如何使用 SAAJ 在 Java 中实现 SOAP 客户端？

工作 SOAP 客户端示例

使用 SAAJ 框架可以简化在 Java 中实现 SOAP 客户端。这个多功能框架使开发人员能够直接处理 SOAP 请求和响应消息，超越了 JAX-WS 的功能。

为了说明 SAAJ 的功能，请考虑以下 Web 服务调用：

import javax.xml.soap.*;

public class SOAPClientSAAJ {

    public static void main(String[] args) {
        String soapEndpointUrl = "http://www.webservicex.net/uszip.asmx";
        String soapAction = "http://www.webserviceX.NET/GetInfoByCity";

        callSoapWebService(soapEndpointUrl, soapAction);
    }

    private static void createSoapEnvelope(SOAPMessage soapMessage) throws SOAPException {
        SOAPPart soapPart = soapMessage.getSOAPPart();
        String myNamespace = "myNamespace";
        String myNamespaceURI = "http://www.webserviceX.NET";

        SOAPEnvelope envelope = soapPart.getEnvelope();
        envelope.addNamespaceDeclaration(myNamespace, myNamespaceURI);

        SOAPBody soapBody = envelope.getBody();
        SOAPElement soapBodyElem = soapBody.addChildElement("GetInfoByCity", myNamespace);
        SOAPElement soapBodyElem1 = soapBodyElem.addChildElement("USCity", myNamespace);
        soapBodyElem1.addTextNode("New York");
    }

    private static void callSoapWebService(String soapEndpointUrl, String soapAction) {
        try {
            SOAPConnectionFactory soapConnectionFactory = SOAPConnectionFactory.newInstance();
            SOAPConnection soapConnection = soapConnectionFactory.createConnection();

            SOAPMessage soapResponse = soapConnection.call(createSOAPRequest(soapAction), soapEndpointUrl);
            soapResponse.writeTo(System.out);
            System.out.println();

            soapConnection.close();
        } catch (Exception e) {
            System.err.println("Error sending SOAP Request. Ensure correct endpoint URL and SOAPAction.");
            e.printStackTrace();
        }
    }

    private static SOAPMessage createSOAPRequest(String soapAction) throws Exception {
        MessageFactory messageFactory = MessageFactory.newInstance();
        SOAPMessage soapMessage = messageFactory.createMessage();

        createSoapEnvelope(soapMessage);
        MimeHeaders headers = soapMessage.getMimeHeaders();
        headers.addHeader("SOAPAction", soapAction);
        soapMessage.saveChanges();

        soapMessage.writeTo(System.out);
        System.out.println();

        return soapMessage;
    }

}

这个综合示例演示了使用 SAAJ 的 SOAP Web 服务调用。修改参数以满足您特定的 Web 服务要求，并记住更改 createSoapEnvelope() 方法的内容以自定义 SOAP 信封的内容。

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