> t, MediaType contentType, HttpOutputMessage outputMessage)
            throws IOException, HttpMessageNotWritableException {
        throw new UnsupportedOperationException();
    }

对于 multipart/form-data，我总是在 CustomConverter class 中收到空白负载。

我也试过如下添加 multipartResolver

<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> but it has the same result.

我在 Whosebug 上关注了一个类似的问题。但对我来说它不起作用。

Multipart/form-data 有效负载

POST / HTTP/1.1
User-Agent: PostmanRuntime/7.26.8
Accept: */*
Postman-Token: d24d89ef-c52b-492a-96b9-6ef6807e8d1a
Host: localhost:9090
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Content-Type: multipart/form-data; boundary=--------------------------865732735860935509694157
Content-Length: 217

----------------------------865732735860935509694157
Content-Disposition: form-data; name=""; filename="testfile.txt"
Content-Type: text/plain

testcontent
----------------------------865732735860935509694157--

感谢期待。

Answer 1

我认为你需要放弃你的 CustomConverter 以支持现有的开箱即用 - MultipartAwareFormHttpMessageConverter，它实际上在任何 <int-http:inbound-gateway> bean 中默认显示定义。

既然你说你使用 Spring 引导，那么你不需要对 multipartResolver 做任何事情 - 它是自动配置的，开箱即用MultipartAutoConfiguration.

如果这对您仍然不起作用，我很乐意查看您的项目的一个简单的简短版本，以供使用、重现和可能的修复。

不相关：是否有机会理解为什么使用 XML 配置，而不是 Java & 注释甚至 Java DSL？

Spring 集成 - 无法使用 Http 入站网关处理 multipart/form-data

Spring Integration - Unable to process multipart/form-data with Http-inbound Gateway

spring

spring-integration

spring-boot