我试图访​​问Android的一个 Web服务通过 Ksoap2 为Android。

I'm trying to access a webservice in Android via Ksoap2 for Android.

在 SoapObject 创建确定，对SOP的 bodyOut 输出所需的字符串。但是，当我做了 requestDump 的 HttpTransportSE 对象创建拨打电话，一 NullPointerException异常发生。换句话说，传输对象为空。怎么能这样呢？

The SoapObject is created OK, the S.O.P of the bodyOut outputs the desired strings. But when I do a requestDump of the HttpTransportSE object I create to make the call, a NullPointerException happens. In other words, the transport object is null. How can this happen?

Web服务是 http://srilanka.lk:9080/services/CropServiceProxy?wsdl

此服务可以非常好地了SoapUI。

了SoapUI请求：

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:v1="http://schemas.icta.lk/xsd/crop/handler/v1/">
   <soap:Header/>
   <soap:Body>
      <v1:getCropDataList>
         <v1:code>ABK</v1:code>
      </v1:getCropDataList>
   </soap:Body>
</soap:Envelope>

了SoapUI响应：

<soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope">
   <soapenv:Body>
      <ns1:getCropDataListResponse xmlns:ns1="http://schemas.icta.lk/xsd/crop/handler/v1/">
         <ns1:cropInfo>
            <ns1:name>Ambul Kesel</ns1:name>
            <ns1:price>35.0</ns1:price>
            <ns1:location>Dambulla</ns1:location>
         </ns1:cropInfo>
         <ns1:cropInfo>
            <ns1:name>Ambul Kesel</ns1:name>
            <ns1:price>40.0</ns1:price>
            <ns1:location>Dambulla</ns1:location>
         </ns1:cropInfo>
      </ns1:getCropDataListResponse>
   </soapenv:Body>
</soapenv:Envelope>

客户端复合类型 KvmSerializable 实施：

Client Side Complex Type KvmSerializable implementation:

public class CropInfo implements KvmSerializable {

 private String name;
 private float price;
 private String location;

 @Override
 public Object getProperty(int arg0) {
  switch (arg0){
  case 0:
   return name;
  case 1:
   return price;
  case 2:
   return location;
  default:
    return null;
  }
 }

 @Override
 public int getPropertyCount() {
  return 3;
 }

 @Override
 public void getPropertyInfo(int arg0, Hashtable arg1, PropertyInfo arg2) {
  switch (arg0){
  case 0:
   arg2.type = PropertyInfo.STRING_CLASS;
   arg2.name = "Name";
   break;
  case 1:
   arg2.type = Float.class;
   arg2.name = "Price";
   break;
  case 2:
   arg2.type = PropertyInfo.STRING_CLASS;
   arg2.name = "Location";
   break;
  default:
    break;
  }

 }

 @Override
 public void setProperty(int arg0, Object arg1) {
  switch(arg0){
  case 0:
   name = arg1.toString();
   break;
  case 1:
   price = Float.parseFloat(arg1.toString());
  case 2:
   location = arg1.toString();
  default:
   break;
  }
 }
}

Web Service调用：

public void btnOnClick(View v){
     String NAMESPACE = "http://schemas.icta.lk/xsd/crop/handler/v1/";
  String URL = "http://220.247.225.202:9080/services/CropServiceProxy.CropServiceProxyHttpSoap12Endpoint";

  String method_name = "getCropDataList";
  String SOAP_ACTION = "http://schemas.icta.lk/xsd/crop/handler/v1/getCropDataList";

  SoapObject soap_request = new SoapObject(NAMESPACE, method_name);
  soap_request.addProperty("code", "ABK" );

  SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12);
  envelope.setOutputSoapObject(soap_request);
  envelope.addMapping(NAMESPACE, "cropInfo", CropInfo.class);
  //envelope.dotNet=true;

  Marshal floatMarshal = new MarshalFloat();
  floatMarshal.register(envelope);

  System.out.println("body out : " + envelope.bodyOut.toString());

  //AndroidHttpTransport http_transport = new AndroidHttpTransport(URL);
  HttpTransportSE http_transport  = new HttpTransportSE(URL);
  try {
                    //NullPointerException HERE
   System.out.println(http_transport.requestDump);
   http_transport.call(SOAP_ACTION, envelope);

   //because we should expect a vector, two kinds of prices are given
   Vector<CropInfo> result_array = (Vector<CropInfo>)envelope.getResponse();
   if(result_array != null){
    for (CropInfo current_crop: result_array){
     System.out.println(current_crop.getName());
     System.out.println(Float.toString(current_crop.getPrice()));
    }
   }

  } catch (Exception e) {
   e.printStackTrace();
   answer.setText("error caught");
   //System.out.println(http_transport.responseDump);
  }

  // String result_string[] = (String[])result;

  //answer.setText("returned");

    }

谁能解释一下吗？

Can anyone explain this?

推荐答案

您需要设置debug在传输实例字段设置为真，然后调用通话（字符串的SoapEnvelope）为了让 requestDump 字段的方法进行设置：

You need to set the debug field of the Transport instance to true, then call the call(String,SoapEnvelope) method in order for the requestDump field to be set:

  HttpTransportSE http_transport = new HttpTransportSE(URL);
  http_transport.debug = true;
  try {
   http_transport.call(SOAP_ACTION, envelope);
   System.out.println(http_transport.requestDump);
  //...