Reactive Spring WebClient - 進行 SOAP 調用

Question

我希望從 spring 反應式 webclient 進行 SOAP 調用。 我找不到它的任何文檔。 想知道有什么方法。 現在我在想

1. 在單獨的線程池上使用 JAXB 構造 SOAP 消息
2. 通過 webclient 將其轉換為字符串來進行調用
3. 在返回單獨的 tp 的路上使用 jaxb 轉換回 java。

有什么缺點和任何其他方法？

Answer 1

您需要生成 SOAP 客戶端作為具有異步方法的存根類。 JAX-WS API 支持異步調用。 使用wsiimport和enableAsyncMapping生成方法operationAsync(Input request, AsyncHandler asyncHandler);

AsyncHandler 使用 Mono.create() 創建

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);
                   }
               })
            );
        }

你會反應性地得到 Mono

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

Answer 2

這是 Spring Reactor 的一個工作示例： https : //github.com/gungor/spring-webclient-soap

您需要將生成的 JAXB 類包含在帶有自定義編碼器的 soap 信封中，如下所示，然后將其添加到 WebClient 的交換策略中。

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;
    }
}

網絡客戶端配置

@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;
    }

網絡客戶端

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();

    }