Reactive Spring WebClient - 进行 SOAP 调用

Question

我希望从 spring 反应式 webclient 进行 SOAP 调用。 我找不到它的任何文档。 想知道有什么方法。 现在我在想

1. 在单独的线程池上使用 JAXB 构造 SOAP 消息
2. 通过 webclient 将其转换为字符串来进行调用
3. 在返回单独的 tp 的路上使用 jaxb 转换回 java。

有什么缺点和任何其他方法？

Answer 1

您需要生成 SOAP 客户端作为具有异步方法的存根类。 JAX-WS API 支持异步调用。 使用wsiimport和enableAsyncMapping生成方法operationAsync(Input request, AsyncHandler asyncHandler);

AsyncHandler 使用 Mono.create() 创建

Service service = new Service();
ServicePortType portType = service.getPortType();

public Mono<Output> operation(Input input) {
            return Mono.create(sink ->
               portType.operation(input, outputFuture -> {
                   try {
                       sink.success(outputFuture.get());
                   } catch (Exception e) {
                       sink.error(e);
                   }
               })
            );
        }

你会反应性地得到 Mono

我在https://blog.godatadriven.com/jaxws-reactive-client帖子中找到了建议

Answer 2

这是 Spring Reactor 的一个工作示例： https : //github.com/gungor/spring-webclient-soap

您需要将生成的 JAXB 类包含在带有自定义编码器的 soap 信封中，如下所示，然后将其添加到 WebClient 的交换策略中。

package webclient.soap.encoding;

import org.reactivestreams.Publisher;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.CodecException;
import org.springframework.core.codec.Encoder;
import org.springframework.core.codec.EncodingException;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.core.io.buffer.PooledDataBuffer;
import org.springframework.util.ClassUtils;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
import org.springframework.ws.WebServiceMessage;
import org.springframework.ws.WebServiceMessageFactory;
import org.springframework.ws.client.core.WebServiceTemplate;
import org.springframework.ws.support.DefaultStrategiesHelper;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.MarshalException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

public class Jaxb2SoapEncoder implements Encoder<Object> {

    private final JaxbContextContainer jaxbContexts = new JaxbContextContainer();

    @Override
    public boolean canEncode(ResolvableType elementType, MimeType mimeType) {
        Class<?> outputClass = elementType.toClass();
        return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
                    outputClass.isAnnotationPresent(XmlType.class));

    }

    @Override
    public Flux<DataBuffer> encode(Publisher<?> inputStream, DataBufferFactory bufferFactory, ResolvableType elementType, MimeType mimeType, Map<String, Object> hints) {
        return Flux.from(inputStream)
                .take(1)
                .concatMap(value -> encode(value, bufferFactory, elementType, mimeType, hints))
                .doOnDiscard(PooledDataBuffer.class, PooledDataBuffer::release);
    }

    @Override
    public List<MimeType> getEncodableMimeTypes() {
        return Arrays.asList( MimeTypeUtils.TEXT_XML );
    }



    private Flux<DataBuffer> encode(Object value ,
                                    DataBufferFactory bufferFactory,
                                    ResolvableType type,
                                    MimeType mimeType,
                                    Map<String, Object> hints){

        return Mono.fromCallable(() -> {
            boolean release = true;
            DataBuffer buffer = bufferFactory.allocateBuffer(1024);
            try {
                OutputStream outputStream = buffer.asOutputStream();
                Class<?> clazz = ClassUtils.getUserClass(value);
                Marshaller marshaller = initMarshaller(clazz);

                // here should be optimized
                DefaultStrategiesHelper helper = new DefaultStrategiesHelper(WebServiceTemplate.class);
                WebServiceMessageFactory messageFactory = helper.getDefaultStrategy(WebServiceMessageFactory.class);
                WebServiceMessage message = messageFactory.createWebServiceMessage();

                marshaller.marshal(value, message.getPayloadResult());
                message.writeTo(outputStream);

                release = false;
                return buffer;
            }
            catch (MarshalException ex) {
                throw new EncodingException(
                        "Could not marshal " + value.getClass() + " to XML", ex);
            }
            catch (JAXBException ex) {
                throw new CodecException("Invalid JAXB configuration", ex);
            }
            finally {
                if (release) {
                    DataBufferUtils.release(buffer);
                }
            }
        }).flux();
    }


    private Marshaller initMarshaller(Class<?> clazz) throws JAXBException {
        Marshaller marshaller = this.jaxbContexts.createMarshaller(clazz);
        marshaller.setProperty(Marshaller.JAXB_ENCODING, StandardCharsets.UTF_8.name());
        return marshaller;
    }
}

网络客户端配置

@Bean
    public WebClient webClient(){
        TcpClient tcpClient = TcpClient.create();

        tcpClient
                .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 5000)
                .doOnConnected(connection -> {
                    connection.addHandlerLast(new ReadTimeoutHandler(5000, TimeUnit.MILLISECONDS));
                    connection.addHandlerLast(new WriteTimeoutHandler(5000, TimeUnit.MILLISECONDS));
                });

        ExchangeStrategies exchangeStrategies = ExchangeStrategies.builder().codecs( clientCodecConfigurer -> {
            clientCodecConfigurer.customCodecs().encoder(new Jaxb2SoapEncoder());
        }).build();

        WebClient webClient = WebClient.builder()
                .clientConnector(new ReactorClientHttpConnector(HttpClient.from(tcpClient).wiretap(true)))
                .exchangeStrategies( exchangeStrategies )
                .build();

        return webClient;
    }

网络客户端

public void call(GetCountryRequest getCountryRequest) throws SOAPException, ParserConfigurationException, IOException {

        webClient.post()
                .uri( soapServiceUrl )
                .contentType(MediaType.TEXT_XML)
                .body( Mono.just(getCountryRequest) , GetCountryRequest.class  )
                .retrieve()
                .onStatus(
                        HttpStatus::isError,
                        clientResponse ->
                                clientResponse
                                        .bodyToMono(String.class)
                                        .flatMap(
                                                errorResponseBody ->
                                                        Mono.error(
                                                                new ResponseStatusException(
                                                                        clientResponse.statusCode(),
                                                                        errorResponseBody))))

                .bodyToMono(GetCountryResponse.class)
                .doOnSuccess( (GetCountryResponse response) -> {
                    //handle success
                })
                .doOnError(ResponseStatusException.class, error -> {
                    //handle error
                })
                .subscribe();

    }