SpringBoot微信扫码支付的实现示例

<!-- 生成二维码工具 --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.2.1</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.2.0</version> </dependency> <!-- 微信支付所需sdk --> <dependency> <groupId>com.github.wxpay</groupId> <artifactId>wxpay-sdk</artifactId> <version>0.0.3</version> </dependency>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;@Servicepublic 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<String, String> 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<String, String> 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<String, String> xmlToMap(String strXML) throws Exception { try { Map<String, String> data = new HashMap<String, String>(); 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<String, String> 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<String, String> params, String key){ StringBuilder sb = new StringBuilder(); Set<Map.Entry<String, String>> es = params.entrySet(); Iterator<Map.Entry<String, String>> it = es.iterator(); while(it.hasNext()){ Map.Entry<String, String> 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<String, String> 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<String, String> getSortedMap(Map<String, String> map){ SortedMap<String, String> sortedMap = new TreeMap<>(); Iterator<String> 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<EncodeHintType, Object> 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<String, String> callBackMap = WXPayUtils.xmlToMap(stringBuffer.toString()); System.out.println(callBackMap.toString()); SortedMap<String, String> 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('<xml> <return_code><![CDATA[SUCCESS]]></return_code> <return_msg><![CDATA[OK]]></return_msg> </xml>'); //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

@Slf4jpublic 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

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