java 在线支付接口 java调用支付接口

JAVA调用支付宝的直充接口原理和银联接口一样，当商家和支付宝签好协议后就可以问支付宝的人要相关的代码了。
我本地用的是支付宝UTF-8编码的代码，先把util里的东西达成一个alipay.jar文件。然后编写我们自己的调用和响应代码：

1.封装支付宝需要的接口数据

@Description("会员中心资金帐户支付宝充值")
 @CreatedInfo(creator = "hamano", date = "2008-09-22")
 public ModelAndView fundsDepositByAliPay(HttpServletRequest request,
   HttpServletResponse response) {
  RemindPageUtil remindPageUtil = new RemindPageUtil();
  Map<String, Object> paraMap = new HashMap<String, Object>();
  
  String paygateway = "https://www.alipay.com/cooperate/gateway.do?"; // '支付接口
  String service = "create_direct_pay_by_user";// 快速付款交易服务
  String sign_type = "MD5";
  String out_trade_no = SnGenerator.generateUnionPaySn(); // 商户网站订单
  String input_charset = "utf-8";
  String key = ""; // 支付宝安全校验码(账户内提取)
  String partner= ""; // 支付宝合作伙伴id (账户内提取)
  String body = "商品描述"; // 商品描述，推荐格式：商品名称（订单编号：订单编号）
  String total_fee ="0.01";// 订单总价
  String payment_type = "1";// 支付宝类型.1代表商品购买
  String seller_email = "[e-mail]"; // 卖家支付宝帐户
  String subject = "商品名称"; // 商品名称
  String show_url = "http://www/foolpid.net/product/show_product.jsp";//商品显示页
  String notify_url = "http://www/foolpid.net/accountController.do?method=alipayNotify"; // 通知接收URL
  String return_url = "http://www/foolpid.net/accountController.do?method=alipayReturn"; // 支付完成后跳转返回的网址URL
  String ItemUrl = Payment.CreateUrl(paygateway, service, sign_type,
    out_trade_no, input_charset, partner, key, show_url, body,
    total_fee, payment_type, seller_email, subject, notify_url,
    return_url);
//支付宝接口用POST传输，所以我自己写了个将GET转为POST的方法，代码在下面的程序中给出
  HttpClient http=new HttpClient(response);
  http.setParameter("body",body);
  http.setParameter("notify_url",notify_url);
  http.setParameter("out_trade_no",out_trade_no);
  http.setParameter("partner",partner);
  http.setParameter("payment_type",payment_type);
  http.setParameter("return_url",return_url);
  http.setParameter("seller_email",seller_email);
  http.setParameter("service",service);
  http.setParameter("show_url",show_url);
  http.setParameter("sign",ItemUrl);
  http.setParameter("sign_type",sign_type);
  http.setParameter("subject",subject);
  http.setParameter("total_fee",total_fee);
  try {
   http.sendByPost("https://www.alipay.com/cooperate/gateway.do?_input_charset=utf-8");
  } catch (IOException e) {
}
  return null;
 }

2.根据notify_url的设置响应支付宝接口

public ModelAndView alipayNotify(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  RemindPageUtil remindPageUtil = new RemindPageUtil();
  Map<String, Object> paraMap = new HashMap<String, Object>();
  String privateKey = ""; // 支付宝安全校验码(账户内提取)
  String partner= ""; // 支付宝合作伙伴id (账户内提取)  String alipayNotifyURL = "http://notify.alipay.com/trade/notify_query.do?"
    + "&partner="
    + partner
    + "¬ify_id="
    + request.getParameter("notify_id");  // 获取支付宝ATN返回结果，true是正确的订单信息，false 是无效的
  String responseTxt = CheckURL.check(alipayNotifyURL);  Map params = new HashMap();
  // 获得POST 过来参数设置到新的params中
  Map requestParams = request.getParameterMap();
  for (Iterator iter = requestParams.keySet().iterator(); iter.hasNext();) {
   String name = (String) iter.next();
   String[] values = (String[]) requestParams.get(name);
   String valueStr = "";
   for (int i = 0; i < values.length; i++) {
    valueStr = (i == values.length - 1) ? valueStr + values[i]
      : valueStr + values[i] + ",";
   }
   params.put(name, valueStr);
  }
  String mysign = com.alipay.util.SignatureHelper.sign(params, privateKey);
  String orderId=request.getParameter("out_trade_no");
  String amount=request.getParameter("total_fee");
  if (mysign.equals(request.getParameter("sign"))
    &&responseTxt.equals("true")) {
   if("TRADE_FINISHED".equals(request.getParameter("trade_status"))){
    return null;
   }else{
System.out.println("支付失败");   
}
   } else {
   System.out.println("支付失败");   
   }
  return null;
 }

3.return_url的调用和前面一致，用于支付完成后的返回页面

附注：将GET转为POST的类public class HttpClient {
 Map<String, String> parameter=new HashMap<String, String>();
 HttpServletResponse response; public HttpClient(HttpServletResponse response)
 {
    this.response=response;
 }
 public void setParameter(String key,String value)
 {
    this.parameter.put(key, value);
 }
 public void sendByPost(String url) throws IOException
 {
    this.response.setContentType("text/html");
    response.setCharacterEncoding("utf-8");
    PrintWriter out = this.response.getWriter();
    out.println("<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.01 Transitional//EN/">");
    out.println("<HTML>");
    out.println(" <HEAD><TITLE>sender</TITLE></HEAD>");
    out.println(" <BODY>");
    out.println("<form name=/"submitForm/" action=/""+url+"/" method=/"post/">");
      Iterator<String> it=this.parameter.keySet().iterator();
    while(it.hasNext())
    {
     String key=it.next();
     out.println("<input type=/"hidden/" name=/""+key+"/" value=/""+this.parameter.get(key)+"/"/>");
    }
    out.println("</from>");
    out.println("<script>window.document.submitForm.submit();</script> ");
    out.println(" </BODY>");
    out.println("</HTML>");
    out.flush();
    out.close(); }
}

我 在做程序的时候碰到了一个很怪的现象，在if (mysign.equals(request.getParameter("sign"))&&responseTxt.equals("true")) {}这一句，用jsp页面的时候没有任何问题，但写在类的方法中就会出现mysign和sign不一致的情况，在网上也查过相关资料有的说是编码问题，但 我打印出回调的参数时中文数据都是对的。后来问了支付宝的工作人员，说是key和partner没写，可我写的都对的。最后他们也没给我一个合理的答案， 他们说&&用||代替好了，因为最关键的是下面 if("TRADE_FINISHED".equals(request.getParameter("trade_status"))){}这里的判 断。
所以最后我就改成了if (mysign.equals(request.getParameter("sign"))||responseTxt.equals("true")) {}，如