微信统一下单

微信扫码支付流程图：https://pay.weixin.qq.com/wiki/doc/api/native_sl.php?chapter=6_5&index=4

微信公众号支付流程图：https://pay.weixin.qq.com/wiki/doc/api/jsapi_sl.php?chapter=7_4

微信扫码支付，微信公众号支付官方文档：https://pay.weixin.qq.com/wiki/doc/api/native_sl.php?chapter=9_1

微信官方demosdk：https://pay.weixin.qq.com/wiki/doc/api/jsapi_sl.php?chapter=11_1

微信扫码支付，那段代码可以直接使用。

微信公众号支付，需要前端配合。需要配置微信jsconfig。

微信jsapi配置官方文档：https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421141115

直接上代码

/** * * 微信支付 * */ public class WXPayService { // 统一下单URL private static String unifiedorder_url = "https://api.mch.weixin.qq.com/pay/unifiedorder"; /** * 统一下单,公众号支付 * * @param body 内容 * @param out_trade_no 订单号 * @param total_fee 价格 * @param spbill_create_ip 用户的IP地址 * @param notify_url 支付完成后通知路径 * @param openid // 用户的openId * * @throws Exception */ public Map<String, String> unifiedOrder(String body, String out_trade_no, String total_fee, String spbill_create_ip, String notify_url, String openid) throws Exception { // 请求参数 Map<String, String> param = new HashMap<String, String>(); param.put("appid", WXConstant.APPID); // 公众账号ID param.put("mch_id", WXConstant.MCH_ID); // 商户号 param.put("nonce_str", WXPayUtil.generateNonceStr()); // param.put("body", body); // 内容(随意填,具体参照微信官方文档) param.put("out_trade_no", out_trade_no); // 订单号 param.put("total_fee", total_fee); // 支付价格.<注意：这里的价格单位是分,必须是整数,不能带小数点的> param.put("spbill_create_ip", spbill_create_ip); // IP地址 ַ param.put("notify_url", notify_url); // 通知路径 param.put("trade_type", "JSAPI"); // JSAPI-微信公众号支付 param.put("openid", openid); // 用户的openId // 生成带有 sign 的 XML 格式字符串 String xmlparam = WXPayUtil.generateSignedXml(param, WXConstant.KEY); // 发送请求 String resultStr = SendHttpRequest.sendPostRequest(unifiedorder_url, xmlparam); // 转成MAP Map<String, String> wxResultMap = WXPayUtil.xmlToMap(resultStr); // 是否统一下单成功 if (wxResultMap.get("return_code").equals("SUCCESS") && wxResultMap.get("result_code").equals("SUCCESS")) { // 时间戳 String timeStamp = new Long(WXPayUtil.getCurrentTimestamp()).toString(); // 创建返回值 Map<String, String> resultMap = new HashMap<String, String>(); resultMap.put("appId", wxResultMap.get("appid")); resultMap.put("timeStamp", timeStamp); resultMap.put("nonceStr", wxResultMap.get("nonce_str")); resultMap.put("package", "prepay_id=" + wxResultMap.get("prepay_id")); resultMap.put("signType", "MD5"); // 生成签名 String paySign = WXPayUtil.generateSignature(resultMap, WXConstant.KEY); resultMap.put("paySign", paySign); return resultMap; } else { throw new Exception("错误结果Map = " + wxResultMap.toString()); } } /** * 统一下单,扫码支付 * * @param body 内容 * @param out_trade_no 订单号 * @param total_fee 价格 * @param spbill_create_ip 用户的IP地址 * @param notify_url 支付完成后通知路径 * * @throws Exception */ public Map<String, String> unifiedOrder(String body, String out_trade_no, String total_fee, String spbill_create_ip, String notify_url) throws Exception { // 请求参数 Map<String, String> param = new HashMap<String, String>(); param.put("appid", WXConstant.APPID); // 公众账号ID param.put("mch_id", WXConstant.MCH_ID); // 商户号 param.put("nonce_str", WXPayUtil.generateNonceStr()); // param.put("body", body); // 内容(随意填,具体参照微信官方文档) param.put("out_trade_no", out_trade_no); // 订单号 param.put("total_fee", total_fee); // 支付价格.<注意：这里的价格单位是分,必须是整数,不能带小数点的> param.put("spbill_create_ip", spbill_create_ip); // IP地址 ַ param.put("notify_url", notify_url); // 通知路径 param.put("trade_type", "NATIVE"); // JSAPI-微信公众号支付 // 生成带有 sign 的 XML 格式字符串 String xmlparam = WXPayUtil.generateSignedXml(param, WXConstant.KEY); // 发送请求 String resultStr = SendHttpRequest.sendPostRequest(unifiedorder_url, xmlparam); // 转成MAP Map<String, String> wxResultMap = WXPayUtil.xmlToMap(resultStr); // 返回 return wxResultMap; } }发送请求工具类

import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.URL; import java.net.URLConnection; /** * 发送http请求 * */ public class SendHttpRequest { /** * 发送GET请求 * * @param url 请求地址 * @param param 请求参数(格式:key1=value1&key2=value2&key3=value3) * @return * @throws Exception */ public static String sendGetRequest(String url, String param) throws Exception { String result = ""; BufferedReader in = null; try { // 拼接URL和参数 String urlAndParam = url + "?" + param; // 创建URL对象 URL realUrl = new URL(urlAndParam); // 打开URL的链接 URLConnection conn = realUrl.openConnection(); // 设置Head信息 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); // 建立链接 conn.connect(); // 定义 BufferedReader输入流来读取URL的响应 in = new BufferedReader(new InputStreamReader(conn.getInputStream())); // 临时参数 String line; // 获取响应结果 while ((line = in.readLine()) != null) { result += line; } }catch(Exception e) { throw new Exception("请求失败"); }finally { try { if (in != null) { in.close(); } } catch (Exception e2) { throw new Exception("请求失败"); } } return result; } /** * 发送POST请求 * * @param url 请求地址 * @param param 请求参数[格式:key1=value1&key2=value2 || JSON.toString()] * @return * @throws Exception */ public static String sendPostRequest(String url, String param) throws Exception { String result = ""; PrintWriter out = null; BufferedReader in = null; try { // 创建URL对象 URL realUrl = new URL(url); // 打开URL的链接 URLConnection conn = realUrl.openConnection(); // 设置Head信息 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); // POST请求设置 conn.setDoOutput(true); conn.setDoInput(true); // 获取输出流 out = new PrintWriter(conn.getOutputStream()); // 发送请求参数 out.print(param); // flush输出流的缓冲 out.flush(); // 获取输入流,读取响应请求 in = new BufferedReader(new InputStreamReader(conn.getInputStream())); // 临时参数 String line; // 获取响应结果 while ((line = in.readLine()) != null) { result += line; } }catch(Exception e) { throw new Exception("请求失败"); }finally { try { if (in != null) { in.close(); } } catch (Exception e2) { throw new Exception("请求失败"); } } return result; } public static void main(String[] args) throws Exception { System.out.println(sendPostRequest("http://www.baidu.com", "")); } }

所用到的微信工具类(下面的工具类，是我将微信sdk中的代码直接拷贝出来的，所以仅供参考)

import java.io.ByteArrayInputStream; import java.io.InputStream; import java.io.StringWriter; import java.util.*; import java.security.MessageDigest; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; 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 com.wxsdk.WXPayConstants.SignType; //import org.slf4j.Logger; //import org.slf4j.LoggerFactory; public class WXPayUtil { /** * 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>(); DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = documentBuilderFactory.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) { // WXPayUtil.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 { DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder(); org.w3c.dom.Document document = documentBuilder.newDocument(); org.w3c.dom.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(); org.w3c.dom.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; } /** * 生成带有 sign 的 XML 格式字符串 * * @param data Map类型数据 * @param key API密钥 * @return 含有sign字段的XML */ public static String generateSignedXml(final Map<String, String> data, String key) throws Exception { return generateSignedXml(data, key, SignType.MD5); } /** * 生成带有 sign 的 XML 格式字符串 * * @param data Map类型数据 * @param key API密钥 * @param signType 签名类型 * @return 含有sign字段的XML */ public static String generateSignedXml(final Map<String, String> data, String key, SignType signType) throws Exception { String sign = generateSignature(data, key, signType); data.put(WXPayConstants.FIELD_SIGN, sign); return mapToXml(data); } /** * 判断签名是否正确 * * @param xmlStr XML格式数据 * @param key API密钥 * @return 签名是否正确 * @throws Exception */ public static boolean isSignatureValid(String xmlStr, String key) throws Exception { Map<String, String> data = xmlToMap(xmlStr); if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) { return false; } String sign = data.get(WXPayConstants.FIELD_SIGN); return generateSignature(data, key).equals(sign); } /** * 判断签名是否正确，必须包含sign字段，否则返回false。使用MD5签名。 * * @param data Map类型数据 * @param key API密钥 * @return 签名是否正确 * @throws Exception */ public static boolean isSignatureValid(Map<String, String> data, String key) throws Exception { return isSignatureValid(data, key, SignType.MD5); } /** * 判断签名是否正确，必须包含sign字段，否则返回false。 * * @param data Map类型数据 * @param key API密钥 * @param signType 签名方式 * @return 签名是否正确 * @throws Exception */ public static boolean isSignatureValid(Map<String, String> data, String key, SignType signType) throws Exception { if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) { return false; } String sign = data.get(WXPayConstants.FIELD_SIGN); return generateSignature(data, key, signType).equals(sign); } /** * 生成签名 * * @param data 待签名数据 * @param key API密钥 * @return 签名 */ public static String generateSignature(final Map<String, String> data, String key) throws Exception { return generateSignature(data, key, SignType.MD5); } /** * 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。 * * @param data 待签名数据 * @param key API密钥 * @param signType 签名方式 * @return 签名 */ public static String generateSignature(final Map<String, String> data, String key, SignType signType) throws Exception { Set<String> keySet = data.keySet(); String[] keyArray = keySet.toArray(new String[keySet.size()]); Arrays.sort(keyArray); StringBuilder sb = new StringBuilder(); for (String k : keyArray) { if (k.equals(WXPayConstants.FIELD_SIGN)) { continue; } if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名 sb.append(k).append("=").append(data.get(k).trim()).append("&"); } sb.append("key=").append(key); if (SignType.MD5.equals(signType)) { return MD5(sb.toString()).toUpperCase(); } else if (SignType.HMACSHA256.equals(signType)) { return HMACSHA256(sb.toString(), key); } else { throw new Exception(String.format("Invalid sign_type: %s", signType)); } } /** * 获取随机字符串 Nonce Str * * @return String 随机字符串 */ public static String generateNonceStr() { return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32); } /** * 生成 MD5 * * @param data 待处理数据 * @return MD5结果 */ public static String MD5(String data) throws Exception { java.security.MessageDigest md = MessageDigest.getInstance("MD5"); byte[] array = md.digest(data.getBytes("UTF-8")); StringBuilder sb = new StringBuilder(); for (byte item : array) { sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3)); } return sb.toString().toUpperCase(); } /** * 生成 HMACSHA256 * @param data 待处理数据 * @param key 密钥 * @return 加密结果 * @throws Exception */ public static String HMACSHA256(String data, String key) throws Exception { Mac sha256_HMAC = Mac.getInstance("HmacSHA256"); SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256"); sha256_HMAC.init(secret_key); byte[] array = sha256_HMAC.doFinal(data.getBytes("UTF-8")); StringBuilder sb = new StringBuilder(); for (byte item : array) { sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3)); } return sb.toString().toUpperCase(); } /** * 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， 即用来标识一笔单，也用做 nonce_str * @return */ public static String generateUUID() { return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32); } } /** * 常量 */ public class WXPayConstants { public enum SignType { MD5, HMACSHA256 } public static final String DOMAIN_API = "api.mch.weixin.qq.com"; public static final String DOMAIN_API2 = "api2.mch.weixin.qq.com"; public static final String DOMAIN_APIHK = "apihk.mch.weixin.qq.com"; public static final String DOMAIN_APIUS = "apius.mch.weixin.qq.com"; public static final String FAIL = "FAIL"; public static final String SUCCESS = "SUCCESS"; public static final String HMACSHA256 = "HMAC-SHA256"; public static final String MD5 = "MD5"; public static final String FIELD_SIGN = "sign"; public static final String FIELD_SIGN_TYPE = "sign_type"; public static final String MICROPAY_URL_SUFFIX = "/pay/micropay"; public static final String UNIFIEDORDER_URL_SUFFIX = "/pay/unifiedorder"; public static final String ORDERQUERY_URL_SUFFIX = "/pay/orderquery"; public static final String REVERSE_URL_SUFFIX = "/secapi/pay/reverse"; public static final String CLOSEORDER_URL_SUFFIX = "/pay/closeorder"; public static final String REFUND_URL_SUFFIX = "/secapi/pay/refund"; public static final String REFUNDQUERY_URL_SUFFIX = "/pay/refundquery"; public static final String DOWNLOADBILL_URL_SUFFIX = "/pay/downloadbill"; public static final String REPORT_URL_SUFFIX = "/payitil/report"; public static final String SHORTURL_URL_SUFFIX = "/tools/shorturl"; public static final String AUTHCODETOOPENID_URL_SUFFIX = "/tools/authcodetoopenid"; // sandbox public static final String SANDBOX_MICROPAY_URL_SUFFIX = "/sandboxnew/pay/micropay"; public static final String SANDBOX_UNIFIEDORDER_URL_SUFFIX = "/sandboxnew/pay/unifiedorder"; public static final String SANDBOX_ORDERQUERY_URL_SUFFIX = "/sandboxnew/pay/orderquery"; public static final String SANDBOX_REVERSE_URL_SUFFIX = "/sandboxnew/secapi/pay/reverse"; public static final String SANDBOX_CLOSEORDER_URL_SUFFIX = "/sandboxnew/pay/closeorder"; public static final String SANDBOX_REFUND_URL_SUFFIX = "/sandboxnew/secapi/pay/refund"; public static final String SANDBOX_REFUNDQUERY_URL_SUFFIX = "/sandboxnew/pay/refundquery"; public static final String SANDBOX_DOWNLOADBILL_URL_SUFFIX = "/sandboxnew/pay/downloadbill"; public static final String SANDBOX_REPORT_URL_SUFFIX = "/sandboxnew/payitil/report"; public static final String SANDBOX_SHORTURL_URL_SUFFIX = "/sandboxnew/tools/shorturl"; public static final String SANDBOX_AUTHCODETOOPENID_URL_SUFFIX = "/sandboxnew/tools/authcodetoopenid"; }