記錄一下從零開始開發App支付寶H5支付的回撥函式的過程。 系統環境：64位Win10 JDK版本：1.8.0_181 思路：搭建Java環境，編寫簡單的Web專案，用Servlet實現介面功能。

1，下載安裝Eclipse 用eclipse_v4.7.0進行下載 連結：https://pan.baidu.com/s/1JHskgf7DkLi_XkEnyOuxxg 密碼：wcnc 選擇Eclipse IDE for Java EE Developers，因為只有這個裡面有Dynamic Web Project

3，建立Server和Web Project Eclipse中新建Dynamic Web Project專案TestSDK，在Project Explorer - TestSDK - Java Resources - src 下面新建Servlet，名叫TYBCallback。

/**
  * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//  response.getWriter().append("Served at: ").append(request.getContextPath());
//  System.out.println(request.getQueryString());
 


  try {
   File f = new File("");
   String absolutePath = f.getAbsolutePath();
   String fullPath = absolutePath + "\\TestSDK.txt";
   FileWriter fw = new FileWriter(fullPath,true);
   String param = request.getQueryString();
   SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//設定日期格式
 

   String content = df.format(new Date()) + "  " + param + "\r\n";
   fw.write(content);
            fw.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
  response.setCharacterEncoding("UTF-8");
  PrintWriter out = response.getWriter();
  out.print("success");
 }
 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }

只能用localhost不能用IP訪問時，將防火牆關掉