JAVA与.NET平台间RSA签名验签及SHA-1加密HTTP通信实现

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Configuration;
using System.Text.RegularExpressions;
using System.Security.Cryptography;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public string a;
        public Form1()
        {
            InitializeComponent();
        }

        private void post_Click_1(object sender, EventArgs e)
        {
            //编码格式
            Encoding encode = Encoding.GetEncoding("utf-8");
            string strurl = "http://localhost:37395/Default.aspx";
            // string strurl = "/PayPlatform/api/BatchPayAPI";

            //实例化 WebRequest 
            HttpWebRequest myreq = (HttpWebRequest)WebRequest.Create(strurl);

            //Method:post
            myreq.Method = "POST";

            //Content-Type，内容类型，一般是指网页中存在的Content-Type，用于定义网络文件的类型和网页的编码
            myreq.ContentType = "application/x-www-form-urlencoded";
            //var postData = "fileContent=eJx7v3u/mZGhmZGZoQEcGFroPG1d8WzHgpeNk3VA4jpPG+a/WLfhae/C93t6nu7c/HRd58vJ214s7OHlMjMyMjQ1tbAwNDI2AenVebJr0ovGKc/3TtQxMTXQebFlO0QjXpWGCHUA5N1Bbw== &fileName=测试&merNum=305501560129200&orderId=201508120949 &signature=bMImBfUUft29Q7vhbWDF2ZgPmaOGMo3mG1Ntu3dxo4Kbld5yjpCaKD3XU3AGaCgJLcNwXm6JTGqvX6MVi7jdshXdXA42oKfPM8/U/QUwvPQJjq1ani72raISDsGQFoie+yHUnT+0RLzshGnYCdhSSdCCh7bUyANQKXt2isSuPZ8=&totalAmt=1451&totalQty=3&txTime=20150812094945";
            var postData = txt2.Text;
            //string postData = ""; getBytes（）是将一个字符串转化为一个字节数组。
            byte[] requestArray2 = encode.GetBytes(postData);
            //字节流的长度，即当前页面的大小
            myreq.ContentLength = requestArray2.Length;

            //提供字节序列的一般视图。
            Stream newStream = myreq.GetRequestStream();
            newStream.Write(requestArray2, 0, requestArray2.Length);
            newStream.Close();

            //返回服务器值段
            HttpWebResponse myresp = (HttpWebResponse)myreq.GetResponse();
            StreamReader reader = new StreamReader(myresp.GetResponseStream(), encode);
            //string textsum=HtmlFilter(reader.ReadToEnd());
            // string []tt=textsum.Split('<');
            // txt3.Text = textsum.Substring(0,);
            txt3.Text = reader.ReadToEnd();
            string[] sArray = txt3.Text.Split('&');
            string sback = sArray[0] + "&" + sArray[1] + "&" + sArray[2] + "&" + sArray[3] + "&" + sArray[5] + "&";
            Encoding encode2 = Encoding.GetEncoding("utf-8");