// 应用ID,您的APPID，收款账号既是您的APPID对应支付宝账号
public static final String APP_ID = Const.APP_ID;

// 商户私钥，您的PKCS8格式RSA2私钥
public static final String PRIVATE_KEY = Const.PRIVATE_KEY;

// 支付宝公钥,查看地址：https://openhome.alipay.com/platform/keyManage.htm 对应APPID下的支付宝公钥。
public static final String ALIPAY_PUBLIC_KEY = Const.ALIPAY_PUBLIC_KEY;

// 服务器异步通知页面路径  需http://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问
public static final String NOTIFY_URL = Const.ZHIAOADMINURL+"/alipayManager/notify.ajax";

// 页面跳转同步通知页面路径 需http://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问
public static final String RETURN_URL = Const.ZHIAOADMINURL+"alipayManager/return_url.do";

// 签名方式
public static final String SIGN_TYPE = "RSA2";

// 字符编码格式
public static final String CHARSET = "UTF-8";

// 支付宝网关
public static final String GATEWAY_URL = "https://openapi.alipay.com/gateway.do";

//参数返回格式，只支持json
private static final String FORMAT = "json";

//↑↑↑↑↑↑↑↑↑↑请在这里配置您的基本信息↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑

public static void aliPay(String outTradeNo, double totalAmount, String subject, HttpServletResponse response) throws IOException {
    //获得初始化的AlipayClient
    AlipayClient alipayClient = new DefaultAlipayClient(GATEWAY_URL, APP_ID, PRIVATE_KEY, FORMAT, CHARSET, ALIPAY_PUBLIC_KEY, SIGN_TYPE);
    AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();//创建API对应的request
    alipayRequest.setReturnUrl(RETURN_URL);
    alipayRequest.setNotifyUrl(NOTIFY_URL);//在公共参数中设置回跳和通知地址
    StringBuilder bizContent = new StringBuilder("{\"out_trade_no\":\"").append(outTradeNo).append("\",\"total_amount\":").append(totalAmount).
            append(",\"subject\":\"").append(subject).append(",\"timeout_express\":\"10m\",\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");
    alipayRequest.setBizContent(bizContent.toString());//填充业务参数
    System.out.println("请求报文为:----"+ JSON.toJSONString(alipayRequest));
    String form = "";
    try {
        form = alipayClient.pageExecute(alipayRequest).getBody(); //调用SDK生成表单
    } catch (AlipayApiException e) {
        e.printStackTrace();
    }
    response.setContentType("text/html;charset=" + CHARSET);
    PrintWriter out = response.getWriter();
    out.write(form);//直接将完整的表单html输出到页面
    out.flush();
    out.close();
}










    调用：
            String orderids= UUID.randomUUID().toString().replace("-", "");
    double totalAmount = 0.01;

    //调用支付宝
    String outTradeNo =orderids, subject = "测试标题";
    AlipayConfig.aliPay(outTradeNo, totalAmount, subject, response);

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