java实现支付宝二维码支付(Spring Boot)

 本文章主要介绍H5使用的支付宝二维码是如果通过java生成的，方便大家更好的对接。
 首先集成alipay的sdk,然后要到支付宝商户平台创建应用，生成私钥 公钥，
 话不多说直接上代码块

@ApiOperation(value = "支付宝生成二维码", httpMethod = "POST", response = ResultJsonBean.class, notes = "")
@RequestMapping(value = "/alipayQrcode",  method = {RequestMethod.POST,RequestMethod.GET})
@ResponseBody
@ParentPCUser
public void  alipayQrcode(
        @ApiParam(value="token")@RequestParam(required = false) String token,
        @ApiParam(value="支付金额",required = true)@RequestParam(required = true) Long totalprice,
        @ApiParam(value="支付订单号",required = true)@RequestParam(required = true) String orderNo,
        HttpServletRequest requests,HttpServletResponse responses) throws AlipayApiException {
    //获得初始化的AlipayClient
    AlipayClient alipayClient = new DefaultAlipayClient(OrderInfoUtil.requestUrl, OrderInfoUtil.APP_ID, OrderInfoUtil.APP_PRIVATE_KEY, "json", AlipayUtil.charset, OrderInfoUtil.ALIPAY_PUBLIC_KEY, AlipayUtil.sign_type);
    AlipayTradePrecreateRequest request = new AlipayTradePrecreateRequest();//创建API对应的request类

    Map<String,Object> map=new HashMap<>();
    //设置回调地址
    request.setNotifyUrl(AlipayUtil.NOTIFY_URL);
    //根据订单号查询订单信息
    Map<String,Object> maps=new HashMap<>();
    maps.put("out_trade_no",orderNo);
    maps.put("total_amount",totalprice+"");
    maps.put("subject","科谊达微课");
    maps.put("store_id","NJ_001");
    maps.put("timeout_express","90m");
    //把订单信息转换为json对象的字符串
    String postdata = JSONObject.fromObject(maps).toString();
    request.setBizContent(postdata);
    AlipayTradePrecreateResponse response = alipayClient.execute(request);
    String body = response.getBody();
    JSONObject jsonObject = JSONObject.fromObject(body);
    String qr_code = jsonObject.getJSONObject("alipay_trade_precreate_response").getString("qr_code");
    //流输出
    ServletOutputStream sos = null;
    try {
        sos = responses.getOutputStream();
        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
        // 指定编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        // 指定纠错级别(L--7%,M--15%,Q--25%,H--30%)
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 编码内容,编码类型(这里指定为二维码),生成图片宽度,生成图片高度,设置参数
        BitMatrix bitMatrix = new MultiFormatWriter().encode(qr_code, BarcodeFormat.QR_CODE, 200, 200, hints);
        //生成二维码
        MatrixToImageWriter.writeToStream(bitMatrix, "png", sos);
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}
 

这里要强调的是APP_PRIVATE_KEY是应用私钥，而ALIPAY_PUBLIC_KEY是支付宝公钥，sign_type用RSA还是RSA2取决你在商户平台使用的哪一种，否则会报签名错误，二维码返回其实是有两种方式一种是我写的这种，自己生产一个适用于任何地方的二维码，生成二维码代码

package com.kyd.util.pay;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import com.google.zxing.common.BitMatrix;
public class MatrixToImageWriter {

    private static final int BLACK = 0xFF000000;

    private static final int WHITE = 0xFFFFFFFF;

    private MatrixToImageWriter() {
    }

    public static BufferedImage toBufferedImage(BitMatrix matrix) {

        int width = matrix.getWidth();

        int height = matrix.getHeight();

        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }

    public static void writeToFile(BitMatrix matrix, String format, File file)

            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format "
                    + format + " to " + file);
        }
    }

    public static void writeToStream(BitMatrix matrix, String format,
                                     OutputStream stream)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format "
                    + format);
        }
    }
}

还有一种是生成form表单的形式

    @ApiOperation(value = "支付宝生成二维码", httpMethod = "POST", response = ResultJsonBean.class, notes = "")
    @RequestMapping(value = "/alipayQrcode",  method = {RequestMethod.POST,RequestMethod.GET})
    @ResponseBody
    @ParentPCUser
    public String alipayQrcode(
            @ApiParam(value="token")@RequestParam(required = false) String token,
            @ApiParam(value="支付金额",required = true)@RequestParam(required = true) Long totalprice,
            @ApiParam(value="支付订单号",required = true)@RequestParam(required = true) String orderNo,
            HttpServletRequest request,HttpServletResponse response){
        //获得初始化的AlipayClient
        AlipayClient alipayClient = new DefaultAlipayClient(AlipayUtil.gatewayUrl, OrderInfoUtil.APP_ID, OrderInfoUtil.APP_PRIVATE_KEY, "json", AlipayUtil.charset, OrderInfoUtil.ALIPAY_PUBLIC_KEY, AlipayUtil.sign_type);
        //创建PC场景下单并支付请求对象
        AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();//创建API对应的request
        //设置同步返回地址，HTTP/HTTPS开头字符串
        alipayRequest.setReturnUrl(AlipayUtil.RETURN_URL);
        //支付宝服务器主动通知商户服务器里指定的页面http/https路径。
        alipayRequest.setNotifyUrl(AlipayUtil.NOTIFY_URL);//在公共参数中设置回跳和通知地址
        Map<String,String> requestMap = new HashMap<>();
        requestMap.put("out_trade_no",orderNo);//订单编号
        requestMap.put("product_code","FAST_INSTANT_TRADE_PAY");//产品交易码
        requestMap.put("total_amount",totalprice+"");//实际付款金额
        requestMap.put("subject","微课");//商品名称
        //填充业务参数
        alipayRequest.setBizContent(JSON.toJSONString(requestMap));
        String form="";
        try {
            //调用SDK生成表单
            form = alipayClient.pageExecute(alipayRequest).getBody();
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        return form;
    }
}

这种方式是跳转到支付宝的公共扫码页面做支付