[WebMethod]
public string HelloWorld(string str)
{
  return "Hello World";
}

import org.apache.axis.client.Call;
import org.apache.axis.client.Service;
import org.apache.axis.encoding.XMLType;
import javax.xml.namespace.QName;
import javax.xml.rpc.ParameterMode;
 
public class HelloWorldClient {
 public static void main(String[] argv) {
   String endpoint ="http://localhost:64662/WebService1.asmx?wsdl";
   try {
     // 定义服务
     Service service = new Service();
     Call call = (Call) service.createCall();
     call.setTargetEndpointAddress(endpoint);
     call.setOperationName(new QName("http://tempuri.org/", "HelloWorld"));
     call.setSOAPActionURI("http://tempuri.org/HelloWorld");
     call.addParameter(new QName("http://tempuri.org/", "str"),// 这里的str对应webservice参数名称
         XMLType.SOAP_STRING, ParameterMode.IN);
     call.setReturnType(XMLType.SOAP_STRING);
     String retVal1 = (String) call.invoke(new Object[] {"Hello World!"});
     System.out.println(retVal1);
   } catch (Exception e) {
     e.printStackTrace();
   }
 }
}