java如何调用.net发布 的WebService

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;

namespace AspWebService1
{
    /// <summary>
    /// Service1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://erplab.sjtu.edu/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
    // [System.Web.Script.Services.ScriptService]
    public class Service1 : System.Web.Services.WebService
    {

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

        [WebMethod]
        public string sayHelloToPersonNew(String name)
        {
            if (name == null)
            {
                name = "nobody";
            }
            return "hello," + name;
        }

        [WebMethod]
        public double count(double number, double price, double discount)
        {
            return number * price * discount;
        }

        
        [WebMethod]
        public float getFloat(float x)
        {
            return x;
        }

        //加法
        [WebMethod]
        public float plus(float x, float y)
        {
            return x + y;
        }

        //减法
        [WebMethod]
        public float minus(float x, float y)
        {
            return x - y;
        }

        //乘法
        [WebMethod]
        public float multiply(float x, float y)
        {
            return x * y;
        }

        //除法
        [WebMethod]
        public float divide(float x, float y)
        {
            if (y != 0)
            {
                return x / y;
            }
            else
                return -1;
        }

    }
}