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29.13. 如何在 POJO 模式中获取和设置 SOAP 标头

29.13. 如何在 POJO 模式中获取和设置 SOAP 标头

POJO 表示，当 camel-cxf 端点生成或使用 Camel 交换时，数据格式是 Java 对象列表。尽管 Camel 在此模式中将消息正文公开为 POJO，但 camel-cxf 仍然提供对读取和写入 SOAP 标头的访问。但是，由于 CXF 拦截器在处理后从标头列表中删除带外 SOAP 标头，因此只有带外 SOAP 标头可用于 POJO 模式 camel-cxf。

以下示例演示了如何获取/设置 SOAP 标头。假设我们有一个路由，它从一个 Camel-cxf 端点转发到另一个端点。也就是说，SOAP Client Camel CXF 服务。在请求进入 CXF 服务之前，我们可以附加两个处理器以在(1)获取/插入 SOAP 标头，然后再返回到 SOAP 客户端。本例中的 processor (1)和(2)是 InsertRequestOutHeaderProcessor 和 InsertResponseOutHeaderProcessor。我们的路由类似如下：

from("cxf:bean:routerRelayEndpointWithInsertion")
    .process(new InsertRequestOutHeaderProcessor())
    .to("cxf:bean:serviceRelayEndpointWithInsertion")
    .process(new InsertResponseOutHeaderProcessor());

from("cxf:bean:routerRelayEndpointWithInsertion")
    .process(new InsertRequestOutHeaderProcessor())
    .to("cxf:bean:serviceRelayEndpointWithInsertion")
    .process(new InsertResponseOutHeaderProcessor());

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Bean routerRelayEndpointWithInsertion 和 serviceRelayEndpointWithInsertion 定义如下：

@Bean
public CxfEndpoint routerRelayEndpointWithInsertion() {
    CxfSpringEndpoint cxfEndpoint = new CxfSpringEndpoint();
    cxfEndpoint.setServiceClass(org.apache.camel.component.cxf.soap.headers.HeaderTester.class);
    cxfEndpoint.setAddress("/CxfMessageHeadersRelayTest/HeaderService/routerRelayEndpointWithInsertion");
    cxfEndpoint.setWsdlURL("soap_header.wsdl");
    cxfEndpoint.setEndpointNameAsQName(
        QName.valueOf("{http://apache.org/camel/component/cxf/soap/headers}SoapPortRelayWithInsertion"));
    cxfEndpoint.setServiceNameAsQName(SERVICENAME);
    cxfEndpoint.getFeatures().add(new LoggingFeature());
    return cxfEndpoint;
}

@Bean
public CxfEndpoint serviceRelayEndpointWithInsertion() {
    CxfSpringEndpoint cxfEndpoint = new CxfSpringEndpoint();
    cxfEndpoint.setServiceClass(org.apache.camel.component.cxf.soap.headers.HeaderTester.class);
    cxfEndpoint.setAddress("http://localhost:" + port + "/services/CxfMessageHeadersRelayTest/HeaderService/routerRelayEndpointWithInsertionBackend");
    cxfEndpoint.setWsdlURL("soap_header.wsdl");
    cxfEndpoint.setEndpointNameAsQName(
        QName.valueOf("{http://apache.org/camel/component/cxf/soap/headers}SoapPortRelayWithInsertion"));
    cxfEndpoint.setServiceNameAsQName(SERVICENAME);
    cxfEndpoint.getFeatures().add(new LoggingFeature());
    return cxfEndpoint;
}

@Bean
public CxfEndpoint routerRelayEndpointWithInsertion() {
    CxfSpringEndpoint cxfEndpoint = new CxfSpringEndpoint();
    cxfEndpoint.setServiceClass(org.apache.camel.component.cxf.soap.headers.HeaderTester.class);
    cxfEndpoint.setAddress("/CxfMessageHeadersRelayTest/HeaderService/routerRelayEndpointWithInsertion");
    cxfEndpoint.setWsdlURL("soap_header.wsdl");
    cxfEndpoint.setEndpointNameAsQName(
        QName.valueOf("{http://apache.org/camel/component/cxf/soap/headers}SoapPortRelayWithInsertion"));
    cxfEndpoint.setServiceNameAsQName(SERVICENAME);
    cxfEndpoint.getFeatures().add(new LoggingFeature());
    return cxfEndpoint;
}

@Bean
public CxfEndpoint serviceRelayEndpointWithInsertion() {
    CxfSpringEndpoint cxfEndpoint = new CxfSpringEndpoint();
    cxfEndpoint.setServiceClass(org.apache.camel.component.cxf.soap.headers.HeaderTester.class);
    cxfEndpoint.setAddress("http://localhost:" + port + "/services/CxfMessageHeadersRelayTest/HeaderService/routerRelayEndpointWithInsertionBackend");
    cxfEndpoint.setWsdlURL("soap_header.wsdl");
    cxfEndpoint.setEndpointNameAsQName(
        QName.valueOf("{http://apache.org/camel/component/cxf/soap/headers}SoapPortRelayWithInsertion"));
    cxfEndpoint.setServiceNameAsQName(SERVICENAME);
    cxfEndpoint.getFeatures().add(new LoggingFeature());
    return cxfEndpoint;
}

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SOAP 标头被传播到 Camel 消息标头。Camel 消息标头名称是 "org.apache.cxf.headers.Header.list"，它是 CXF 中定义的常量(org.apache.cxf.headers.Header.Header.HEADER_LIST)。标头值是 CXF SoapHeader 对象列表(org.apache.cxf.binding.soap.SoapHeader)。以下片段是 InsertResponseOutHeaderProcessor （它会在响应消息中插入一个新的 SOAP 标头）。在 InsertResponseOutHeaderProcessor 和 InsertRequestOutHeaderProcessor 中访问 SOAP 标头的方式实际相同。两个处理器之间的唯一区别是设置插入 SOAP 标头的方向。

您可以在 CxfMessageHeadersRelayTest 中找到 InsertResponseOutHeaderProcessor 示例：

public static class InsertResponseOutHeaderProcessor implements Processor {

    public void process(Exchange exchange) throws Exception {
        List<SoapHeader> soapHeaders = CastUtils.cast((List<?>)exchange.getIn().getHeader(Header.HEADER_LIST));

        // Insert a new header
        String xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><outofbandHeader "
            + "xmlns=\"http://cxf.apache.org/outofband/Header\" hdrAttribute=\"testHdrAttribute\" "
            + "xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" soap:mustUnderstand=\"1\">"
            + "<name>New_testOobHeader</name><value>New_testOobHeaderValue</value></outofbandHeader>";
        SoapHeader newHeader = new SoapHeader(soapHeaders.get(0).getName(),
                       DOMUtils.readXml(new StringReader(xml)).getDocumentElement());
        // make sure direction is OUT since it is a response message.
        newHeader.setDirection(Direction.DIRECTION_OUT);
        //newHeader.setMustUnderstand(false);
        soapHeaders.add(newHeader);

    }

}

public static class InsertResponseOutHeaderProcessor implements Processor {

    public void process(Exchange exchange) throws Exception {
        List<SoapHeader> soapHeaders = CastUtils.cast((List<?>)exchange.getIn().getHeader(Header.HEADER_LIST));

        // Insert a new header
        String xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><outofbandHeader "
            + "xmlns=\"http://cxf.apache.org/outofband/Header\" hdrAttribute=\"testHdrAttribute\" "
            + "xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" soap:mustUnderstand=\"1\">"
            + "<name>New_testOobHeader</name><value>New_testOobHeaderValue</value></outofbandHeader>";
        SoapHeader newHeader = new SoapHeader(soapHeaders.get(0).getName(),
                       DOMUtils.readXml(new StringReader(xml)).getDocumentElement());
        // make sure direction is OUT since it is a response message.
        newHeader.setDirection(Direction.DIRECTION_OUT);
        //newHeader.setMustUnderstand(false);
        soapHeaders.add(newHeader);

    }

}

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29.13. 如何在 POJO 模式中获取和设置 SOAP 标头

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