java - SoapFault - 故障代码 : 'soap:Server' faultstring: 'Server was unable to process request. 未将对象引用设置为对象的实例

Question

我有一个用 asp.net 编程的网络服务。我想使用 SOAP(ksoap2) 从 Android 应用程序访问 Web 服务。

这是我的 SOAP fragment ，

//Namespace of the Webservice - can be found in WSDL
private static String NAMESPACE = "http://tempuri.org/";
//Webservice URL - WSDL File location
private static String URL = "http://locationbasedapp.net/Service1.asmx";//Make sure you changed IP address
//SOAP Action URI again Namespace + Web method name
private static String SOAP_ACTION = "http://tempuri.org/";

public static String invokeListLocationsWS(String datetext, String webMethName) {
    String xmlDataSet = "";
    // Create request
    SoapObject request = new SoapObject(NAMESPACE, webMethName);
    // Property which holds input parameters
    PropertyInfo datetextPI = new PropertyInfo();
    PropertyInfo passPI = new PropertyInfo();
    // Set Username
    datetextPI.setName("datetext");
    // Set Value
    datetextPI.setValue(datetext);
    // Set dataType
    datetextPI.setType(String.class);
    // Add the property to request object
    request.addProperty(datetextPI);

    // Create envelope
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
            SoapEnvelope.VER11);
    envelope.dotNet = true;
    // Set output SOAP object
    envelope.setOutputSoapObject(request);
    // Create HTTP call object
    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

    try {
        // Invoke web service
        androidHttpTransport.call(SOAP_ACTION+webMethName, envelope);
        // Get the response
        SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
        // Assign it to  boolean variable variable

        xmlDataSet =response.toString();

    } catch (Exception e) {
        //Assign Error Status true in static variable 'errored'
        MapActivity.errored = true;
        e.printStackTrace();
    }
    //Return booleam to calling object
    return xmlDataSet;
}

当我调试代码时，出现问题标题中提到的错误。错误出现在

SoapPrimitive response = (SoapPrimitive)envelope.getResponse();

线..

我想我无法从网络服务获得响应。我该如何修复它？

Web 服务返回 xml.InnerText。它的类型是字符串。

请回答我。

Answer 1

虽然我不是 .NET 开发人员，但在使用 Java 之前我见过类似的错误代码它总是归结为 XML被调用 web service 返回无效。

就我而言，我 try catch 原始 XML响应，然后尝试使用 XML 解析它解析库。