Spring Boot微信扫码支付

前言

一、首先导入生成二维码和微信支付环境

com.google.zxing core 3.2.1 com.google.zxing javase 3.2.0 com.github.wxpay wxpay-sdk 0.0.3

二、在application.yml文件配置微信所有需的基本配置

1.导入

代码如下（示例）：

# 服务器域名地址 server: service-domain: //这里写你的域名地址 #微信app支付 pay: wxpay: app: appID: 微信appid mchID: 商户号 key: //这个key实在微信支付公众品台自己定义的key 要求36位 certPath: static/cert/wxpay/apiclient_cert.p12 # 从微信商户平台下载的安全证书存放的路径、我放在resources下面,切记一定要看看target目录下的class文件下有没有打包apiclient_cert.p12文件 payNotifyUrl: # 微信支付成功的异步通知接口 这里引入你的回调接口。 //这里直接写https://域名:端口/接口地址,注意一定是线上的接口，因为微信访问不到你本地的接口

2.创建MyWXPayConfig类引入配置信息

代码如下（示例）：

package com.example.gasstation.config; import lombok.Data; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component; import java.io.InputStream; @Data @Component @ConfigurationProperties(prefix = "pay.wxpay.app") public class MyWXPayConfig implements WXPayConfig{ /** * appID */ private String appID; /** * 商户号 */ private String mchID; /** * API 密钥 */ private String key; /** * API证书绝对路径 (本项目放在了 resources/cert/wxpay/apiclient_cert.p12") */ private String certPath; /** * HTTP(S) 连接超时时间，单位毫秒 */ private int httpConnectTimeoutMs = 8000; /** * HTTP(S) 读数据超时时间，单位毫秒 */ private int httpReadTimeoutMs = 10000; /** * 微信支付异步通知地址 */ private String payNotifyUrl; /** * 微信退款异步通知地址 */ private String refundNotifyUrl; /** * 统一下单url */ private final String UNIFIED_ORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder"; /** 这里实现了一个service层**/ @Override public InputStream getCertStream() { InputStream certStream =getClass().getClassLoader().getResourceAsStream(certPath); return certStream; } //在同层级下面新建WXPayConfig service层 package com.example.gasstation.config; import java.io.InputStream; public interface WXPayConfig { InputStream getCertStream();//不要问我为啥不另起一行，因为我懒 } }

三、引入 WxPayServiceImpl 实现类

package com.example.gasstation.server.impl; import com.example.gasstation.config.MyWXPayConfig; import com.example.gasstation.entity.Result; import com.example.gasstation.mapper.PayMapper; import com.example.gasstation.model.Money_transfer; import com.example.gasstation.model.Pay; import com.example.gasstation.server.WxPayService; import com.example.gasstation.util.HttpClientUtil; import com.example.gasstation.util.WXPayUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Map; import java.util.SortedMap; import java.util.TreeMap; @Service public class WxPayServiceImpl implements WxPayService { @Autowired private MyWXPayConfig wxPayAppConfig; @Autowired private PayMapper payMapper; @Override public String save(String orderNo, double amount, String body,Integer uid) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式 // 1. 生成订单 // 订单号，流水号，金额，付款状态，创建时间 String product_id = WXPayUtils.generateUUID(); Pay pay = new Pay();//这里新建一个实体类 用处存入数据库 pay.setTradeNo(product_id); pay.setOutTradeNo(orderNo); pay.setBody(body); pay.setPaystatus(1); pay.setUid(uid); pay.setTotalAmount(amount); pay.setGmtCreate(df.format(new Date())); pay.setTradeStatus("0"); pay.setAppId(wxPayAppConfig.getAppID()); // 生成预支付订单，保存到数据库 payMapper.insert(pay); // 调用统一下单方法，返回 codeUrl 地址 String codeUrl = unifiedOrder(product_id,orderNo,amount,body); return codeUrl; } private String unifiedOrder(String product_id, String orderNo, double amount, String body){ // 生成签名 try{ SortedMap params = new TreeMap<>(); params.put("appid",wxPayAppConfig.getAppID()); params.put("mch_id",wxPayAppConfig.getMchID()); params.put("nonce_str", WXPayUtils.generateUUID()); params.put("body",body); // 商品描述 params.put("out_trade_no",orderNo); // 商户订单号 params.put("total_fee",String.valueOf((int)(amount*100))); // 标价金额（单位为分） params.put("spbill_create_ip", "这里写服务器IP"); // 终端IP params.put("notify_url", wxPayAppConfig.getPayNotifyUrl()); // 异步接收微信支付结果通知的回调地址 params.put("trade_type","NATIVE"); // 交易类型 params.put("product_id",product_id); // 微信支付要求NATIVE支付，此参数必填 // sign 签名 String sign = WXPayUtils.createSign(params, wxPayAppConfig.getKey()); params.put("sign",sign); System.out.println(sign); // map转xml String payXml = WXPayUtils.mapToXml(params); System.out.println(payXml); // 统一下单 String s = HttpClientUtil.doPost(wxPayAppConfig.getUNIFIED_ORDER_URL(), payXml, 10000); if(null == s){ return null; } Map unifiedOrderMap = WXPayUtils.xmlToMap(s); System.out.println(unifiedOrderMap.toString()); if(unifiedOrderMap != null){ // 前台添加定时器，进行轮询操作，直到支付完毕 return unifiedOrderMap.get("code_url"); } } catch (Exception e){ e.printStackTrace(); } return null; } }

四、引入WxPayService层

package com.example.gasstation.server; import com.example.gasstation.model.Money_transfer; public interface WxPayService { String save(String orderNo, double amount, String body,Integer uid); boolean callBackPayUpdate(String outTradeNo,String totalFee); }

五、引入Util类

package com.example.gasstation.util; import com.github.wxpay.sdk.WXPayUtil; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.w3c.dom.Document; import org.w3c.dom.Element; import javax.xml.parsers.DocumentBuilder; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import java.io.ByteArrayInputStream; import java.io.InputStream; import java.io.StringWriter; import java.util.*; /** * @Author qjp */ public class WXPayUtils { /** * XML格式字符串转换为Map * * @param strXML XML字符串 * @return XML数据转换后的Map * @throws Exception */ public static Map xmlToMap(String strXML) throws Exception { try { Map data = new HashMap(); DocumentBuilder documentBuilder = WXPayXmlUtil.newDocumentBuilder(); InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8")); org.w3c.dom.Document doc = documentBuilder.parse(stream); doc.getDocumentElement().normalize(); NodeList nodeList = doc.getDocumentElement().getChildNodes(); for (int idx = 0; idx < nodeList.getLength(); ++idx) { Node node = nodeList.item(idx); if (node.getNodeType() == Node.ELEMENT_NODE) { org.w3c.dom.Element element = (org.w3c.dom.Element) node; data.put(element.getNodeName(), element.getTextContent()); } } try { stream.close(); } catch (Exception ex) { // do nothing } return data; } catch (Exception ex) { WXPayUtils.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML); throw ex; } } /** * 将Map转换为XML格式的字符串 * * @param data Map类型数据 * @return XML格式的字符串 * @throws Exception */ public static String mapToXml(Map data) throws Exception { Document document = WXPayXmlUtil.newDocument(); Element root = document.createElement("xml"); document.appendChild(root); for (String key: data.keySet()) { String value = data.get(key); if (value == null) { value = ""; } value = value.trim(); Element filed = document.createElement(key); filed.appendChild(document.createTextNode(value)); root.appendChild(filed); } TransformerFactory tf = TransformerFactory.newInstance(); Transformer transformer = tf.newTransformer(); DOMSource source = new DOMSource(document); transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); StringWriter writer = new StringWriter(); StreamResult result = new StreamResult(writer); transformer.transform(source, result); String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", ""); try { writer.close(); } catch (Exception ex) { } return output; } /** * 生成微信支付sign */ public static String createSign(SortedMap params, String key){ StringBuilder sb = new StringBuilder(); Set> es = params.entrySet(); Iterator> it = es.iterator(); while(it.hasNext()){ Map.Entry entry = it.next(); String k = entry.getKey(); String v = entry.getValue(); if(null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)){ sb.append(k + "=" + v + "&"); } } sb.append("key=").append(key); String sign = MD5Util.MD5(sb.toString()).toUpperCase(); return sign; } /** * 校验签名 * @param params * @param key * @return */ public static Boolean isCorrectSign(SortedMap params, String key){ String sign = createSign(params, key); String wxPaySign = params.get("sign").toUpperCase(); return wxPaySign.equals(sign); } /** * 获取有序map * @param map */ public static SortedMap getSortedMap(Map map){ SortedMap sortedMap = new TreeMap<>(); Iterator it = map.keySet().iterator(); while(it.hasNext()){ String key = it.next(); String value = map.get(key); String temp = ""; if(null != value){ temp = value.trim(); } sortedMap.put(key, value); } return sortedMap; } /** * 日志 * @return */ public static Logger getLogger() { Logger logger = LoggerFactory.getLogger("wxpay java sdk"); return logger; } /** * 获取当前时间戳，单位秒 * @return */ public static long getCurrentTimestamp() { return System.currentTimeMillis()/1000; } /** * 获取当前时间戳，单位毫秒 * @return */ public static long getCurrentTimestampMs() { return System.currentTimeMillis(); } /** * 生成UUID(用来表示一笔订单) * @return */ public static String generateUUID(){ String uuid = UUID.randomUUID().toString() .replaceAll("-","") .substring(0,32); return uuid; } }

引入WXPayXmlUtil类

package com.example.gasstation.util; import javax.xml.XMLConstants; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.Document; public final class WXPayXmlUtil { public static DocumentBuilder newDocumentBuilder() throws ParserConfigurationException { DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); documentBuilderFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true); documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false); documentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false); documentBuilderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false); documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true); documentBuilderFactory.setXIncludeAware(false); documentBuilderFactory.setExpandEntityReferences(false); return documentBuilderFactory.newDocumentBuilder(); } public static Document newDocument() throws ParserConfigurationException { return newDocumentBuilder().newDocument(); } }

六、引入WxPayController类

提示：到这里没有报错咱们已经成功一半啦

@RestController @RequestMapping("/wxPay") public class WxPayController { @Autowired private WxPayService wxPayService; @Autowired private MyWXPayConfig wxPayConfig; @Autowired private WebMvcConfigurer webMvcConfigurer; /** * 微信支付 生成二维码 * * @param money * @return */ @GetMapping("/pay") public void wxPay(Double money,String body,Integer uid ,HttpServletResponse response){ Double amount = money;//金额 SimpleDateFormat date = new SimpleDateFormat("yyyyMMddHHmmss"); String orderNo = date.format(new Date()) + WXPayUtils.getCurrentTimestampMs(); String url_code = wxPayService.save(orderNo, amount, body,uid); System.out.println("url_code:----------"+url_code); if(url_code == null){ throw new NullPointerException(); } try { // 生成二维码配置 Map hints = new HashMap<>(); // 设置纠错等级 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); // 编码类型 hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); BitMatrix bitMatrix = new MultiFormatWriter().encode(url_code, BarcodeFormat.QR_CODE, 400, 400, hints); OutputStream outputStream = response.getOutputStream(); MatrixToImageWriter.writeToStream(bitMatrix, "png", outputStream); } catch (Exception e){ e.printStackTrace(); } } /** * 微信支付回调接口 */ @RequestMapping("/callback") public void OrderCallBack(HttpServletRequest request, HttpServletResponse response) { InputStream inputStream = null; try { inputStream = request.getInputStream(); // BufferedReader是包装设计模式，性能更高 BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8")); StringBuffer stringBuffer = new StringBuffer(); String line; while ((line = bufferedReader.readLine()) != null) { stringBuffer.append(line); } bufferedReader.close(); inputStream.close(); Map callBackMap = WXPayUtils.xmlToMap(stringBuffer.toString()); System.out.println(callBackMap.toString()); SortedMap sortedMap = WXPayUtils.getSortedMap(callBackMap); // 校验签名是否正确 if (WXPayUtils.isCorrectSign(sortedMap, wxPayConfig.getKey())) { System.out.println("签名校验成功！"); // 更新订单状态 if ("SUCCESS".equals(sortedMap.get("result_code"))) { String outTradeNo = sortedMap.get("out_trade_no"); // 流水号 String totalFee = sortedMap.get("total_fee"); // 交易金额 if (wxPayService.callBackPayUpdate(outTradeNo, totalFee)) { // 通知微信订单处理成功 response.setContentType("text/xml"); response.setContentType("content-type"); response.getWriter().println(" "); //这里说明告诉微信你已经成功啦，别给老子重复回调我的方法啦，这里有一个坑， response.setContentType("text/xml"); response.getWriter().println("SUCCESS") //本身我就只有这两句话，然后就导致微信一直回调我的方法，废了半天的劲才搞好啦， //原因就是格式不对，给他返回的值他不认识，这里可以看一下微信的支付开发文档，虽然文档写的很垃圾 } } // 未成功，就都处理为失败订单 response.setContentType("text/html"); response.getWriter().println("fail"); } } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } }

七、MD5加密

@Slf4j public class MD5Util { public static String MD5(String source) { return encodeMd5(source.getBytes()); } private static String encodeMd5(byte[] source) { try { return encodeHex(MessageDigest.getInstance("MD5").digest(source)); } catch (NoSuchAlgorithmException e) { throw new IllegalStateException(e.getMessage(), e); } } private static String encodeHex(byte[] bytes) { StringBuffer buffer = new StringBuffer(bytes.length * 2); for (int i = 0; i < bytes.length; i++) { if(((int) bytes[i] & 0xff) < 0x10) { buffer.append("0"); } buffer.append(Long.toString((int) bytes[i] & 0xff, 16)); } return buffer.toString(); } }

总结

有什么不对的地方欢迎各位码友指出问题，因为我也是第一次做这个微信扫码支付

回调方法返回类型是void 你设置其他返回类型，就会跟你 给微信返的起冲突，就会导致报错

有知道怎么解决的，欢迎指导。

此文章如有冲突，请联系我下架。上传这个只为记录，不作为其他用处

程序员不怕踩坑，就拍没坑可踩，加油打工人！

前言

一、首先导入生成二维码和微信支付环境

com.google.zxing core 3.2.1 com.google.zxing javase 3.2.0 com.github.wxpay wxpay-sdk 0.0.3

二、在application.yml文件配置微信所有需的基本配置

1.导入

代码如下（示例）：

# 服务器域名地址 server: service-domain: //这里写你的域名地址 #微信app支付 pay: wxpay: app: appID: 微信appid mchID: 商户号 key: //这个key实在微信支付公众品台自己定义的key 要求36位 certPath: static/cert/wxpay/apiclient_cert.p12 # 从微信商户平台下载的安全证书存放的路径、我放在resources下面,切记一定要看看target目录下的class文件下有没有打包apiclient_cert.p12文件 payNotifyUrl: # 微信支付成功的异步通知接口 这里引入你的回调接口。 //这里直接写https://域名:端口/接口地址,注意一定是线上的接口，因为微信访问不到你本地的接口

2.创建MyWXPayConfig类引入配置信息

代码如下（示例）：

package com.example.gasstation.config; import lombok.Data; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component; import java.io.InputStream; @Data @Component @ConfigurationProperties(prefix = "pay.wxpay.app") public class MyWXPayConfig implements WXPayConfig{ /** * appID */ private String appID; /** * 商户号 */ private String mchID; /** * API 密钥 */ private String key; /** * API证书绝对路径 (本项目放在了 resources/cert/wxpay/apiclient_cert.p12") */ private String certPath; /** * HTTP(S) 连接超时时间，单位毫秒 */ private int httpConnectTimeoutMs = 8000; /** * HTTP(S) 读数据超时时间，单位毫秒 */ private int httpReadTimeoutMs = 10000; /** * 微信支付异步通知地址 */ private String payNotifyUrl; /** * 微信退款异步通知地址 */ private String refundNotifyUrl; /** * 统一下单url */ private final String UNIFIED_ORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder"; /** 这里实现了一个service层**/ @Override public InputStream getCertStream() { InputStream certStream =getClass().getClassLoader().getResourceAsStream(certPath); return certStream; } //在同层级下面新建WXPayConfig service层 package com.example.gasstation.config; import java.io.InputStream; public interface WXPayConfig { InputStream getCertStream();//不要问我为啥不另起一行，因为我懒 } }

三、引入 WxPayServiceImpl 实现类

package com.example.gasstation.server.impl; import com.example.gasstation.config.MyWXPayConfig; import com.example.gasstation.entity.Result; import com.example.gasstation.mapper.PayMapper; import com.example.gasstation.model.Money_transfer; import com.example.gasstation.model.Pay; import com.example.gasstation.server.WxPayService; import com.example.gasstation.util.HttpClientUtil; import com.example.gasstation.util.WXPayUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Map; import java.util.SortedMap; import java.util.TreeMap; @Service public class WxPayServiceImpl implements WxPayService { @Autowired private MyWXPayConfig wxPayAppConfig; @Autowired private PayMapper payMapper; @Override public String save(String orderNo, double amount, String body,Integer uid) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式 // 1. 生成订单 // 订单号，流水号，金额，付款状态，创建时间 String product_id = WXPayUtils.generateUUID(); Pay pay = new Pay();//这里新建一个实体类 用处存入数据库 pay.setTradeNo(product_id); pay.setOutTradeNo(orderNo); pay.setBody(body); pay.setPaystatus(1); pay.setUid(uid); pay.setTotalAmount(amount); pay.setGmtCreate(df.format(new Date())); pay.setTradeStatus("0"); pay.setAppId(wxPayAppConfig.getAppID()); // 生成预支付订单，保存到数据库 payMapper.insert(pay); // 调用统一下单方法，返回 codeUrl 地址 String codeUrl = unifiedOrder(product_id,orderNo,amount,body); return codeUrl; } private String unifiedOrder(String product_id, String orderNo, double amount, String body){ // 生成签名 try{ SortedMap params = new TreeMap<>(); params.put("appid",wxPayAppConfig.getAppID()); params.put("mch_id",wxPayAppConfig.getMchID()); params.put("nonce_str", WXPayUtils.generateUUID()); params.put("body",body); // 商品描述 params.put("out_trade_no",orderNo); // 商户订单号 params.put("total_fee",String.valueOf((int)(amount*100))); // 标价金额（单位为分） params.put("spbill_create_ip", "这里写服务器IP"); // 终端IP params.put("notify_url", wxPayAppConfig.getPayNotifyUrl()); // 异步接收微信支付结果通知的回调地址 params.put("trade_type","NATIVE"); // 交易类型 params.put("product_id",product_id); // 微信支付要求NATIVE支付，此参数必填 // sign 签名 String sign = WXPayUtils.createSign(params, wxPayAppConfig.getKey()); params.put("sign",sign); System.out.println(sign); // map转xml String payXml = WXPayUtils.mapToXml(params); System.out.println(payXml); // 统一下单 String s = HttpClientUtil.doPost(wxPayAppConfig.getUNIFIED_ORDER_URL(), payXml, 10000); if(null == s){ return null; } Map unifiedOrderMap = WXPayUtils.xmlToMap(s); System.out.println(unifiedOrderMap.toString()); if(unifiedOrderMap != null){ // 前台添加定时器，进行轮询操作，直到支付完毕 return unifiedOrderMap.get("code_url"); } } catch (Exception e){ e.printStackTrace(); } return null; } }

四、引入WxPayService层

package com.example.gasstation.server; import com.example.gasstation.model.Money_transfer; public interface WxPayService { String save(String orderNo, double amount, String body,Integer uid); boolean callBackPayUpdate(String outTradeNo,String totalFee); }

五、引入Util类

package com.example.gasstation.util; import com.github.wxpay.sdk.WXPayUtil; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.w3c.dom.Document; import org.w3c.dom.Element; import javax.xml.parsers.DocumentBuilder; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import java.io.ByteArrayInputStream; import java.io.InputStream; import java.io.StringWriter; import java.util.*; /** * @Author qjp */ public class WXPayUtils { /** * XML格式字符串转换为Map * * @param strXML XML字符串 * @return XML数据转换后的Map * @throws Exception */ public static Map xmlToMap(String strXML) throws Exception { try { Map data = new HashMap(); DocumentBuilder documentBuilder = WXPayXmlUtil.newDocumentBuilder(); InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8")); org.w3c.dom.Document doc = documentBuilder.parse(stream); doc.getDocumentElement().normalize(); NodeList nodeList = doc.getDocumentElement().getChildNodes(); for (int idx = 0; idx < nodeList.getLength(); ++idx) { Node node = nodeList.item(idx); if (node.getNodeType() == Node.ELEMENT_NODE) { org.w3c.dom.Element element = (org.w3c.dom.Element) node; data.put(element.getNodeName(), element.getTextContent()); } } try { stream.close(); } catch (Exception ex) { // do nothing } return data; } catch (Exception ex) { WXPayUtils.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML); throw ex; } } /** * 将Map转换为XML格式的字符串 * * @param data Map类型数据 * @return XML格式的字符串 * @throws Exception */ public static String mapToXml(Map data) throws Exception { Document document = WXPayXmlUtil.newDocument(); Element root = document.createElement("xml"); document.appendChild(root); for (String key: data.keySet()) { String value = data.get(key); if (value == null) { value = ""; } value = value.trim(); Element filed = document.createElement(key); filed.appendChild(document.createTextNode(value)); root.appendChild(filed); } TransformerFactory tf = TransformerFactory.newInstance(); Transformer transformer = tf.newTransformer(); DOMSource source = new DOMSource(document); transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); StringWriter writer = new StringWriter(); StreamResult result = new StreamResult(writer); transformer.transform(source, result); String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", ""); try { writer.close(); } catch (Exception ex) { } return output; } /** * 生成微信支付sign */ public static String createSign(SortedMap params, String key){ StringBuilder sb = new StringBuilder(); Set> es = params.entrySet(); Iterator> it = es.iterator(); while(it.hasNext()){ Map.Entry entry = it.next(); String k = entry.getKey(); String v = entry.getValue(); if(null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)){ sb.append(k + "=" + v + "&"); } } sb.append("key=").append(key); String sign = MD5Util.MD5(sb.toString()).toUpperCase(); return sign; } /** * 校验签名 * @param params * @param key * @return */ public static Boolean isCorrectSign(SortedMap params, String key){ String sign = createSign(params, key); String wxPaySign = params.get("sign").toUpperCase(); return wxPaySign.equals(sign); } /** * 获取有序map * @param map */ public static SortedMap getSortedMap(Map map){ SortedMap sortedMap = new TreeMap<>(); Iterator it = map.keySet().iterator(); while(it.hasNext()){ String key = it.next(); String value = map.get(key); String temp = ""; if(null != value){ temp = value.trim(); } sortedMap.put(key, value); } return sortedMap; } /** * 日志 * @return */ public static Logger getLogger() { Logger logger = LoggerFactory.getLogger("wxpay java sdk"); return logger; } /** * 获取当前时间戳，单位秒 * @return */ public static long getCurrentTimestamp() { return System.currentTimeMillis()/1000; } /** * 获取当前时间戳，单位毫秒 * @return */ public static long getCurrentTimestampMs() { return System.currentTimeMillis(); } /** * 生成UUID(用来表示一笔订单) * @return */ public static String generateUUID(){ String uuid = UUID.randomUUID().toString() .replaceAll("-","") .substring(0,32); return uuid; } }

引入WXPayXmlUtil类

package com.example.gasstation.util; import javax.xml.XMLConstants; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.Document; public final class WXPayXmlUtil { public static DocumentBuilder newDocumentBuilder() throws ParserConfigurationException { DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); documentBuilderFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true); documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false); documentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false); documentBuilderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false); documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true); documentBuilderFactory.setXIncludeAware(false); documentBuilderFactory.setExpandEntityReferences(false); return documentBuilderFactory.newDocumentBuilder(); } public static Document newDocument() throws ParserConfigurationException { return newDocumentBuilder().newDocument(); } }

六、引入WxPayController类

提示：到这里没有报错咱们已经成功一半啦

@RestController @RequestMapping("/wxPay") public class WxPayController { @Autowired private WxPayService wxPayService; @Autowired private MyWXPayConfig wxPayConfig; @Autowired private WebMvcConfigurer webMvcConfigurer; /** * 微信支付 生成二维码 * * @param money * @return */ @GetMapping("/pay") public void wxPay(Double money,String body,Integer uid ,HttpServletResponse response){ Double amount = money;//金额 SimpleDateFormat date = new SimpleDateFormat("yyyyMMddHHmmss"); String orderNo = date.format(new Date()) + WXPayUtils.getCurrentTimestampMs(); String url_code = wxPayService.save(orderNo, amount, body,uid); System.out.println("url_code:----------"+url_code); if(url_code == null){ throw new NullPointerException(); } try { // 生成二维码配置 Map hints = new HashMap<>(); // 设置纠错等级 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); // 编码类型 hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); BitMatrix bitMatrix = new MultiFormatWriter().encode(url_code, BarcodeFormat.QR_CODE, 400, 400, hints); OutputStream outputStream = response.getOutputStream(); MatrixToImageWriter.writeToStream(bitMatrix, "png", outputStream); } catch (Exception e){ e.printStackTrace(); } } /** * 微信支付回调接口 */ @RequestMapping("/callback") public void OrderCallBack(HttpServletRequest request, HttpServletResponse response) { InputStream inputStream = null; try { inputStream = request.getInputStream(); // BufferedReader是包装设计模式，性能更高 BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8")); StringBuffer stringBuffer = new StringBuffer(); String line; while ((line = bufferedReader.readLine()) != null) { stringBuffer.append(line); } bufferedReader.close(); inputStream.close(); Map callBackMap = WXPayUtils.xmlToMap(stringBuffer.toString()); System.out.println(callBackMap.toString()); SortedMap sortedMap = WXPayUtils.getSortedMap(callBackMap); // 校验签名是否正确 if (WXPayUtils.isCorrectSign(sortedMap, wxPayConfig.getKey())) { System.out.println("签名校验成功！"); // 更新订单状态 if ("SUCCESS".equals(sortedMap.get("result_code"))) { String outTradeNo = sortedMap.get("out_trade_no"); // 流水号 String totalFee = sortedMap.get("total_fee"); // 交易金额 if (wxPayService.callBackPayUpdate(outTradeNo, totalFee)) { // 通知微信订单处理成功 response.setContentType("text/xml"); response.setContentType("content-type"); response.getWriter().println(" "); //这里说明告诉微信你已经成功啦，别给老子重复回调我的方法啦，这里有一个坑， response.setContentType("text/xml"); response.getWriter().println("SUCCESS") //本身我就只有这两句话，然后就导致微信一直回调我的方法，废了半天的劲才搞好啦， //原因就是格式不对，给他返回的值他不认识，这里可以看一下微信的支付开发文档，虽然文档写的很垃圾 } } // 未成功，就都处理为失败订单 response.setContentType("text/html"); response.getWriter().println("fail"); } } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } }

七、MD5加密

@Slf4j public class MD5Util { public static String MD5(String source) { return encodeMd5(source.getBytes()); } private static String encodeMd5(byte[] source) { try { return encodeHex(MessageDigest.getInstance("MD5").digest(source)); } catch (NoSuchAlgorithmException e) { throw new IllegalStateException(e.getMessage(), e); } } private static String encodeHex(byte[] bytes) { StringBuffer buffer = new StringBuffer(bytes.length * 2); for (int i = 0; i < bytes.length; i++) { if(((int) bytes[i] & 0xff) < 0x10) { buffer.append("0"); } buffer.append(Long.toString((int) bytes[i] & 0xff, 16)); } return buffer.toString(); } }

总结

有什么不对的地方欢迎各位码友指出问题，因为我也是第一次做这个微信扫码支付

回调方法返回类型是void 你设置其他返回类型，就会跟你 给微信返的起冲突，就会导致报错

有知道怎么解决的，欢迎指导。

此文章如有冲突，请联系我下架。上传这个只为记录，不作为其他用处

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