Android 中利用 ksoap2 调用 WebService的示例代码

当我们需要在Android应用中调用网络服务时，可以通过使用Web Service来实现。在Android中使用ksoap2库可以简单地实现Web Service调用。下面是使用ksoap2库在Android中调用WebService的步骤示例。

步骤一：导入ksoap2库文件

将ksoap2的jar文件拷贝到Android项目的libs目录下，并在build.gradle中添加以下代码

dependencies {
    implementation files('libs/ksoap2-android-assembly-3.6.2-jar-with-dependencies.jar')
}

步骤二：创建android异步任务

由于网络请求是不允许在主线程中进行的，所以我们需要创建Android异步任务来处理。

private class MyAsyncTask extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            String result = "";
            String url = "http://webServiceUrl";//Web Service请求URL
            String namespace = "http://webServiceNamespace";//Web Service的命名空间
            String methodName = "webServiceMethodName";//Web Service的方法名

            try{
                SoapObject soapObject = new SoapObject(namespace, methodName);//创建SoapObject对象
                soapObject.addProperty("arg1", "paramValue1");//添加参数
                soapObject.addProperty("arg2", "paramValue2");
                SoapSerializationEnvelope soapSerializationEnvelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);//创建SoapSerializationEnvelope对象
                soapSerializationEnvelope.bodyOut = soapObject;//设置参数
                soapSerializationEnvelope.dotNet = true;
                HttpTransportSE httpTransportSE = new HttpTransportSE(url);//创建HttpTransportSE对象
                httpTransportSE.debug = true;
                try{
                    httpTransportSE.call(null, soapSerializationEnvelope);//调用Web Service方法
                    if (soapSerializationEnvelope.getResponse() != null){
                        result = soapSerializationEnvelope.getResponse().toString();//获取返回结果
                    }
                }catch (Exception e){
                    e.printStackTrace();
                }
            }catch (Exception e){
                e.printStackTrace();
            }

            return result;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //处理请求结果
        }
    }

步骤三：执行异步任务

执行异步任务的方式很简单，只需要调用MyAsyncTask的execute方法即可：

new MyAsyncTask().execute();

示例1：调用返回结构体的Web Service方法

要调用返回结构体的Web Service方法，需要创建一个SoapObject来存储传递的参数。

private void callWebService(){
    AsyncTask<String, Void, String> task = new AsyncTask<String, Void, String>() {
        @Override
        protected String doInBackground(String... params) {
            String url = "http://www.webservicex.net/globalweather.asmx?WSDL";
            String namespace="http://www.webserviceX.NET";
            String methodName="GetCitiesByCountry";
            String soapAction="http://www.webserviceX.NET/GetCitiesByCountry";

            String result = "";
            try{
                SoapObject soapObject = new SoapObject(namespace, methodName);

                soapObject.addProperty("CountryName", "China");

                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                envelope.bodyOut = soapObject;
                envelope.dotNet = true;

                HttpTransportSE httpTransportSE = new HttpTransportSE(url);
                httpTransportSE.call(soapAction, envelope);
                Object object = envelope.getResponse();

                if (object != null) {
                    result = object.toString();
                }

            }catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            Log.d(TAG, "Result:"+result);
            //处理请求结果
        }
    };
    task.execute();
}

示例2：调用返回数组结构体的Web Service方法

要调用返回数组结构体的Web Service方法，需要创建一个SoapObject来存储传递的参数。

private void callWebService2(){
    AsyncTask<String, Void, String> task = new AsyncTask<String, Void, String>() {
        @Override
        protected String doInBackground(String... params) {
            String url = "http://www.wsdemo.com/WeatherWebService.asmx?WSDL";
            String namespace="http://www.WSDemo.com";
            String methodName="getWeatherInfoByCity";
            String soapAction="http://www.WSDemo.com/getWeatherInfoByCity";

            String result = "";
            try{
                SoapObject soapObject = new SoapObject(namespace, methodName);

                soapObject.addProperty("theCityName", "上海");

                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                envelope.bodyOut = soapObject;
                envelope.dotNet = true;

                HttpTransportSE httpTransportSE = new HttpTransportSE(url);
                httpTransportSE.call(soapAction, envelope);
                Vector vector = (Vector)envelope.getResponse();

                if (vector != null && vector.size()>0) {
                    for(int i = 0; i < vector.size(); i++){
                        Object object = vector.get(i);
                        if (object instanceof SoapObject){
                            SoapObject soapObject1 = (SoapObject)object;
                            //处理返回的数据
                        }
                    }
                }
            }catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            Log.d(TAG, "Result:"+result);
            //处理请求结果
        }
    };
    task.execute();
}

以上就是在Android中利用ksoap2调用WebService的示例代码详细攻略。