Spring MVC 使用支付宝接口完成在线支付的示例代码

 <dependency>
      <groupId>com.alipay</groupId>
      <artifactId>alipay</artifactId>
      <version>1.1.1</version>
      <scope>system</scope>
      <!--本地jar的路径,相对或者绝对都可以-->
      <systemPath>${project.basedir}/lib/alipay-sdk-java20170307171631.jar</systemPath>
    </dependency>
    <dependency>
      <groupId>com.alipay1</groupId>
      <artifactId>commons</artifactId>
      <version>1.1.1</version>
      <scope>system</scope>
      <!--本地jar的路径,相对或者绝对都可以-->
      <systemPath>${project.basedir}/lib/commons-logging-1.1.1.jar</systemPath>
    </dependency>

//转到支付页面
    //初始化客户端 只需要实例化一次（线程安全）
    AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipaydev.com/gateway.do"
        , "2016080300153333", GlobalConstant.APP_PRIVATE_KEY, "json", "UTF-8", GlobalConstant.ALIPAY_PUBLIC_KEY, "RSA2");
    AlipayTradeWapPayRequest alipayRequest = new AlipayTradeWapPayRequest();//创建API对应的request
    //在公共参数中设置回跳和通知地址
    alipayRequest.setReturnUrl("回跳地址");
    //异步回调一定是要在外网 不然支付宝服务器无法访问
    alipayRequest.setNotifyUrl("异步回调地址");
    alipayRequest.setBizContent("{" +
        "  \"out_trade_no\":\"" + orderId + "\"," +
        "  \"total_amount\":\"" + fetchParcel.getMoney() + "\"," +
        "  \"subject\":\"代领快递\"," +
        "  \"seller_id\":\"2088102169684935\"," +
        "  \"product_code\":\"QUICK_WAP_PAY\"" +
        " }");//填充业务参数
    String form = alipayClient.pageExecute(alipayRequest).getBody(); //调用SDK生成表单
    httpResponse.setContentType("text/html;charset=utf-8");
    httpResponse.getWriter().write(form);//直接将完整的表单html输出到页面
    httpResponse.getWriter().flush();

  //将异步通知中收到的所有参数都存放到map中
    Map<String, String> paramsMap =new HashMap<>();
    paramsMap.put("tarde_no",trade_no);
    paramsMap.put("trade_status",trade_status);
    paramsMap.put("total_amount",total_amount);
    paramsMap.put("out_trade_no",out_trade_no);
    boolean signVerified = AlipaySignature.rsaCheckV1(paramsMap, GlobalConstant.ALIPAY_PUBLIC_KEY, "UTF-8", "RSA2");     //调用SDK验证签名
    if (signVerified) {
      //验签成功后，按照支付结果异步通知中的描述，对支付结果中的业务内容进行二次校验，校验成功后在response中返回success并继续商户自身业务处理，校验失败返回failure
      String out_trade_no1 = paramsMap.get("out_trade_no");
      String trade_status1 = paramsMap.get("trade_status");
      logger.info(out_trade_no1+":"+trade_status1);
      return "success";
    } else {
      //验签失败则记录异常日志，并在response中返回failure.
      return "failure";
    }