微信支付之扫码支付实例
Posted zengnansheng
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本例是采用微信扫码支付模式二
增加maven依赖
<dependency> <groupId>com.github.wxpay</groupId> <artifactId>wxpay-sdk</artifactId> <version>0.0.3</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.2.0</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.2.0</version> </dependency>
付款二维码
<img src="${pageContext.request.contextPath}/WxPay/getQRCode?orderId=1" />
WxPayController
package com.zns.controller; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.util.HashMap; import java.util.Hashtable; import java.util.Map; import java.util.UUID; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.log4j.Logger; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.github.wxpay.sdk.WXPayConstants.SignType; import com.github.wxpay.sdk.WXPayUtil; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.client.j2se.MatrixToImageWriter; import com.google.zxing.common.BitMatrix; @Controller @RequestMapping("/WxPay") public class WxPayController { protected final Logger logger = Logger.getLogger(WxPayController.class); // api密钥 在支付商户后台设置获取 protected String apiKey = ""; // 公众账号开发者appId protected String appId = ""; // 微信支付分配的商户号 protected String mchId = ""; // APP和网页支付提交用户端ip,Native支付填调用微信支付API的机器IP protected String requestIp = ""; // 统一下单url protected String unifiedorderUrl = "https://api.mch.weixin.qq.com/pay/unifiedorder"; // 异步接收微信支付结果通知的回调地址,通知url必须为外网可访问的url,不能携带参数。 protected String notifyUrl = "域名/WxPay/notifyUrl"; // 统一下单生成二维码 @RequestMapping("/getQRCode") public void getQRCode(HttpServletRequest request, HttpServletResponse response) throws Exception { Map<String, String> data = new HashMap<String, String>(); data.put("appid", appId); data.put("mch_id", mchId); // 随机字符串,长度要求在32位以内 data.put("nonce_str", UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32)); // 商品简单描述 data.put("body", "充值中心-开通会员"); // 商户系统内部订单号,要求32个字符内 data.put("out_trade_no", String.valueOf(System.currentTimeMillis())); data.put("fee_type", "CNY"); // 订单总金额,单位为分 data.put("total_fee", "1"); // APP和网页支付提交用户端ip,Native支付填调用微信支付API的机器IP data.put("spbill_create_ip", requestIp); // 异步接收微信支付结果通知的回调地址,通知url必须为外网可访问的url,不能携带参数。 data.put("notify_url", notifyUrl); // 取值如下:JSAPI,NATIVE,APP等 data.put("trade_type", "NATIVE"); // trade_type=NATIVE时(即扫码支付),此参数必传。此参数为二维码中包含的商品ID,商户自行定义。 data.put("product_id", "1"); String reqXmlStr = WXPayUtil.generateSignedXml(data, apiKey, SignType.MD5); try { HttpURLConnection conn = (HttpURLConnection) new URL(unifiedorderUrl).openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); BufferedOutputStream buffOutStr = new BufferedOutputStream(conn.getOutputStream()); buffOutStr.write(reqXmlStr.getBytes()); buffOutStr.flush(); buffOutStr.close(); // 获取输入流 BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line = null; StringBuffer sb = new StringBuffer(); while ((line = reader.readLine()) != null) { sb.append(line); } System.out.println("接口响应返回结果为:" + sb.toString()); // 接口返回的是xml格式字符串数据 转成map Map<String, String> resMap = WXPayUtil.xmlToMap(sb.toString()); String qrcodeUrl = ""; if (resMap.get("return_code").equals("SUCCESS") && resMap.get("result_code").equals("SUCCESS")) { qrcodeUrl = resMap.get("code_url"); } System.out.println("支付二维码url为:" + qrcodeUrl); // zxing 生成二维码 int width = 200; int height = 200; String format = "png"; Hashtable hints = new Hashtable(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); BitMatrix bitMatrix = new MultiFormatWriter().encode(qrcodeUrl, BarcodeFormat.QR_CODE, width, height, hints); OutputStream out = null; out = response.getOutputStream(); MatrixToImageWriter.writeToStream(bitMatrix, format, out); out.flush(); out.close(); } catch (Exception e) { e.printStackTrace(); } } // 支付结果异步通知回调 @RequestMapping("/notifyUrl") public void notifyUrl(HttpServletRequest request, HttpServletResponse response) throws Exception { // 读取参数 InputStream inputStream; StringBuffer sb = new StringBuffer(); inputStream = request.getInputStream(); String s; BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8")); while ((s = in.readLine()) != null) { sb.append(s); } in.close(); inputStream.close(); String receiveXml = sb.toString(); String resXml = ""; // 判断签名是否正确 if (!WXPayUtil.isSignatureValid(receiveXml, apiKey)) { resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[签名失败]]></return_msg>" + "</xml> "; } // 接收到的是xml格式字符串数据 转成map Map<String, String> receiveMap = WXPayUtil.xmlToMap(receiveXml); if (receiveMap.get("return_code").equals("SUCCESS")) { // 业务处理 省略。。。 // 通知微信.异步确认成功.必写.不然会一直通知后台.一定次数之后就认为交易失败了. resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>" + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> "; } else { resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[支付异常]]></return_msg>" + "</xml> "; } BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream()); out.write(resXml.getBytes()); out.flush(); out.close(); } }
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